[原创]ADP1851降压DC－DC控制器参考方案

ADI公司的ADP1851是一款宽输入范围、同步降压DC-DC控制器，具有电压跟踪和同步的能力。多功能的ADP1851可配置为输入前馈电压模式或电流模式。输入电压范围：2.75-20V，输出电压范围为0.6V-0.9Vin。本文档描述了ADP1851-EVALZ评估板的设计、运行和测试结果。本评估板输入电压范围为9-15V，输出电压调节设置为1.8V，输出最大电流可达25A。ADP1851评估板包括外部可调软启动、输出过压保护、外部可编程的限流、功率输出和一个可编程的好振荡器频率，范围从200KHz至1.5MHz。本文介绍了ADP1851主要特性、方框图、评估板ADP1851-EVALZ主要特性、电路图、材料清单和PCB元件布局图。

The ADP1851 is a wide range input, dc-to-dc, synchronous buck controller capable of running from commonly used 3.3 V to 12 V (up to 20 V) voltage inputs. The device nominally operates in current mode with valley current sensing providing the fastest step response for digital loads. It can also be config-ured as a voltage mode controller with low noise and crosstalk for sensitive loads.

The ADP1851 is ideal in system applications requiring multiple output voltages. The ADP1851 includes a synchronization feature to eliminate beat frequencies between switching devices. It also provides accurate tracking capability between supplies and includes precision enable and power-good functions for simple, robust sequencing.
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