ST750A_07 Datasheet, PDF (1/14 Pages) STMicroelectronics – Adjustable step-down, current-mode PWM DC-DC converters

ST750A
Adjustable step-down, current-mode PWM DC-DC converters
Features
■ Up to 450mA load currents
■ 200kHz high-frequency current-mode PWM
■ 85% to 96% efficiencies
■ 33mH or 100mH pre-selected inductor value,
no component design required
■ 0.8mA quiescent current
■ 0.3µA shutdown supply current
■ Adjustable output voltage
■ Overcurrent, soft-start and undervoltage
lockout protection
■ Cycle-by-cycle current limiting
■ Package available: 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
0.3mA in shutdown mode. The output does not
exhibit frequency over this specified range. Pulse-
width modulation (PWM) current-mode control
SO-8
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
variations.
Fixed-frequency switching and absence of sub-
harmonic ripple 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 Equipment and Computer
Peripherals.
Order code
Part number
ST750AC
May 2007
Rev. 3
Packaging
ST750ACDTR
1/14
www.st.com
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