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LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V FEATURES
n n n n n n n
DESCRIPTION
The LT(R)1117 is a positive low dropout regulator designed to provide up to 800mA of output current. The device is available in an adjustable version and fixed output voltages of 2.85V, 3.3V and 5V. The 2.85V version is designed specifically to be used in Active Terminators for the SCSI bus. All internal circuitry is designed to operate down to 1V input to output differential. Dropout voltage is guaranteed at a maximum of 1.2V at 800mA, decreasing at lower load currents. On chip trimming adjusts the reference/output voltage to within 1%. Current limit is also trimmed in order to minimize the stress on both the regulator and the power source circuitry under overload conditions. The low profile surface mount SOT-223 package allows the device to be used in applications where space is limited. The LT1117 requires a minimum of 10F of output capacitance for stability. Output capacitors of this size or larger are normally included in most regulator designs. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the LT1117 flows into the load, increasing efficiency.
Space Saving SOT-223 Surface Mount Package 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V Output Current of 800mA Operates Down to 1V Dropout Guaranteed Dropout Voltage at Multiple Current Levels 0.2% Line Regulation Max 0.4% Load Regulation Max
APPLICATIONS
n n n n n
Active SCSI Terminators High Efficiency Linear Regulators Post Regulators for Switching Supplies Battery Chargers 5V to 3.3V Linear Regulators
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus
1.4 110 110 LT1117-2.85 IN 4.75V TO 5.25V OUT GND 10F DROPOUT VOLTAGE (V) 110 18 TO 27 LINES 1.2 1.0 TJ = 25C 0.8 0.6 0.4 0.2 INDICATES GUARANTEED TEST POINT 0 0 100 200 300 400 500 600 700 800 OUTPUT CURRENT (mA)
1117 TA02
Dropout Voltage (VIN - VOUT)
-40C TJ < 0C 0C TJ 125C
+
+
22F
TJ = 125C
110
1117 TA01
1117fd
1
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage Operating Voltage LT1117, LT1117-3.3, LT1117-5 .........................15V LT1117-2.85 .....................................................10V Surge Voltage LT1117, LT1117-3.3, LT1117-5 .........................20V
Operating JunctionTemperature Range C Grade .................................................. 0C to 125C I Grade ...............................................- 40C to 125C Storage Temperature Range...................-65C to 150C Lead Temperature ....................(See Soldering Methods)
PIN CONFIGURATION
FRONT VIEW 3 TAB IS VOUT 2 1 IN OUT ADJ/GND TAB IS VOUT FRONT VIEW 3 2 1 M PACKAGE 3-LEAD PLASTIC DD-PAK TJMAX = 125C, JC = 10C/W IN OUT ADJ/GND
ST PACKAGE 3-LEAD PLASTIC SOT-223 TJMAX = 125C, JC = 15C/W
ORDER INFORMATION
LEAD FREE FINISH LT1117CST#PBF LT1117IST#PBF LT1117CST-2.85#PBF LT1117IST-2.85#PBF LT1117CST-3.3#PBF LT1117IST-3.3#PBF LT1117CST-5#PBF LT1117IST-5#PBF LT1117CM#PBF LT1117CM-2.85#PBF LT1117CM-3.3#PBF LT1117CM-5#PBF TAPE AND REEL LT1117CST#TRPBF LT1117IST#TRPBF LT1117CST-2.85#TRPBF LT1117IST-2.85#TRPBF LT1117CST-3.3#TRPBF LT1117IST-3.3#TRPBF LT1117CST-5#TRPBF LT1117IST-5#TRPBF LT1117CM#TRPBF LT1117CM-2.85#TRPBF LT1117CM-3.3#TRPBF LT1117CM-5#TRPBF PART MARKING 1117 1117I 11172 1117I2 11173 1117I3 11175 1117I5 LT1117CM LT1117CM-2.85 LT1117CM-3.3 LT1117CM-5 PACKAGE DESCRIPTION 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK TEMPERATURE RANGE 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C 0C to 125C 0C to 125C 0C to 125C
