MAX17031ETG+;MAX17031ETG+T;中文规格书,Datasheet资料.pdf

19-4305; Rev 0; 10/08 KIT EVALUATION AVAILABLE Dual Quick-PWM Step-Down Controller with Low- Power LDO and RTC Regulator for MAIN Supplies General Description Features M The MAX17031 is a dual Quick-PWM™ step-down Dual Quick-PWM A X power-supply (SMPS) controller with synchronous recti- Preset 5V and 3.3V Outputs fication, intended for main 5V/3.3V power generation in battery-powered systems. Low-side MOSFET sensing Internal 100mA, 5V Linear Regulator 1 provides a simple low-cost, highly efficient current Internal OUT1 LDO5 Bypass Switch 7 sense for valley current-limit protection. Combined with Secondary Feedback (SKIP Input) Maintains 0 3 the output overvoltage and undervoltage protection fea- Charge Pump tures, this current limit ensures robust output supplies. The 5V/3.3V SMPS outputs can save power by operat- 3.3V, 5mA Real-Time Clock (RTC) Power (Always 1 On) ing in pulse-skipping mode or in ultrasonic mode to avoid audible noise. Ultrasonic mode forces the con- 2V ±1% 50µA Reference troller to maintain swit