原标题：ADI ADP5034微电源管理(PMU)解决方案

　　ADI公司的ADP5034集成了两个高性能降压稳压器(1200mA)和两个低压降(LDO)的稳压器(300mA),输入电压2.3V-5.5V,稳压器精度±3%,可编程输出电压,工作频率3MHz,采用24引脚4 mm × 4 mm LFCSP封装,主要用在处理器,ASIC,FPGA和RF芯片组电源,手提仪器和医疗设备以及空间受限设备.本文介绍了ADP5034主要特性,方框图,典型应用电路和所采用元件,以及微电源管理单元(PMU)评估板主要特性,电路图,材料清单和元器件布局图.

　　The ADP5034 combines two high performance buck regulators and two low dropout (LDO) regulators in a small, 24-lead 4 mm × 4 mm LFCSP to meet demanding performance and board space requirements.

　　The high switching frequency of the buck regulators enables tiny multilayer external components and minimizes the board space. When the MODE pin is set to high, the buck regulators operate in forced PWM mode. When the MODE pin is set to low, the buck regulators operate in PWM mode when the load is above a pre-defined threshold. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving the light load efficiency.

　　The two bucks operate out of phase to reduce the input capacitor requirement. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5034 LDOs extend the battery life of portable devices. The ADP5034 LDOs maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.

　　Regulators in the ADP5034 are activated through dedicated enable pins. The default output voltages can be externally set in the adjustable version, or factory programmable to a wide range of preset values in the fixed voltage version.

　　ADP5034主要特性:

　　Main input voltage range: 2.3 V to 5.5 V

　　Two 1200 mA buck regulators and two 300 mA LDOs

　　24-lead, 4 mm × 4 mm LFCSP package

　　Regulator accuracy: ±3%

　　Factory programmable or external adjustable VOUTx

　　3 MHz buck operation with forced PWM and auto PWM/PSM modes

　　BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V

　　LDO1/LDO2: output voltage range from 0.8 V to 5.2 V

　　LDO1/LDO2: low input supply voltage from 1.7 V to 5.5 V

　　LDO1/LDO2: high PSRR and low output noise

　　ADP5034应用:

　　Power for processors, ASICS, FPGAs, and RF chipsets

　　Portable instrumentation and medical devices

　　Space constrained devices

　　图1. ADP5034方框图

　　图2. ADP5034典型应用电路图

　　图3. ADP503采用PSM/PWM控制的处理器系统电源管理图

　　图4. ADP5034带使能引脚的固定输出电压电路图

　　图5. ADP5034带使能引脚的可调输出电压电路图

　　材料清单:

　　ADP5034微电源管理单元(PMU)评估板

　　The ADP5034 evaluation board has two step-down regulators with two LDOs that enable evaluation of the ADP5034. The evaluation board is available in standard voltage options.

　　The ADP5034 uses a proprietary high speed, current mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP5034 features a power save mode (PSM) that reduces the switching frequency under light load conditions, as well as the option to change the mode to fixed PWM operation. The 3 MHz switching frequency minimizes the size of the external components.

　　The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5034 LDO regulators extend the battery life of portable devices.

　　图6.ADP5034微电源管理单元(PMU)评估板外形图

　　ADP5034微电源管理单元(PMU)评估板主要特性:

　　Full-featured evaluation board for the ADP5034 Standalone capability Simple device measurements, including line and load regulation, demonstrable with A single voltage supply A voltmeter A current meter Load resistors Easy access to external components Cascading options to supply the low dropout (LDO) from either buck Dedicated enable option for each channel Mode option to change bucks from PFM to PWM operation

　　ADP5034评估板材料清单: