Dual Quick-PWM, Step-Down Controller with Low-Power LDO and RTC Regulator for MAIN Supplies

Highly Integrated and Best Fit for Notebook Main Power Requirements
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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. Combined 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 20kHz 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 100mA linear regulator generates the 5V bias needed for power-up or other low-power "always-on" 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 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.

Data Sheet

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Key Features

  • Dual Quick-PWM
  • Preset 5V and 3.3V Outputs
  • Internal 100mA, 5V Linear Regulator
  • Internal OUT1 LDO5 Bypass Switch
  • Secondary Feedback (SKIP Input) Maintains Charge Pump
  • 3.3V, 5mA Real-Time Clock (RTC) Power (Always On)
  • 2V ±1% 50µA Reference
  • 6V to 24V Input Range
  • Pulse-Skipping/Forced-PWM/Ultrasonic Mode Control
  • Independent SMPS and LDO5 Enable Controls
  • Combined SMPS PGOOD Outputs
  • Minimal Component Count


  • 2 to 4 Li+ Cells Battery-Powered Devices
  • Main System Supply (5V and 3.3V Supplies)
  • Notebook Computers
  • Telecommunication
  • Ultra-Mobile PC

Key Specifications:

Step-Down Switching Regulators
Part Number VIN
Preset VOUT
Output Adjust. Method IOUT1 (max)
Switch Type Synchronous Switching Power Good Signal DC-DC Outputs Oper. Freq.
min max min max See Notes
MAX17031  6 24 3.3 5
Preset 10 External Yes Yes 2 300 $3.89 @1k
See All Step-Down Switching Regulators (310)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX17031: Functional Diagram Overview
Functional Diagram Overview

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New Product Press Release   2009-04-28 ]

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Document Ref.: 19-4305 Rev 0; 2008-10-30
This page last modified: 2009-07-27