Features

• 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

Typical Application

Description

The LT®3502/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.