May 2007

Rev. 3

1/14

14

ST750A

Adjustable step-down, current-mode PWM DC-DC converters

Features

no component design required

lockout protection

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

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.

SO-8

www.st.com

Order code

Part number

Packaging

ST750AC

ST750ACDTR