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LT1431 Programmable Reference FeaTures
n n n n n n
DescripTion
The LT(R)1431 is an adjustable shunt voltage regulator with 100mA sink capability, 0.4% initial reference voltage tolerance and 0.3% typical temperature stability. On-chip divider resistors allow the LT1431 to be configured as a 5V shunt regulator, with 1% initial voltage tolerance and requiring no additional external components. By adding two external resistors, the output voltage may be set to any value between 2.5V and 36V. The nominal internal current limit of 100mA may be decreased by including one external resistor. A simplified 3-pin version, the LT1431CZ/LT1431IZ, is available for applications as an adjustable reference and is pin compatible with the TL431.
Guaranteed 0.4% Initial Voltage Tolerance 0.1 Typical Dynamic Output Impedance Fast Turn-On Sink Current Capability, 1mA to 100mA Low Reference Pin Current Available in J8, N8, S8 or 3-Lead TO-92 Z Packages
applicaTions
n n n
Linear Regulators Adjustable Power Supplies Switching Power Supplies
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.
Typical applicaTion
Isolated 5V Regulator + +
SWITCHING REGULATOR 5V
VIN
VREF vs Temperature
2.5025 2.5000
-
VREF (V) 5V RTOP V+ COMP COLL
2.4975 2.4950 2.4925
REF
+ -
2.5V LT1431 GND-S GND-F
LT1431 TA01
gm = 4mA/V
2.4900 2.4875 -50 -25
RMID
50 25 75 0 TEMPERATURE (C)
100
125
LT1431 TA01b
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LT1431 absoluTe MaxiMuM raTings
(Note 1)
V+, VCOLLECTOR..........................................................36V VCOMP, RTOP, RMID, VREF .............................................6V GND-F to GND-S ......................................................0.7V Ambient Temperature Range LT1431M ............................................ -55C to 125C LT1431I ................................................-40C to 85C LT1431C ..................................................0C TO 70C
Junction Temperature Range LT1431M ............................................ -55C to 150C LT1431I .............................................. -40C to 100C LT1431C ................................................. 0C to 100C Storage Temperature Range .................. -65C to 150C Lead Temperature (Soldering, 10 sec)................... 300C
pin conFiguraTion
TOP VIEW COLLECTOR 1 COMP 2 V
+
TOP VIEW 8 REF 7 RMID 6 GND-F 5 GND-S COLLECTOR 1 COMP 2 V
+
8 REF 7 RMID 6 GND-F 5 GND-S
3
3
RTOP 4
RTOP 4
J8 PACKAGE 8-LEAD CERDIP TJMAX = 150C, JA = 100C/W TOP VIEW COLLECTOR 1 COMP 2 V+ 3 8 7 6 5 REF RMID GND-F GND-S
N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 100C, JA = 130C/W BOTTOM VIEW
REF ANODE CATHODE
RTOP 4
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 100C, JA = 170C/W
Z PACKAGE 3-LEAD TO-92 PLASTIC TJMAX = 100C, JA = 150C/W
orDer inForMaTion
LEAD FREE FINISH LT1431CN8#PBF LT1431IN8#PBF LT1431CS8#PBF LT1431IS8#PBF LT1431MJ8#PBF LT1431CZ#PBF LT1431IZ#PBF TAPE AND REEL LT1431CN8#TRPBF LT1431IN8#TRPBF LT1431CS8#TRPBF LT1431IS8#TRPBF LT1431MJ8#TRPBF LT1431CZ#TRPBF LT1431IZ#TRPBF PART MARKING LT1431 CN8 LT1431 IN8 LT1431 LT1431I LT1431 MJ8 LT1431 CZ LT1431 IZ PACKAGE DESCRIPTION 8-Lead Plastic DIP 8-Lead Plastic DIP 8-Lead Plastic SO 8-Lead Plastic SO 8-Lead CERDIP 3-Lead TO-92 Plastic 3-Lead TO-92 Plastic TEMPERATURE RANGE 0C to 70C -40C to 85C 0C to 70C -40C to 85C -55C to 125C 0C to 70C -40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. 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/
