LT1431C Linear Technology, LT1431C Datasheet

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LT1431C

Manufacturer Part Number
LT1431C
Description
Programmable Reference
Manufacturer
Linear Technology
Datasheet

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A
FEATURE
TYPICAL
PPLICATI
Linear Regulators
Adjustable Power Supplies
Switching Power Supplies
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
+
V
IN
REGULATOR
SWITCHING
S
A
O
PPLICATI
U
S
O
U
+
Isolated 5V Regulator
COLL
GND-F
The LT1431 is an adjustable shunt voltage regulator with
100mA sink capability, 0.4% initial reference voltage tol-
erance, 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 exter-
nal resistor.
A simplified three pin version, the LT1431Z/IZ, is available
for applications as an adjustable reference and is pin
compatible with the TL431.
D
ESCRIPTIO
Programmable Reference
LT1431
COMP
4mA/V
gm =
U
V
+
+
GND-S
2.5V
R
LT1431 • TA01
TOP
REF
R
5V
MID
LT1431
1

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LT1431C Summary of contents

Page 1

FEATURE S 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 O U PPLICATI S A Linear Regulators Adjustable Power Supplies Switching Power Supplies O U TYPICAL ...

Page 2

... Dynamic Impedance KA I Collector Current Limit LIM 5V Reference Output The denotes specifications which apply over the operating temperature range. Note the cathode voltage of the LT1431CZ/IZ and corresponds the LT1431CN8/MJ8 the cathode current of the LT1431CZ/ and corresponds to I the LT1431CN8/MJ8/IN8. ...

Page 3

W U TYPICAL PERFOR A 2.5V Reference 1000 900 800 700 I MIN 600 500 400 300 200 100 0 0 0.5 1.0 1.5 2.5 3.0 2 and ...

Page 4

LT1431 W U TYPICAL PERFOR A Voltage Gain and Phase vs Frequency 140 PHASE 120 100 –20 100 1k 10k 100k FREQUENCY (Hz) Transconductance and Phase vs Frequency (Ref to Comp ...

Page 5

CTIO S COLL (Pin 1): Open collector of the output transistor. The maximum pin voltage is 26V. The saturation voltage at 100mA is approximately 1V. COMP (Pin 2): Base of the driver for the output ...

Page 6

LT1431 U U APPLICATIO S I FOR ATIO Frequency Compensation As a shunt regulator, the LT1431 is stable for all capacitive loads on the COLL pin. Capacitive loading between 0.01 F and 18 F causes reduced phase margin with some ...

Page 7

TYPICAL APPLICATIO Measured Dropout Voltages I MTP50N05EL MTM25N05L LOAD 2A 47mV 1A 22mV 0.5A 11.5mV U PNP Low Dropout 5V Regulator* 0 2N2219 0.015 F 150 2 1 COMP COLL 3 ...

Page 8

LT1431 TYPICAL APPLICATIO S 12V to 5V Buck Converter with Foldback Current Limit* PULSE ENGINEERING #PE-51515 OUT LT1089 HI-SIDE SWITCH MBR735 LOGIC IN GND 5k 1500pF 2 1 COMP COLL REF ...

Page 9

... FILM RESISTORS C1 = NICHICON-UPL1V221MPH C6 = NICHICON-UPL1C471MPH6 D1 PHILIPS-BAT85 D3 = MOTORALA-MBR330 L1 = COILTRONICS CTX50-3-MP C3, C4 WIMA-MKS-2 C6 0.12m D3 470 F ESR L1 + MBR330 16V COMP COLL REF VR2 LT1431CN8 MID TOP GND-S GND LT1431 5 6 LT1431 • TA14 5V 2.5A R6* 23.7k R7* 24.9k LT1431 • TA15 9 ...

Page 10

LT1431 W SCHE ATIC DIAGRA 35k 35k REF R6 8. TOP MID 10X GND-SENSE 10 W Q13 ...

Page 11

... 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 represen- tation that the interconnection of circuits as described herein will not infringe on existing patent rights. U Dimensions in inches (millimeters) unless otherwise noted. ...

Page 12

... BSC SO8 0392 0.060 ± 0.010 (1.524 ± 0.254) 0.140 ± 0.010 (3.556 ± 0.127) 10° NOM Z3 1191 LT/GP1292 5K REV B LINEAR TECHNOLOGY CORPORATION 1992 ...

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