Micrel’s 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 device incorporates six DC/DC buck converters, 11 LDOs and digital level shifters for SIM card support. Four of the buck converters incorporate HyperLight Load (HLL) technology; each of these buck regulators operate at high switching speed in PWM mode (4 MHz/2,5 MHz) and maintain high efficiency in light load conditions. The high-speed PWM operation allows the use of very small inductors and capacitors, while the HLL mode enables 87% efficiency at 1 mA. The remaining two 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.
Five general-purpose LDOs provide low dropout, 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) providing 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 50 mA SIM power supply.
The IC is available in a 76-pin 5,5 x 5,5 mm LGA package with an operating junction temperature range from –40°C to +125°C.
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