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ST750A

ADJUSTABLE STEP-DOWN,

CURRENT-MODE PWM DC-DC CONVERTERS

s

s

s

s

s

s

s

s

s

s

UP TO 450mA LOAD CURRENTS

200kHz HIGH-FREQUENCY

CURRENT-MODE PWM

85% TO 96% EFFICIENCIES

33碌H OR 100碌H PRE-SELECTED

INDUCTOR VALUE, NO COMPONENT

DESIGN REQUIRED

0.8mA QUIESCENT CURRENT

0.3碌A SHUTDOWN SUPPLY CURRENT

ADJUSTABLE OUTPUT VOLTAGE

OVERCURRENT, SOFT-START AND

UNDERVOLTAGE LOCKOUT PROTECTION

CYCLE-BY-CYCLE CURRENT LIMITING

PACKAGE AVAILABLE : DIP- 8 AND SO - 8

DIP-8

SO-8

DESCRIPTION

The ST750A is an adjustable output CMOS,

step-down switching regulator. The ST750A

accepts inputs between 4V and 11V and delivers

450mA. Typical efficiencies are 85% to 96%.

Quiescent supply current is 0.8mA and only 0.3碌A

in shutdown mode. The output does not exhibit

frequency over this specified range. Pulse-width

modulation (PWM) current-mode control provides

SCHEMATIC DIAGRAM

precise output regulation and excellent transient

responses.

Output

voltage

accuracy

is

guaranteed to be 鹵4.5% plus feedback resistor

tolerance over line, load, and temperature

varations.

Fixed-frequency switching and absence of

subharmonic ruipple allows easy filtering of output

ripple and noise, as well as the use of small

external components. This regulators require only

a single inductor value to work in most

applications, so no inductor design is necessary.

Typical applications are: Cellular phones & radios,

portable Instruments, Portable Communications

Equipments and Computer Peripherals.

January 2003

1/9

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