Description

Micro PMU with 1.2 A Buck, Two 300 mA LDOs, Supervisory, Watchdog, and Manual Reset Features: Input voltage range: 2.3 V to 5.5 V One 1.2 A buck regulator Two 300 mA LDOs 20-lead, 4 mm × 4 mm LFCSP package Overcurrent and thermal protection Soft start Undervoltage lockout Open-drain processor reset with externally adjustable threshold monitoring Guaranteed reset output valid to VAVIN = 1 V Manual reset input Watchdog refresh input Buck key specifications Output voltage range: 0.8 V to 3.8 V Current mode topology for excellent transient response 3 MHz operating frequency Peak efficiency up to 96% Uses tiny multilayer inductors and capacitors Mode pin selects forced PWM or auto PWM/PSM mode 100% duty cycle low dropout mode LDOs key specifications Output voltage range: 0.8 V to 5.2 V Low input supply voltage from 1.7 V to 5.5 V Stable with 2.2 μF ceramic output capacitors High PSRR Low output noise Low dropout voltage −40°C to +125°C junction temperature range