MAX749
PRODUCTIONDigitally Adjustable LCD Bias Supply
Capable for generating >-100V
- Part Models
- 5
- 1ku List Price
- Starting From $4.84
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
Documentation
Data Sheet 1
Technical Articles 1
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) | ||
| MAX749CSA+ | Small-Outline IC Narrow (0.15in) | ||
| MAX749CSA+T | Small-Outline IC Narrow (0.15in) | ||
| MAX749ESA+ | Small-Outline IC Narrow (0.15in) | ||
| MAX749ESA+T | Small-Outline IC Narrow (0.15in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 30, 2020 - 1702R2 ASSEMBLY |
||
| MAX749CSA+ | PRODUCTION | |
| MAX749CSA+T | PRODUCTION | |
| MAX749ESA+ | PRODUCTION | |
| MAX749ESA+T | PRODUCTION | |
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX749CSA+T | PRODUCTION | |
| MAX749ESA+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 1 | ||
| MAX774 | PRODUCTION | -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers |
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