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MAX17122 Datasheet Boost-Buck Regulator

Manufacturer: Maxim Integrated (now Analog Devices)

Overview:   _ MAX17122 19-4951; Rev 1; 11/09 EVAALVUAAILTAIOBNLEKIT Step-Up, Step-Down Regulator, Gate-On Charge Pump, and Boost-Buck Regulator for TV TFT LCD Display.

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General Description

The MAX17122 multiple-output power-supply IC generates all the supply rails for thin-film transistor (TFT) liquidcrystal display (LCD) TV panels.

It can operate from 8V to 16.5V input voltages and is optimized for LCD TV panel applications running directly from 12V regulated supplies.

It includes a 22V internal-switch step-down regulator for digital logic, a 22V internal switch stepup regulator to power the TFT source drivers, and a temperature-compensated 36V internal-switch boostbuck regulator that produces a negative output that can vary according to the temperature sensed by an external NTC thermistor.

Key Features

  • include an external-capacitor-timed, open-drain, power-good output that monitors the stepdown regulator’s feedback and a simple untimed output that monitors the positive charge-pump linear regulator’s feedback. A high-voltage stress function is available for the step-up regulator output. The GATE output directly drives an external p-channel MOSFET to provide True ShutdownK of the step-up output. The MAX17122 is available in a 6mm x 6mm, 40-pin thin QFN lead-free package and operates over the -40.

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