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ADI公司的ADP5034集成了兩個(gè)高性能降壓穩(wěn)壓器(1200mA)和兩個(gè)低壓降(LDO)的穩(wěn)壓器(300mA),輸入電壓2.3V-5.5V,穩(wěn)壓器精度±3%,可編程輸出電壓,工作頻率3MHz,采用24引腳4 mm × 4 mm LFCSP封裝,主要用在處理器,ASIC,FPGA和RF芯片組電源,手提儀器和醫(yī)療設(shè)備以及空間受限設(shè)備.本文介紹了ADP5034主要特性,方框圖,典型應(yīng)用電路和所采用元件,以及微電源管理單元(PMU)評(píng)估板主要特性,電路圖,材料清單和元器件布局圖. 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應(yīng)用: Power for processors, ASICS, FPGAs, and RF chipsets Portable instrumentation and medical devices Space constrained devices 
圖1. ADP5034方框圖
圖2. ADP5034典型應(yīng)用電路圖
圖3. ADP503采用PSM/PWM控制的處理器系統(tǒng)電源管理圖
圖4. ADP5034帶使能引腳的固定輸出電壓電路圖
圖5. ADP5034帶使能引腳的可調(diào)輸出電壓電路圖 材料清單:
ADP5034微電源管理單元(PMU)評(píng)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.
圖6.ADP5034微電源管理單元(PMU)評(píng)估板外形圖 ADP5034微電源管理單元(PMU)評(píng)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
圖7.ADP5034微電源管理單元(PMU)評(píng)估板電路圖
圖8.ADP5034微電源管理單元(PMU)評(píng)估板元件布局圖(頂層)
圖9.ADP5034微電源管理單元(PMU)評(píng)估板元件布局圖(底層) ADP5034評(píng)估板材料清單:
詳情請(qǐng)見: 
ADP5034[1].pdf
(700.25 KB)
UG-271[2].pdf
(442.21 KB)
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