基于MIC2829设计的3G-4G USB无线应用电源技术_技术

MIC2829是Micrel公司的高度集成的电源管理集成电路

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 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