MAX749ESA+

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

Applications

Power Management, Portable Devices, Consumer Electronics

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party