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LT1120 Micropower Regulator with Comparator and Shutdown
FEATURES
s s s s s s s s s
DESCRIPTIO
40A Supply Current 125mA Output Current 2.5V Reference Voltage Reference Output Sources 2mA and Sinks 2mA Open Collector Comparator Sinks 10mA Logic Shutdown 0.2V Dropout Voltage Thermal Limiting Available in 8-Lead DIP and SO Packages
The LT(R)1120 is a combination micropower positive regulator and free collector comparator on a single monolithic chip. With only 40A supply current, the LT1120 can supply over 125mA of output current. Input voltage range is from 4.5V to 36V and dropout voltage is 0.6V at 125mA. Dropout voltage decreases with lower load currents. Also included on the chip is a class B output 2.5V reference that can either source or sink current. A shutdown pin allows logic shutdown of the output. The comparator can be used for system or battery monitoring. For example, the comparator can be used to warn of low system voltage. Frequency compensation of the comparator for amplifier applications can be obtained by adding external output capacitance. The 2.5V reference will source or sink current. This allows it to be used as a supply splitter or auxiliary output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s
Battery Systems Battery-Backup System Portable Terminals Portable Instruments Memory Keep-Alive
TYPICAL APPLICATIO
Dropout Voltage and Supply Current
1.00 10
5V Regulator
SUPPLY CURRENT (mA)
VIN > 5.2V IQ = 40A 5 VIN LT1120 10F SHDN 3 SHUTDOWN FB GND 1 2 1M VOUT 4 0.001F 1M 5V
DROPOUT VOLTAGE (V)
+
+
25F
0.10
1120 TA01
0.01 0.1
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1 10 100 1 OUTPUT CURRENT (mA) 0.1 1000
1120 TA02
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1
LT1120
ABSOLUTE
AXI U RATI GS
Input Voltage ........................................................... 36V NPN Collector Voltage ............................................. 36V Output Short-Circuit Duration .......................... Indefinite Power Dissipation ............................... Internally Limited
PACKAGE/ORDER I FOR ATIO
TOP VIEW GND 1 FB 2 SHDN 3 VOUT 4 8 7 6 5 -INPUT COMPOUT REF VIN
ORDER PART NUMBER LT1120CN8 LT1120CS8 LT1120IN8 LT1120IS8 S8 PART MARKING 1120 1120I ORDER PART NUMBER LT1120CJ8
GND 1 FB 2 SHDN 3
S8 PACKAGE N8 PACKAGE 8-LEAD PLASTIC SO 8-LEAD PDIP TJMAX = 110C, JA = 130C/W (N) TJMAX = 110C, JA = 150C/W (S)
J8 PACKAGE 8-LEAD CERDIP TJMAX = 150C, JA = 100C/W (J)
OBSOLETE PACKAGES
Consider the N8 and S8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over thefull operating temperature range, otherwise specifications are at TA = 25C. Tj = 25C.
PARAMETER Reference Reference Voltage Line Regulation Load Regulation Output Source Current Output Sink Current Temperature Stability Regulator Supply Current VIN = 6V, IOUT 100A VIN = 36V, IOUT 100A VIN = 12V, IOUT = 125mA (VIN - VOUT) 1V, VIN 6V (VIN - VOUT) 1V, VIN 6V 6V VIN 36V IOUT = 100A IOUT = 125mA 125 0.2 0.01 0.02 0.4 0.5 0.015 0.05 0.65 45 75 11 80 100 20 A A mA mA % %/V V V
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ELECTRICAL CHARACTERISTICS
CONDITIONS 4.5V VIN 36V 4.5V VIN 36V
-2mA IREF 2mA, VIN = 12V VIN = 5V VIN = 5V 2 2
Output Current Load Regulation Line Regulation Dropout Voltage
2
U
U
W
WW U
W
(Note 1)
Operating Temperature Range LT1120C ................................................ 0C to 100C LT1120I ................................................ - 40 to 100C Storage Temperature Range ................. - 65C to 150C
TOP VIEW -INPUT 8 7 COMPOUT 6 REF 5 VIN
ORDER PART NUMBER LT1120CH
4 VOUT
H PACKAGE 8-LEAD TO-5 METAL CAN
TJMAX = 150C, JA = 150C/W, JC = 45C/W
MIN 2.46
TYP 2.50 0.01 0.3 4 4 1
MAX 2.54 0.015 0.6
UNITS V %/V % mA mA %
LT1120
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. Tj = 25C.
