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MAX749 - Digitally Adjustable LCD Bias Supply

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-toanalog converter (DAC).

Features

  • o +2.0V to +6.0V Input Voltage Range o Flexible Control of Output Voltage: Digital Control Potentiometer Adjustment PWM Control o Output Voltage Range Set by One Resistor o Low, 60µA Max Quiescent Current o 15µA Max Shutdown Mode o Small Size.
  • 8-Pin SO and Plastic DIP Packages MAX749 ________________________.

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Datasheet preview – MAX749

Datasheet Details

Part number MAX749
Manufacturer Maxim
File Size 105.78 KB
Description Digitally Adjustable LCD Bias Supply
Datasheet download datasheet MAX749 Datasheet
Additional preview pages of the MAX749 datasheet.

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Full PDF Text Transcription

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19-0143; Rev 1; 2/95 NUAL KIT MA ATION HEET S A EVALU T A WS D FOLLO Digitally Adjustable LCD Bias Supply _______________General 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-toanalog converter (DAC). Only seven small surfacemount 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.
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