MAX17031 Overview
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.
Key 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 20kHz at light loads
- An internal 100mA 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
- A combined 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 100mA, 5V Linear Regulator o Internal OUT1 LDO5 Bypass Switch o Secondary Feedback