PARAMETER Feedback Sense Voltage Shutdown Pin Voltage VOUT 0.5V Shutdown Pin Current Feedback Bias Current Minimum Load Current Short-Circuit Current Comparator Offset Voltage Bias Current Gain Power Supply Rejection Output Sink Current Saturation Voltage Input Voltage Range Response Time Leakage Current VIN = 36V VIN = 36V (Note 2) VOUT = 29V, RL = 20k 4.5V VS 36V VIN = 4.5V IOUT = 1mA 0 5 2 2000 80 10 3 15 10000 96 18 0.4 0.6 VIN - 1 7 40 mV nA V/V dB mA V V s A VIN = 36V VIN = 36V VIN = 1.4V CONDITIONS VIN = 12V Normal Shutdown 2.2 1.4 25 15 1 300 40 5 400 MIN 2.44 TYP 2.5 MAX 2.56 0.4 UNITS V V V A nA A mA
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C.
PARAMETER Reference Reference Voltage Line Regulation Load Regulation Output Source Current Output Sink Current Regulator Supply Current VIN = 6V, IOUT 100A VIN = 36V, IOUT 100A VIN = 12V, IOUT = 125mA (VIN - VOUT) 1V, VIN 6V (VIN - VOUT) 1V, VIN 6V 6V VIN 36V IOUT = 100A IOUT = 125mA VIN = 12V VIN = 36V VIN = 36V
q q q q q q q q q q q q
CONDITIONS 4.5V VIN 36V 4.5V VIN 36V - 2mA IREF 2mA, VIN = 12V VIN = 5V VIN = 5V
q q q q q
MIN 2.40
TYP 2.50 0.01 0.4
MAX 2.55 0.02 0.8
UNITS V %/V % mA mA
2 2 65 85 11 125 1 0.02 0.06 0.85 2.38 2.5 2.57 50 50 300 400 95 100 20
A A mA mA % %/V V V V nA A mA
Output Current Load Regulation Line Regulation Dropout Voltage Feedback Sense Voltage Feedback Bias Current Minimum Load Current Short-Circuit Current
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3
LT1120
ELECTRICAL CHARACTERISTICS
PARAMETER Comparator Offset Voltage Bias Current Gain Output Sink Current Leakage Current VIN = 36V (Note 2) VOUT = 29V, RL = 20k VIN = 4.5V (Note 3) VIN = 36V
q q q q q
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C.
CONDITIONS MIN TYP MAX 10 15 1000 5 10 8 60 UNITS mV nA V/V mA A
Note 1: Absolute Maximum Ratings are those values beyond which the life a device may be impaired.
Note 2: TA > 85C, I bias maximum is 100nA. Note 3: For TA - 40C output current sink drops to 2.5mA.
TYPICAL PERFOR A CE CHARACTERISTICS
Regulator Load Regulation
0.3 TJ = -55C
OUTPUT VOLTAGE CHANGE (%)
SUPPLY CURRENT (mA)
TJ = 25C 0.1 0 TJ = 125C -0.1 -0.2 PRELOAD = 100A -0.3 0.1 10 100 1 OUTPUT CURRENT (mA) 1000
1120 G01
10
SHORT-CIRCUIT CURRENT (mA)
0.2
Dropout Voltage
REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1 VOUT = 100mV
MINIMUM LOAD CURRENT (A)
RIPPLE REJECTION (dB)
0.1
0.01 0.1
10 100 1000 1 REGULATOR OUTPUT CURRENT (mA)
1120 G04
4
UW
Supply Current
100 TJ = -55C TO 125C 300 250 200 150 100 50 350
Regulator Short-Circuit Current
1
0.1
CURRENT LIMIT TIED TO GROUND
0.01 0.1
10 100 1000 1 REGULATOR OUTPUT CURRENT (mA)
1120 G02
0 -50
-10
30 70 110 TEMPERATURE (C)
150
1120 G03
Regulator Minimum Load Current
100 70 65 60 55
Regulator Ripple Rejection
IOUT = 100mA
IOUT = 10mA 50 IOUT = 1mA 45 40 35 VIN = 10VDC, 1VP-P VOUT = 5V COUT = 10F 10 100 1k 10k RIPPLE FREQUENCY (Hz) 100k
1120 G06
10
1 70 80 90 100 110 120 130 140 150 TEMPERATURE (C)
1120 G05
30
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LT1120 TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current
10 IOUT = 100mA 10 TJ = -55C TO 125C IOUT = 100mA
SUPPLY CURRENT (mA)
1
SUPPLY CURRENT (mA)
IOUT = 10mA 0.1 IOUT = 1mA VOUT = 5V TJ = -55C TO 125C 0.01 1 5 10 15 20 25 REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1120 G07
Reference Regulation
4
REFERENCE VOLTAGE CHANGE (mV)
3
FEEDBACK CURRENT (nA)
2 1 0 -1 -2 -3 -4 -1.5
-1.0 -0.5 0 0.5 1.0 REFERENCE OUTPUT CURRENT (mA)
Regulator Thermal Regulation
OUTPUT VOLTAGE CHANGE (%)
0.1 VIN = 15V VOUT = 5V 0
OUTPUT VOLTAGE (V)
-0.1
OUTPUT CURRENT (mA)
50
0 0 20 40 60 80 100 120 140 160 180 TIME (ms)
1120 G12
UW
Supply Current at Dropout
1
IOUT = 10mA 0.1 IOUT = 1mA 0.01 1 0.1 0.2 0.3 0.4 0.5 0.6 REGULATOR INPUT-OUTPUT DIFFERENTIAL (V)
