1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10

The LT3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications.

Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost diode reduces component count.

Applications

* Automotive Systems

* Battery-Powered Equipment

* Wall Transformer Regulation

* Distributed Supply Regulation

* 3V to 40V Input Voltage Range

* 500mA Output Current

* Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502)

* 800mV Feedback Voltage

* Short-Circuit Robust

* Soft-Start

* Low Shutdown Current: <2μA

* Internally Compensated

* Internal Boost Diode

* Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-Lead MS10 Package* AEC-Q100 Compliant with Exception

* HBM ESD Classification Level 1C