A2550KLPTRT Allegro Micro Systems, Inc., A2550KLPTRT Datasheet

A2550KLPTRT

Manufacturer Part Number

A2550KLPTRT

Description

TSSOP16

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A2550KLPTRT.pdf (15 pages)

Specifications of A2550KLPTRT

Date_code

10+

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Features and Benefits

▪ Three independent low-side DMOS output drivers

▪ Short-circuit protection of drivers

▪ Eliminates need for flyback diodes on relays

▪ Thermal shutdown

▪ Separate precision 5 V regulator (2%)

▪ Current clamp on 5 V regulator

▪ 16-pin TSSOP package with exposed thermal pad

▪ Programmable reset (NPOR) delay time

▪ Programmable watchdog

▪ Automotive voltage and temperature ranges

▪ Active clamps for automotive load dump specifications

▪ Lead (Pb) free

Package: 16 pin TSSOP (suffix LP) with

exposed pad

2550-DS, Rev. 2

Approximate Scale

System

Logic

Typical Application

0.47 μF

X7R

IN1

IN2

IN3

LGND

NPOR

WDI

VREG5

A2550

Relay Driver with 5 V Regulator

Description

Large numbers of relay-based applications require the use of a

microprocessor which implements complex system control. In

these systems, there is the need for microprocessor logic supply

voltage, power-on reset circuitry, and watchdog capabilities. The

Allegro

watchdog, and reset, as well as three low-side DMOS relay

driver outputs. Primarily targeted at automotive applications,

this IC is designed to provide robust performance over extended

voltage and temperature ranges.

Three low-side DMOS drivers can drive inductive loads, such

as relay coils. Each driver integrates rugged voltage clamps

which survive automotive load dump pulses up to 48 V. The

40 V rating on VBB also ensures adequate survival in harsh

automotive environments.

A 5 V linear regulator provides 40 mA of output current, with

a tolerance of 2% over the operating temperature range. To

enhance the usefulness of the IC in automotive applications,

the 5 V regulator output, as well as the three low-side driver

outputs are protected against overcurrent conditions.

Continued on the next page…

ENBAT

PGND

CPOR

OUT1

OUT2

OUT3

CWD

VBB

for Automotive Applications

A2550 combines the functions of voltage regulator,

Relays or other

inductive loads

A2550

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