Power management integrated circuit

Power management integrated circuits (power management ICs or PMICs or PMU as unit) are integrated circuits for power management. Although PMIC refers to a wide range of chips (or modules in system-on-a-chip devices), most include several DC/DC converters or their control part. A PMIC is often included in battery-operated devices such as mobile phones and portable media players to decrease the amount of space required.

A PMIC on the inside. This is a die shot of an Apple 338S1164 PMIC manufactured by Dialog Semiconductors.

MediaTek MT6329BA in a LG mobile phone

Overview

The term PMIC refers to a class of integrated circuits that perform various functions related to power requirements. A PMIC may have one or more of the following functions:[1]

Power management ICs are solid state devices that control the flow and direction of electrical power. Many electrical devices have multiple internal voltages (e.g., 5 V, 3.3 V, 1.8 V, etc.) and sources of external power (e.g., wall outlet, battery, etc.), meaning that the power design of the device has multiple requirements for operation. A PMIC can refer to any chip that is an individual power related function, but generally refer to ICs that incorporate more than one function such as different power conversions and power controls such as voltage supervision and undervoltage protection. By incorporating these functions into one IC, a number of improvements to the overall design can be made such as better conversion efficiency, smaller solution size, and better heat dissipation.[2]

Features

A PMIC may include battery management, voltage regulation, and charging functions. It may include a DC to DC converter to allow dynamic voltage scaling. Some models are known to feature up to 95% power conversion efficiency. Some models integrate with dynamic frequency scaling in a combination known as DVFS (dynamic voltage and frequency scaling).

It may be manufactured using BiCMOS process. They may come as QFN package. Some models feature I²C or SPI serial bus communications interface for I/O.

Some models feature a low-dropout regulator (LDO), and a real-time clock (RTC) co-operating with a backup battery.

A PMIC can use pulse-frequency modulation (PFM) and pulse-width modulation (PWM). It can use switching amplifier (Class-D electronic amplifier).

IC manufacturers

Samsung Semiconductor, Ricoh Electronic Devices, Power Integrations,STMicroelectronics, Infineon Technologies AG, Intel, Marvell Semiconductor, Qualcomm, MediaTek, IXYS, Freescale Semiconductor,[3] Dialog Semiconductor, Silicon Mitus,[4] Exar, International Rectifier, Intersil, Cypress Semiconductor, Maxim Integrated Products, Linear Technology, Renesas Electronics, Rohm Semiconductor, ON Semiconductor, Texas Instruments,[2] and Asahi Kasei Microdevices are some of many manufacturers of PMICs.

gollark: > As long as our hypothetical Blub programmer is looking down the power continuum, he knows he's looking down. Languages less powerful than Blub are obviously less powerful, because they're missing some feature he's used to. But when our hypothetical Blub programmer looks in the other direction, up the power continuum, he doesn't realize he's looking up. What he sees are merely weird languages. He probably considers them about equivalent in power to Blub, but with all this other hairy stuff thrown in as well. Blub is good enough for him, because he thinks in Blub.
gollark: Imagine YOU are a BLUB programmer.
gollark: Imagine a language which is UTTERLY generic in expressiveness and whatever, called blub.
gollark: There's the whole "blub paradox" thing.
gollark: Assembly FAIRLY unbased.

See also

References
  1. http://www.linear.com/products/power_management
  2. "Power Management Guide" (PDF) (R ed.). Texas Instruments. 2018. SLVT145. Retrieved 15 January 2019.
  3. http://www.freescale.com/webapp/sps/site/overview.jsp?code=POWR_MAN_USER_INTERFACE
  4. http://www.siliconmitus.com/
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