基于MIC2826設(shè)計的四輸出可編電源管理方案

MIC2826是四輸出可編程電源管理集成電路(PMIC),最適合用作移動應(yīng)用處理器,協(xié)處理器,DSP,GPS和媒體播放器芯片組的高效電源. MIC2826集成了一個4MHz 500mA PWM/PFM同步降壓穩(wěn)壓器和三個LDO穩(wěn)壓器(每個輸出150mA)以及提供用于編程的400kHz I2C接口.本文介紹了MIC2826主要特性,方框圖,以及在GPS子系統(tǒng)的應(yīng)用電路, MIC2826 評估板電路圖和材料清單(BOM).

The Micrel MIC2826 is a four output, programmable Power Management IC, optimized for high efficiency power support in Mobile Application Processors, Co-Processors, DSPs, GPS and Media Player chipsets. The device integrates a single 500mA PWM/PFM synchronous buck (step-down) regulator with three Low Dropout Regulators and a 400kHz I²C interface that provides programmable Dynamic Voltage Scaling (DVS), Power Sequencing, and individual output Enable/Disable controls allowing the user to optimally control all four outputs.

The 4MHz synchronous buck regulator features a patented HyperLight Load™ (HLL) architecture which minimizes switching losses and provides low quiescent current operation for high efficiency at light loads. Additional benefits of this proprietary architecture are low output ripple voltage and fast transient response throughout the entire load range with the use of small output capacitors, reducing the overall system size.

Three high performance LDOs are integrated into the MIC2826 to provide additional system voltages for I/O, memory and other analog functions. Each LDO is capable of sourcing 150mA output current with high PSRR and low output noise. A 2% output voltage accuracy, low dropout voltage (150mV @ 150mA), and low ground current of 116μA (all three LDOs operating) makes this device ideally suited for mobile applications.

The MIC2826 is available in a tiny 14-pin 2.5mm x 2.5mm Thin MLF® with a junction operating range from -40℃ to +125℃.

MIC2826主要特性:

• Fast-mode I2C control interface

• Tiny 14-pin 2.5mm x 2.5mm MLF® package

• Default start-up voltage states and sequencing

• Fault indication processor flag – IRQb

• -40℃ to 125℃ junction temperature range

• Thermal shutdown and current-limit protection

• Power On After Fault (POAF) function

DC-DC Synchronous Buck

• 2.7V to 5.5V input voltage range

• 500mA continuous output current

• HyperLight Load™ mode

– 25μA quiescent current

• 90% peak efficiency; 85% at 1mA

• Ultra-fast transient response

• Dynamic Voltage Scaling (DVS) range: 0.8V to 1.8V

– 0.8V to 1.2V in 25mV steps

– 1.2V to 1.8V in 50mV steps

• ±2% initial accuracy

• Low output voltage ripple: 20mVpp in HyperLight

Load™ mode, 3mV in full PWM mode

LDOs

• 1.8V to VDVIN input voltage range

• 150mA output current (each LDO)

• Dynamic Voltage Scaling (each LDO)

– DVS range: 0.8V to 3.3V in 50mV steps

• ±2% initial accuracy

• Low quiescent current – 50μA (each LDO)

• Low dropout voltage – 50mV @ 50mA

• Low output noise - 45μVRMS

• Stable with ceramic output capacitors

• 65dB PSRR at 1kHz

MIC2826應(yīng)用:

• Application processors

• GPS subsystems

• General purpose PMIC

• Mobile phones / PDAs

• Portable media players

• Mobile television receivers
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圖1.MIC2826功能方框圖

圖2.MIC2826在GPS子系統(tǒng)的應(yīng)用電路

MIC2826 評估板

The MIC2826 evaluation kit includes:

• MIC2826 Evaluation Board

• CD-ROM including:

– MIC2826/7 Evaluation Software

– Evaluation User Guide

Third party hardware required:

• USB-to-I2C Interface Board (dongle)

• USB Peripheral Cable

圖3.MIC2826 評估板外形圖


圖4.MIC2826 評估板電路圖

MIC2826 評估板材料清單(BOM):