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FEATURES
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LT3050 Series 100mA, Linear Regulator with Precision Current Limit and Diagnostic Outputs DESCRIPTION
The LT(R)3050 series are micro-power, low noise, low dropout voltage (LDO) linear regulators. The devices supply 100mA of output current with a dropout voltage of 340mV. A 10nF bypass capacitor reduces output noise to 30VRMS in a 10Hz to 100kHz bandwidth and soft-starts the reference. The LT3050's 45V input voltage rating combined with its precision current limit and diagnostic functions make the IC an ideal choice for robust, high reliability applications. A single resistor programs the LT3050's current limit, accurate to 5% over a wide input voltage and temperature range. A single resistor programs the LT3050's minimum output current monitor, useful for detecting open-circuit conditions. The current monitor function sources a current equal to 1/100th of output current. A logic FAULT pin asserts low if the LT3050 is in current limit, operating below its minimum output current (open-circuit) or is in thermal shutdown. The LT3050 optimizes stability and transient response with low ESR ceramic capacitors, requiring a minimum of 2.2F. The LT3050 is available in fixed output voltages of 3.3V and 5V, and as an adjustable version with an output voltage range down to the 0.6V reference.The LT3050 is available in the thermally-enhanced 12-Lead 3mm x 2mm DFN and MSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Output Current Monitor: 1/100th of IOUT Fault Indicator: Current Limit, Minimum IOUT or Thermal Limit Output Current: 100mA Dropout Voltage: 340mV Input Voltage Range: 1.6V to 45V Programmable Precision Current Limit: 5% Programmable Minimum IOUT Monitor Low Noise: 30VRMS (10Hz to 100kHz) Adjustable Output (VREF = VOUT(MIN) = 0.6V) Fixed Output Voltages: 3.3V, 5V Output Tolerance: 2% Over Line, Load and Temperature Stable with Low ESR, Ceramic Output Capacitors (2.2F minimum) Shutdown Current: <1A Reverse-Battery, Reverse-Output and Reverse-Current Protection Thermal Limit Protection 12-Lead 3mm x 2mm DFN and MSOP Packages
APPLICATIONS
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Protected Antenna Supplies Automotive Telematics Industrial Applications (Trucks, Forklifts, etc.) High Reliability Applications
TYPICAL APPLICATION
CURRENT LIMIT FAULT THRESHOLD (mA)
External Current Limit RIMAX = 1.15k
105 104 103 102 101 100 99 98 97 96 95 -75 -50 -25 0 -25 50 75 100 125 150 175 TEMPERATURE (C)
3050 TA01a
5V Supply with 100mA Precision Current Limit, 10mA IMIN
IN 12V VIN 1F 120k SHDN FAULT LT3050-5 IMAX 10nF 1.15k (THRESHOLD = 100mA) IMIN IMON 3k (ADC FULL SCALE = 3V) REF/BYP GND 10nF
3050 TA01
VOUT = 5V
OUT 2.2F
5V
VIN = 15V
VIN = 12V VIN = 5.6V
TO P ADC 0.1F
0.1F
11.3k (THRESHOLD = 10mA)
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LT3050 Series ABSOLUTE MAXIMUM RATINGS
(Note 1)
IN Pin Voltage ........................................................ 50V OUT Pin Voltage ..................................................... 50V Input-to-Output Differential Voltage ....................... 50V ADJ Pin Voltage (Note 16) ..................................... 50V REF/BYP Pin Voltage ........................................-0.3V, 1V SHDN Pin Voltage ...................................................50V IMON Pin Voltage ..............................................-0.3V, 7V IMIN Pin Voltage ...............................................-0.3V, 7V IMAX Pin Voltage...............................................-0.3V, 7V
FAULT Pin Voltage ..........................................-0.3V, 50V Output Short-Circuit Duration .......................... Indefinite Operating Junction Temperature Range (Notes 2, 3) E, I Grades .........................................-40C to 125C MP Grade...........................................-55C to 125C Storage Temperature Range...................-65C to 150C Lead Temperature: Soldering, 10 sec .................... 300C (MSOP Package Only)
PIN CONFIGURATION
TOP VIEW TOP VIEW REF/BYP IMIN FAULT SHDN IN IN 1 2 3 4 5 6 12 11 10 9 8 7 IMON IMAX GND ADJ OUT OUT REF/BYP 1 IMIN 2 FAULT 3 SHDN 4 IN 5 IN 6 MSE PACKAGE 12-LEAD PLASTIC MSOP TJMAX = 125C, JA = 45C/W, JC = 5C/W TO 10C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB 13 GND 12 IMON 11 IMAX 10 GND 9 ADJ 8 OUT 7 OUT
13 GND
DDB PACKAGE 12-LEAD (3mm 2mm) PLASTIC DFN TJMAX = 125C, JA = 49C/W, JC = 13.5C/W EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LT3050EMSE#PBF LT3050IMSE#PBF LT3050MPMSE#PBF LT3050EMSE-3.3#PBF LT3050IMSE-3.3#PBF LT3050EMSE-5#PBF LT3050IMSE-5#PBF LT3050MPMSE-5#PBF LT3050EDDB#PBF LT3050IDDB#PBF LT3050EDDB-3.3#PBF LT3050IDDB-3.3#PBF TAPE AND REEL LT3050EMSE#TRPBF LT3050IMSE#TRPBF LT3050MPMSE#TRPBF LT3050EMSE-3.3#TRPBF LT3050IMSE-3.3#TRPBF LT3050EMSE-5#TRPBF LT3050IMSE-5#TRPBF LT3050MPMSE-5#TRPBF LT3050EDDB#TRPBF LT3050IDDB#TRPBF LT3050EDDB-3.3#TRPBF LT3050IDDB-3.3#TRPBF PART MARKING* 3050 3050 3050 305033 305033 30505 30505 30505 LFGC LFGC LFWR LFWR PACKAGE DESCRIPTION 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN TEMPERATURE RANGE -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C
LT3050MPMSE-3.3#PBF LT3050MPMSE-3.3#TRPBF 305033
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LT3050 Series ORDER INFORMATION
LEAD FREE FINISH LT3050EDDB-5#PBF LT3050IDDB-5#PBF LEAD BASED FINISH LT3050EMSE LT3050IMSE LT3050MPMSE LT3050EMSE-3.3 LT3050IMSE-3.3 LT3050MPMSE-3.3 LT3050EMSE-5 LT3050IMSE-5 LT3050MPMSE-5 LT3050EDDB LT3050IDDB LT3050EDDB-3.3 LT3050IDDB-3.3 LT3050EDDB-5 LT3050IDDB-5 TAPE AND REEL LT3050EDDB-5#TRPBF LT3050IDDB-5#TRPBF TAPE AND REEL LT3050EMSE#TR LT3050IMSE#TR LT3050MPMSE#TR LT3050EMSE-3.3#TR LT3050IMSE-3.3#TR LT3050MPMSE-3.3#TR LT3050EMSE-5#TR LT3050IMSE-5#TR LT3050MPMSE-5#TR LT3050EDDB#TR LT3050IDDB#TR LT3050EDDB-3.3#TR LT3050IDDB-3.3#TR LT3050EDDB-5#TR LT3050IDDB-5#TR PART MARKING* LFWS LFWS PART MARKING* 3050 3050 3050 305033 305033 305033 30505 30505 30505 LFGC LFGC LFWR LFWR LFWS LFWS PACKAGE DESCRIPTION 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN PACKAGE DESCRIPTION 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead Plastic MSOP 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN 12-Lead (3mm x 2mm) Plastic DFN TEMPERATURE RANGE -40C to 125C -40C to 125C TEMPERATURE RANGE -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -55C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Input Voltage (Notes 3, 11) Regulated Output Voltage CONDITIONS ILOAD = 100mA
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 2)
MIN
l l l l l l l l l l
TYP 1.6 3.3 3.3 5 5 600 600 2.2 3.3 0.4 7.2 8.4 0.2
MAX 2.2 3.333 3.366 5.05 5.1 606 612 16.5 25 3 33 50 4
UNITS V V V V V mV mV mV mV mV mV mV mV
LT3050-3.3: VIN = 3.9V, ILOAD = 1mA 3.9V < VIN < 15V, 1mA < ILOAD < 100mA (Note 15) LT3050-5: VIN = 5.6V, ILOAD = 1mA 5.6V < VIN 15V, 1mA < ILOAD < 100mA (Note 15)
3.267 3.234 4.95 4.9 594 588
ADJ Pin Voltage (Notes 3, 4) Line Regulation (Note 3)
