L4964
HIGH CURRENT SWITCHING REGULATOR
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4 A OUTPUT CURRENT
5.1 V TO 28 V OUTPUT VOLTAGE RANGE
0 TO 100 % DUTY CYCLE RANGE
PRECISE (鹵 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
MUL TIW AT T15 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廬 plas-
tic power package and requires very few external
components.
Efficient operation at switching frequencies up to
120kHz allows a reductionin the size and cost of ex-
ternal filter components.
PIN CONNECTION
(top view)
MULTIWATT15 Horizo ntal
(Plastic Package)
ORDERING NUMBER : L4964HT
Pins 1, 4, 15 must not be connected. Leave open circuit.
April 1993
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