Product Descriptions
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. 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.
Product 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
Product Applications
Notebook Computers
Laptop Computers
Palmtop Computers
Personal Digital Assistants
Communicating Computers
Portable Data-Collection Terminals
Product Specification
| Attribute | Attribute value |
| ANSM-Part# | ANSM-MAX749CSA-T |
| Category | Integrated Circuits (ICs) |
| Power Management (PMIC) | |
| Power Management - Specialized | |
| Manufacturer | - |
| Packaging | Tape & Reel (TR) |
| Part Status | Obsolete |
| Applications | LCD Display |
| Current - Supply | 60µA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 8-SOIC |
| Base Product Number | MAX749 |
Product Photos
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