ADI ADP2384/ADP2386降压DC－DC控制器参考方案

发布时间：2013-1-13 11:41 发布者：1770309616

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.

The ADP2384 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 4 A of continuous current. Each IC draws less than 120 μA current from the input source when it is disabled.

The ADP2386 is a synchronous step-down, dc-to-dc regulator with an integrated 44 mΩ, high-side power MOSFET and an 11 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 ADP2386 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.

The ADP2386 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 6 A of continuous current. Each IC draws less than 110 μA current from the input source when it is disabled.

This regulator targets high performance applications that require high efficiency and design flexibility. External compensation and an adjustable soft start function provide design flexibility. The power-good output and precision enable input provide simple and reliable power sequencing.

Other key features include undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP), and thermal shutdown (TSD).

ADP2384主要特性：

Input voltage: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ/11.6 mΩ
Reference voltage: 0.6 V ± 1%
Continuous output current: 4 A
Programmable switching frequency: 200 kHz to 1.4 MHz
Synchronizes to external clock: 200 kHz to 1.4 MHz
180° out-of-phase clock synchronization
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool

ADP2386主要特性：

Input voltage: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ/11 mΩ
Reference voltage: 0.6 V ± 1%
Continuous output current: 6 A
Programmable switching frequency: 200 kHz to 1.4 MHz
Synchronizes to external clock: 200 kHz to 1.4 MHz
180°out of phase clock synchronization
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool

ADP2384/ ADP2386应用：

Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point-of-load applications

图1. ADP2384方框图

图2. ADP2386方框图

ADP2384/ADP2386 设计方案主要特性：

Input voltage: 4.5 V to 20 V
±1% output voltage accuracy
Integrated MOSFET
44 mΩ/11 mΩ
Continuous output current
4 A for ADP2384
6 A for ADP2386
Programmable switching frequency: 200 kHz to 1.4 MHz
Synchronizes to external clock: 200 kHz to 1.4 MHz
180° out-of-phase synchronization
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into precharged output

ADP2384电路图：