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LT1431 elecTrical characTerisTics
SYMBOL VREF VREF/T PARAMETER Reference Voltage Reference Drift
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. IK = 10mA unless otherwise specified (Note 2)
LT1431I, LT1431M CONDITIONS VKA = 5V, IK = 2mA, (Note 3)
l
LT1431C MIN TYP MAX UNITS V V ppm/C 0.5 1.0 1.2 1.0 1 2 1 2 0.2 100 260 mV/V A A mA A A A A mA V
MIN
TYP
MAX
2.490 2.500 2.510 2.490 2.500 2.510 2.465 2.535 2.480 2.520 50 0.2 0.2 0.5 1.0 1.5 1.0 1 15 1 5 0.2 80 360 30 0.2 0.2 0.6
VKA = 5V, IK = 2mA IK = 2mA, VKA = 3V to 36V VKA = 5V, TA = 25C
l l
VREF/VKA Voltage Ratio, Reference to Cathode (Open-Loop Gain) |IREF| IMIN |IOFF| |ILEAK| |ZKA| ILIM Reference Input Current Minimum Operating Current Off-State Cathode Current
l
VKA = VREF to 36V VKA = 36V, VREF = 0V
l
0.6
Off-State Collector Leakage Current VCOLL = 36V, V+ = 5V, VREF = 2.4V
l
Dynamic Impedance Collector Current Limit 5V Reference Output
VKA = VREF, IK = 1mA to 100mA, f 1kHz VKA = VREF + 50mV Internal Divider Used, IK = 2mA
l
4.950 5.000 5.050 4.950 5.000 5.050
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: VKA is the cathode voltage of the LT1431CZ/IZ and corresponds to V+ of the LT1431CN8/IN8/CS8/IS8. IK is the cathode current of the
COLLECTOR of the LT1431CN8/ IN8/CS8/IS8. Note 3: The LT1431 has bias current cancellation which is effective only for VKA 3V. A slight (2mV) shift in reference voltage occurs when VKA drops below 3V. For this reason, these tests are not performed at VKA = VREF.
LT1431CZ/IZ and corresponds to I(V+) + I
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LT1431 Typical perForMance characTerisTics
1000 900 800 700 IK (A) 600 500 IMIN VREF (V)
2.5V Reference IK vs VKA
2.505 2.504 2.503 2.502 2.501 2.500 2.499 2.498 2.497 2.496
VREF and IREF vs V +
3.5 3.0 2.5 2.0
2.505 2.504 2.503 2.502 VREF (V) 2.501 2.500 2.499 2.498 2.497 2.496 2.495 IREF (A)
VREF and IREF vs V +
3.5 3.0 2.5 2.0 1.5 IREF (A)
VREF IREF
1.5 1.0 0.5 0
400 300
VREF
1.0 0.5 0
200 100 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VKA (V)
LT1431 TPC01
-0.5 -1.0
IREF
-0.5 -1.0
-1.5 2.495 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 + (V) V
LT1431 TPC02
0
4
8
12 16 20 24 28 32 36 40 V+ (V)
LT1431 TPC03
-1.5
2.5025 2.5000 2.4975 VREF (V) 2.4950 2.4925 2.4900
VREF and IREF vs Temperature
VREF
ILIMIT vs Temperature with External Resistor
1.00 0.66 ILIMIT (NORMALIZED) 0.33 IREF (A) 1.250 ILIMIT = 1.125 1.000 0.875 0.750 0.625 0.500 -50 -25 VSAT (V) 0.7 AT 25C RLIM + 3.6 1.20 1.00 0.80 0.60
COLLECTOR VSAT vs Temperature vs Current
ICOLL = 100mA
IREF
0
ICOLL = 50mA 0.40 0.20 0 -50 -25 ICOLL = 20mA ICOLL = 10mA 50 25 75 0 TEMPERATURE (C) 100 125
-0.33 -0.66 -1.00 125
2.4875 -50 -25
50 25 75 0 TEMPERATURE (C)
100
LT1431 TPC04
50 25 75 0 TEMPERATURE (C)
100
125
LT1431 TPC05
LT1431 TPC06
Propagation Delay vs Overdrive
150 135 PROPAGATION DELAY (s) 120 105 90 75 60 45 30 15 0 0 50 OUTPUT HIGH-TO-LOW OUTPUT LOW-TO-HIGH 150 100 OVERDRIVE (mV) 200 250
VREF OVERDRIVE 5V 1k 3 LT1431 5 6 1 OUTPUT
Voltage Gain and Phase vs Frequency
140 120 REF-TO-COLL 1k LOAD AV (dB) 100 80 60 40 20 0 -20 100 1k 10k 100k FREQUENCY (Hz) 1M AV PHASE 180 135