1120 G08
Feedback Pin Current
40 35 30 25 20 15 10 5 0 0.1 TJ = 125C TJ = 25C TJ = -55C
1.5
1 10 100 1000 REGULATOR OUTPUT CURRENT (mA)
1120 G11
1120 G09
LT1120 Turn-On Characteristic
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 0 0 1 2 RL = 50 3 4 5 6 INPUT VOLTAGE (V) 7 8 VOUT = 5V
NO LOAD
RL = 500
1120 G13
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5
LT1120
PI FU CTIO S
GND (Pin 1): Ground. FB (Pin 2): Feedback. This is the feedback point of the regulator. When operating, it is nominally at 2.5V. Optimum source resistance is 200k to 500k. The feedback pin should not be driven below ground or more positive than 5V. SHDN (Pin 3): Shutdown. A logic 1 shuts off the main regulator. Caution: noise or leakage into the shutdown pin can affect output voltage. VOUT (Pin 4): Regulator Output. Main output, requires a 10F output capacitor. Can be shorted to VIN or ground without damaging the device. VIN (Pin 5): Input Supply. Bypass with a 10F capacitor. Must always be more positive than ground. REF (Pin 6): Reference. 2.5V can source or sink current. May be shorted to ground or up to 5V. Voltages in excess of 5V can damage the device. COMPOUT (Pin 7): Comparator Output. Open Collector NPN Output. May be connected to any voltage from ground to 36V more positive than ground (operates above VIN). Short-circuit protected. - INPUT (Pin 8): Comparator Input. Inverting comparator input.
BLOCK DIAGRA
VIN 5 50k
COMPOUT 7
APPLICATIO S I FOR ATIO
The LT1120 is especially suited for micropower system applications. For example, the comparator section of the LT1120 may be used as a battery checker to provide an indication of low battery. Another type of system application for the LT1120 would be to generate the equivalent of split supplies off of a single power input. The regulator section provides regulated output voltage and the reference, which can both source and sink current, is then an artificial system ground providing a split supply for the system.
6
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W
W
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REF 6
+ -
REF 2.5V
- +
4 VOUT 2 FB
60k 3 SHDN 1 GND
1120 BD
8 -INPUT
For many applications the comparator can be frequency compensated to operate as an amplifier. Compensation values for various gains are given in the data sheet. The comparator gain is purposely low to make it easier to frequency compensate as an amplifier. The NPN output is capable of sinking 10mA and can drive loads connected to voltages in excess of the positive power supply. This is useful for driving switches or linear regulators off of a higher input voltage.
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LT1120
APPLICATIO S I FOR ATIO
Reference
Internal to the LT1120 is a 2.5V trimmed class B output reference. The reference was designed to be able to source or sink current so it could be used in supply splitting applications as well as a general purpose reference for external circuitry. The design of the reference allows it to source typically 4mA or 5mA and sink 2mA. The available source and sink current decreases as temperature increases. It is sometimes desirable to decrease the AC output impedance by placing an output capacitor on them. The reference in the LT1120 becomes unstable with large capacitive loads placed directly on it. When using an output capacitor, about 20 should be used to isolate the capacitor from the reference pin. This 20 resistor can be placed directly in series with the capacitor or alternatively the reference line can have 20 placed in series with it and then a capacitor to ground. This is shown in Figure 1. Other than placing large capacitive loads on the reference, no other precautions are necessary and the reference is stable with nominal stray capacitances.