VIN = 2.2V, ILOAD = 1mA 2.2V < VIN < 15V, 1mA < ILOAD < 100mA (Note 15) LT3050-3.3: VIN = 3.9V to 45V, ILOAD = 1mA LT3050-5: VIN = 5.6V to 45V, ILOAD = 1mA LT3050: VIN = 2.2V to 45V, ILOAD = 1mA LT3050-3.3: VIN = 3.9V, ILOAD = 1mA to 100mA LT3050-5: VIN = 5.6V, ILOAD = 1mA to 100mA LT3050: VIN = 2.2V, ILOAD = 1mA to 100mA
Load Regulation (Note 3)
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LT3050 Series ELECTRICAL CHARACTERISTICS
PARAMETER Dropout Voltage VIN = VOUT(NOMINAL) (Notes 5, 6) CONDITIONS ILOAD = 1mA ILOAD = 1mA ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA ILOAD = 100mA ILOAD = 100mA GND Pin Current VIN = VOUT(NOMINAL) + 0.6V (Notes 6, 7, 11) ILOAD = 0mA ILOAD = 1mA ILOAD = 10mA ILOAD = 50mA ILOAD = 100mA VIN = 12V, VSHDN = 0V VIN = 12V COUT = 10F, ILOAD = 100mA, VOUT = 600mV, BW = 10Hz to 100kHz COUT = 10F, CBYP = 0.01F, ILOAD = 100mA, VOUT = 600mV BW = 10Hz to 100kHz VOUT = Off to On VOUT = On to Off VSHDN = 0V VSHDN = 45V VIN - VOUT = 2V, VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 100mA LT3050 LT3050-3.3 LT3050-5 VIN = 2.2V, FAULT Asserted, IFAULT = 100A FAULT = 5V, FAULT Not Asserted VIN = -45V, VOUT = 0 VOUT = 1.2V, VIN = 0 VIN = 2.2V or VOUT(NOMINAL) + 0.6V, VOUT = 0V, IMAX = 0V VIN = 2.2V or VOUT(NOMINAL) + 0.6V, VOUT = -5% LT3050-3.3 3.9V < VIN < 13.3V, RIMAX = 2.26k FAULT Pin Threshold (IFAULT ) 3.9V < VIN < 13.3V, RIMAX = 1.5k FAULT Pin Threshold (IFAULT ) 3.9V < VIN < 13.3V, RIMAX = 1.15k FAULT Pin Threshold (IFAULT ) LT3050, LT3050-5 5.6V < VIN < 15V, RIMAX = 2.26k FAULT Pin Threshold (IFAULT ) 5.6V < VIN < 15V, RIMAX = 1.5k FAULT Pin Threshold (IFAULT ) 5.6V < VIN < 15V, RIMAX = 1.15k FAULT Pin Threshold (IFAULT )
l l l l l l l l l l l l l l l l l
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 2)
MIN TYP 110 195 280 340 45 60 175 0.85 2.2 0.17 12.5 90 30 0.7 0.6 0.9 1.5 1 3 MAX 150 220 240 340 330 450 400 550 90 160 370 2 5.2 1 60 UNITS mV mV mV mV mV mV mV mV A A A mA mA A nA VRMS VRMS V V A A
Quiescent Current in Shutdown ADJ Pin Bias Current (Notes 3, 12) Output Voltage Noise Output Voltage Noise Shutdown Threshold SHDN Pin Current (Note 13) Ripple Rejection
0.3
70 55 51
85 70 66 140 0.01 0.2 240 250 1 300 10
dB dB dB mV A A A mA
FAULT Pin Logic Low Voltage FAULT Pin Leakage Current Input Reverse Leakage Current Reverse Output Current (Note 14) Internal Current Limit (Note 3) External Programmed Current Limit (Notes 6, 8)
110
l l l l l l
48.8 73.6 96 47.8 72.1 94.4
51.4 77.5 101 50.4 75.9 99.3
54 81.4 106 52.9 79.7 104.3
mA mA mA mA mA mA
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LT3050 Series ELECTRICAL CHARACTERISTICS
PARAMETER Minimum IMIN Threshold Accuracy (Notes 6, 9) IMIN Threshold Accuracy (Notes 6, 9) Current Monitor Ratio (Notes 6, 10) Ratio = IOUT/IMON CONDITIONS LT3050-3.3: 3.9V < VIN < 13.3V, RIMIN = 110K LT3050, LT3050-5: 5.6V < VIN < 15V, RIMIN = 110K LT3050-3.3: 3.9V < VIN < 13.3V, RIMIN = 11.3K LT3050, LT3050-5: 5.6V < VIN < 15V, RIMIN = 11.3K ILOAD = 5mA, 25mA, 50mA, 75mA, 100mA LT3050-3.3: VIMON = VOUT, 3.9V < VIN < 13.3V LT3050, LT3050-5: VIMON = VOUT, 5.6V < VIN < 15V
l l l l l l
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 2)
MIN 0.92 0.9 9.2 9 95 95 TYP 1.03 1 10.3 10 100 100 MAX 1.13 1.1 11.3 11 105 105 UNITS mA mA mA mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Absolute maximum input-to-output differential voltage is not achievable with all combinations of rated IN pin and OUT pin voltages. With the IN pin at 50V, the OUT pin may not be pulled below 0V. The total differential voltage from IN to OUT must not exceed 50V. Note 2: The LT3050 is tested and specified under pulse load conditions such that TJ ~ TA. The LT3050E is 100% production tested at TA = 25C. Performance at -40C and 125C is assured by design, characterization and correlation with statistical process controls. The LT3050I is guaranteed over the full -40C to 125C operating junction temperature range. The LT3050MP is 100% tested over the -55C to 125C operating junction temperature range. Note 3: The LT3050 adjustable version is tested and specified for these conditions with ADJ pin connected to the OUT pin. Note 4: Maximum junction temperature limits operating conditions. Regulated output voltage specifications do not apply for all possible combinations of input voltage and output current. If operating at the maximum input voltage, limit the output current range. If operating at the maximum output current, limit the input voltage range. Note 5: Dropout voltage is the minimum differential IN-to-OUT voltage needed to maintain regulation at a specified output current. In dropout, the output voltage equals (VIN - VDROPOUT). For some output voltages, minimum input voltage requirements limit dropout voltage. Note 6: To satisfy minimum input voltage requirements, the LT3050 adjustable version is tested and specified for these conditions with an external resistor divider (60k bottom, 440k top) which sets VOUT to 5V. The external resistor divider adds 10A of DC load on the output. This external current is not factored into GND pin current. Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.6V and a current source load. GND pin current increases in dropout. For the fixed output voltage versions, an internal resistor divider adds about
10A to GND pin current. See the GND Pin Current curves in the Typical Performance Characteristics section. Note 8: Current limit varies inversely with the external resistor value tied from the IMAX pin to GND. For detailed information on how to set the IMAX pin resistor value, please see the Operation section. If a programmed current limit is not needed, the IMAX pin must be tied to GND and internal protection circuitry implements short-circuit protection as specified. Note 9: The IMIN fault condition asserts if the output current falls below the IMIN threshold defined by an external resistor from the IMIN pin to GND. For detailed information on how to set the IMIN pin resistor value, please see the Operation section. IMIN settings below the Minimum IMIN Accuracy specification in the Electrical Characteristics section are not guaranteed to 10% tolerance. If the IMIN fault condition is not needed, the IMIN pin must be left floating (unconnected). Note 10: The current monitor ratio varies slightly when VIMON VOUT. For detailed information on how to calculate the output current from the IMON pin, please see the Operation section. If the current monitor function is not needed, the IMON pin must be tied to GND. Note 11: To satisfy requirements for minimum input voltage, current limit is tested at VIN = VOUT(NOMINAL) +1V or VIN = 2.2V, whichever is greater. Note 12: ADJ pin bias current flows out of the ADJ pin: Note 13: SHDN pin current flows into the SHDN pin. Note 14: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the specified voltage. This current flows into the OUT pin and out of the GND pin. Note 15: 100mA of output current does not apply to the full range of input voltage due to the internal current limit foldback. Note 16: The ADJ pin cannot be externally driven for fixed output voltage options. LTC allows the use of a small feedforward capacitor from OUT to ADJ to reduce noise and improve transient response. See the Bypass Capacitance section of the Applications Information.
