Power management IC

Introduction

pmic (Power Management IC) is also called Power Management IC is a specific integrated circuit, Function is to manage power for management, etc.

PMIC is often used in a battery as a power source, such as a mobile phone or portable media player. Since such devices generally have more than one power supply (such as battery and USB power), the system requires a plurality of different voltages of power, coupled with the charge and discharge of the battery to meet such demand in the traditional way, it will take a lot of space, At the same time, the product development time is increased, so it has created the emergence of PMIC.

Function

PMIC's main function is to control power flow and flow direction to match the main system needs. In multiple power supplies (eg, external real current, battery, USB power supply, etc.), select, allocate power to the main system, such as providing a plurality of different voltages, and is responsible for charging internal batteries. Because the system is used in more than the battery, it uses high-conversion efficiency design to reduce power loss.

PMIC is more than one function, including:

• DC - DC converter

• Low pressure difference regulator (LDO)

• battery charger

• power selection

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• Dynamic voltage regulation

• each power is turned on, close sequence control

• each of the power voltages Detection

• temperature detection

• other features

due to need Coordination with the main system, therefore need to communicate with the main system, usually use a series of connected interfaces such as I2C or SPI, and some of the functionally simple PMIC will directly connect to the MCU's GPIO.

Part of the PMIC can be used to connect the backup power supply to the real-time clock, and some will have a simple power status indication, such as using the LED display battery charge.

Some PMIC is designed for a particular series of MCUs, and companies that develop corresponding MCUs will have ready-to-art parts to support the PMIC.

IC manufacturer

Due to the very popular mobile device in battery operation, plus various processor design, producers also design special PMICs, make multiple semiconductors The company also has a design, producing PMIC, the following is some manufacturers:

• Intel Intel

• Gao Tong Qualcomm

• Uniform Technology Mediatek

• Ansen USDUCTOR

• Freescale Freescale

• US letter integrated product Maxim

• linear technology

See

• PMU

• switching power supply

• charger