A2557KB, A2557KEB, A2557KLB have been specifically designed provide co

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PROTECTED QUAD LOW-SIDE DRIVER WITH SLEEP MODE FAULT DETECTION
A2557KB, A2557KEB, A2557KLB have been specifically designed provide cost-effective solutions relay-driving applications with drive current channel. Each device used driving incandescent lamps applications where turn-on time concern. Each four outputs will sink state. outputs have minimum breakdown voltage sustaining voltage low-power Sleep Mode activated with either ENABLE inputs this mode, supply current drops below Over-current protection each channel been designed into these devices activated nominal protects each output from short circuits with supply voltages When output experiences short circuit, output current limited current clamp. addition, foldback circuitry decreases current limit excessive voltage present across output assists keeping device within (safe operating area). exclusive-OR circuit compares input output state each driver. either short open load condition detected, single FAULT output turned (active low). Similar devices, operation available UDx2547B/EB. Continuous multiple overload conditions causing channel temperature reach approximately 165°C will result additional linear decrease output current affected driver. fault condition corrected, output stage will return normal saturated condition. suffix devices 16-pin power DIPs; suffix `EB' devices 28-lead power PLCCs suffix `LB' 16-lead power SOICs surfacemount applications. packages batwing construction provide maximum package power dissipation.
Data Sheet 29317.16
PROTECTED QUAD LOW-SIDE DRIVER WITH SLEEP MODE FAULT DETECTION
A2557KLB
OUT4 OUT3 GROUND GROUND OUT2 FAULT OUT1
Note that A2557KB (DIP) A2557KLB (SOIC) electrically identical share common terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Output Voltage, VOUT Over-Current Protected Output Voltage, VOUT Output Current, IOUT FAULT Output Voltage, Logic Supply Voltage, Input Voltage, VENABLE Package Power Dissipation, Graph Operating Temperature Range, -40°C +125°C Junction Temperature, +150°C* Storage Temperature Range, -55°C +150°C
*Outputs current limited approximately driver junction temperature limited higher current attempted.
ENABLE GROUND GROUND
Dwg. PP-017-4
FEATURES Output Current Channel Independent Over-Current Protection &Thermal Limiting Each Driver Output Voltage Output Protection Fault-Detection Circuitry Open Shorted Load Quiescent Current Sleep Mode Integral Output Flyback/Clamp Diodes TTL- CMOS-Compatible Inputs Replace UDx2543B, UDx2549B/EB, UDx2559B/LB (FAULT output
must shorted terminal compatibility) Low-Current Applications
This document contains information product under development. Allegro MicroSystems, Inc. reserves right change discontinue this product without notice.
PROTECTED QUAD LOW-SIDE DRIVER WITH SLEEP MODE FAULT DETECTION
FUNCTIONAL BLOCK DIAGRAM
FAULT ENABLE SLEEP CONTROL
COMMON CONTROL FOUR DRIVERS
THERMAL SHUTDOWN CURRENT LIMIT
OUTN
Dwg. FP-007-2
A2557KEB
CONNECTION
TRUTH TABLE
ENABLE
Status Normal Load Sleep Mode
GROUND
ENABLE
OUTN
FAULT
OUT2
OUT1
GROUND GROUND
Over-Current Short Supply Thermal Fault Open Load Short Ground
Don't care. Linear drive, current limited.
GROUND
Dwg. PP-019-2
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements design products. Components made under military approvals will accordance with approval requirements. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties which result from use.
CONNECTION
FAULT
SUPPLY
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1997, Allegro MicroSystems, Inc.

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