1. Products
  2. Power Management
  3. Display Control and Power
  4. LCD/CCD/OLED Bias
  5. MAX1997


Features and Benefits

  • 2.7V to 5.5V Input Supply Range
  • Adjustable (Up to +13V) Output Voltage for Source-Driver ICs
  • Integrated High-Efficiency Power MOSFET
  • Linear-Regulator Controllers for TFT Gate-On and Gate-Off Supplies
  • High-Current VCOM Buffer (MAX1997 Only)
  • Two Additional Linear-Regulator Controllers (MAX1997 Only)
  • Programmable Power-Up Sequencing
  • Multiple Overload Protection with Thermal Shutdown
  • 1µA Shutdown Current
  • 32-Pin/20-Pin Thin QFN Packages
  • Product Details

    The MAX1997/MAX1998 provide the voltages required for active-matrix, thin-film transistor liquid-crystal displays (TFT LCDs). Both combine a high-performance step-up regulator with two linear-regulator controllers, input protection switch control, and flexible sequence programming. The MAX1997 contains two additional linear-regulator controllers and a VCOM buffer. The MAX1997/MAX1998 can operate from input supplies of 2.7V to 5.5V and feature multiple levels of protection circuitry, making them complete power-supply systems for displays.

    The main DC-to-DC converter provides the regulated supply voltage for the display's source-driver ICs. The converter is a high-frequency (up to 1.5MHz) step-up regulator with an integrated 14V N-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors while achieving efficiencies over 85%. Its current-mode control architecture provides fast transient response to pulsed loads. Internal soft-start and cycle-by-cycle current limit help prevent input surge currents.

    The positive and negative linear-regulator controllers postregulate charge-pump outputs for TFT gate-on and gate-off supplies. The three outputs can be sequenced in any order by selecting the appropriate external components. Both linear-regulator controllers, as well as the step-up regulator, have supply-sequencing control inputs.

    The MAX1997 features a high-current backplane driver (VCOM). This buffer provides peak currents exceeding 300mA (typ) and requires only a 0.47µF output filter capacitor. The MAX1997's two additional linear-regulator controllers can be used to build the gamma reference voltage and a logic supply.

    The MAX1997/MAX1998 have a unique input switch control that can replace the typical input supply fuse. When a fault is detected, the regulator is disconnected from the input supply. The fault detector monitors all the regulated output voltages and the current from the input supply. In addition, the MAX1997/MAX1998 enter shutdown when the internal overtemperature threshold is reached.

    The MAX1997 is available in a 32-pin thin QFN package and the MAX1998 is available in a 20-pin thin QFN package. Both packages have a maximum thickness of 0.8mm suitable for ultra-thin LCD panels.


    • Car-Navigation Displays
    • LCD Monitors
    • Notebook Computer Displays

    Product Categories

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Product Recommendations

    MAX1997 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX1997ETJ+ Material Declaration Reliability Data 32-LFCSP-5X5X0.75
    MAX1997ETJ+T Material Declaration Reliability Data 32-LFCSP-5X5X0.75
    Wafer Fabrication Data

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