原标题：ADI ADP2443同步降压3A DC-DC转换电源解决方案

　　ADI公司的ADP2443是集成了98 mΩ高端功率金属氧化物半导体场效应晶体管(MOSFET)和35 mΩ同步整流器MOSFET的同步降压DC/DC稳压器,输入电压4.5V-36V,输出电压可调至0.6V,输出电流3A,开关频率可在200 kHz至1.8 MHz范围内编程,保护特性包括欠压闭锁(UVLO),过压保护(OVP),过流保护(OCP),短路保护(SCP)和热关断(TSD),主要用在中间供电轨转换,多单元电池供电系统,过程控制和工业自动化,医疗保健以及网络和服务器.本文介绍了ADP2443主要特性,功能框图,几种应用电路以及评估板ADP2443-EVALZ主要特性,电路图,材料清单和PCB设计图.

　　The ADP2443 is synchronous step-down, dc-to-dc regulatorwith an integrated 98 mΩ, high-side power metal oxide semiconductorfield effect transistor (MOSFET) and a 35 mΩ, synchronousrectifier MOSFET to provide a high efficiency solution in acompact 4 mm × 4 mm LFCSP package. The regulators operatefrom an input voltage range of 4.5 V to 36 V. The output voltagecan be adjusted down to 0.6 V and deliver up to 3 A ofcontinuous current. The fast 50 ns minimum on time allows theregulators convert high input voltage to low output voltage at highfrequency.

　　The ADP2443 uses an emulated current mode, constant frequencypulse-width modulation (PWM) control scheme for excellentstability and transient response. The switching frequency of theADP2443 can be programmed from 200 kHz to 1.8 MHz. The synchronization function allows the switching frequency be synchronizedwith an external clock to minimize the system noise.The ADP2443 targets high performance applications that requirehigh efficiency and design flexibility. External compensationand an adjustable soft start function provide design flexibility.The power-good output and precision enable input providesimple 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).The ADP2443 operates over the −40℃ to +125℃ operatingjunction temperature range and is available in a 24-lead, 4 mm ×4 mm LFCSP package.

　　ADP2443主要特性:

　　Continuous output current: 3 A

　　Input voltage: 4.5 V to 36 V

　　Integrated MOSFETs: 98 mΩ/35 mΩ

　　Reference voltage: 0.6 V ± 1%

　　Fast minimum on time: 50 ns

　　Programmable switching frequency: 200 kHz to 1.8 MHz

　　Synchronizes to external clock: 200 kHz to 1.8 MHz

　　Precision enable and power good

　　Cycle-by-cycle current limit with hiccup protection

　　External compensation

　　Programmable soft start time

　　Startup into a precharged output

　　Supported by ADIsimPowerdesign tool

　　ADP2443应用:

　　Intermediate power rail conversion

　　Multicell battery powered systems

　　Process control and industrial automation

　　Healthcare and medical

　　Networking and servers

　　图1.ADP2443功能框图

　　图2.ADP2443典型应用电路:VIN = 24 V, VOUT = 3.3 V, IOUT = 3A, fSW = 600 kHz

　　图3.ADP2443典型应用电路:VIN = 24 V, VOUT = 1.2 V, IOUT = 3 A, fSW = 500 kHz

　　图4.ADP2443典型应用电路:VIN = 24 V, VOUT = 5 V, IOUT = 3 A, fSW = 1.2 MHz

　　评估板ADP2443-EVALZ

　　The ADP2443-EVALZ evaluation board provides a complete and compact solution that allows users to evaluate all the performance of the ADP2443 with a near ideal PCB layout. The main device on the evaluation board, the ADP2443, is a synchronous step-down, dc-to-dc regulator with both high-side and low-side MOSFETs integrated to provide a high efficiency solution in a compact, 4 mm × 4 mm LFCSP package. The evaluation board has independent enable control, which allows flexible configuration when evaluating the ADP2443. Full details on the ADP2443 regulator are provided in the ADP2443 data sheet, available from Analog Devices, Inc. Consult the data sheet in conjunction with this user guide when working with this evaluation board.

　　评估板ADP2443-EVALZ主要特性:

　　Full featured evaluation board for the ADP2443 Compact solution size

　　4-layer high glass transition temperature (TG) printed circuit board (PCB) for superior thermal performance Convenient connections through vertical printed circuit tail pin headers

　　Supply voltage 4.5 V to 36 V for PVIN

　　Synchronization capable

　　Independent enable control

　　Power-good output

　　评估板ADP2443-EVALZ应用:

　　Full evaluation of the ADP2443

　　图5.评估板ADP2443-EVALZ外形图

　　图6.评估板ADP2443-EVALZ电路图

　　评估板ADP2443-EVALZ材料清单:

　　详情请见:

ADP2443-EVALZ-UG-1029.pdf

ADP2443.pdf