基于MIC2829設(shè)計的3G-4G USB無線應(yīng)用電源技術(shù)

MIC2829是Micrel公司的高度集成的電源管理集成電路(PMIC),設(shè)計用于3G/4G (HEDGE/LTE 與WiMAX) USB無線應(yīng)用. MIC2829是完整的電源管理解決方案,能給處理器,雙路標準的RF(如HEDGE/LTE 或WiMAX)收發(fā)器,功率放大器,存儲器, USB-PHY相關(guān)的I/O接口和其它系統(tǒng)要求提供電源.輸入電壓為2.7V-5.5V,有六個DC降壓穩(wěn)壓器,兩個PWM降壓穩(wěn)壓器和11個LDO.主要應(yīng)用在4G LTE USB調(diào)制解調(diào)器,3G/4G (HEDGE/LTE)無線芯片組,WiMAX調(diào)制解調(diào)器,Express卡調(diào)制解調(diào)器,UMPC/筆記本電腦無線數(shù)據(jù)通信以及手提設(shè)備.本文介紹了MIC2829主要特性,方框圖, 典型應(yīng)用框圖及其材料清單, MIC2829 評估板電路圖和所用板材料清單(BOM).

3G/4G HEDGE/LTE PMIC with Six Buck Converters, Eleven LDOs and SIM Card Level Translation

The MIC2829 is a highly integrated Power Management Integrated Circuit (PMIC) designed for 3G/4G (HEDGE/LTE and WiMAX) USB wireless applications. It is a complete power management solution which provides power to processors, dual standard RF (such as HEDGE/LTE or WiMAX) transceivers and power amplifiers, memory, USB-PHY associated I/O interfaces and other system requirements.

The MIC2829 incorporates six DC/DC buck converters, eleven LDOs and digital level shifters for SIM Card support inside a single package. Four of the six integrated DC/DC buck converters incorporate HyperLight Load TM (HLL) technology. Each of these buck regulators operate at high switching speed in PWM mode (4MHz/2.5MHz) and maintain high efficiency in light load conditions. The high speed PWM operation allows the use of very small inductors and capacitors minimizing board area while the HLL mode enables 87% efficiency at 1mA. HyperLight Load TM technology also has unmatched load transient response to support advance portable processor requirements.

The remaining two DC/DC buck converters support 100% duty cycle operation and can deliver greater than 96% efficiency. This allows pre-regulation of system LDOs for high efficiency power system partitioning.

The MIC2829 has eleven low dropout regulators (LDOs). Five general purpose LDOs provide low dropout, excellent output accuracy of ±3% and only require 40 μA of ground current for each to operate. The remaining six are high performance Low Noise Regulators (LNRs) provide high PSRR and low output noise for sensitive RF subsystems. Each LNR requires only 20 μA of ground current to operate. The MIC2829 also has three high speed level shifters for digital SIM Card signal translation and a 50mA SIM power supply.

The MIC2829 is available in a 76-pin 5.5mm x 5.5mm LGA package with an operating junction temperature range from –40℃ to +125℃.

MIC2829主要特性:

Input voltage range: 2.7V to 5.5V

Six DC Step-Down Regulators

Four HyperLight LoadTM step-down regulators

- Low quiescent current – typical 40 μA

- DC1: 4MHz / 1000mA

- DC2: 4MHz / 300mA (with voltage scaling)

- DC3: 2.5MHz / 600mA

- DC4: 4MHz / 600mA (with adjustable delay POR)

Two PWM step-down regulators

- DC5 and DC6: Fixed 2MHz / 800mA

- 100% duty cycle

Eleven Low Dropout Regulators (LDOs)

Five general purpose 200mA LDOs (LDO1-4, LDO11)

- LDO3: 38mV dropout at 100mA

- LDO2 and LDO4: 80mV dropout at 100mA

- LDO1 and LDO11: 115mV dropout at 100mA

- Output accuracy ± 3%

- 40μA ground current

Six high performance 200mA LNRs (LDO5-10)

- High PSRR 70dB at 1kHz

- Low noise: 20 μV RMS

- 40mV dropout at 100mA

- Output accuracy ± 3%

- 20μA ground current

SIM card level translator

SIM card power supply (50mA)

Thermal shutdown and current limit protection

UVLO – under voltage lockout protection

76-pin 5.5mm x 5.5mm LGA package

–40℃ to +125℃ operating junction temperature range

MIC2829應(yīng)用:

? 4G LTE USB modems

? 3G/4G (HEDGE/LTE) wireless chipsets

? WiMAX modems

? Express card modems

? UMPC/notebook PC wireless data communications

? Portable applications