1010 109 REF-TO-COLL gm ( ) 108 107 106 105 104 103
Transconductance and Phase vs Frequency (REF to COLL)
180 135 PHASE 90 45 0 -45 -90 -135 1k 10k 100k FREQUENCY (Hz) 1M -180 10M PHASE (DEG)
90 45 0 -45 -90 -135 -180 10M PHASE (DEG)
gm
102 100
LT1431 TPC07
LT1431 TPC08
LT1431 TPC09
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LT1431 Typical perForMance characTerisTics
104
Transconductance and Phase vs Frequency (Ref to Comp)
PHASE gm 20 0 -20 ZKA ( ) -40 PHASE (DEG) 1.4 1.2 1.0 0.8 0.6 0.4 0.2
Dynamic Impedance vs Frequency
IK 100mA 3.0 2.5 2.0 VCOMP (V) 1.5 1.0 0.5
VCOMP vs Temperature vs ICOLL
REF-TO-COLL gm ( )
3
103
ICOLL = 100mA ICOLL = 10mA
103
-60 -80
3
102
-100 -120
0.1 100
1k
10k 100k FREQUENCY (Hz)
1M
-140 10M
0 100
LT1431 TPC10
1k 10k FREQUENCY (Hz)
100k
LT1431 TPC11
0 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
LT1431 TPC12
ICOMP vs VCOMP vs VREF
600 500 NOISE (nV/Hz) 400 ICOMP (A) 300 200 VREF = 2.53V 100 0 0 VREF = 5V VREF = 4V VREF = 3V 1000
Noise vs Frequency
0.1Hz to 10Hz Noise
500
0
0.5
1.0
1.5 2.0 VCOMP (V)
2.5
3.0
3.5
NOISE VOLTAGE (50V/DIV)
1
10
100 1k FREQUENCY (Hz)
10k
100k
LT1431 G14
0
1
LT1431 TPC13
4 3 2 TIME (MINUTES)
5
6
LT1431 TPC15
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LT1431 pin FuncTions
COLL (Pin 1): Open collector of the output transistor. The maximum pin voltage is 36V. The saturation voltage at 100mA is approximately 1V. COMP (Pin 2): Base of the driver for the output transistor. This pin allows additional compensation for complex feedback systems and shutdown of the regulator. It must be left open if unused. V + (Pin 3): Bias voltage for the entire shunt regulator. The maximum input voltage is 36V and the minimum to operate is equal to VREF (2.5V). The quiescent current is typically 0.6mA. RTOP (Pin 4): Top of the on-chip 5k-5k resistive divider that guarantees 1% accuracy of operation as a 5V shunt regulator with no external trim. The pin is tied to COLL for self-contained 5V operation. It may be left open if unused. See note on parasitic diodes below. GND-S (Pin 5): Ground reference for the on-chip resistive divider and shunt regulator circuitry except for the output transistor. This pin allows external current limit of the output transistor with one resistor between GND-F (force) and GND-S (sense). GND-F (Pin 6): Emitter of the output transistor and substrate connection for the die. RMID (Pin 7): Middle of the on-chip resistive divider string between RTOP and GND-S. The pin is tied to REF for selfcontained 5V operation. It may be left open if unused. REF (Pin 8): Control pin of the shunt regulator with a 2.5V threshold. If V+ > 3V, input bias current cancellation reduces IB to 0.2A typical. COMP RTOP, RMID, and REF have static discharge protection , circuits that must not be activated on a continuous basis. Therefore, the absolute maximum DC voltage on these pins is 6V, well beyond the normal operating conditions. As with all bipolar ICs, the LT1431 contains parasitic diodes which must not be forward biased or else anomalous behavior will result. Pin conditions to be avoided are RTOP below RMID in voltage and any pin below GND-F in voltage (except for GND-S). The following pin definitions apply to the Z package. CATHODE: Corresponds to COLL and V+ tied together. ANODE: Corresponds to GND-S and GND-F tied together. REF: Corresponds to REF .
