1A, 2.2MHz Step-Down Switching Regulator in 2mm x 3mm DFN

The LT3503 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.

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 mode provides output disconnect, enabling easy power management in battery-powered systems.

Applications

* Automotive Battery Regulation

* Industrial Control Supplies

* Wall Transformer Regulation

* Distributed Supply Regulation

* Battery-Powered Equipment

* 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