A2557SLBTR-T

A2557SLBTR-T Datasheet


A2557

Part Datasheet
A2557SLBTR-T A2557SLBTR-T A2557SLBTR-T (pdf)
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PDF Datasheet Preview
A2557

Protected Quad Driver with Fault Detection and Sleep Mode
300 mA output current per channel Independent overcurrent protection and thermal limiting
for each driver Output voltage to 60 V Output SOA protection Fault-detection circuitry for open or shorted load Low quiescent current Sleep Mode Integral output flyback/clamp diodes TTL- and 5 V CMOS-compatible inputs

Packages:

Package B, 16-pin DIP with exposed tabs

Package EB, 28-pin PLCC with internally fused pins

The A2557 has been specifically designed to provide costeffective solutions to relay-driving applications with up to 300 mA drive current per channel. They may also be used for driving incandescent lamps in applications where turn-on time is not a concern. Each of the four outputs will sink 300 mA in the on state. The outputs have a minimum breakdown voltage of 60 V and a sustaining voltage of 40 V. A low-power Sleep Mode is activated with either ENABLE low or all inputs low. In this mode, the supply current drops to below 100 uA.

Overcurrent protection for each channel has been designed into these devices and is activated at a nominal 500 mA. It protects each output from short circuits with supply voltages up to 32 V. When an output experiences a short circuit, the output current is limited at the 500 mA current clamp. In addition, foldback circuitry decreases the current limit if an excessive voltage is present across the output and assists in keeping the device within its SOA safe operating area . An exclusive-OR circuit compares the input and output state of each driver. If either a short or open load condition is detected, a single FAULT output is turned on active low .

Not to scale

Package LB, 16-pin SOIC with internally fused pins

Continued on the next

Functional Block Diagram

ENABLE IN N

SLEEP CONTROL

COMMON CONTROL ONE OF FOUR DRIVERS
60 A V

THERMAL LIMIT

CURRENT LIMIT

FAULT K

OUTN 30 A
29317.16L

A2557

Protected Quad Driver with Fault Detection and Sleep Mode

Description continued Continuous or multiple overload conditions causing the channel temperature to reach approximately 165°C will result in an additional linear decrease in the output current of the affected driver. If the fault condition is corrected, the output stage will return to its normal saturated condition.

The packages offer fused leads for enhanced thermal dissipation. Package B is a 16-pin power DIP with exposed tabs, EB is a 28lead power PLCC, and LB is a 16-lead power wide-body SOIC for surface-mount applications. The lead Pb free versions have 100% matte tin leadframe plating.

Selection Guide

Pb-free

Package

Packing

Ambient Temperature °C

A2557EB-T*
16-pin DIP, exposed tabs
25 pieces per tube

A2557EEBTR-T*
28-lead PLCC
800 pieces per reel
to 85

A2557ELBTR-T*
16-lead SOIC
1000 pieces per reel
More datasheets: CRP0603-BZ-1001ELF | CRP0603-BZ-4641ELF | B88069X3810C103 | A2557KEBTR-T | A2557EB-T | A2557ELB-T | A2557KB-T | A2557KLBTR-T | A2557SB-T | A2557ELBTR-T


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Datasheet ID: A2557SLBTR-T 516012