Chapter 102

A new, high efficiency monolithic buck converter

San-Hwa Chee

Abstract

The LTC1265, a 14-pin SOIC step-down converter capable of operating at frequencies up to 700kHz, is described.

Keywords

Buck converter

LTC1265

The LTC1265 is a 14-pin SOIC step-down converter capable of operating at frequencies up to 700kHz. High frequency operation permits the use of small inductors for size sensitive applications. The LTC1265 has an internal 0.3Ω (at a supply voltage of 10V) P-channel power MOSFET switch, which is capable of supplying up to 1.2A of output current. With no load, the converter requires only 160μA of quiescent current; this decreases to a mere 5μA in shutdown conditions. In dropout mode, the internal P-channel power MOSFET ...

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