Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer

The MAX25220/MAX25221/MAX25221B/MAX25221C are a 4-channel TFT-LCD power IC that provides symmetrical positive AVDD and negative 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/B/C).

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/MAX25221B/MAX25221C are available in a TQFN package and operates in the -40°C to +125°C temperature range.

Applications

* Central Information Displays * Infotainment Displays * Instrument Clusters

* 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) * Controlled Sequencing during Power-On and Power-Off of All Rails * VCOM Output Range +1V to -2.49V in 6.83mV Steps (MAX25221/B/C) * NTC Input for Temperature Measurement/Compensation (MAX25221/B/C)

* 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

* ​AEC-Q100 Grade 1