1117fd
2
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ORDER INFORMATION
LEAD BASED FINISH LT1117CST LT1117IST LT1117CST-2.85 LT1117IST-2.85 LT1117CST-3.3 LT1117IST-3.3 LT1117CST-5 LT1117IST-5 LT1117CM LT1117CM-2.85 LT1117CM-3.3 LT1117CM-5 TAPE AND REEL LT1117CST#TR LT1117IST#TR LT1117CST-2.85#TR LT1117IST-2.85#TR LT1117CST-3.3#TR LT1117IST-3.3#TR LT1117CST-5#TR LT1117IST-5#TR LT1117CM#TR LT1117CM-2.85#TR LT1117CM-3.3#TR LT1117CM-5#TR PART MARKING 1117 1117I 11172 1117I2 11173 1117I3 11175 1117I5 LT1117CM LT1117CM-2.85 LT1117CM-3.3 LT1117CM-5 PACKAGE DESCRIPTION 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic SOT-223 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK 3-Lead Plastic DD-PAK TEMPERATURE RANGE 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C -40C to 125C 0C to 125C 0C to 125C 0C to 125C 0C to 125C
Consult LTC Marketing for parts specified with wider operating temperature ranges. 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/
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25C.
PARAMETER Reference Voltage Output Voltage LT1117 LT1117-2.85 CONDITIONS IOUT = 10mA, (VIN - VOUT) = 2V, TJ = 25C 10mA IOUT 800mA, 1.4V (VIN - VOUT) 10V IOUT = 10mA, VIN = 4.85V, TJ = 25C 0 IOUT 800mA, 4.25V VIN 10V 0 IOUT 500mA, VIN = 3.95V IOUT = 10mA, VIN = 5V, TJ = 25C 0 IOUT 800mA, 4.75V VIN 10V IOUT = 10mA, VIN = 7V, TJ = 25C 0 IOUT 800mA, 6.5V VIN 12V IOUT = 10mA, 1.5V VIN - VOUT 15V (Note 2) IOUT = 0mA, 4.25V VIN 10V (Note 2) IOUT = 0mA, 4.75V VIN 15V (Note 2) IOUT = 0mA, 6.5V VIN 15V (Note 2) (VIN - VOUT) = 3V, 10mA IOUT 800mA (Note 2) VIN = 4.25V, 0 IOUT 800mA (Note 2) VIN = 4.75V, 0 IOUT 800mA (Note 2) VIN = 6.5V, 0 IOUT 800mA (Note 2) IOUT = 100mA, 0C TJ 125C (Note 3) IOUT = 500mA, 0C TJ 125C (Note 3) IOUT = 800mA, 0C TJ 125C (Note 3) IOUT = 100mA, - 40C TJ < 0C (Note 3) IOUT = 500mA, - 40C TJ < 0C (Note 3) IOUT = 800mA, - 40C TJ < 0C (Note 3) Current Limit Minimum Load Current LT1117 (VIN - VOUT) = 5V, TJ = 25C (VIN - VOUT) = 15V (Note 4)
l l l l l l l l l l l l l l
ELECTRICAL CHARACTERISTICS
MIN 1.238 1.225 2.820 2.790 2.790 3.267 3.235 4.950 4.900
TYP 1.250 1.250 2.850 2.850 2.850 3.300 3.300 5.000 5.000 0.035 1 1 1 0.1 1 1 1 1.00 1.05 1.10 1.00 1.05 1.10
MAX 1.262 1.270 2.880 2.910 2.910 3.333 3.365 5.050 5.100 0.2 6 6 10 0.4 10 10 15 1.10 1.15 1.20 1.20 1.25 1.30 1200 5
UNITS V V V V V V V V V % mV mV mV % mV mV mV V V V V V V mA mA
1117fd
LT1117-3.3 LT1117-5 Line Regulation LT1117 LT1117-2.85 LT1117-3.3 LT1117-5 LT1117 LT1117-2.85 LT1117-3.3 LT1117-5
Load Regulation
Dropout Voltage
800
950 1.7
3
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ELECTRICAL CHARACTERISTICS
PARAMETER Quiescent Current LT1117-2.85 LT1117-3.3 LT1117-5 CONDITIONS VIN 10V VIN 15V VIN 15V TA = 25C, 30ms Pulse fRIPPLE = 120Hz, (VIN - VOUT) = 3V, VRIPPLE = 1VP-P 10mA IOUT 800mA, 1.4V (VIN - VOUT) 10V TA = 125C, 1000Hrs (% of VOUT), 10Hz f 10kHz (Junction-to-Case, at Tab)
l l l l l l
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25C.
