Linear LTC3614 4A 4MHz同步降压电源解决方案

Linear 公司的LTC3614是 4A 4MHz同步降压DC/DC转换器,采用电流模式和固定频率架构.无负载睡眠模式的电流为75uA,输入电压从2.25V到5.5V,100%占空比,工作频率可编程到4MHz,允许使用小型SMT电感器.输出电压精度±1%,电压可低至0.6V,效率高达95%,主要用在POL电源,分布电源,手提计算机电源,DDR存储器电源和手持设备.本文介绍了LTC3614主要特性,方框图以及多种应用电路.

4A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter

The LTC3614 is a low quiescent current monolithic synchronous buck regulator using a current mode, constant frequency architecture. The no-load DC supply current in sleep mode is only 75μA while maintaining the output voltage (Burst Mode operation) at no load, dropping to zero current in shutdown. The 2.25V to 5.5V input supply voltage range makes the LTC3614 ideally suited for single Li-Ion as well as fixed low voltage input applications. 100% duty cycle capability provides low dropout operation, extending the operating time in battery-powered systems.

The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. For switching-noise-sensitive applications, the LTC3614 can be synchronized to an external clock at up to 4MHz.
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