Evaluation Kit for the MAX1997

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The MAX1997 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that provides voltages and features required for active-matrix thin-film transistor (TFT) liquid-crystal displays. The EV kit contains a step-up switching regulator, a positive three-stage charge pump and linear regulator for the TFT gate-on supply, a negative three-stage charge pump and linear regulator for the TFT gate-off supply, a gamma reference, a low-voltage logic supply, and a high-current backplane buffer. The gate-on supply, gate-off supply, and gamma reference supply can be sequenced in any power-up order.

The EV kit operates from a DC supply voltage of +2.7V to +5.5V. The step-up switching regulator is configured for a +9V output providing up to 250mA. The positive charge pump and regulator are configured for a +20V output using two charge-pump stages providing up to 10mA. The negative charge pump and regulator are configured for a -7V output using a single charge-pump stage providing up to 10mA. The gamma reference is configured for +8.6V providing up to 10mA. The low-voltage logic linear-regulator is configured for +2.5V, providing up to 200mA. The backplane buffer is configured for +4.3V and can source or sink current peaks more than 300mA.

The MAX1997 EV kit demonstrates low-quiescent current and high efficiency (85%) for maximum battery life. The EV kit features overload protection for the input and all outputs. Operation at 1.5MHz allows the use of tiny surface-mount components. The MAX1997 QFN package (0.8mm max) with low-profile external components allows this circuit to be less than 1.25mm high.

Key Features

  • +2.7V to +5.5V Input Range
  • Output Voltages
    • +9V Output at 250mA (Step-Up Switching Regulator)
    • +20V Output at 10mA (Positive Charge Pump and Linear Regulator)
    • -7V Output at 10mA (Negative Charge Pump and Linear Regulator)
    • +8.6V Output at 30mA (Gamma Reference Regulator)
    • +2.5V Output at 200mA from 2.7V to 3.6V Input (Low-Voltage Logic Supply)
    • +4.3V Output (±300mA Peak Backplane Buffer Output)
  • Up to Three Positive and Three Negative Charge-Pump Stages
  • More than -20V Linear-Regulated Output (Resistor Adjustable)
  • More than +30V Linear-Regulated Output (with Additional Circuitry)
  • Greater than 85% Efficiency (Step-Up Switching Regulator)
  • 375kHz/750kHz/1.5MHz Selectable Step-Up Switching Frequency (Configured for 1.5MHz)
  • Programmable Power-Up Sequencing and Soft-Start for All Outputs
  • Multilevel Protection
    • Output Undervoltage Protection
    • Input Overcurrent Protection
    • Input Switch Disconnects Step-Up Output from Input Source
    • Selectable Fault-Delay Period
  • Low-Profile Surface-Mount Components
  • Fully Assembled and Tested


  • Car-Navigation Displays
  • LCD Monitors
  • Notebook Computer Displays
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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