What Is a PMIC (Power Management IC)?
A PMIC (Power Management IC) is a power-management chip that produces and manages many different power rails on a single chip for a device. It reduces the power section of complex digital systems to a single part.
What Does It Do?
A modern phone processor needs different voltages: core, memory, RF, camera... A PMIC supplies all of these at once with its internal multiple buck and LDO blocks.
Typical Functions
| Function | Explanation |
|---|---|
| Multiple regulators | Several voltage rails |
| Power sequencing | Turning rails on in the right order |
| Battery charging | Charge management |
| Protection | Overcurrent/overheat shutdown |
Why Is It Used?
A single chip instead of dozens of separate regulators gives less space, lower cost and central control. Through an interface like I2C the voltages can be adjusted from software.
Where Is It Used?
Standard in phones, tablets, wearables, SoC-based boards and IoT modules.
Power Sequencing
Many processors want the core and I/O voltages to turn on and off in a specific order. A PMIC manages this sequencing internally to prevent damage to the chip; this behavior can usually be configured from software over the I2C interface.
Common Mistakes
- Wrong PMIC: a PMIC is usually designed for a specific processor; it isn't chosen at random.
- Skipping sequencing: if the power-rail turn-on order is wrong, the chip can be damaged.
- Thermal: since a lot of power is gathered on one chip, heat management matters.
Frequently Asked Questions
What's the difference between a PMIC and a regulator?+
Is a PMIC programmable?+
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