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
600 550 500 DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) 450 400 350 300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA)
3050 G01
TJ = 25C, unless otherwise noted.
Guaranteed Dropout Voltage
600 550 500 DROPOUT VOLTAGE (mV) 450 400 350 300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA)
3050 G02
Dropout Voltage
600 550 500 IL = 100mA IL = 50mA 450 400 350 300 250 200 150 100 50 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G03
=TEST POINTS
TJ 125C
TJ = 125C
TJ = 25C
IL = 10mA
TJ 25C
IL = 1mA
Adjustable Quiescent Current
80 70 QUIESCENT CURRENT (A) ADJ PIN VOLTAGE (mV) 60 50 40 30 20 10 VIN = 12V ALL OTHER PINS = 0V VIN = VSHDN = 12V VOUT = 5V IL = 5A 612 610 608 604 602 600 598 596 594 592 590 606
ADJ Pin Voltage
3.366 ILOAD = 1mA 3.355 3.344 OUTPUT VOLTAGE (V) 3.333 3.322 3.311 3.300 3.289 3.278 3.267 3.256 3.245
Output Voltage LT3050-3.3
ILOAD = 1mA
0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G04
588 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G05
3.234 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G05a
Output Voltage LT3050-5
5.100 5.075 QUIESCENT CURRENT (A) OUTPUT VOLTAGE (V) 5.050 5.025 5.000 4.975 4.950 4.925 4.900 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G05b
Quiescent Current
100 90 80 70 60 50 40 30 20 10 0 0 5 VSHDN = 0V, RL = 0 10 15 20 25 VIN (V) 30 35 40 45 LT3050-3.3 LT3050-5 2.50 TJ = 25C ILOAD = 10A GND PIN CURRENT (mA) 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0
GND Pin Current LT3050-3.3
ILOAD = 1mA
RL = 33, IL = 100mA
RL = 66, IL = 50mA
RL = 3.3k, IL = 1mA RL = 330, IL = 10mA 0 1 2 3 4 5 6 7 8 9 10 11 12 INPUT VOLTAGE (V)
3050 G07a
3050 G06
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
GND Pin Current LT3050-5
2.50 2.25 2.00 GND PIN CURRENT (mA) 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 0 1 2 RL = 5k, IL = 1mA RL = 500, IL = 10mA 3 4 5 6 7 8 9 10 11 12 INPUT VOLTAGE (V)
3050 G07
TJ = 25C, unless otherwise noted.
GND Pin Current vs ILOAD
5.0 VIN = 5.6V 4.5 VOUT = 5V SHDN PIN THRESHOLD (V) GND PIN CURRENT (mA)
SHDN Pin Threshold
1.5 1.4 IL = 1mA 1.3 1.2 1.1 1.0 0.9 0.8 0.7 OFF TO ON 0.6 ON TO OFF 0.5 0.4 0.3 0.2 0.1 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G09
RL = 50, IL = 100mA
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 20 30 40 50 60 70 80 90 100 ILOAD (mA)
3050 G08
RL = 100, IL = 50mA
SHDN Pin Input Current
3.0 SHDN PIN INPUT CURRENT (A) 2.5 2.0 1.5 1.0 0.5 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G10
SHDN Pin Input Current
2.0 1.8 SHDN PIN INPUT CURRENT (A) ADJ PIN BIAS CURRENT (nA) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 10 20 30 40 SHDN PIN VOLTAGE (V) 50
3050 G11
ADJ Pin Bias Current
50 45 40 35 30 25 20 15 10 5 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G12
VSHDN = 45V
Internal Current Limit
350 300 CURRENT LIMIT (mA) 250 200 150 100 50 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G13
Internal Current Limit
250 225 200 CURRENT LIMIT (mA) 175 150 125 100 75 50 25 0 0 5 TJ = 125C TJ = 25C TJ = -40C TJ = -55C CURRENT LIMIT AT FAULT THRESHOLD 45 CURRENT LIMIT (mA) 225 200 175 150 125 100 75 50 25 0
Internal Current Limit vs Output Voltage
VIN - VOUT(NOMINAL) = 1V
VIN = 12V VOUT = 0V
TJ = 125C TJ = 25C TJ = -40C TJ = -55C 0 5 10
CURRENT LIMIT AT FAULT THRESHOLD 40 45
10 15 20 25 30 35 40 INPUT/OUTPUT DIFFERENTIAL (V)
15 20 25 30 35 OUTPUT VOLTAGE (V)
3050 G14
3050 G15
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Output Current
1.0 0.9 0.8 0.7 CURRENT(A) IOUT (A) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 10 20 30 VOUT (V) 40 50
3050 G16
TJ = 25C, unless otherwise noted.
Reverse Output Current
50 VOUT = VADJ = 1.2V 45 VIN = 0 40 35 30 25 20 15 10 5 IADJ RIPPLE REJECTION (dB) 90 80 70 60 50 40 30
Input Ripple Rejection
CREF/BYP = 10nF CREF/BYP = 100pF CREF/BYP = 0
ALL PINS GROUNDED EXCEPT FOR OUT
IOUT 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G17
20 IL = 100mA COUT = 10F 10 VOUT = 5V VIN = 5.8V + 50mVRMS RIPPLE 0 10 100 1K 10K 100K FREQUENCY (Hz)
1M
10M
3050 G18
Input Ripple Rejection
90 80 INPUT RIPPLE REJECTION (dB) 70 60 50 40 30 20 IL = 100mA CREF/BYP = 100pF 10 VOUT = 5V VIN = 5.8V + 50mVRMS RIPPLE 0 10 100 1K 10K 100K FREQUENCY (Hz) COUT = 10F COUT = 2.2F RIPPLE REJECTION (dB) 100 90 80 70 60 50 40 30 20 10 1M 10M
3050 G19
Ripple Rejection vs Temperature
COUT = 10F CREF/BYP = 10nF MINIMUM INPUT VOLTAGE (V) 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
Minimum Input Voltage
IL =100mA
IL = 100mA VOUT = 5V VIN = 5.8V + 0.5VP-P RIPPLE AT f = 120Hz
0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G19a
0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G20
Load Regulation
4 IL = 1mA TO 100mA 3 VOUT = 0.6V VIN = 2.2V LOAD REGULATION (mV) 2 1 0 -1 -2 -3 -4 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G21
Load Regulation
-0 -3 -6 LOAD REGULATION (mV) -9 -12 -15 -18 -21 -24 -27 I = 1mA TO 100mA L -30 VOUT = 3.3V VIN = 3.9V -33 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G21a
Load Regulation
-0 -5 -10 LOAD REGULATION (mV) -15 -20 -25 -30 -35 -40 IL = 1mA TO 100mA -45 VOUT = 5V VIN = 5.6V -50 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G21b
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
Output Noise Spectral Density CREF/BYP = 0, CFF = 0
OUTPUT NOISE SPECTRAL DENSITY (V/Hz) OUTPUT NOISE SPECTRAL DENSITY (V/Hz) 10 10 VOUT = 5V
TJ = 25C, unless otherwise noted. Output Noise Spectral Density vs CFF, CREF/BYP = 10nF
OUTPUT NOISE SPECTRAL DENSITY (V/Hz) 10
Output Noise Spectral Density vs CREF/BYP, CFF = 0
CREF/BYP = 100pF
1
1 VOUT = 0.6V
1 CFF = 10nF
CFF = 0
0.1
0.01
VOUT = 5V VOUT = 3.3V VOUT = 2.5V VOUT = 1.8V VOUT = 1.5V VOUT = 1.2V VOUT = 0.6V 10 100
0.1 CREF/BYP = 10nF COUT = 10F IL = 100mA 10 100 CREF/BYP = 1nF
0.1 VOUT = 5V COUT = 10F IL = 100mA 10 100 CFF = 1nF
COUT = 10F IL = 100mA 100k
3050 G22
CFF = 100pF 100k
3050 G23a
0.01
1K 10K FREQUENCY (Hz)
1k 10k FREQUENCY (Hz)
100k
3050 G23
0.01
1k 10k FREQUENCY (Hz)
RMS Output Noise vs Load Current vs CREF/BYP
110 OUTPUT NOISE VOLTAGE (VRMS) OUTPUT NOISE VOLTAGE (VRMS) VOUT = 0.6V 100 COUT = 10F 90 80 70 60 50 40 30 20 10 0 0.01 CREF/BYP = 1nF CREF/BYP = 10nF CREF/BYP = 100nF 0.1 1 10 LOAD CURRENT (mA) 100
3050 G24
RMS Output Noise vs Load Current CREF/BYP = 10nF
170 160 fOUT = 10Hz TO 100kHz VOUT = 5V 150 COUT = 10F 140 VOUT = 2.5V 130 VOUT = 3.3V 120 VOUT = 1.8V 110 100 VOUT = 1.5V 90 80 70 60 50 40 VOUT = 1.2V 30 20 VOUT = 0.6V 10 0 0.01 0.1 1 10 100 LOAD CURRENT (mA)
3050 G25
RMS Output Noise vs Feedforward Capacitor (CFF)
120 110 OUTPUT NOISE VOLTAGE (VRMS) 100 90 80 70 60 50 40 30 20 VOUT = 1.8V VOUT = 1.2V VOUT = 0.6V 10 VOUT = 1.5V 0 1n 10n 10p 100p FEEDFORWARD CAPACITOR, CFF (F)
3050 G25a
CREF/BYP = 0 CREF/BYP = 10pF
VOUT = 5V VOUT = 3.3V VOUT = 2.5V
f = 10Hz TO 100kHz CREF/BYP = 10nF COUT = 10F IFB-DIVIDER = 5A IL = 100mA
CREF/BYP = 100pF
Startup Time vs REF/BYP Capacitor
60 50 STARTUP TIME (ms) 40 30 20 10 0 VOUT 100V/DIV
5V 10Hz to 100kHz Output Noise CREF/BYP = 10nF, CFF = 0
5V 10Hz to 100kHz Output Noise CREF/BYP = 10nF, CFF = 10nF
VOUT 100V/DIV
COUT = 10F ILOAD = 100mA 0 10 20 30 40 50 60 70 80 90 100 REF/BYP CAPACITOR (nF)
3050 G33
1ms/DIV
3050 G27
COUT = 10F ILOAD = 100mA
1ms/DIV
3050 G26
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
5V Transient Response CFF = 0, IOUT = 10mA to 100mA TJ = 25C, unless otherwise noted.
