L4964

July 2003

HIGH CURRENT SWITCHING REGULATOR

®

.

4 A OUTPUT CURRENT

.

5.1 V TO 28 V OUTPUT VOLTAGE RANGE

.

0 TO 100 % DUTY CYCLE RANGE

.

PRECISE (

± 3 %) ON-CHIP REFERENCE

.

SWITCHING FREQUENCY UP TO 120 KHz

.

VERY HIGH EFFICIENCY (UP TO 90 %)

.

VERY FEW EXTERNAL COMPONENTS

.

SOFT START

.

RESET OUTPUT

.

CURRENT LIMITING

.

INPUT FOR REMOTE INHIBIT AND SYN-

CHRONUS PWM

.

THERMAL SHUTDOWN

DESCRIPTION

The L4964 is a stepdown power switching regulator

delivering 4A at a voltage variable from 5.1V to 28V.

Features of the device include overload protection,

soft start, remote inhibit, thermal protection, a reset

output for microprocessors and a PWM comparator

input for synchronization in multichip configurations.

The L4964 is mounted in a 15-lead Multiwatt

® plas-

tic power package and requires very few external

components.

Efficient operation at switching frequencies up to

120kHz allows a reduction in the size and cost of ex-

ternal filter components.

MULTIWATT15 Vertical

(Plastic Package)

ORDERING NUMBER : L4964

MULTIWATT15 Horizontal

(Plastic Package)

ORDERING NUMBER : L4964HT

Pins 1, 4, 15 must not be connected. Leave open circuit.

PIN CONNECTION (top view)

1/13