block DiagraM
RTOP 4 5k REF 8 V + 3 COMP 2 COLLECTOR 1
+ -
5k 2.5V gm = 4mA/V
RMID
7
5 GND-SENSE
6 GND-FORCE
LT1431 BD
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LT1431 applicaTions inForMaTion
Frequency Compensation As a shunt regulator, the LT1431 is stable for all capacitive loads on the COLL pin. Capacitive loading between 0.01F and 18F causes reduced phase margin with some ringing under transient conditions. Output capacitors should not be used arbitrarily because output noise is not necessarily reduced. Excess capacitance on the REF pin can introduce enough phase shift to induce oscillation when configured as a reference >2.5V. This can be compensated with capacitance between COLL and REF (phase lead). More complicated feedback loops may require shaping of the frequency response of the LT1431 with dominant pole or pole-zero compensation. This can be accomplished with a capacitor or series resistor and capacitor between COLL and COMP . The compensation schemes mentioned above use voltage feedback to stabilize the circuits. There must be voltage gain at the COLL pin for them to be effective, so the COLL pin must see a reasonable AC impedance. Capacitive loading of the COLL pin reduces the AC impedance, voltage gain, and frequency response, thereby decreasing the effectiveness of the compensation schemes, but also decreasing their necessity.
Typical applicaTions
2.5V Reference 3-Pin Package
VIN RL 2.5V CATHODE LT1431Z REF GND-S
LT1431 TA02
2.5V Reference 8-Pin Package
VIN V+ LT1431 RL 2.5V COLL REF VIN V+ RTOP
5V Reference
RL 5V COLL LT1431 REF RMID GND-F
LT1431 TA04
ANODE
GND-F
LT1431 TA03
GND-S
Increasing 5V Reference
VIN R V+ RTOP GND-S LT1431 RL 5V + COLL REF RMID GND-F
LT1431 TA05
Programmable Reference with Adjustable Current Limit
VIN V+ LT1431 GND-S RLIM RL VOUT = 1 + R1 VREF R2 COLL REF R2 GND-F ILIMIT = 0.7 AT 25C RLIM + 3.6
LT1431 TA06
R1
()
= R * (0.5mA) 25% PROCESS TOLERANCE 500mV
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LT1431 Typical applicaTions
PNP Low Dropout 5V Regulator*
VIN 0.1F 20 ** 2W 1k 150 2 COMP V+ RTOP GND-S 5 LT1431 0.015F 1 COLL REF RMID GND-F 6 2N2219 47 MJE2955
3 4
8 7
MEASURED DROPOUT VOLTAGE 420mV AT 4A 190mV AT 2A 95mV AT 1A 60mV AT 0.5A *NO SHORT-CIRCUIT PROTECTION **MAY BE INCREASED AT LOWER WATTAGE FOR LOWER OUTPUT CURRENTS
+
5V 330F
LT1431 TA07
FET Low Dropout 5V Regulator with Current Limit
12V MTP50N05EL MTM25N05L 0.002 *
VIN 5.2V
+
D 47F G
S
-
1.5k 7
2 LT1006 LT1006
+
3 4
+
5V, 2.5A 47F
5 1N4148 1 COLL V+ RTOP GND-S 5 LT1431 REF RMID GND-F 6
LT1431 * TA08
6
Measured Dropout Voltages
ILOAD 2A 1A 0.5A MTP50N05EL 47mV 22mV 11.5mV MTM25N05L 145mV 73mV 37mV
3 4
8 7
*1.5" #23 SOLID COPPER WIRE ~0.002 3A LIMIT
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LT1431 Typical applicaTions
12V to 5V Buck Converter with Foldback Current Limit*
