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.