DESCRIPTION
The LT®3503 is a current mode PWM step-down DC/DC converter with an internal 1.45A power switch. The wide operating input range of 3.6V to 20V makes the LT3503 ideal for regulating power from a wide variety of sources. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

FEATURES
■ Wide Input Range: 3.6V to 20V
■ 5V at 1.2A from 11V to 18V Input
■ 5V at 1A from 7.2V to 18V Input
■ 3.3V at 1.2A from 8.5V to 12V Input
■ 3.3V at 1A from 5.5V to 12V Input
■ Fixed Frequency Operation: 2.2MHz
■ Output Adjustable Down to 780mV
■ Short-Circuit Robust
■ Uses Tiny Capacitors and Inductors
■ Soft-Start
■ Internally Compensated
■ Low Shutdown Current: <2µA
■ Low VCESAT Switch: 400mV at 1A
■ Thermally Enhanced, 2mm × 3mm 6-Pin DFN Low Profile Package

APPLICATIONS
■ Automotive Battery Regulation
■ Industrial Control Supplies
■ Wall Transformer Regulation
■ Distributed Supply Regulation
■ Battery-Powered Equipment