1/10November 2000
■ OUTPUT VOLTAGE 3.3V
■ SUPPLY VOLTAGE RANGE FROM 3.3V TO
11V
■ GUARANTEED OUTPUT CURRENT: 500mA
■ TYPICAL OPERATION FREQUENCY:
200KHz
■ VERY LOW QUIESCENT CURRENT: 0.6mA
ON MODE 0.2µA OFF MODE
■ SWITCH ON/OFF CONTROL
■ TYPICAL EFFICENCY: 90%
■ OPERATING TEMPERATURE RANGE:
-40°C TO 85°C
■ 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 0.2µA 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 22µH 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