5V Transient Response CFF = 10nF, IOUT = 10mA to 100mA
VOUT 20mV/DIV
Transient Response (Load Dump)
VOUT = 5V 50mV/DIV
VOUT = 5V 20mV/DIV
45V
IOUT 50mA/DIV
IOUT 50mA/DIV
VIN 10V/DIV 100s/DIV VIN = 6V COUT = CIN = 10F IFB-DIVIDER = 10A
3050 G28b
VOUT = 5V IOUT = 50mA COUT = 2.2F 1ms/DIV
3050 G29
12V
100s/DIV VIN = 6V COUT = CIN = 10F IFB-DIVIDER = 10A
3050 G28a
SHDN Transient Response CREF/BYP =0
OUT 5V/DIV IL=100mA REF/BYP 500mV/DIV OUT 5V/DIV IL = 100mA REF/BYP 500mV/DIV
SHDN Transient Response CREF/BYP = 10nF
CURRENT LIMIT FAULT THRESHOLD (mA) 54.0 53.6 53.2 52.8 52.4 52.0 51.6 51.2 50.8 50.4 50.0 49.6 49.2
External Current Limit RIMAX = 2.26k
VOUT = 3.3V
VIN = 13.3V
VIN = 3.9V
SHDN 1V/DIV 2ms/DIV
3050 G30
SHDN 1V/DIV 2ms/DIV
3050 G31
48.8 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G34a
External Current Limit RIMAX = 1.5k
81.10 CURRENT LIMIT FAULT THRESHOLD (mA) 80.35 79.60 78.85 78.10 77.35 76.60 75.85 75.10 74.35 73.60 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G35a
External Current Limit RIMAX = 1.15k
106 CURRENT LIMIT FAULT THRESHOLD (mA) 105 104 103 102 101 100 99 98 97 96 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G36a
External Current Limit RIMAX = 2.26k
52.8 CURRENT LIMIT FAULT THRESHOLD (mA) 52.3 51.8 51.3 50.8 50.3 49.8 49.3 48.8 48.3 47.8 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G34
VOUT = 3.3V VIN = 13.3V
VOUT = 3.3V VIN = 13.3V
VOUT = 5V
VIN = 15V
VIN = 3.9V
VIN = 3.9V
VIN = 12V VIN = 5.6V
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
External Current Limit RIMAX = 1.5k
79.50 CURRENT LIMIT FAULT THRESHOLD (mA) 78.75 78.00 77.25 76.50 75.75 75.00 74.25 73.50 72.75 72.00 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G35
TJ = 25C, unless otherwise noted. Minimum Output Current Threshold RIMIN = 11.3k
MINIMUM OUTPUT CURRENT THRESHOLD (mA) 11.3 11.0 10.7 VIN = 13.3V 10.4 10.1 9.8 9.5 9.2 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G38a
External Current Limit RIMAX = 1.15k
105 CURRENT LIMIT FAULT THRESHOLD (mA) 104 103 102 101 100 99 98 97 96 95 -75 -50 -25 0 -25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G36
VOUT = 5V
VOUT = 5V
VOUT = 3.3V
VIN = 15V
VIN = 15V
VIN = 12V VIN = 5.6V
VIN = 12V VIN = 5.6V
VIN = 3.9V
Minimum Output Current Threshold RIMIN = 110k
MINIMUM OUTPUT CURRENT THRESHOLD (mA) MINIMUM OUTPUT CURRENT THRESHOLD (mA) 1.13 1.10 1.07 VIN = 13.3V 1.04 1.01 0.98 0.95 0.92 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G37a
Minimum Output Current Threshold RIMIN = 11.3k
MINIMUM OUTPUT CURRENT THRESHOLD (mA) 11.00 10.75 10.50 10.25 10.00 9.75 9.50 9.25 9.00 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G38
Minimum Output Current Threshold RIMIN = 110k
1.100 1.075 1.050 1.025 1.000 0.975 0.950 0.925 0.900 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3050 G37
VOUT = 3.3V
VOUT = 5V
VOUT = 5V
VIN = 15V VIN = 12V VIN = 5.6V
VIN = 15V VIN = 12V VIN = 5.6V
VIN = 3.9V
IOUT/IMON Current Ratio VOUT = 3.3V, VIN = 12V
103 102 IOUT/IMON CURRENT RATIO IOUT/IMON CURRENT RATIO 101 100 99 98 97 96 95 94 93 0 25 50 75 IOUT (mA) VIMON = 0V VIMON = 1V VIMON = 2V VIMON = 3.3V 100 125
3050 G39a
IOUT/IMON Current Ratio VOUT = 3.3V, VIN = 3.9V
102 101 IOUT/IMON CURRENT RATIO 100 99 98 97 96 95 94 93 92 0 25 50 75 IOUT (mA) VIMON = 0V VIMON = 1V VIMON = 2V VIMON = 3.3V 100 125
3050 G40a
IOUT/IMON Current Ratio VOUT = 3.3V, VIN = 3.9V
102 101 100 99 98 97 96 95 94 93 92 0 25 50 75 IOUT (mA) 100 125C 25C -55C 125
3050 G41a
VIMON = 3.3V
VIMON = 0V
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LT3050 Series TYPICAL PERFORMANCE CHARACTERISTICS
IOUT/IMON Current Ratio VOUT = 3.3V, VIN = 12V
103 102 IOUT/IMON CURRENT RATIO 101 100 99 98 97 96 95 94 93 0 25 50 75 IOUT (mA) 100 125C 25C -55C 125
3050 G42a
TJ = 25C, unless otherwise noted. IOUT/IMON Current Ratio VOUT = 5, VIN = 5.6V
102 101 IOUT/IMON CURRENT RATIO 100 99 98 97 96 95 94 93 92 0 25 VIMON = 4V VIMON = 3V VIMON = 2V VIMON = 1V VIMON = 0V VIMON = 5V
IOUT/IMON Current Ratio VOUT = 5V, VIN = 12V
102 101 IOUT/IMON CURRENT RATIO 100 99 98 97 96 95 94 93 92 0 25 50 75 IOUT (mA) VIMON = 5V VIMON = 4V VIMON = 3V VIMON = 2V VIMON = 1V VIMON = 0V 100 125
3050 G39
VIMON = 3.3V
VIMON = 0V
50 75 IOUT (mA)
100
125
3050 G40
IOUT/IMON Current Ratio VOUT = 5V, VIN = 5.6V
102 100 IOUT/IMON CURRENT RATIO IOUT/IMON CURRENT RATIO 99 98 97 96 95 94 93 92 91 0 25 50 75 IOUT (mA) 100 125
3050 G41
IOUT/IMON Current Ratio VOUT = 5V, VIN = 12V
103 102 %ERROR OF CALCULATION VIMON = 5V 125C 25C -55C VIMON = 0V 5
IOUT Calculated From IMON VOUT = 5V
4 IOUT = IMONR * VIMON * 70 + VIN - VOUT RIMON 70 + VIN - VOUT 3 (SEE OPERATION SECTION FOR DETAILS) 2 1 0 -1 -2 -3 -4 VIN=5.6V, RIMON=1k VIN=5.6V, RIMON=2k VIN=5.6V, RIMON=3k VIN=12V, RIMON=1k VIN=12V, RIMON=2k VIN=12V, RIMON=3k 0 25 50 75 IOUT (mA) 100 125
3050 G43
VIMON = 5V
101 100 9 98 97 96 95 94 93 0 25
125C 25C -55C VIMON = 0V
50 75 IOUT (mA)
100
125
3050 G42
-5
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LT3050 Series PIN FUNCTIONS
REF/BYP (Pin 1): Bypass/Soft-Start. Connecting a single capacitor from this pin to GND bypasses the LT3050's reference noise and soft-starts the reference. A 10nF bypass capacitor typically reduces output voltage noise to 30VRMS in a 10Hz to 100kHz bandwidth. Soft-start time is directly proportional to the REF/BYP capacitor value. If the LT3050 is placed in shutdown, REF/BYP is actively pulled low by an internal device to reset soft-start. If low noise or soft-start performance is not required, this pin must be left floating (unconnected). Do not drive this pin with any active circuitry. Because the REF/BYP pin is the reference input to the error amplifier, stray capacitance at this point should be minimized. Special attention should be given to any stray capacitances that can couple external signals onto the REF/BYP pin producing undesirable output transients or ripple. A minimum REF/BYP capacitance of 100pF is recommended. IMIN (Pin 2): Minimum Output Current Programming Pin. This pin is the collector of a PNP current mirror that outputs 1/200th of the power PNP load current. This pin is also the input to the minimum output current fault comparator. Connecting a resistor between IMIN and GND sets the minimum output current fault threshold. For detailed information on how to set the IMIN pin resistor value, please see the Operation section. A small external decoupling capacitor (10nF minimum) is required to improve IMIN PSRR. If minimum output current programming is not required, the IMIN pin must be left floating (unconnected). FAULT (Pin 3): Fault Pin. This is an open collector logic pin which asserts during current limit, thermal limit or a minimum current