ADI ADP2384/ADP2386降壓DC－DC控制器參考方案

ADI公司的ADP2384/ADP2386是兩款4 mm × 4 mm LFCSP封裝的高效、同步降壓DC/DC穩(wěn)壓器，內(nèi)部集成一個(gè)44 mΩ的高邊檢測(cè)功率MOSFET及一個(gè)11.6 mΩ（ADP2384）、11 mΩ(ADP2386)的同步整流MOSFET器件。為了實(shí)現(xiàn)杰出的穩(wěn)定性和瞬態(tài)響應(yīng)特性，該器件采用峰值電流模式，固定頻率脈寬調(diào)制控制方案。ADP2384/ADP2386器件的開(kāi)關(guān)頻率可編程設(shè)置范圍為200kHz到1.4MHz，為了減少系統(tǒng)噪聲，同步功能允許開(kāi)關(guān)頻率由外部時(shí)鐘同步。同時(shí)還具有欠壓關(guān)斷、過(guò)壓保護(hù)、過(guò)流保護(hù)、短路保護(hù)、過(guò)熱關(guān)機(jī)的功能。本文通過(guò)對(duì)ADP2384和ADP2386兩款器件的特點(diǎn)，分別進(jìn)行介紹器件、特性、應(yīng)用方向及內(nèi)部結(jié)構(gòu)框圖。通過(guò)設(shè)計(jì)實(shí)例分別給出在固定頻率600kHz條件下，輸入12V，輸出3.3V6A和輸出3.3V4A的原理圖及PCB板圖。

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應(yīng)用：

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

圖1. ADP2384方框圖

圖2. ADP2386方框圖

ADP2384/ADP2386 設(shè)計(jì)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電路圖：

圖3. ADP2384電路圖

ADP2386電路圖：

圖4. ADP2386電路圖

ADP2384材料清單：