ADI ADP2384/ADP2386降压DC－DC控制器参考方案

ADI公司的ADP2384/ADP2386是两款4 mm × 4 mm LFCSP封装的高效、同步降压DC/DC稳压器，内部集成一个44 mΩ的高边检测功率MOSFET及一个11.6 mΩ（ADP2384）、11 mΩ(ADP2386)的同步整流MOSFET器件。为了实现杰出的稳定性和瞬态响应特性，该器件采用峰值电流模式，固定频率脉宽调制控制方案。ADP2384/ADP2386器件的开关频率可编程设置范围为200kHz到1.4MHz，为了减少系统噪声，同步功能允许开关频率由外部时钟同步。同时还具有欠压关断、过压保护、过流保护、短路保护、过热关机的功能。本文通过对ADP2384和ADP2386两款器件的特点，分别进行介绍器件、特性、应用方向及内部结构框图。通过设计实例分别给出在固定频率600kHz条件下，输入12V，输出3.3V6A和输出3.3V4A的原理图及PCB板图。

The ADP2384 is a synchronous, step-down dc-to-dc regulator with an integrated 44 mΩ, high-side power MOSFET and an 11.6 mΩ, synchronous rectifier MOSFET to provide a high efficiency solution in a compact 4 mm × 4 mm LFCSP package. This device uses a peak current mode, constant frequency pulse- width modulation (PWM) control scheme for excellent stability and transient response. The switching frequency of the ADP2384 can be programmed from 200 kHz to 1.4 MHz. To minimize system noise, the synchronization function allows the switching frequency to be synchronized to an external clock.
..

查看全文