ADI ADP1882-3同步降压电源控制方案

ADI 公司的ADP1882/ADP1883是电流模式同步降压电源控制器，具有优异的瞬态响应，最佳的稳定性以及限流保护，可驱多个N沟功率级，降低输出电压低至0.8V。电源输入电压2.75V-20V，偏压电源为2.75V-5.5V，0.8V基准电压有±1.0%精度，工作频率可选择为300kHz，600kHz和1.0MHz，主要用在通信和网络设备，中高端服务器，STB和DSP核电源。本文介绍了ADP1882/ADP1883主要特性，方框图，典型应用电图，大电流评估板电路图和PCB布局图以及15A，20A输出等多种应用电路。

The ADP1882/ADP1883 are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current-limit, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by using valley current-mode control architecture. This allows the ADP1882/ADP1883 to drive all N-channel power stages to regulate output voltages as low as 0.8 V.

The ADP1883 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1883) section for more information).
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