fault condition. The maximum low logic output level is defined for sinking 100A of current. Off state logic may be as high as 45V without damaging internal circuitry regardless of the VIN used. SHDN (Pin 4): Shutdown. Pulling the SHDN pin low puts the LT3050 into a low power state and turns the output off. Drive the SHDN pin with either logic or an open collector/drain with a pull-up resistor. The resistor supplies the pull-up current to the open collector/drain logic, normally several microamperes, and the SHDN pin current, typically less than 2A. If unused, connect the SHDN pin to IN. The LT3050 does not function if the SHDN pin is not connected. The SHDN pin cannot be driven below GND unless tied to the IN pin. If the SHDN pin is driven below GND while IN is powered, the output may turn on. SHDN pin logic cannot be referenced to a negative rail. IN (Pin 5,6): Input. These pins supply power to the device. The LT3050 requires a local IN bypass capacitor if it is located more than six inches from the main input filter capacitor. In general, battery output impedance rises with frequency, so adding a bypass capacitor in battery powered circuits is advisable. A minimum input of 1F generally suffices. OUT (Pin 7,8): Output. These pins supply power to the load. Stability requirements demand a minimum 2.2F ceramic output capacitor to prevent oscillations. Large load transient applications require larger output capacitors to limit peak voltage transients. See the Applications Information section for details on transient response and reverse output characteristics. Permissible output voltage range for the adjustable voltage version is 600mV to 44.5V. The top of the resistor divider setting output voltage in the fixed 3.3V and 5V versions connects directly to OUT on the IC. ADJ (Pin 9): Adjust. This pin is the error amplifier's inverting terminal. Its typical bias of 16nA current flows out of the pin (see curve of ADJ Pin Bias Current vs. Temperature in the Typical Performance Characteristics section). The typical ADJ pin voltage is 600mV referenced to GND. GND (PIN 10, Exposed Pad Pin 13): Ground. The exposed pad of the DFN and MSOP packages is an electrical connection to GND. To ensure proper electrical and thermal performance, solder Pin 13 to the PCB ground and tie directly to Pin 10. Connect the bottom of the output voltage setting resistor divider directly to GND (Pin 10) for optimum load regulation performance. IMAX (Pin 11): Precision Current Limit Programming Pin. This pin is the collector of a current mirror PNP that is 1/200th the size of the output power PNP. This pin is also the input to the current limit amplifier. Current limit threshold is set by connecting a resistor between the IMAX pin and GND.
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LT3050 Series PIN FUNCTIONS
For detailed information on how to set the IMAX pin resistor value, please see the Operation section. The IMAX pin requires a 10nF decoupling capacitor to ground. If not used, tie IMAX to GND. IMON (Pin 12): Output Current Monitor. This pin is the collector of a PNP current mirror that outputs 1/100th of the power PNP current. When OUT = IMON, the pin current exactly equals 1/100th that of the output current. For detailed information on how to calculate the output current from the IMON pin, please see the Operation section. The IMON pin requires a small (22nF minimum) external decoupling capacitor. If the IMON pin is not used, it must be tied to GND.
BLOCK DIAGRAM
IN 5, 6
R1 OUT R2 ADJ 30k R4 Q2 R1 D2 IDEAL DIODE D3 THERMAL/ CURRENT LIMITS
D1 QIMIN 1/200 QIMON 1/100 QIMAX 1/200 QPOWER 1 OUT 7, 8 100k R3 IMAX IMON
9
ERROR AMPLIFIER
4
SHDN
+ -
600mV REFERENCE
FIXED VOUT 3.3V 5V
R1 60k 60k
R2 270k 440k
14
+ -
1 REF/BYP
Q3
CURRENT LIMIT AMPLIFIER
+ -
IMIN COMPARATOR
11 12
+ -
100k R2
IMIN FAULT U1 QFAULT
2 3
GND 10, 13
3050 BD01
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LT3050 Series OPERATION
IMON Pin Operation (Current Monitor) The IMON pin is the collector of a PNP which mirrors the LT3050 output PNP at a ratio of 1:100 (see block diagram on page 11). The current sourced by the IMON pin is ~1/100th of the current sourced by the OUT pin when the IMON and OUT pin voltages are equal and the device is not operating in dropout. If the IMON and OUT pin voltages are not the same, the ratio deviates from 1/100 due to the Early voltages of the IMON and OUT PNPs according to the equation: IIMON IOUT 1 IMONR 70 VIN VIMON A small decoupling capacitor (22nF minimum) from IMON to GND is required to improve IMON pin power supply rejection. If the current monitor is not needed, it must be tied to GND. Open Circuit Detection (IMIN Pin) The IMIN pin is the collector of a PNP which mirrors the LT3050 output at a ratio of approximately 1:200 (see block diagram on page 11). The IMIN fault comparator asserts the FAULT pin if the IMIN pin voltage is below 0.6V. This low output current fault threshold voltage (IOPEN) is set by attaching a resistor from IMIN to GND. RIMIN = 119.85 - (1.68 - 36.8 * IOPEN ) * VOUT IOPEN
Early Voltage Compensation
70 V V 144 IN 444 4 2 OUT3
where the Early voltage of the PNPs is 70V and IMONR is a variable which represents the IOUT to IMON current ratio. IMONR varies with VIN to VOUT voltage according to the empirically derived equation: IMONR = 97 + 5 * log10 (1+VIN - VOUT) for (VIN - VOUT) 0.5 IMONR = 96 + 2 * (VIN - VOUT) for (VIN - VOUT) < 0.5 The IMON pin current can be converted into a voltage for use by monitoring circuitry simply by connecting the IMON pin to a resistor. Connecting a resistor from IMON to GND converts the IMON pin current into a voltage that can be monitored by circuitry such as an ADC. For example, a 1.2k resistor results in a IMON pin voltage of 1.2V for an output current of 100mA and an output voltage of 1.2V. The output current of the device can be calculated from the IMON pin voltage by the following equation: IOUT IMONR { VIMON RIMON 13 2
IIMON
This equation is empirically derived and partially compensates for early voltage effects in the IMIN current mirror. It is valid for an input voltage range from 0.6V above the output to 10V above the output. It is valid for output voltages up to 12V. The accuracy of this equation for setting the resistor value is approximately 2%. Unit values are Amps, Volts, and Ohms. If the open circuit detection function is not needed, the IMIN pin must be left floating (unconnected). A small decoupling capacitor (10nF minimum) from IMIN to GND is required to improve IMIN pin power supply rejection and to prevent FAULT pin glitches. See the Typical Performance Characteristics section for additional information.
