ADIADP2384/ADP2386 Step-Down DC-DC Controller Reference Solution

ADP2384/ADP2386 from Analog Devices are two high-efficiency, synchronous step-down DC/DC regulators in 4 mm × 4 mm LFCSP packages. They integrate a 44 mΩ high-side detection power MOSFET and a 11.6 mΩ (ADP2384) and 11 mΩ (ADP2386) synchronous rectifier MOSFET devices. In order to achieve outstanding stability and transient response characteristics, the device adopts a peak current mode and fixed frequency pulse width modulation control scheme. The switching frequency of the ADP2384/ADP2386 device can be programmed from 200kHz to 1.4MHz. In order to reduce system noise, the synchronization function allows the switching frequency to be synchronized by an external clock. It also has undervoltage shutdown, overvoltage protection, overcurrent protection, short circuit protection, and overtemperature shutdown functions. This article introduces the features of the ADP2384 and ADP2386 devices, and introduces the devices, characteristics, application directions, and internal structure block diagrams. Through design examples, the schematic diagram and PCB board diagram of input 12V, output 3.3V6A and output 3.3V4A under the condition of fixed frequency 600kHz are given respectively.

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 disab led .

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 main features:

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：

图3. ADP2384电路图

ADP2386电路图：

图4. ADP2386电路图

ADP2384材料清单：

ADP2386材料清单：

PCB元件布局图：