L4964_03 Datasheet, PDF (1/13 Pages) STMicroelectronics – HIGH CURRENT SWITCHING REGULATOR

®
L4964
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
MULTIWATT15 Vertical
(Plastic Package)
ORDERING NUMBER : L4964
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.
PIN CONNECTION (top view)
MULTIWATT15 Horizontal
(Plastic Package)
ORDERING NUMBER : L4964HT
July 2003
Pins 1, 4, 15 must not be connected. Leave open circuit.
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