LT1936

1

1936fd

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

1.4A, 500kHz Step-Down

Switching Regulator

converter with an internal 1.9A power switch, packaged

in a tiny, thermally enhanced 8-lead MSOP. The wide in-

put range of 3.6V to 36V makes the LT1936 suitable for

regulating power from a wide variety of sources, including

automotive batteries, 24V industrial supplies and unregu-

lated wall adapters. Its high operating frequency allows the

use of small, low cost inductors and ceramic capacitors,

resulting in low, predictable output ripple.

Cycle-by-cycle current limit, frequency foldback and

thermal shutdown provide protection against shorted

outputs, and soft-start eliminates input current surge

during start-up. Transient response can be optimized by

using external compensation components, or board space

can be minimized by using internal compensation. The

low current (<2μA) shutdown mode enables easy power

management in battery-powered systems.

■

Wide Input Range: 3.6V to 36V

■

Short-Circuit Protected Over Full Input Range

■

1.9A Guaranteed Minimum Switch Current

■

5V at 1.4A from 10V to 36V Input

■

3.3V at 1.4A from 7V to 36V Input

■

5V at 1.2A from 6.3V to 36V Input

■

3.3V at 1.2A from 4.5V to 36V Input

■

Output Adjustable Down to 1.20V

■

500kHz Fixed Frequency Operation

■

Soft-Start

■

Uses Small Ceramic Capacitors

■

Internal or External Compensation

■

Low Shutdown Current: <2μA

■

Thermally Enhanced 8-Lead MSOP Package

■

Automotive Battery Regulation

■

Industrial Control Supplies

■

Unregulated Wall Adapters

3.3V Step-Down Converter

Efficiency

4.5V TO 36V

ON OFF

0.22μF

10μH

17.4k

22μF

1936 TA01a

4.7μF

3.3V

1.2A

GND

COMP

FB

LT1936

SHDN

SW

10k

LOAD CURRENT (A)

0

65

70

75

80

85

95

0.5

1

1936 TA01b

1.5

90

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trademarks are the property of their respective owners.