REF 6 20
OUTPUT OR
REF 6 20
+
10F
+
OUTPUT 10F
1120 F01
Figure 1. Bypassing Reference
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Overload Protection The main regulator in the LT1120 is current limited at approximately 250mA. The current limit is stable with both input voltage and temperature. Like most other IC regulators, a minimum load is required on the output of the LT1120 to maintain regulation. For most standard regulators this is normally specified at 5mA. Of course, for a micropower regulator this would be a tremendously large current. The output must be large enough to absorb all the leakage current of the pass transistor at the maximum operating temperature. It also effects the transient response; low output currents have long recovery times from load transients. At high operating temperatures the minimum load current increases and having too low of a load current may cause the output to go unregulated. Devices are tested for minimum load current at high temperature. The output voltage setting resistors to the feedback terminal can usually be used to provide the minimum load current. Frequency Compensation The LT1120 is frequency compensated by a dominant pole on the output. An output capacitor of 10F is usually large enough to provide good stability. Increasing the output capacitor above 10F further improves stability. In order to ensure stability, a feedback capacitor is needed between the output pin and the feedback pin. This is because stray capacitance can form another pole with the large value of feedback resistors used with the LT1120. Also, a feedback capacitor minimizes noise pickup and improves ripple rejection. With the large dynamic operating range of the output current, 10000:1, frequency response changes widely. Low AC impedance capacitors are needed to insure stability. While solid tantalum are best, aluminum electrolytics can be used but larger capacitor values may be needed.
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7
LT1120
TYPICAL APPLICATIO S
Regulator with Output Voltage Monitor
5 5V 500k LOGIC LOGIC OUTPUT 7 LT1120 VIN VOUT 4 VOUT 5V 0.001F -INPUT 8 98k VOUT
LOGIC OUTPUT GOES LOW WHEN VOUT DROPS BY 100mV
Compensating the Comparator as an Op Amp
50A
6
+ -
1M
7
AT Av = 100, SLEW RATE = +0.05V/s -6V/s
8
R2 C2
R1
C1
1120 TA04
Av 1 10 100
R1 33 100 10k
C1 0.1F 0.047F 0.002F
C2 0.001F -- --
8
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- +
FB REF 6 GND 1 2
+
2k 10F
PIN 7 LOGIC OUTPUT
100k
1120 TA03
1A Low Dropout Regulator
VIN
2.2k MJE2955 5 VIN LT1120 FB GND 1 2 150* 100k VOUT 4 * 10k* 100k 0.001F VOUT 5V
+
220F
R2 -- 100k 10k
* FOR CURRENT LIMIT 1.5A MUST HAVE LOW ESR. SEVERAL 100F CAPACITORS CAN BE PARALLELED.
1120 TA05
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LT1120
TYPICAL APPLICATIO S
5V Regulator
VIN > 5.2V IQ = 40A 5 VIN LT1120 10F GND 1 1M FB 2 VOUT 4 0.001F 1M 5V
+
BATTERY INPUT
5
VIN LT1120
INTERNAL PARASITIC DIODES OF LT1120 VIN VOUT
VIN > 5.2V IQ = 40A
* TRANSISTOR USED BECAUSE OF LOW LEAKAGE CHARACTERISTICS. TO TURN OFF THE OUTPUT OF THE LT1120 FORCE FB (PIN 2) > 2.5V.
