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MAX749

MAX749

Digitally Adjustable LCD Bias Supply

Capable for generating >-100V

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Overview

Description

The MAX749 generates negative LCD-bias contrast voltages from 2V to 6V inputs. Full-scale output voltage can be scaled to -100V or greater, and is digitally adjustable in 64 equal steps by an internal digital-to-analog converter (DAC). Only seven small surface-mount components are required to build a complete supply. The output voltage can also be adjusted using a PWM signal or a potentiometer.

A unique current-limited control scheme reduces supply current and maximizes efficiency, while a high switching frequency (up to 500kHz) minimizes the size of external components. Quiescent current is only 60µA max and is reduced to under 15µA in shutdown mode. While shut down, the MAX749 retains the voltage set point, simplifying software control. The MAX749 drives either an external P-channel MOSFET or a PNP transistor.
MAX749: Typical Operating Circuit MAX749: Typical Operating Circuit Enlarge+

Key Features

  • +2.0V to +6.0V Input Voltage Range
  • Flexible Control of Output Voltage:
    • Digital Control
    • Potentiometer Adjustment
    • PWM Control
  • Output Voltage Range Set by One Resistor
  • Low, 60µA Max Quiescent Current
  • 15µA Max Shutdown Mode
  • Small Size - 8-Pin SO and Plastic DIP Packages

Applications/Uses

  • Communication Systems
  • Laptop Computers
  • Notebook Computers
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Portable Data-Collection Terminals

Parametric Specs

See parametric specs for Inverting Switching Regulators (22)


Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		IOUT1
(A)		Switch TypeOper. Freq.
(kHz)		FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX749 26-2-1000.1External500
Current Limit
Fixed Freq./PWM
PDIP/8
SOIC (N)/8
$2.93 @1k

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.

Design Resources

Technical Documents

Tutorial 751 Linear Regulators in Portable Applications

Quality And Environmental

Request Reliability Report for: MAX749 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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    Technical Docs

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    Tutorial 751 Linear Regulators in Portable Applications

    Reference Designs

    Type ID Title
    Evaluation Board1164MAX749EVKIT Evaluation Kit for the MAX749