70 VIN
VOUT
IOUT Ratio IMON
Early VoltageCompensation
70 V V 144IN 444 4 2 IMON 3
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LT3050 Series OPERATION
External Programmable Current Limit (IMAX Pin) The IMAX pin is the collector of a PNP which mirrors the LT3050 output at a ratio of approximately 1:200 (see Block Diagram). The IMAX pin is also the input to the precision current limit amplifier. If the output load increases to the point where it causes the IMAX pin voltage to reach 0.6V, the current limit amplifier takes control of output regulation so that the IMAX pin clamps at 0.6V, regardless of the output voltage. The current limit threshold (ILIMIT) is set by attaching a resistor (RIMAX) from IMAX to GND: RIMAX = 119.22 - 0.894 * VOUT ILIMIT See the Typical Performance Characteristics section for additional information. FAULT Pin Operation The FAULT pin is an open collector logic pin which asserts during internal current limit, precision current limit, thermal limit, or a minimum current fault. There is no internal pull-up on the FAULT pin; an external pull-up resistor is required. The FAULT pin provides drive for up to 100A of pull-down current. Off state logic may be as high as 45V, regardless of the input voltage used. When asserted, the FAULT pin drive circuitry adds 50A (nominal) of GND pin current. Depending on the IMIN capacitance, BYP capacitance, and OUT capacitance, the FAULT pin may assert during startup. Consideration should be given to masking the FAULT signal during startup. The FAULT pin circuitry is inactive (not asserted) during shutdown and when the OUT pin is pulled above the IN pin. Operation in Dropout The LT3050 contains circuitry which prevents the PNP output power device from saturating in dropout. This also keeps the IMON, IMIN, and IMAX current mirrors functioning accurately, even in dropout. However, this anti-saturation circuitry becomes less active at lower output currents, so there is some degradation of current mirror function for output currents less than 10mA.
This equation is empirically derived and partially compensates for early voltage effects in the IMAX current mirror. It is valid for an input voltage range from 0.6V above the output to 10V above the output. It is valid for output voltages up to 12V. The accuracy of this equation for setting the resistor value is approximately 1%. Unit values are Amps, Volts, and Ohms. In cases where the IN to OUT voltage exceeds 10V, foldback current limit will lower the internal current level limit, possibly causing it to preempt the external programmable current limit. See the Internal Current Limit vs VIN - VOUT graph in the Typical Performance Characteristics section. If the external programmable current limit is not needed, the IMAX pin must be connected to GND. The IMAX pin requires a 10nF decoupling capacitor.
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LT3050 Series APPLICATIONS INFORMATION
The LT3050 is a micropower, low noise and low dropout voltage, 100mA linear regulator with micropower shutdown, programmable current limit, and diagnostic functions. The device supplies up to 100mA at a typical dropout voltage of 340mV and operates over a 2.2V to 45V input range. A single external capacitor can provide low noise reference performance and output soft-start functionality. For example, connecting a 10nF capacitor from the REF/BYP pin to GND lowers output noise to 30VRMS over a 10Hz to 100kHz bandwidth. This capacitor also soft-starts the reference and prevents output voltage overshoot at turn-on. The LT3050's quiescent current is merely 45A but provides fast transient response with a minimum low ESR 2.2F ceramic output capacitor. In shutdown, quiescent current is less than 1A and the reference soft-start capacitor is reset. The LT3050 optimizes stability and transient response with low ESR, ceramic output capacitors. The regulator does not require the addition of ESR as is common with other regulators. The LT3050 typically provides 0.1% line regulation and 0.1% load regulation. Internal protection circuitry includes reverse-battery protection, reverseoutput protection, reverse-current protection, current limit with fold-back and thermal shutdown. This "bullet-proof" protection set makes it ideal for use in battery-powered, automotive and industrial systems. In battery backup applications where the output is held up by a backup battery and the input is pulled to ground, the LT3050 acts like it has a diode in series with its output and prevents reverse current flow. Adjustable Operation The adjustable LT3050 has an output voltage range of 0.6V to 44.5V. The output voltage is set by the ratio of two external resistors, as shown in Figure 1. The device servos the output to maintain the ADJ pin voltage at 0.6V referenced to ground. The current in R1 is then equal to 0.6V/R1, and the current in R2 is the current in R1 minus the ADJ pin bias current.
IN VIN OUT LT3050 SHDN ADJ R1
3050 F01
VOUT R2
GND
VOUT = 0.6V 1+ VADJ = 0.6V
R2 - (IADJ ) * R2 R1
IADJ = 16nA at 25C OUTPUT RANGE = 0.6V to 44.5V
Figure 1. Adjustable Operation
The ADJ pin bias current, 16nA at 25C, flows from the ADJ pin through R1 to GND. Calculate the output voltage using the formula in Figure 1. The value of R1 should be no greater than 124k to provide a minimum 5A load current so that output voltage errors, caused by the ADJ pin bias current, are minimized. Note that in shutdown, the output is turned off and the divider current is zero. Curves of ADJ Pin Voltage vs Temperature and ADJ Pin Bias Current vs Temperature appear in the Typical Performance Characteristics Section. The LT3050 is tested and specified with the ADJ pin tied to the OUT pin, yielding VOUT = 0.6V. Specifications for output voltages greater than 0.6V are proportional to the ratio of the desired output voltage to 0.6V: VOUT/0.6V. For example, load regulation for an output current change of 1mA to 100mA is -0.2mV (typical) at VOUT = 0.6V. at VOUT = 12V, load regulation is: 12V * ( -0.2mV ) = - 4mV 0.6 V
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LT3050 Series APPLICATIONS INFORMATION
Table 1 shows 1% resistor divider values for some common output voltages with a resistor divider current of 5A.
Table 1. Output Voltage Resistor Divider Valves
VOUT (V) 1.2 1.5 1.8 2.5 3 3.3 5 R1 (k) 118 121 124 115 124 124 115 R2 (k) 118 182 249 365 499 562 845
Using a feedforward capacitor (CFF) from VOUT to the ADJ pin has the added benefit of improving transient response for output voltages greater than 0.6V. With no feedforward capacitor, the settling time will increase as the output voltage is raised above 0.6V. Use the equation in Figure 2 to determine the minimum value of CFF to achieve a transient response that is similar to 0.6V output voltage performance regardless of the chosen output voltage (See Figure 3 and Transient Response in the Typical Performance Characteristics section). During start-up, the internal reference will soft-start if a reference bypass capacitor is present. Regulator startup time is directly proportional to the size of the bypass capacitor, slowing to 6ms with a 10nF bypass capacitor (See Start-up Time vs REF/BYP Capacitor in the Typical Performance Characteristics section). The reference bypass capacitor is actively pulled low during shutdown to reset the internal reference.
Bypass Capacitance, Output Voltage Noise and Transient Response The LT3050 regulator provides low output voltage noise over the 10Hz to 100kHz bandwidth while operating at full load with the addition of a reference bypass capacitor (CREF/BYP) from the REF/BYP pin to GND. A good quality, low leakage capacitor is recommended. This capacitor will bypass the internal reference of the regulator, providing a low frequency noise pole. With the use of 10nF for CREF/BYP, the output voltage noise decreases to as low as 30VRMS when the output voltage is set for 0.6V. For higher output voltages (generated by using a feedback resistor divider), the output voltage noise gains up accordingly when using CREF/BYP by itself. To lower the output voltage noise for higher output voltages, include a feedforward capacitor (CFF) from VOUT to the ADJ pin. A good quality, low leakage capacitor is recommended. This capacitor will bypass the error amplifier of the regulator, providing a low frequency noise pole. With the use of 10nF for both CFF and CREF/BYP, output voltage noise decreases to 30VRMS when the output voltage is set to 5V by a 5A feedback resistor divider. If the current in the feedback resistor divider is doubled, CFF must also be doubled to achieve equivalent noise performance. Higher values of output voltage noise are often measured if care is not exercised with regard to circuit layout and testing. Crosstalk from nearby traces induces unwanted noise onto the LT3050's output. Power supply ripple rejection must also be considered. The LT3050 regulator does not have unlimited power supply rejection and passes a small portion of the input noise through to the output.
