MAX17031 Datasheet | Maxim Integrated

Description The MAX17031 is a dual Quick-PWM™ step-down power-supply (SMPS) controller with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems. Low-side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. bined with the output overvoltage and undervoltage protection features , this current limit ensures robust output supplies. The 5V/3.3V SMPS outputs can save power by operating in pulse-skipping mode or in ultrasonic mode to avoid audible noise. Ultrasonic mode forces the controller to maintain switching frequencies greater than 20k Hz at light loads. The SKIP input also has an accurate logic threshold, allowing it to be used as a secondary feedback input to refresh an external charge pump or secondary winding without overcharging the output voltages. An internal 100m A linear regulator generates the 5V bias needed for power-up or other low-power “alwayson” suspend supplies. An internal bypass circuitry allows automatic bypassing of the linear regulator when the 5V SMPS is active. The device includes independent shutdown controls with well-defined logic thresholds to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms period. To prevent the output from ringing below ground in shutdown, the internal voltage target is ramped down from its previous value to zero over a 1ms period. A bined power-good (PGOOD) output simplifies the interface with external controllers. The MAX17031 is available in a 24-pin thin QFN (4mm x 4mm) package. o Dual Quick-PWM o Preset 5V and 3.3V Outputs o Internal 100m A, 5V Linear Regulator o Internal OUT1 LDO5 Bypass Switch o Secondary Feedback (SKIP Input) Maintains Charge Pump o 3.3V, 5m A Real-Time Clock (RTC) Power (Always On) o 2V ±1% 50µA Reference o 6V to 24V Input Range o Pulse-Skipping/Forced-PWM/Ultrasonic Mode...