LT3570

www.DataSheet4U.com FEATURES n n n n n n n n LT3570 1.5A Buck Converter, 1.5A Boost Converter and LDO Controller DESCRIPTION The LT®3570 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 2MHz 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. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 2.5V to 36V Input Voltage Range Programmable Switching Frequency from 500kHz to 2MHz Synchronizable Up to 2.75MHz VOUT(MIN): 0.8V Independent Soft-Start for Each Converter Separate VIN Supplies for Each Converter Duty Cycle Range: 0% to 90% at 1MHz Available in 24-Lead (4mm × 4mm) QFN and 20-Lead TSSOP Packages APPLICATIONS n n n n n Cable and Satellite Set-Top Boxes Automotive Systems Telecom Systems “Dying Gasp” Systems TFT LCD Displays TYPICAL APPLICATION VIN 5V 10μF SHDN1 SHDN2 SHDN3 D1 6.8μH SW1 143k 10μF 10.0k 22k NPN_DRV 1nF 10nF FB3 GND 22.1k RT SYNC 1...