IN VIN
OUT LT3050-5 CFF
VOUT COUT
SHDN
ADJ CFF CREF/BYP IFB
3050 F02
GND REF/BYP
10nF *I 10A FB DIVIDER VOUT 10A FOR FIXED VOUT DIVIDER = R1+R2
(
)
(
)
Figure 2. Feedforward Capacitor for Fast Transient Response
FEEDFORWARD CAPACITOR, CFF
0
VOUT = 5V COUT = 10F IFB-DIVIDER = 10A VOUT 50mV/DIV
100pF 1nF 10nF
LOAD CURRENT 100mA/DIV 100s/DIV
3050 F03
Figure 3. Transient Response vs Feedforward Capacitor
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LT3050 Series APPLICATIONS INFORMATION
Start-up time is also affected by the presence of a feedforward capacitor. Start-up time is directly proportional to the size of the feedforward capacitor and the output voltage, and is inversely proportional to the feedback resistor divider current, slowing to 15ms with a 4.7nF feedforward capacitor and a 10F output capacitor for an output voltage set to 5V by a 5A feedback resistor divider. Output Capacitance The LT3050 regulator is stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. Use a minimum output capacitor of 2.2F with an ESR of 3 or less to prevent oscillations. If a feedforward capacitor is used with output voltages set for greater than 24V, use a minimum output capacitor of 4.7F. The LT3050 is a micropower device and output load transient response is a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT3050, increase the effective output capacitor value. For applications with large load current transients, a low ESR ceramic capacitor in parallel with a bulk tantalum capacitor often provides an optimally damped response.
20 0 CHANGE IN VALUE (%) X5R -20 CHANGE IN VALUE (%) 0 -20 -40 -60 -80 0 2 4 8 6 10 12 DC BIAS VOLTAGE (V) 14 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F 50 25 75 0 TEMPERATURE (C) 100 125 Y5V X5R -40 -60 Y5V -80 -100
Give extra consideration to the use of ceramic capacitors. Manufacturers make ceramic capacitors with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics are specified with EIA temperature characteristic codes of Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics provide high C-V products in a small package at low cost, but exhibit strong voltage and temperature coefficients, as shown in Figures 4 and 5. When used with a 5V regulator, a 16V 10F Y5V capacitor can exhibit an effective value as low as 1F to 2F for the DC bias voltage applied, and over the operating temperature range. The X5R and X7R dielectrics yield much more stable characteristics and are more suitable for use as the output capacitor. The X7R type works over a wider temperature range and has better temperature stability, while the X5R is less expensive and is available in higher values. Care still must be exercised when using X5R and X7R capacitors; the X5R and X7R codes only specify operating temperature range and maximum capacitance change over temperature. Capacitance change due to DC bias with X5R and X7R capacitors is better than Y5V and Z5U capacitors, but can still be significant enough to drop capacitor values below appropriate levels. Capacitor DC bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltage should be verified.
40 20
BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F
3050 F04
-100 -50 -25
Figure 4. Ceramic Capacitor DC Bias Characteristics
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Figure 5. Ceramic Capacitor Temperature Characteristics
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LT3050 Series APPLICATIONS INFORMATION
VOUT = 5V COUT = 10F CREF/BYP = 10nF VOUT 1mV/DIV
3050 F06
10ms/DIV
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
a heavy output load when the input voltage is high and the output voltage is low. Common situations are: immediately after the removal of a short-circuit or if the shutdown pin is pulled high after the input voltage is already turned on. The load line for such a load intersects the output current curve at two points. If this happens, there are two stable output operating points for the regulator. With this double intersection, the input power supply needs to be cycled down to zero and brought up again to make the output recover. Thermal Considerations The LT3050's maximum rated junction temperature of 125C limits its power handling capability. Two components comprise the power dissipated by the device: 1. Output current multiplied by the input/output voltage differential: IOUT * (VIN - VOUT), and 2. GND pin current multiplied by the input voltage: IGND * VIN GND pin current is determined using the GND Pin Current curves in the Typical Performance Characteristics section. Power dissipation equals the sum of the two components listed above. The LT3050 regulator has internal thermal limiting that protects the device during overload conditions. For continuous normal conditions, do not exceed the maximum junction temperature of 125C. Carefully consider all sources of thermal resistance from junction-to-ambient including other heat sources mounted in proximity to the LT3050. The undersides of the LT3050 DFN and MSOP packages have exposed metal from the lead frame to the die attachment. These packages allow heat to directly transfer from the die junction to the printed circuit board metal to control maximum operating junction temperature. The dual-in-line pin arrangement allows metal to extend beyond the ends of the package on the topside (component side) of a PCB. Connect this metal to GND on the PCB. The multiple IN and OUT pins of the LT3050 also assist in spreading heat to the PCB.
Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor, the stress is induced by vibrations in the system or thermal transients. The resulting voltages produced cause appreciable amounts of noise. A ceramic capacitor produced the trace in Figure 6 in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise. Overload Recovery Like many IC power regulators, the LT3050 has safe operating area protection. The safe area protection decreases current limit as input-to-output voltage increases, and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The LT3050 provides some output current at all values of input-to-output voltage up to the device breakdown. When power is first applied, the input voltage rises and the output follows the input; allowing the regulator to start-up into very heavy loads. During start-up, as the input voltage is rising, the input-to-output voltage differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem can occur wherein the removal of an output short will not allow the output to recover. Other regulators, such as the LT1083/LT1084/ LT1085 family and LT1764A also exhibit this phenomenon, so it is not unique to the LT3050. The problem occurs with
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LT3050 Series APPLICATIONS INFORMATION
For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes also can spread the heat generated by power devices. The following tables list thermal resistance as a function of copper area in a fixed board size. All measurements were taken in still air on a four-layer FR-4 board with one ounce solid internal planes and two ounce external trace planes with a total board thickness of 1.6mm. For further information on thermal resistance and using thermal information, refer to JEDEC standard JESD51, notably JESD51-12.
Table 1. MSOP Measured Thermal Resistance
COPPER AREA TOPSIDE BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 40C/W 41C/W 43C/W 45C/W
The power dissipated by the device equals: IOUT(MAX) * (VIN(MAX) - VOUT) + IGND * VIN(MAX) where, IOUT(MAX) = 75mA VIN(MAX) = 12.6V IGND at (IOUT = 75mA, VIN = 12V) = 1.5mA So, P = 75mA * (12.6V - 5V) + 1.5mA * 12.6V = 0.589W Using a DFN package, the thermal resistance ranges from 44C/W to 49C/W depending on the copper area. So the junction temperature rise above ambient approximately equals: 0.589W * 49C/W = 28.86C The maximum junction temperature equals the maximum ambient temperature plus the maximum junction temperature rise above ambient or: TJMAX = 85C + 28.86C = 113.86C Protection Features The LT3050 incorporates several protection features that make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device also protects against reverse-input voltages, reverse-output voltages and reverse output-toinput voltages. Current limit protection and thermal overload protection protect the device against current overload conditions at the output of the device. For normal operation, do not exceed a junction temperature of 125C.
2500 sq mm 2500 sq mm 2500 sq mm 1000 sq mm 2500 sq mm 2500 sq mm 225 sq mm 2500 sq mm 2500 sq mm 100 sq mm 2500 sq mm 2500 sq mm
Table 2. DFN Measured Thermal Resistance
COPPER AREA TOPSIDE 2500 sq mm 1000 sq mm 225 sq mm 100 sq mm BOARD AREA 2500 sq mm 2500 sq mm 2500 sq mm 2500 sq mm THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 44C/W 45C/W 47C/W 49C/W
Calculating Junction Temperature Example: Given an output voltage of 5V, an input voltage range of 12V 5%, a maximum output current range of 75mA and a maximum ambient temperature of 85C, what will the maximum junction temperature be?