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Regulator with Improved Transient Response
VIN > 5.2V 5 VIN LT1120 VOUT 4 0.001F FB GND 1 2 0.001F 22k 1M 1M 5V
+
25F
+
25F
1120 TA06
1120 TA07
Battery-Backup Regulator
VOUT 5V VOUT 4 4 VOUT LT1120 2 50k FB GND 1 VIN 5 MAIN POWER INPUT
+
0.001F 1M 10F 2
FB GND 1
1M
1120 TA08
5V Regulator with Feedback Shutdown
5 VIN LT1120 FB GND 1 1M 2 VOUT 4
+
0.001F 1M
5V OUT 10F
2N3904* NC
LOGIC INPUT
1120 TA09
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9
W W
LT1120
SCHE ATIC DIAGRA
10
REF 6 FB 2 5 VIN R35 42k Q19 C6 100pF Q38 Q39 Q51 Q55 R23 30k R24 390k Q52 C5 100pF Q42 Q56 R22 30k Q54 R8 40k R19 40k R33 47k 138.3k Q25 Q58 4 VOUT Q20 Q28 Q24 Q29 Q40 Q43 125k Q41 125k C2 25pF Q30 R17 100 R7 6.8k Q33 Q35 Q60 Q22 Q63 Q32 Q34 R10 75k R8 100k Q36 Q49 Q62 R16 6k Q45 Q37 Q46 Q47 R32 2k Q48 R30 2k R31 10 C3 10pF Q21 R11 15k Q31 Q44 Q27 Q26 Q23 C1 10pF Q61 100pF R27 15k R14 15k R15 80k R18 15k Q59 R34 60k 3 SHDN R26 15k R28 2k R29 5 100pF R6 3k 15k 281k R38 20k 8 -INPUT
1120 Schem
R4 42k
Q13
Q14
Q2
Q15 Q16
COMPOUT 7
Q10
Q6
Q5
Q9
Q11
Q8
Q17 Q18
Q7
Q12
R1 25
R36 60k
R2 50k
R37 110.8k
R3 50k
1 GND
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LT1120
PACKAGE DESCRIPTIO
.335 - .370 (8.509 - 9.398) DIA .305 - .335 (7.747 - 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 - .185 (4.191 - 4.699) REFERENCE PLANE .500 - .750 (12.700 - 19.050) .110 - .160 (2.794 - 4.064) INSULATING STANDOFF 45TYP .028 - .034 (0.711 - 0.864)
SEATING PLANE .010 - .045* (0.254 - 1.143) .016 - .021** (0.406 - 0.533)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610)
.300 BSC (7.62 BSC)
CORNER LEADS OPTION (4 PLCS)
.008 - .018 (0.203 - 0.457)
0 - 15 .045 - .068 (1.143 - 1.650) FULL LEAD OPTION
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381)
.065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
(
+.035 .325 -.015 +0.889 8.255 -0.381
)
INCHES MILLIMETERS
NOTE: 1. DIMENSIONS ARE
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.
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H Package 8-Lead TO-5 Metal Can (.230 Inch PCD)
(Reference LTC DWG # 05-08-1321)
.027 - .045 (0.686 - 1.143) PIN 1 .230 (5.842) TYP
H8 (TO-5) 0.230 PCD 0801
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.200 (5.080) MAX .015 - .060 (0.381 - 1.524) .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5
.023 - .045 (0.584 - 1.143) HALF LEAD OPTION
.025 (0.635) RAD TYP 1 2 3
.220 - .310 (5.588 - 7.874)
4
J8 0801
.045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC
.125 3.175 MIN
OBSOLETE PACKAGES
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.045 - .065 (1.143 - 1.651) .130 .005 (3.302 0.127) .400* (10.160) MAX 8 7 6 5
.255 .015* (6.477 0.381)
1
2
3
4
N8 1002
.100 (2.54) BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
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LT1120
TYPICAL APPLICATIO
* SETS CURRENT LIMIT BUT INCREASES DROPOUT VOLTAGE BY 0.5V MUST HAVE LOW ESR. SEVERAL 100F CAPACITORS CAN BE PARALLELED
PACKAGE DESCRIPTIO
.010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254)
.053 - .069 (1.346 - 1.752) 0- 8 TYP
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.014 - .019 (0.355 - 0.483) TYP
RELATED PARTS
PART NUMBER LT1121 LT1521 LT1761 DESCRIPTION 150mA Micropower Low Dropout Regulator 300mA Mircopower Low Dropout Regulator 100mA Micropower Low Noise, Low Dropout Regulator COMMENTS 0.4V Dropout Voltage, Includes Shutdown, SOT-223, S8 Packages Lowest IQ Low Dropout Regulator, SOT-223, S8, MS8 Packages SOT-23, 20VRMS Noise, 20A IQ, ThinSOT Package
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
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Current Limited 1A Regulator
0.5* VIN 2.2k MJE2955 5 VIN VOUT 4 0.22F FB GND 1 270 100k 2 100k VOUT 5V AT 1A 2N3906* LT1120
+
220F
1120 TA10
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 8 .004 - .010 (0.101 - 0.254) .228 - .244 (5.791 - 6.197) .150 - .157 (3.810 - 3.988) NOTE 3 .245 MIN .160 .005 7 6 5 .050 BSC
.045 .005
.050 (1.270) BSC
SO8 0303
1
2
3
4
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT
1120fc LT/TP 0403 1K REV C * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1989

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