MIN TYP 5 5 5 0.01 60 75 55 0.2 0.5 0.3 0.003 15 120 5 MAX 10 10 10 0.1 UNITS mA mA mA %/W dB A A % % % C/W
Thermal Regulation Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability RMS Output Noise Thermal Resistance
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. Note 2: See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction temperature by low duty cycle pulse testing.
Note 3: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve. Note 4: Minimum load current is defined as the minimum output current required to maintain regulation.
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current (Adjustable Device)
4 MINIMUM OPERATING CURRENT (mA) 1.25 OUTPUT VOLTAGE DEVIATION (%) TJ = 125C TJ = 25C 0.75
Short-Circuit Current
0.10 0.05 0 -0.05 -0.10 -0.15
Load Regulation
ILOAD = 800mA
SHORT CIRCUIT CURRENT (A)
1.00
3
TJ = 125C TJ = 25C
2 TJ = -55C 1
0.50
0.25
0 0 10 15 5 INPUT/OUTPUT DIFFERENTIAL (V) 20
1117 G01
0 0 5 10 INPUT/OUTPUT DIFFERENTIAL (V) 15
1117 G02
-0.20 -50
-25
0 25 50 75 TEMPERATURE (C)
100
125
1117 G03
1117fd
4
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL PERFORMANCE CHARACTERISTICS
LT1117 Ripple Rejection
100 90 80 RIPPLE REJECTION (dB) 70 60 50 40 30 20 10 0 CADJ = 200F AT f < 60Hz CADJ = 25F AT f > 60Hz IOUT = 0.5A 10 100 1k 10k FREQUENCY (Hz) 100k
1117 G04
LT1117 Ripple Rejection vs Current
100 VRIPPLE 0.5VP-P RIPPLE REJECTION (dB) 90 80 VOUT = 5V CADJ = 25F COUT = 25F 2.0 OUTPUT VOLTAGE CHANGE (%)
Temperature Stability
VRIPPLE 3VP-P
fRIPPLE = 120Hz VRIPPLE 3VP-P fRIPPLE = 20kHz VRIPPLE 0.5VP-P
(VIN - VOUT) 3V
1.0
70 60 50 40 30 20 10 0 0
0
(VIN - VOUT) VDROPOUT
-1.0
0.2 0.4 0.6 OUTPUT CURRENT (A)
0.8
1117 G05
-2.0 -50 -25
0
25 50 75 100 125 150 TEMPERATURE (C)
1117 G06
Adjust Pin Current
100 OUTPUT VOLTAGE DEVIATION (V) 90 ADJUST PIN CURRENT (A) 80 70 60 50 40 LOAD CURRENT (A) 30 20 10 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
1117 G07
LT1117-2.85 Load Transient Response
0.3 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (s)
1117 G08
LT1117-5 Load Transient Response
0.3 OUTPUT VOLTAGE DEVIATION (V) LOAD CURRENT (A) CIN = 10F 0.2 COUT = 10F TANTALUM VIN = 6.5V 0.1 PRELOAD = 0.1A 0 -0.1 -0.2 0.5 0 -0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (s)
1117 G09
CIN = 10F COUT = 10F TANTALUM VIN = 4.25V PRELOAD = 0.1A
LT1117-2.85 Line Transient Response
60 OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (mV) CIN = 1F 40 COUT = 10F TANTALUM IOUT = 0.1A 20 0 -20 -40 INPUT VOLTAGE (V) 5.25 4.25 3.25 0 20 40 60 80 100 120 140 160 180 200 TIME (s)
1117 G10
LT1117-5 Line Transient Response
60 40 20 0 -20 -40 INPUT VOLTAGE (V) 7.50 6.50 5.50 0 20 40 60 80 100 120 140 160 180 200 TIME (s)
1117 G11
CIN = 1F COUT = 10F TANTALUM IOUT = 0.1A
1117fd
5
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 BLOCK DIAGRAM
IN
+ -
THERMAL LIMIT
ADJ
OUT
GND
FOR FIXED VOLTAGE DEVICE
1117 BD01
1117fd
6
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION
