1

LT1933

1933f

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

600mA, 500kHz Step-Down

Switching Regulator

in SOT-23

, LTC and LT are registered trademarks of Linear Technology Corporation.

The LT

converter with an internal 0.75A power switch, packaged

in a tiny 6-lead SOT-23. The wide input range of 3.6V to

36V makes the LT1933 suitable for regulating power from

a wide variety of sources, including unregulated wall

transformers, 24V industrial supplies and automotive

batteries. Its high operating frequency allows the use of

tiny, low cost inductors and ceramic capacitors, resulting

in low, predictable output ripple.

Cycle-by-cycle current limit provides protection against

shorted outputs, and soft-start eliminates input current

surge during start up. The low current (<2µA) shutdown

provides output disconnect, enabling easy power man-

agement in battery-powered systems.

■

3.3V at 600mA from 12V to 36V Input

■

Fixed Frequency 500kHz Operation

■

Internally Compensated

■

Low Profile (1mm) SOT-23 (ThinSOT™) Package

3.3V Step-Down Converter

4.5V TO 36V

OFF ON

0.1µF

22µH

1N4148

MBRM140

10k

16.5k

22µF

1933 TA01a

2.2µF

3.3V/500mA

BOOST

GND

FB

SHDN

SW

LT1933

Efficiency

LOAD CURRENT (mA)

0

90

95

300

400

1933 TA01b

85

80

100

200

600

500

75

70

65

ThinSOT is a trademark of Linear Technology Corporation.