基于MIC2829设计的3G-4G USB无线应用电源技术

MIC2829是Micrel公司的高度集成的电源管理集成电路(PMIC),设计用于3G/4G (HEDGE/LTE 与WiMAX) USB无线应用. MIC2829是完整的电源管理解决方案,能给处理器,双路标准的RF(如HEDGE/LTE 或WiMAX)收发器,功率放大器,存储器, USB-PHY相关的I/O接口和其它系统要求提供电源.输入电压为2.7V-5.5V,有六个DC降压稳压器,两个PWM降压稳压器和11个LDO.主要应用在4G LTE USB调制解调器,3G/4G (HEDGE/LTE)无线芯片组,WiMAX调制解调器,Express卡调制解调器,UMPC/笔记本电脑无线数据通信以及手提设备.本文介绍了MIC2829主要特性,方框图, 典型应用框图及其材料清单, MIC2829 评估板电路图和所用板材料清单(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应用:

• 4G LTE USB modems

• 3G/4G (HEDGE/LTE) wireless chipsets

• WiMAX modems

• Express card modems

• UMPC/notebook PC wireless data communications

• Portable applications


图1.MIC2829功能方框图

图2.MIC2829典型应用框图
典型应用材料清单(BOM):

MIC2829评估板

图3.MIC2829 评估板电路图
MIC2829 评估板材料清单(BOM):