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

2022-07-14

Analog Devices’ ADP2384/ADP2386 are two high-efficiency, synchronous step-down DC/DC regulators in a 4 mm × 4 mm LFCSP package that integrate a 44 mΩ high-side sense power MOSFET and a 11.6 mΩ (ADP2384), 11 mΩ (ADP2386) synchronous rectification MOSFET device. To achieve outstanding stability and transient response characteristics, the device uses a peak current mode, fixed frequency pulse width modulation control scheme. The switching frequency of the ADP2384/ADP2386 devices can be programmed from 200kHz to 1.4MHz. To reduce system noise, a synchronization function allows the switching frequency to be synchronized by an external clock. At the same time, it also has the functions of under-voltage shutdown, over-voltage protection, over-current protection, short-circuit protection, and thermal shutdown. This article introduces the device, characteristics, application direction and internal structure block diagram respectively through the characteristics of ADP2384 and ADP2386. 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 through design examples.

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 main features:

Input voltage: 4.5V to 20V
Integrated MOSFETs: 44 mΩ/11.6 mΩ
Reference voltage: 0.6 V ± 1%
Continuous output current: 4A
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 main features:

Input voltage: 4.5V to 20V
Integrated MOSFETs: 44 mΩ/11 mΩ
Reference voltage: 0.6 V ± 1%
Continuous output current: 6A
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 Applications:

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

ADIADP2384/ADP2386 Step-Down DC-DC Controller Reference Solution
Figure 1. ADP2384 Block Diagram

Figure 2. ADP2386 Block Diagram

The main features of the ADP2384/ADP2386 design scheme:

Input voltage: 4.5V to 20V
±1% output voltage accuracy
Integrated MOSFETs
44mΩ/11mΩ
Continuous output current
4 A for ADP2384
6A 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 circuit diagram:
ADIADP2384/ADP2386 Step-Down DC-DC Controller Reference Solution
Figure 3. ADP2384 Circuit Diagram