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 – 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应用:

• Application processors

• GPS subsystems

• General purpose PMIC

• Mobile phones / PDAs

• Portable media players

• Mobile television receivers

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