power management ic

PMIC (Power Management IC) — dedicated chips or on-chip circuits that regulate, convert, and distribute power to all components in a system, critical for efficiency and battery life.

Core Functions

• DC-DC Converter (Buck/Boost): Efficiently convert one voltage to another
• Buck: Step down (e.g., 5V → 1.2V). 90-95% efficient
• Boost: Step up (e.g., 3.7V battery → 5V USB)
• Buck-Boost: Handle input above or below output

• LDO (Low Dropout Regulator): Linear regulator. Lower efficiency but ultra-clean output (low noise). Used for analog and RF supply

• Battery Management: Charging control, fuel gauge, protection (over-charge, over-discharge, over-temperature)

PMIC in a Smartphone

• Manages 20–30+ power rails from a single battery
• CPU: 0.5–1.0V (dynamic voltage scaling)
• Memory: 1.1V
• I/O: 1.8V, 3.3V
• Display: 5V+ (boost converter)
• Each rail needs different voltage, current, noise requirements

Key Metrics

• Efficiency: >90% for switching converters
• Ripple: <10mV for noise-sensitive rails
• Transient response: Fast voltage recovery during load steps
• Quiescent current: <1μA for standby mode

Market: $30B+ annually. Key players: Texas Instruments, Qualcomm, MediaTek, Dialog (Renesas), MPS

PMICs are the unsung heroes of electronics — every watt of power in every device passes through power management circuits.