PULSE ENGINEERING #PE-51515 VIN VIN VOUT LT1089 HI-SIDE SWITCH GND MBR735 80 VIN = 9V VIN = 12V
Buck Converter Efficiency
70 EFFICIENCY (%) 100 0.5W 60
LOGIC IN
VIN = 15V 50
5k 2 COMP V+ RTOP GND-S 5 LT1431
1500pF 1 COLL REF RMID
40 8 7 30 0 1 2 3 4 ILOAD (A) 5 6 7 8
3 4
GND-F 6
LT1431 TA10
*CONTACT LTC FOR HIGH EFFICIENCY SWITCHING REGULATORS
+
5V, 7A 3300F
LT1431 TA09
Isolated 5V to 15V Flyback Converter
COILTRONICS CTX02-11934 4.5V TO 5.5V 0.47F 3k MUR105 6, 7 9 MUR105 -15V, 70mA C* 15k
Fully Loaded Output Ripple vs Filtering
C* LT1172 30mVP-P LT1072 40mVP-P
+
210F
*
4, 5
*
2 10
+
50F
VIN
LT1172 OR LT1072
VOUT
GND
VC 1
*
MUR105
+
1.5k 4N36 MEASURED EFFICIENCY LT1172 67.8% AT 2.2WOUT LT1072 68.6% AT 2.2WOUT LT1071 61.1% AT 4.4WOUT 0.68F 2.4k 0.1F 1 20k 2 COLL LT1431 COMP GND-S 5
+
L*
+
100F
+
100F
6mVP-P
8mVP-P
*L BELL INDUSTRIES J.W. MILLER DIVISION 9310-36 10H, 450mA 15V, 70mA C*
LT1431 TA12
3 V+ 8 REF
13.3k
2.7k
GND-F 6
LT1431 TA11
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LT1431 Typical applicaTions
5V Power Supply Monitor with 500mV Window and 50mV Hysteresis
6 1k 6k* 1N4148 1k 4k* 5 4 VOUT 3 2 1 0
Transfer Function
"HIGH" FOR OVER VOLTAGE OR UNDER VOLTAGE
V+ LT1431 GND-S
COLL REF 5k
V+ LT1431 GND-S
COLL REF 5k
GND-F 10 **
GND-F
10 ** *DETERMINES WINDOW SIZE V = (R - 5k)(0.5mA) **SETS HYSTERESIS
LT1431 TA13
0
1
2
3 VIN
4
5
6
LT1431 TA14
High Efficiency Buck Converter E = 85% to 89%
VIN 1
+
C1 220F 35V
D1 BAT85 5 4 VSW LT1170 2 FB GND VC 3 D4 BAT85 1 R2 1k C3 0.1F C4 0.033F VIN C5 0.047F
R1 470k
BOLD LINES INDICATE HIGH CURRENT PATHS *1% FILM RESISTORS C1: NICHICON UPL1V221MPH C3, C4, C5: WIMA MKS-2 C6: NICHICON UPL1C471MPH6 D1, D2: PHILIPS BAT85 D3: MOTOROLA MBR330 L1: COILTRONICS CTX50-3-MP
+
C2 4.7F 35V TANT
D2 BAT85 Q2 2N3904 Q1 VN2222LL Q3 2N3904 2 COMP 1
OFF
1
RUN = 0 SHUTDOWN > 3V
R3 10k RTN 2
R4 100
R5 680
R8* 24.9k
COLL 3+ 8 V REF LT1431CN8 4 7 RTOP RMID GND-S GND-F 5 6
NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTANCES ARE IN , 0.25W, 5% 2. ALL CAPACITANCES ARE IN F, 50V, 10% 3. SHUTDOWN LOGIC STATE MUST BE DEFINED BY A LOGIC GATE OR BY TYING TO GND
0
+
D3 L1 MBR330 50H 3A
0.12 ESR
C6 470F 16V
5V 2.5A R6* 23.7k
R7* 24.9k
1431 TA15
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LT1431 scheMaTic DiagraM
Q5 R1 35k R2 35k 4X Q7 3X Q13 3 Q17 V +
Q1
Q2
Q3
Q11
Q10
Q12 COMP 2
Q6 2X 8 REF Q9 5X R11 11k R7 2.5k R3 5k R MID 7 R9 2.5k Q14
C1 22pF
R12 1k R15 5k R13 6.5k
C3 6pF R17 1.5k C4 1pF
COLLECTOR 1
R6 8.5k Q4
C2 65pF
Q20 2X Q22 45X
RTOP
4
Q18 Q19 Q15 Q16 R10 340 R21 100k R16 11 R14 11
Q8 10X
R20 5k Q21 2.5X
R4 5k GND-SENSE 5
R5 5k
R8 600
R18 50k
R19 3.6 6 GND-FORCE
LT1431 SD01
package DescripTion
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.405 (10.287) MAX 8 7 6 5
.300 BSC (7.62 BSC)
CORNER LEADS OPTION (4 PLCS)
.200 (5.080) MAX .015 - .060 (0.381 - 1.524)
.005 (0.127) MIN
