engineering

Power management integrated circuit

Power management integrated circuit is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Power management integrated circuit rather than just read about it. In short: A power management integrated circuit (PMIC) is a multi-function integrated circuit that is used to perform power conversion and control power distribution in an electronic device. A PMIC reduces the number of components that would otherwise be necessary for the functions it provides, thus reducing the required circuit board space and improving reliability.

Key takeaways

Power management integrated circuit belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Power management integrated circuit to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Power management integrated circuit from memory before moving on to harder problems.

Reference excerpt

A power management integrated circuit (PMIC) is a multi-function integrated circuit that is used to perform power conversion and control power distribution in an electronic device. A PMIC reduces the number of components that would otherwise be necessary for the functions it provides, thus reducing the required circuit board space and improving reliability. For example, a PMIC typically includes several DC/DC converters or their control mechanisms. PMICs are widely used in computers, battery-powered devices (e.g., mobile phones, tablet computers) and embedded devices.

Overview Many electronic circuits require multiple power supply voltages (e.g., 5 V, 3.3 V, 1.8 V). PMICs are used to control the delivery of electrical power to such circuits. A PMIC integrates various functions related to producing or conveying power supply voltages to external circuitry. Typically, the specific functions provided by any particular PMIC are unique to that PMIC model. Commonly provided functions include:

DC-to-DC conversion Voltage regulation Power sequencing Battery charging Power switching Voltage scaling In conjunction with these functions, a PMIC often will perform functions such as voltage supervision and undervoltage lockout. Integrating these functions into one IC makes for better conversion efficiency, smaller circuit size, and better heat dissipation.

Features A PMIC may include a DC to DC converter to allow dynamic voltage scaling. Some models have up to 95% power conversion efficiency. Some models integrate with dynamic frequency scaling to support dynamic voltage and frequency scaling (DVFS). Some models can be configured via an I²C or SPI serial communication bus. 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).

Illustrations

Worked examples

Example 1 — a first encounter with Power management integrated circuit

Start with the simplest possible case. Write down what Power management integrated circuit claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Power management integrated circuit before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Power management integrated circuit ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Power management integrated circuit

In research: Power management integrated circuit appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Power management integrated circuit in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Power management integrated circuit is common in secondary-school and first-year university syllabi. It links to neighbouring topics Integrated circuits, Motherboard, so understanding it makes those chapters shorter.
In everyday life: Look for Power management integrated circuit outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Power management integrated circuit in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Power management integrated circuit means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Power management integrated circuit out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Power management integrated circuit in simple terms?

Why does Power management integrated circuit matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Power management integrated circuit?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Power management integrated circuit.