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STMicroelectronics Electronic Components Datasheet

L4964HT Datasheet

HIGH CURRENT SWITCHING REGULATOR

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L4964HT pdf
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
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® 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 Horizontal
(Plastic Package)
ORDERING NUMBER : L4964HT
April 1993
Pins 1, 4, 15 must not be connected. Leave open circuit.
1/13


STMicroelectronics Electronic Components Datasheet

L4964HT Datasheet

HIGH CURRENT SWITCHING REGULATOR

No Preview Available !

L4964HT pdf
L4964
PIN FUNCTIONS
N° Name
1 N.C.
2 Output
3 Supply Voltage
4 N.C.
5 Soft Start
6 Inhibit Input
7 Sync Input
8 Ground
9 Frequency
Compensation
10 Feedback
Input
11 Oscillator
12 Reset Input
13 Reset Delay
14 Reset Output
15 N.C.
Function
Must not be connected. Leave open circuit.
Regulator Output.
Unregulated Voltage Input. An internal regulator powers the L4964’s internal logic.
Must not be connected. Leave open circuit.
Soft Start Time Constant. A capacitor is connected between this terminal and ground
to define the soft start time constant. This capacitor also determines the average short
circuit output current.
TTL - Level Remote Inhibit. A logic high level on this input disables the L4964.
Multiple L4964’s are synchronized by connecting the pin 7 inputs together and omitting
the oscillator RC network on all but one device.
Common Ground Terminal.
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
The Feedback Terminal of the Regulation Loop. The output is connected directly to
this terminal for 5.1 V operation ; it is connected via a divider for higher voltages.
A parallel RC network connected to this terminal determines the switching frequency.
The pin must be connected to pin 7 input when the internal oscillator is used.
Input of the Reset Circuit. The threshold is roughly 5 V. It may be connected to the
beedback point or via a divider to the input.
A capacitor connected between this terminal and ground determines the reset signal
delay time.
Open Collector Reset Signal Output. This output is high when the supply is safe.
Must not be connected. Leave open circuit.
BLOCK DIAGRAM
2/13


Part Number L4964HT
Description HIGH CURRENT SWITCHING REGULATOR
Maker STMicroelectronics
Total Page 13 Pages
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