The LT1117 family of 3-terminal regulators are easy to use. They are protected against short circuit and thermal overloads. Thermal protection circuitry will shut down the regulator should the junction temperature exceed 165C at the sense point. These regulators are pin compatible with older 3-terminal adjustable regulators, offer lower dropout voltage and more precise reference tolerance. Reference stability over temperature is improved over older types of regulators. Stability The LT1117 family of regulators requires an output capacitor as part of the device frequency compensation. A minimum of 10F of tantalum or 50F of aluminum electrolytic is required. The ESR of the output capacitor should be less than 0.5. Surface mount tantalum capacitors, which have very low ESR, are available from several manufacturers. When using the LT1117 adjustable device, the adjust terminal can be bypassed to improve ripple rejection. When the adjust terminal is bypassed, the required value of the output capacitor increases. The device will require an output capacitor of 22F tantalum or 150F aluminum electrolytic when the adjust pin is bypassed. Normally, capacitor values on the order of 100F are used in the output of many regulators to ensure good load transient response with large load current changes. Output capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response. Protection Diodes In normal operation, the LT1117 family does not need any protection diodes. Older adjustable regulators required protection diodes between the adjust pin and the output and between the output and input to prevent over stressing the die. The internal current paths on the LT1117 adjust pin are limited by internal resistors. Therefore, even with capacitors on the adjust pin, no protection diode is needed to ensure device safety under short-circuit conditions. The adjust pin can be driven, on a transient basis, 25V with respect to the output without any device degradation. Diodes between input and output are not usually needed. The internal diode between the output and input pins of the device can withstand microsecond surge currents of 10A to 20A. Normal power supply cycling can not generate currents of this magnitude. Only with extremely large output capacitors, such as 1000F and larger, and with the input pin instantaneously shorted to ground can damage occur. A crowbar circuit at the input of the LT1117 in combination with a large output capacitor could generate currents large enough to cause damage. In this case a diode from output to input is recommended, as shown in Figure 1.
D1 1N4002 (OPTIONAL)
LT1117 VIN IN ADJ OUT R1
+
VOUT COUT 150F
+
CADJ 10F
R2
1117 F01
Figure 1
1117fd
7
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION
Output Voltage The LT1117 develops a 1.25V reference voltage between the output and the adjust terminal (see Figure 2). By placing a resistor between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is chosen to be the specified minimum load current of 10mA. Because IADJ is very small and constant when compared to the current through R1, it represents a small error and can usually be ignored. For fixed voltage devices R1 and R2 are included in the device.
