Features

• 2.5V to 36V Input Voltage Range
• Programmable Switching Frequency
• from 500kHz to 2.1MHz
• Synchronizable Up to 2.75MHz
• V_OUT(MIN): 0.8V
• Independent Soft-Start for Each Converter
• Separate V_IN Supplies for Each Converter
• Duty Cycle Range: 0% to 90% at 1MHz
• Available in 24-Lead (4mm × 4mm) QFN and
• 20-Lead TSSOP Packages

Typical Application

Description

The LT3570 is a buck and boost converter with internal power switches and LDO controller. Each converter is designed with a 1.5A current limit and an input range from 2.5V to 36V, making the LT3570 ideal for a wide variety of applications. Switching frequencies up to 2.1MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock up to 2.75MHz.

The LT3570 features a programmable soft-start function that limits the feedback voltage during start-up helping prevent overshoot and limiting inrush current. The LDO controller is capable of delivering up to 10mA of base current to an external NPN transistor.