.008 - .018 (0.203 - 0.457)
0 - 15
.023 - .045 (0.584 - 1.143) HALF LEAD OPTION .045 - .068 (1.143 - 1.650) FULL LEAD OPTION
.025 (0.635) RAD TYP 1 2 3 4
.220 - .310 (5.588 - 7.874)
J8 0801
.045 - .065 (1.143 - 1.651) .014 - .026 (0.360 - 0.660) .100 (2.54) BSC
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
.125 3.175 MIN
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LT1431 package DescripTion
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5
.300 - .325 (7.620 - 8.255)
.045 - .065 (1.143 - 1.651)
.130 .005 (3.302 0.127)
.008 - .015 (0.203 - 0.381)
.065 (1.651) TYP
.255 .015* (6.477 0.381) .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
(
+.035 .325 -.015 8.255 +0.889 -0.381
)
1
2
3
4
N8 1002
.100 (2.54) BSC
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.045 .005
8 .189 - .197 (4.801 - 5.004) NOTE 3 7 6 5
.050 BSC
.245 MIN
.160 .005
.228 - .244 (5.791 - 6.197)
.150 - .157 (3.810 - 3.988) NOTE 3
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508)
.008 - .010 (0.203 - 0.254) 0- 8 TYP
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
.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
.050 (1.270) BSC
SO8 0303
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LT1431 revision hisTory
REV D DATE 4/10 DESCRIPTION M-Grade Parts Re-Released. Obsolete Package Shading Removed
(Revision history begins at Rev D)
PAGE NUMBER 2, 11
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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.
LT1431 package DescripTion
Z Package 3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410 Rev C)
.180 (4.572 .005 0.127)
.060 .005 (1.524 0.127) DIA
.180 (4.572
.005 0.127)
.90 (2.286) NOM
.500 (12.70) MIN
.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX
5 NOM
.050 (1.27) BSC BULK PACK
.016 (0.406
.003 0.076)
.015 (0.381
.002 0.051)
Z3 (TO-92) 1008 REV C
.098 +.016/-.04 (2.5 +0.4/-0.1) 2 PLCS TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION
.060 (1.524
.010 0.254)
3
2
1
.140 (3.556
.010 0.127)
10 NOM
relaTeD parTs
PART NUMBER LTC 3722
(R)
DESCRIPTION Synchronous Full-Bridge Controller Synchronous Push-Pull PWM Controller SOT-23 Flyback Controller Synchronous Flyback Controller Opto-Coupler Driver in SOT-23
COMMENTS Zero Voltage Switching, Adjustable 2VS Timing 1.5A Sink, 1A Source Output Drivers, Adjustable Dead Time Adjustable Slope Compensation, 200kHz Operation Excellent Cross Regulation, High Efficiency Overshoot Control, 600mV Reference, High Bandwidth Error Amplifier
LTC3723 LTC3803 LTC3806 LT4430
LTC3900/LTC3901 Synchronous Rectifiers for Forward and Push-Pull Converters Programmable Time Out, Reverse Inductor Current Sense
1431fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LT 0410 REV D * PRINTED IN USA
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1992

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