A2557SEBTR

A2557SEBTR Datasheet

A2557

Part	Datasheet
A2557SEBTR	A2557SEBTR (pdf)

Related Parts	Information
A2557KEBTR-T	A2557KEBTR-T
A2557EB-T	A2557EB-T
A2557ELB-T	A2557ELB-T
A2557KB-T	A2557KB-T
A2557KLBTR-T	A2557KLBTR-T
A2557SB-T	A2557SB-T
A2557ELBTR-T	A2557ELBTR-T
A2557SLBTR-T	A2557SLBTR-T
A2557SEBTR-T	A2557SEBTR-T
A2557EEBTR-T	A2557EEBTR-T
A2557SLB	A2557SLB
A2557SLBTR	A2557SLBTR
A2557SEB	A2557SEB
A2557SB	A2557SB
A2557ELBTR	A2557ELBTR
A2557KLB	A2557KLB
A2557KEBTR	A2557KEBTR
A2557KEB	A2557KEB
A2557ELB	A2557ELB
A2557KB	A2557KB
A2557KLBTR	A2557KLBTR
A2557EEB	A2557EEB
A2557EEBTR	A2557EEBTR
A2557EB	A2557EB

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

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

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Datasheet ID: A2557SEBTR 516012