LT1117 VIN IN ADJ IADJ 50A R2 VOUT = VREF 1 + -- + IADJ R2 R1 R2 OUT VREF R1 VOUT LT1117 VIN IN ADJ R1 CONNECT R1 TO CASE R2 RL OUT RP PARASITIC LINE RESISTANCE
1117 F03
CONNECT R2 TO LOAD
Figure 3. Connections for Best Load Regulation +
For fixed voltage devices the top of R1 is internally Kelvin connected, and the ground pin can be used for negative side sensing. Thermal Considerations
1117 F02
Figure 2. Basic Adjustable Regulator
Load Regulation Because the LT1117 is a 3-terminal device, it is not possible to provide true remote load sensing. Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the output pin of the device. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the resistor divider (R1) is returned directly to the output pin of the device, not to the load. This is illustrated in Figure 3. Connected as shown, RP is not multiplied by the divider ratio. If R1 were connected to the load, the effective resistance between the regulator and the load would be: RP x R2+R1 ,RP = Parasitic Line Resistance R1
LT1117 series regulators have internal thermal limiting circuitry designed to protect the device during overload conditions. For continuous normal load conditions however, the maximum junction temperature rating of 125C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. For the SOT-223 package, which is designed to be surface mounted, additional heat sources mounted near the device must also be considered. Heat sinking is accomplished using the heat spreading capability of the PC board and its copper traces. The thermal resistance of the LT1117 is 15C/W from the junction to the tab. Thermal resistances from tab to ambient can be as low as 30C/W. The total thermal resistance from junction to ambient can be as low as 45C/W. This requires a reasonable sized PC board with at least one layer of copper to spread the heat across the board and couple it into the surrounding air.
1117fd
8
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION
Experiments have shown that the heat spreading copper layer does not need to be electrically connected to the tab of the device. The PC material can be very effective at transmitting heat between the pad area, attached to the tab of the device, and a ground plane layer either inside or on the opposite side of the board. Although the actual thermal resistance of the PC material is high, the Length/ Area ratio of the thermal resistor between layers is small. The data in Table 1 was taken using 1/16" FR-4 board with 1oz. copper foil. It can be used as a rough guideline in estimating thermal resistance.
Table 1.
COPPER AREA TOPSIDE* BACKSIDE 2500 Sq. mm 2500 Sq. mm 1000 Sq. mm 2500 Sq. mm 225 Sq. mm 100 Sq. mm 2500 Sq. mm 2500 Sq. mm THERMAL RESISTANCE BOARD AREA (JUNCTION-TO-AMBIENT) 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 1000 Sq. mm 1000 Sq. mm 45C/W 45C/W 53C/W 59C/W 52C/W 55C/W
The power dissipation of the LT1117 is equal to: PD = ( VIN - VOUT )( IOUT ) Maximum junction temperature will be equal to: TJ = TA(MAX) + PD (Thermal Resistance (junction-toambient)) Maximum junction temperature must not exceed 125C. Ripple Rejection The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. These curves will hold true for all values of output voltage. For proper bypassing, and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100 to 200. The size of the required adjust pin capacitor is a function of the input ripple frequency. At 120Hz, with R1 = 100, the adjust pin capacitor should be >13F. At 10kHz only 0.16F is needed. For fixed voltage devices, and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (VOUT/VREF). For example, with the output voltage equal to 5V, the output ripple will be increased by the ratio of 5V/1.25V. It will increase by a factor of four. Ripple rejection will be degraded by 12dB from the value shown on the curve.
1000 Sq. mm 1000 Sq. mm 1000 Sq. mm 0
* Tab of device attached to topside copper
The thermal resistance for each application will be affected by thermal interactions with other components on the board. Some experimentation will be necessary to determine the actual value.
