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ST750A Datasheet(PDF) 1 Page - STMicroelectronics

Part No. ST750A
Description  ADJUSTABLE STEP-DOWN, CURRENT-MODE PWM DC-DC CONVERTERS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST750A Datasheet(HTML) 1 Page - STMicroelectronics

   
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January 2003
s
UP TO 450mA LOAD CURRENTS
s
200kHz HIGH-FREQUENCY
CURRENT-MODE PWM
s
85% TO 96% EFFICIENCIES
s
33
µHOR100µH PRE-SELECTED
INDUCTOR VALUE, NO COMPONENT
DESIGN REQUIRED
s
0.8mA QUIESCENT CURRENT
s
0.3µA SHUTDOWN SUPPLY CURRENT
s
ADJUSTABLE OUTPUT VOLTAGE
s
OVERCURRENT, SOFT-START AND
UNDERVOLTAGE LOCKOUT PROTECTION
s
CYCLE-BY-CYCLE CURRENT LIMITING
s
PACKAGE AVAILABLE : DIP- 8 AND 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
µA
in shutdown mode. The output does not exhibit
frequency over this specified range. Pulse-width
modulation (PWM) current-mode control provides
precise output regulation and excellent transient
responses.
Output
voltage
accuracy
is
guaranteed to be ±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.
ST750A
ADJUSTABLE STEP-DOWN,
CURRENT-MODE PWM DC-DC CONVERTERS
SCHEMATIC DIAGRAM
DIP-8
SO-8


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