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November 2000

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OUTPUT VOLTAGE 3.3V

s

SUPPLY VOLTAGE RANGE FROM 3.3V TO

11V

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GUARANTEED OUTPUT CURRENT: 500mA

s

TYPICAL OPERATION FREQUENCY:

200KHz

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VERY LOW QUIESCENT CURRENT: 0.6mA

ON MODE 0.2

µA OFF MODE

s

SWITCH ON/OFF CONTROL

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TYPICAL EFFICENCY: 90%

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OPERATING TEMPERATURE RANGE:

-40°C TO 85°C

s

AVAILABLE IN SO-8 AND DIP-8 PACKAGES

DESCRIPTION

The ST763A is a step-down switching regulator . It

operates from 3.3V to 11V giving a fixed 3.3V

output voltage, delivering up to 500mA. The

mainly features are typical efficiency of 90%,

quiescent current of 0.6mA, and only 0.2

µA in

shut-down.

The PWM current mode control provides precise

output

regulation

and

very

good

transient

response. Output voltage accuracy is guaranteed

to be

±5% over line, load and temperature

variations.

A

minimum

number

of

external

components is used and the fixed frequency

switching allows easy filtering of output ripple and

noise.

Other features of this ddevice are cycle-by-clicle

current limiting, overcurrent limiting, under voltage

lockout and programmable soft-start protection.

A 22

µH inductor works in most applications, so no

sophisticated design is necessary.

Package available are SO-8 and DIP-8.

Typical application are in 5V to 3.3V converters,

cellular phones, portable instruments, hand-held

computers, and peripherals.

ST763A

SERIES

3.3V STEP DOWN

CURRENT MODE PWM DC-DC CONVERTERS

SCHEMATIC DIAGRAM

DIP-8

SO-8