1117fd
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LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS
1.2V to 10V Adjustable Regulator
LT1117 VIN IN ADJ OUT R1 121 VOUT VIN IN
5V Regulator with Shutdown
LT1117 OUT ADJ 10F 1k TTL 1k 2N3904 121 1% 5V
+ +
C2 100F
+
C1* 10F
+
100F 365 1%
R2 1k
* NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS R2 V -- OUT = 1.25V 1 + R1
()
1117 TA04
1117 TA03
Remote Sensing
LT1117 VIN IN ADJ 100F 25 6 1 121 8 4 365 100pF OUT RP (MAX. DROP 300mV)
OUTPUT 5V
+
VIN 7 LM301A
- +
2 RL
+
10F
3 1k 5F
+
RETURN 25 RETURN
1117 TA05
Adjusting Output Voltage of Fixed Regulators
LT1117-5 VIN > 12V 10F
Regulator with Reference
LT1117-5
+
IN GND
OUT
+
5V TO 10V 100F
VIN > 11.5V 10F
+
IN GND
OUT
+
10V 100F
+
10F* 1k
5VOUT LT1029
1117 TA07
* OPTIONAL IMPROVES RIPPLE REJECTION
1117 TA06
1117fd
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LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS
Battery Charger
LT1117 VIN IN 1.25V ADJ OUT RS R1 R2 VOUT - 1.25V 1 + -- R1 IF = R2 -RS 1 + -- R1 IF = VOUT 1 R2 -RS 1 + -- R1 IF VOUT VIN 10F
Battery Backed Up Regulated Supply
LT1117-5 5.2V LINE 5.0V BATTERY
+
IN GND
OUT
50 SELECT FOR CHARGE RATE
() () ()
6.5V
1117 TA08
LT1117-5 IN GND OUT
+
10F
+
100F
1117 TA09
Improving Ripple Rejection
LT1117 VIN 10F
Automatic Light Control
LT1117
+
IN ADJ
OUT
R1 121 1%
5V
+
10F
IN ADJ
OUT 1.2k
+
100F
+ +
150F C1 10F
1117 TA10
* C1 IMPROVES RIPPLE REJECTION. XC SHOULD BE R1 AT RIPPLE FREQUENCY
R2 365 1%
1117 TA11
High Efficiency Dual Supply
FEEDBACK PATH MUR410 3.3V OUTPUT (TYPICAL)
+
470F
MUR410 IN
LT1117-5 OUT GND 470F +5V 0.5A
+
+VIN MUR410 SWITCHING REGULATOR IN
+
10F 1N4002
LT1117-5 OUT GND 470F
+
+
10F 1N4002 -5V 0.5A
1117 TA12
1117fd
11
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS
High Efficiency Dual Linear Supply
L1 285H MBR360 (HEAT SINK) 2N6667 Q1 (DARLINGTON) 10k 1k LT1117-5 5V 0.5A
+
1000F 510k 30k V+ 2.4k
IN GND
OUT
LT1004-2.5
+
MDA201
+
100F 20k* 30.1k*
D11 1N4002
-
+
4700F
+ -
1/2 LT1018
130VAC TO 90VAC
STANCOR P-8685 (HEAT SINK) 2N6667 (DARLINGTON)
L1 285H MBR360 10k 1k
LT1117-5
+
1000F 510k 30k 2.4k
IN GND
OUT
LT1004-2.5
+
MDA201
+
100F 20k* 30.1k*
D2 1N4002
+
4700F
+
1/2 LT1018 V-
-
-
-5V 0.5A
1117 TA13
* = 1% FILM RESISTORS MDA = MOTOROLA L1 = PULSE ENGINEERING, INC. #PE-92106
Low Dropout Negative Supply
LT1117-5 VIN IN OUT GND 10F FLOATING INPUT
+
+
100F VOUT = -5V
1117 TA14
1117fd
12
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTION
M Package 3-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1460)
.060 (1.524) TYP .390 - .415 (9.906 - 10.541) 15 .060 (1.524)
.256 (6.502)
.060 (1.524)
.165 - .180 (4.191 - 4.572)
.045 - .055 (1.143 - 1.397) +.008 .004 -.004 +0.203 0.102 -0.102
.183 (4.648)
.330 - .370 (8.382 - 9.398)
.059 (1.499)
(
)
.075 (1.905) .300 (7.620) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK
.095 - .115 (2.413 - 2.921)
(
+.012 .143 -.020 +0.305 3.632 -0.508
)
.050 (1.270)
.100 (2.54) BSC
.013 - .023 (0.330 - 0.584)
.050 .012 (1.270 0.305)
.420 .420 .080 .276
.350 .205 .565
.325 .565
.320 .090 .100 .070 .100 .070 .090
M (DD3) 0204
RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE
RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS
1117fd
13
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTION
ST Package 3-Lead Plastic SOT-223
(Reference LTC DWG # 05-08-1630)
.248 - .264 (6.30 - 6.71) .114 - .124 (2.90 - 3.15) .059 MAX .129 MAX
.264 - .287 (6.70 - 7.30) .130 - .146 (3.30 - 3.71)
.248 BSC
.039 MAX
.059 MAX .090 BSC
.181 MAX .0905 (2.30) BSC .033 - .041 (0.84 - 1.04)
RECOMMENDED SOLDER PAD LAYOUT
10 - 16 .071 (1.80) MAX 10 MAX
.010 - .014 (0.25 - 0.36)
10 - 16 .024 - .033 (0.60 - 0.84) .181 (4.60) BSC .012 (0.31) MIN .0008 - .0040 (0.0203 - 0.1016)
ST3 (SOT-233) 0502
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14
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 REVISION HISTORY
REV D DATE 4/10 DESCRIPTION Updated DD-Pak part markings in Order Information section and revised all other sections.
