基于MIC2826设计的四输出可编电源管理方案

MIC2826是四输出可编程电源管理集成电路(PMIC),最适合用作移动应用处理器,协处理器,DSP,GPS和媒体播放器芯片组的高效电源. MIC2826集成了一个4MHz 500mA PWM/PFM同步降压稳压器和三个LDO稳压器(每个输出150mA)以及提供用于编程的400kHz I2C接口.本文介绍了MIC2826主要特性,方框图,以及在GPS子系统的应用电路, MIC2826 评估板电路图和材料清单(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 C 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

C 25μA quiescent current

90% peak efficiency; 85% at 1mA

Ultra-fast transient response

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

C 0.8V to 1.2V in 25mV steps

C 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)

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

±2% initial accuracy

Low quiescent current C 50μA (each LDO)

Low dropout voltage C 50mV @ 50mA

Low output noise - 45μVRMS

Stable with ceramic output capacitors

65dB PSRR at 1kHz

MIC2826应用:

Application processors

GPS subsystems

General purpose PMIC

Mobile phones / PDAs

Portable media players

Mobile television receivers

图1.MIC2826功能方框图

图2.MIC2826在GPS子系统的应用电路

MIC2826 评估板

The MIC2826 evaluation kit includes:

MIC2826 Evaluation Board

CD-ROM including:

C MIC2826/7 Evaluation Software

C Evaluation User Guide

Third party hardware required:

USB-to-I2C Interface Board (dongle)

USB Peripheral Cable

图3.MIC2826 评估板外形图


图4.MIC2826 评估板电路图

MIC2826 评估板材料清单(BOM):