The MAX749ESA+ is a digitally adjustable LCD bias supply in 8 pin NSOIC package. It 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 analogue 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 size of external components. Quiescent current is only 60μA max and is reduced to under 15μA in shutdown mode. While shut down, IC retains voltage set point, simplifying software control. It drives either an external P-channel MOSFET or a PNP transistor. It is used in notebook, laptop & palmtop computers, personal digital assistants & communicating computers.
- Supply voltage range is 2V to 6V
- Operating temperature range from -40°C to 85°C
- Flexible control of output voltage, digital control, PWM control
- Potentiometer adjustment
- Output voltage range set by one resistor
- Low, 60μA max quiescent current
- Current of 15μA max in shutdown mode
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