MAX749

PRODUCTION

Digitally Adjustable LCD Bias Supply

Capable for generating >-100V

Data Sheet (Rev. 1) Product Selection Table

Part Models: 5
1ku List Price: Starting From $3.83

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Overview

+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

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.

Applications

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

Part Models: 5
1ku List Price: Starting From $3.83

Documentation

Data Sheet 1

MAX749: Digitally Adjustable LCD Bias Supply Data Sheet (Rev.1) 02/01/1995

Technical Articles 1

Linear Regulators in Portable Applications 07/22/2002

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX749CPA+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX749CSA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX749CSA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX749ESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX749ESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 30, 2020 - 1702R2 ASSEMBLY
		pcn_1702r2
MAX749CSA+	PRODUCTION
MAX749CSA+T	PRODUCTION
MAX749ESA+	PRODUCTION
MAX749ESA+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 1
MAX774	PRODUCTION	-5V/-12V/-15V or Adjustable, High-Efficiency, Low I_Q Inverting DC-to-DC Controllers

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