1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter

High-Power Low-Noise 1MHz Step-Up DC-DC Converter
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Active: In Production.


The MAX1763 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device maintains exceptionally low quiescent supply current (110µA) despite its high 1MHz operating frequency. Small external components and a tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.

The MAX1763 uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single Lithium-ion (Li+) cell. Maxim's proprietary Idle Mode™ circuitry significantly improves efficiency at light load currents while smoothly transitioning to fixed-frequency PWM operation at higher load currents to maintain excellent full-load efficiency. Low-noise, forced-PWM mode is available for applications that require constant-frequency operation at all load currents. The MAX1763 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.

The MAX1763 includes an on-chip linear gain block that can be used to build a high-power external linear regulator or as a low-battery comparator. Soft-start and current limit functions permit optimization of efficiency, external component size, and output voltage ripple.

The MAX1763 is available in a space-saving 16-pin QSOP package or a high-power (1.5W) 16-pin TSSOP-EP package.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 660kB)
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An evaluation board is available: MAX1763EVKIT

Key Features

  • Up to 94% Efficiency
  • +0.7V to +5.5V Input Voltage Range
  • 1.1V Guaranteed Startup Input Voltage
  • Up to 1.5A Output
  • Fixed 3.3V Output or Adjustable (2.5V to 5.5V)
  • 1MHz PWM Synchronous-Rectified Topology
  • 1µA Logic-Controlled Shutdown
  • Analog Gain Block for Linear-Regulator or Low-Battery Comparator
  • Adjustable Current Limit and Soft-Start
  • 1.5W TSSOP Package Available


  • Digital Cordless Phones
  • Handheld Instruments (PDAs, Palmtops)
  • Palmtop Computers
  • PCS Phones
  • Personal Communicators
  • Wireless Handsets

Key Specifications:

Step-Up Switching Regulators
Part Number VIN
Preset VOUT
IOUT1 (max)
Output Adjust. Method Switch Type Synchronous Switching DC-DC Outputs Oper. Freq.
min max min max See Notes
MAX1763  0.7 5.5 2.5 5.5 3.3 1.5
Internal Yes 1 1000 $2.96 @1k
See All Step-Up Switching Regulators (96)

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.


MAX1763: Typical Operating Circuit
Typical Operating Circuit

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Information Index

Document Ref.: 19-1698 Rev 2; 2011-05-02
This page last modified: 2011-05-02