Automotive 4-Channel TFT-LCD Power Supply with VCOM buffer

Industry's First High Integrated Automotive 4-Ch TFT Bias with I2C and VCOM

Please check latest availability status for a specific part variant.


The MAX25220/MAX25221 is a 4-channel TFT-LCD pow- er IC that provides symmetrical positive AVDD and nega- tive NAVDD supplies as well as VGON and VGOFF gate supplies. In addition, a VCOM buffer with output voltage range above and below ground and a temperature measurement block are integrated (MAX25221).

The device contains non-volatile memory so that the values of all outputs can be calibrated for the lifetime of the device (maximum five times).

Programming is carried out using the built-in I2C interface, which can also be used to read back diagnostic information. A stand-alone mode is also available.

The temperature sensor interface block measures the temperature optionally allowing the VCOM output voltage to be adjusted depending on the measured temperature.

The MAX25220/MAX25221 is available in a TQFN package and operates in the -40°C to 125°C temperature range.

MAX25221: Typical Application Circuit MAX25221: Typical Application Circuit Enlarge+

Key Features

  • High Integration
    • Synchronous Boost Provides AVDD of 4.2V to 10.5V at up to 200mA
    • NAVDD Inverter Output at up to -200mA
    • 15mA VGON Output (7.6V to 20.2V) from 3x Regulated Charge Pump
    • VGOFF (-18.2V to -5.6V) from Regulated Charge Pump at up to -15mA (charge-pump doubler)/li>
    • Controlled Sequencing during Power-On and Power-Off of All Rails
    • VCOM Output Range +1V to -2.49V in 6.83mV Steps (MAX25221)
    • NTC Input for Temperature Measurement/Compensation (MAX25221)
  • Low EMI
    • 420kHz/2.1MHz Switching Frequency with Spread Spectrum
  • I2C Control/Diagnostic Interface with FLTB (Interrupt) Output
    • UV diagnostics on All Outputs
  • Versatile
    • Non-Volatile Output Voltage Settings on AVDD/NAVDD, VGON, VGOFF, VCOM, and Sequencing
    • Supports Stand-Alone Operation Mode after Programming
    • Compact 5mm x 5mm TQFN32 Package
  • ​AECQ100 Grade 1


  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters

MAX25221EVKIT: Evaluation Kit for the MAX25220, MAX25221
MAX25221EVSYS: Evaluation Kit for the MAX25220, MAX25221
Request Reliability Report for: MAX25221 
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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Related Resources

Automotive 4-Channel TFT-LCD Power Supply with VCOM buffer

  • High Integration
  • Low EMI
  • I2C Control/Diagnostic Interface with FLTB (Interrupt) Output