Linear LTC3615双路3A同步稳压方案
Linear公司的LTC3615是双路3A同步降压稳压器,采用电流模式固定频率架构.输入电压2.25V-5.5V,输出电流2x3A,效率高达94%,输出电压低至0.6V,输出电压精度±1%,可调整开关频率高达4MHz,主要用作点负载电源,分布式电源,手提计算机电源,DDR存储器电源和手持设备.本文介绍了LTC3615主要特性, 方框图以及多种典型应用电路.
The LTC®3615 is a dual 3A synchronous step-down regulator using a current mode, constant-frequency architecture. The DC supply current is only 130μA (Burst Mode operation at no-load) while maintaining the output voltages, dropping to zero current in shutdown. The 2.25V to 5.5V input supply range makes the LTC3615 ideally suited for single Li-Ion applications. 100% duty cycle capability provides low dropout operation, which extends operating time in battery-operated systems.
The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. 0°, 90°, or 180° of phase shift between the two channels can be selected to minimize input current ripple and output voltage ripple in a single 6A output configuration. Programmable slew rate limiting reduces EMI, and external synchronization can be applied up to 4MHz.
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