(Revision history begins at Rev D)
PAGE NUMBER 1 to 16
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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.
15
LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATION
High Efficiency Regulator
1mH 28V INPUT 10k MR1122 10,000F 470 28V 1k 1N914 2k OUTPUT ADJUST LT1117
+
IN ADJ
OUT 240
OUTPUT
+
100F
1M 4N28 10k
+
LT1011
-
1N914
10k 28V
1117 TA15
RELATED PARTS
PART NUMBER LT1118 LT1129 LT1763 LT1764, LT1764A LT1963, LT1763A LT1965 LT3021 DESCRIPTION Low IQ, Low Dropout, 800mA, Source and Sink Regulators 700mA Micropower Low Dropout Regulator 500mA, Low Noise LDO 3A, Fast Transient Response, Low Noise LDO COMMENTS Sources and Sinks Current, 600mA Quiescent Current, Dropout Voltage: 1V, SOIC-8 and SOT-223 Packages 50A Quiescent Current 300mV Dropout Voltage, Low Noise: 20VRMS, VIN = 1.8V to 20V, SO-8 Package 340mV Dropout Voltage, Low Noise: 40VRMS, VIN = 2.7V to 20V, TO-220 and DD Packages "A" version stable also with ceramic caps
1.5A Low Noise, Fast Transient Response 340mV Dropout Voltage, Low Noise: 40VRMS, VIN = 2.5V to 20V, "A" version stable LDO with ceramic caps, TO-220, DD, SOT-223 and SO-8 Packages 1.1A, Low Noise, Low Dropout Linear Regulator 500mA, Low Voltage, VLDO Linear Regulator 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator 290mV Dropout Voltage, Low Noise: 40VRMS, VIN: 1.8V to 20V, VOUT: 1.2V to 19.5V, stable with ceramic caps, TO-220, DDPak, MSOP and 3 x 3 DFN Packages VIN: 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output (VREF = VOUT(MIN) = 200mV), Fixed Output Voltages: 1.2V, 1.5V, 1.8V, Stable with Low ESR, Ceramic Output Capacitors 16-Pin DFN (5mm x 5mm) and 8-Lead SO 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, MS8E and 3 x 3 DFN-8 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, MS8E and 2 x 3 DFN-6 packages VIN = 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80VRMS, Low IQ: 54A, Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3), 1.8V (LTC3025-4); Adjustable Output Range: 0.4V to 3.6V (LTC3025-1), 2mm x 2mm 6-Lead DFN Package VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V), VDO = 0.1V, IQ = 950A, Stable with 10F Ceramic Capacitors, 10-Lead MSOP-E and DFN-10 Packages
LT3080, LT3080-1
LT3085
500mA, Parallelable, Low Noise, Low Dropout Linear Regulator
LTC3025-1, LTC3025-2, 500mA Micropower VLDO Linear LTC3025-3, LTC3025-4 Regulator in 2 x 2 DFN LTC3026 1.5A, Low Input Voltage VLDO Linear Regulator
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16 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0410 REV D* PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1993

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