MAX749CSA+

MAX749CSA+ is a digitally adjustable LCD bias supply. 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 the size of external components. Quiescent current is only 60µA max and is reduced to under 15µA in shutdown mode. While shut down, this retains the voltage set point, simplifying software control. It drives either an external P-channel MOSFET or a PNP transistor. Typical applications are notebook computers, laptop computers, palmtop computers, personal digital assistants, communicating computers, portable data-collection terminals.

• 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 maximum quiescent current
• 15µA maximum shutdown mode
• Supply rejection is 1.5%IFBS maximum (V+ = 2V to 6V, full-count current)
• Minimum reset pulse width is 125ns typical (V+ = 2V, TA = +25°C)
• DLOW on resistance is 5ohm typical (V+ = 2V, VDLOW = 0.5V)
• 0°C to +70°C temperature range
• 8-pin SO package

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