High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter


The MAX1708 sets a new standard of space savings for high-power, step-up DC-DC conversion. It delivers up to 10W at a fixed (3.3V or 5V) or adjustable (2.5V to 5.5V) output, using an on-chip power MOSFET from a 0.7V to 5V supply.

Fixed-frequency PWM operation ensures that the switching noise spectrum is constrained to the 600kHz fundamental and its harmonics, allowing easy postfiltering for noise reduction. External clock synchronization capability allows for even tighter noise spectrum control. Quiescent power consumption is less than 1mW to extend operating time in battery-powered systems.

Two control inputs (ONA, active-low ONB) allow simple push-on, push-off control through a single momentary push-button switch, as well as conventional on/off logic control. The MAX1708 also features programmable soft-start and current limit for design flexibility and optimum performance with batteries. The maximum RMS switch current rating is 5A. For a device with a higher (10A) switch current rating, refer to the MAX1709 data sheet.
MAX1708: Typical Operating Circuit MAX1708: Typical Operating Circuit Enlarge+

Key Features

  • On-Chip 5A Power MOSFET
  • 5V, 2A Output from a 3.3V Input
  • Fixed 3.3V or 5V Output Voltage or Adjustable (2.5V to 5.5V)
  • Input Voltage Range Down to 0.7V
  • Low Power Consumption
    • 1mW Quiescent Power
    • 1µA Current in Shutdown Mode
  • Low-Noise, Constant Frequency Operation (600kHz)
  • Synchronizable Switching Frequency (350kHz to 1000kHz)
  • Small QSOP Package


  • 3.6V or 5V RF PAs in Communications Handsets
  • Local 2.5V to 3.3V or 5V Conversion
  • Local 3.3V to 5V Conversion
  • Routers, Servers, Workstations, Card Racks
Part Number VIN
Preset VOUT
Output Adjust. Method Switch Type Shutdown Mode Supply Current
DC-DC Outputs Oper. Freq.
Package/Pins Budgetary
min max min max max typ See Notes
MAX1708  0.7 5 2.5 5
Internal 1 1 350
$4.62 @1k
See All Step-Up Switching Regulators (86)
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.

MAX1708EVKIT: Evaluation Kit for the MAX1708

Technical Documents

App Note 4406 Power Supply Features Low VIN and VOUT

Quality and Environmental Data

Product Reliability Reports: MAX1708.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources

2.75V to 4.8V Input, 10mA Output, 35µVRMS Ultra Low Noise and Ripple Boost Regulator

  • Ultra-Small Solution Size (< 7mm2)
  • 35µVRMS (typ) Output Ripple/Noise
  • 11.2V/10mA Output

60V, Dual-Output, Synchronous Step-Down Controller

  • Wide Range of Operation
  • Enhances Power Efficiency
  • Operates Reliably in Adverse Industrial Environments

4.5V–42V, 5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

  • Reduces External Components and Total Cost
  • Reduce Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

Type ID PDF Title
App Note 4406 Power Supply Features Low VIN and VOUT