2 INDEPENDENTLY CONTROLLED

H-BRIDGES

0.8A DC CURRENT WITHOUT HEAT SINK

µA

THEMAL PROTECTION

CROSS CONDUCTION PROTECTION

SUPPLY VOLTAGE UP TO 40V

CMOS COMPATIBLE INPUTS

OUTPUT SHORT-CIRCUIT PROTECTION

DESCRIPTION

The L9925 is a dual full bridge driver for stepper

motor applications. Realized in BCD (Bipolar,

CMOS & DOS) techology, logic circuits, precise

linear blocks and power transistors are combined

to optimize circuit performance and minimize off

chip components. Schmitt triggers are used for all

input stages and are fully compatible with 5V

CMOS logic levels. When both enable signals are

low, the IC is commanded to a low quiescent cur-

rent state and will draw less than 200

µA from the

battery.

The charge pump is integrated on chip; no exter-

nal components are required. Full performance is

tionally but with relaxed performance. Over tem-

perature protection and ESD protection to all pins

ensures relability and reduces system integration

failures.

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March 1999

®

CHARGE

PUMP

TEMP

OUT1

VS1

OUT2

IN2

PGND1

VS2

OUT3

OUT4

IN1

EN1

GND

EN2

IN3

IN4

2nd FULL BRIDGE

1st FULL BRIDGE

5V

REGULATOR

EN1

EN1

EN1

EN2

40V

7V

7V

7V

T1

T1

T2

T2

T1 T2

CHARGE

PUMP

D99AT423

BLOCK DIAGRAM

SO28

ORDERING NUMBER: L9925

L9925

DMOS DUAL FULL BRIDGE DRIVER

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