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LT3050 Series APPLICATIONS INFORMATION
The LT3050 IN pin withstands reverse voltages of 50V. The device limits current flow to less than 300A (typically less than 10A) and no negative voltage appears at OUT. The device protects both itself and the load against batteries that are plugged in backwards. The SHDN pin cannot be driven below GND unless tied to the IN pin. If the SHDN pin is driven below GND while IN is powered, the output may turn on. SHDN pin logic cannot be referenced to a negative rail. The LT3050 incurs no damage if its output is pulled below ground. If the input is left open-circuit or grounded,
1.0 0.9 0.8 0.7 IOUT (A) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 10 20 30 VOUT (V) 40 50
3050 F07
the output can be pulled below ground by 50V. No current flows through the pass transistor from the output. However, current flows in (but is limited by) the resistor divider that sets the output voltage. Current flows from the bottom resistor in the divider and from the ADJ pin's internal clamp through the top resistor in the divider to the external circuitry pulling OUT below ground. If the input is powered by a voltage source, the output sources current equal to its current limit capability and the LT3050 protects itself by thermal limiting. In this case, grounding the SHDN pin turns off the device and stops the output from sourcing current.
ALL PINS GROUNDED EXCEPT FOR OUT
Figure 7. Reverse Output Current
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LT3050 Series PACKAGE DESCRIPTION
DDB Package 12-Lead Plastic DFN (3mm x 2mm)
(Reference LTC DWG # 05-08-1723 Rev O)
0.64 0.05 (2 SIDES) 0.70 0.05 2.55 0.05 1.15 0.05 PACKAGE OUTLINE 0.25 0.05 0.45 BSC 2.39 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 BAR TOP MARK (SEE NOTE 6)
3.00 0.10 (2 SIDES)
R = 0.05 TYP
R = 0.115 TYP 7
0.40 0.10 12
2.00 0.10 (2 SIDES) 0.64 0.10 (2 SIDES) 6 0.23 0.05 2.39 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD
1
PIN 1 R = 0.20 OR 0.25 45 CHAMFER
(DDB12) DFN 0106 REV O
0.200 REF
0.75 0.05
0.45 BSC
0 - 0.05
NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
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LT3050 Series PACKAGE DESCRIPTION
MSE Package 12-Lead Plastic MSOP Exposed Die Pad
(Reference LTC DWG # 05-08-1666 Rev B)
BOTTOM VIEW OF EXPOSED PAD OPTION
2.845 (.112 0.102 .004)
0.889 (.035
0.127 .005)
2.845 (.112
1
0.102 .004)
6 0.35 REF
5.23 (.206) MIN
1.651 (.065
0.102 3.20 - 3.45 .004) (.126 - .136)
0.12 REF DETAIL "B" CORNER TAIL IS PART OF DETAIL "B" THE LEADFRAME FEATURE. FOR REFERENCE ONLY 7 NO MEASUREMENT PURPOSE
12
0.65 0.42 0.038 (.0256) (.0165 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
4.039 0.102 (.159 .004) (NOTE 3)
12 11 10 9 8 7
0.406 0.076 (.016 .003) REF
0.254 (.010) GAUGE PLANE
DETAIL "A" 0 - 6 TYP 4.90 0.152 (.193 .006) 3.00 0.102 (.118 .004) (NOTE 4)
0.53 0.152 (.021 .006) DETAIL "A" 0.18 (.007) 123456 1.10 (.043) MAX 0.86 (.034) REF
SEATING PLANE
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
0.22 -0.38 (.009 - .015) TYP
0.650 (.0256) BSC
0.1016 (.004
0.0508 .002)
MSOP (MSE12) 0608 REV B
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
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LT3050 Series REVISION HISTORY
REV A DATE 6/10 DESCRIPTION Updated data sheet to include fixed voltage options. PAGE NUMBER 1-14, 17-26
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
25
LT3050 Series TYPICAL APPLICATION
5V Protected Antenna Supply with 100mA Current Limit, 10mA IMIN
IN 12V VIN 1F 120k SHDN FAULT LT3050-5 IMAX 10nF 1.15k (THRESHOLD = 100mA) IMON 3k (ADC FULL SCALE = 3V) IMIN 0.1F 11.3k (THRESHOLD = 10mA) REF/BYP GND
3050 TA02
OUT CFF 10nF ADJ 10F
5V
TO P ADC 0.1F
10nF
RELATED PARTS
PART NUMBER LT1761 LT1762 LT1763 LT1962 LT1963/A LT1965 LT3008 LT3009 LT3010 LT3011 LT3012 LT3013 DESCRIPTION 100mA, Low Noise LDO 150mA, Low Noise LDO 500mA, Low Noise LDO 300mA, Low Noise LDO 1.5A Low Noise, Fast Transient Response LDO 1.1A, Low Noise, Low Dropout Linear Regulator 20mA, 45V, 3A IQ Micropower LDO 20mA, 3A IQ Micropower LDO 50mA, High Voltage, Micropower LDO 50mA, High Voltage, Micropower LDO with PWRGD 250mA, 4V to 80V, Low Dropout Micropower Linear Regulator 250mA, 4V to 80V, Low Dropout Micropower Linear Regulator with PWRGD COMMENTS 300mV Dropout Voltage, Low Noise: 20VRMS , VIN = 1.8V to 20V, ThinSOT Package 300mV Dropout Voltage, Low Noise: 20VRMS , VIN = 1.8V to 20V, MS8 Package 300mV Dropout Voltage, Low Noise: 20VRMS , VIN = 1.8V to 20V, SO-8 Package 270mV Dropout Voltage, Low Noise: 20VRMS , VIN = 1.8V to 20V, MS8 Package 340mV Dropout Voltage, Low Noise: 40VRMS , VIN = 2.5V to 20V, "A" Version Stable with Ceramic Capacitors, TO-220, DD-PAK, SOT-223 and SO-8 Packages 290mV Dropout Voltage, Low Noise: 40VRMS , VIN : 1.8V to 20V, VOUT: 1.2V to 19.5V, Stable with Ceramic Capacitors, TO-220, DD-PAK, MSOP and 3 x 3 DFN Packages 300mV Dropout Voltage, Low IQ: 3A, VIN = 2.0V to 45V, VOUT = 0.6V to 39.5V; ThinSOT and 2mm x 2mm DFN-6 Packages 280mV Dropout Voltage, Low IQ: 3A, VIN = 1.6V to 20V, ThinSOT and SC-70 Packages VIN: 3V to 80V, VOUT: 1.275V to 60V, VDO = 0.3V, IQ = 30A, ISD < 1A, Low Noise: <100VRMS, Stable with 1F Output Capacitor, Exposed MS8 Package VIN: 3V to 80V, VOUT: 1.275V to 60V, VDO = 0.3V, IQ = 46A, ISD < 1A, Low Noise: <100VRMS, Power Good, Stable with 1F Output Capacitor, 3 x 3 DFN-10 and Exposed MS12E Packages VIN: 4V to 80V, VOUT : 1.24V to 60V, VDO = 0.4V, IQ = 40A, ISD < 1A, TSSOP-16E and 4mm x 3mm DFN-12 Packages VIN: 4V to 80V, VOUT: 1.24V to 60V, VDO = 0.4V, IQ = 65A, ISD < 1A, Power Good feature; TSSOP-16E and 4mm x 3mm DFN-12 Packages VIN: 3V to 80V (100V for 2ms, "HV" version), VOUT : 1.22V to 60V, VDO = 0.35V, IQ = 7A, ISD < 1A, ThinSOT and 3mm x 3mm DFN-8 Packages 300mV Dropout Voltage (2-supply operation), Low Noise: 40VRMS, VIN: 1.2V to 36V, VOUT : 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT set; Directly Parallelable (no op amp required), Stable with Ceramic Caps, TO-220, SOT-223, MSOP and 3mm x 3mm DFN Packages; "-1" Version has Integrated Internal Ballast Resistor 275mV Dropout Voltage (2-supply operation), Low Noise: 40VRMS , VIN: 1.2V to 36V, VOUT: 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT set; Directly Parallelable (no op amp required), Stable with Ceramic Caps, MSOP-8 and 2mm x 3mm DFN Packages
3050fa LT 0610 REV A * PRINTED IN USA
LT3014/HV 20mA, 3V to 80V, Low Dropout Micropower Linear Regulator LT3060 LT3080/-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator
100mA, Low Noise LDO with Soft Start 300mV Dropout Voltage, Low Noise: 20VRMS , VIN = 1.8V to 45V, DFN Package
LT3085
500mA, Parallelable. Low Noise, Low Dropout Linear Regulator
26 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2009

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