Datasheet LT1431 (Analog Devices) - 10

LT1431
Typical applicaTions 5V Power Supply Monitor with ±500mV Window and 50mV Hysteresis Transfer Function
6 1k 6k* 1k 4k* 5 “HIGH” FOR 1N4148 OVER VOLTAGE OR UNDER VOLTAGE 4 V+ COLL V+ COLL 3 REF REF V OUT LT1431 LT1431 2 5k 5k GND-S GND-F GND-S GND-F 1 10Ω** 10Ω** *DETERMINES WINDOW SIZE V = (R – 5k)(0.5mA) 0 0 1 2 3 4 5 6 **SETS HYSTERESIS VIN LT1431 TA13 LT1431 TA14
High Efficiency Buck Converter E = 85% to 89%
1 VIN + C1 D1 220µF BAT85 BOLD LINES INDICATE HIGH CURRENT PATHS 35V *1% FILM RESISTORS 5 C1: NICHICON UPL1V221MPH VIN 4 C5 C3, C4, C5: WIMA MKS-2 VSW 0.047µF C6: NICHICON UPL1C471MPH6 LT1170 D1, D2: PHILIPS BAT85 2 D3: MOTOROLA MBR330 FB GND V L1: COILTRONICS CTX50-3-MP R1 C 470k 3 1 + C2 R2 4.7µF D4 1k C4 35V BAT85 C3 0.033µF C6 TANT 0.1µF D3 L1 0.12Ω MBR330 50µH 3A ESR + 470µF 16V 5V 2.5A D2 BAT85 R6* Q2 23.7k 2N3904 2 1 RUN = 0 SHUTDOWN > 3V COMP COLL 1 Q1 Q3 3 8 OFF V+ REF VN2222LL 2N3904 4 LT1431CN8 7 RTOP RMID R7* R3 R4 R5 R8* GND-S GND-F 24.9k 10k 100Ω 680Ω 24.9k 5 6 2 RTN NOTES: UNLESS OTHERWISE SPECIFIED 1431 TA15 1. ALL RESISTANCES ARE IN Ω, 0.25W, 5% 2. ALL CAPACITANCES ARE IN µF, 50V, 10% 3. SHUTDOWN LOGIC STATE MUST BE DEFINED BY A LOGIC GATE OR BY TYING TO GND 1431fe 10 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Schematic Diagram Package Description Revision History Package Description Related Parts