MAX25222C

PRODUCTION

Automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer and ASIL B Features

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

Data Sheet (Rev. 1)
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Overview

  • 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
    • NTC Input for Temperature Measurement/Compensation
  • Low EMI
    • 420kHz/2.1MHz Switching Frequency with Spread Spectrum
  • I2C Control/Diagnostic Interface with FLTB (Interrupt) Output
    • UV Diagnostics on All Outputs
    • OV Dagnostics on All Outputs
    • Bandgap Reference Out of Range
    • Stuck FLTB Pin
    • Communication Parity Check
    • VCOM DAC Fault
  • 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

The MAX25222/MAX25222C are a 4-channel TFT-LCD power ICs that provide 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.

The devices contain 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 available after the device has been programmed.

The temperature sensor interface block measures the temperature, optionally allowing the VCOM output voltage to be adjusted depending on the measured temperature. The MAX25222/MAX25222C2 includes extensive diagnostics to aid in fulfilling ASIL-B safety level.

The MAX25222/MAX25222C is available in a TQFN package and operate in the -40°C to 125°C temperature range.

Applications

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters
MAX25222C
Automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer and ASIL B Features
MAX25222: TTypical Application Circuit
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Switching Regulators & Controllers 2
MAX25220
PRODUCTION Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer
MAX25221
PRODUCTION Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer
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Tools & Simulations

Software Development 2

IBIS Model 1

Evaluation Kits

MAX25222EVSYS

Evaluation Kit for the MAX25222/MAX25222C

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Features and Benefits

  • 2.65V to 5.5V Input Range
  • Default Output Voltages
    • 6.8V Output at 200mA (Boost Converter)
    • -6.8V Output at -200mA (Inverting Regulator)
    • 12V Output at 15mA (Positive-Charge Pump Regulator)
    • -10V Output at 15mA (Negative-Charge Pump Regulator)
    • -2.49V Output at 100mA (VCOM Buffer)
  • The EV kit components will fit the 2.1MHz frequency. For using 420kHz, HW changes are needed.
  • Spread Spectrum
  • Dedicated GUI
  • Full Sequencing Flexibility
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX25222 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB used to evaluate MAX25222/MAX25222C automotive 4-channel TFT-LCD power supply with VCOM Buffer. Each output rail (AVDD, NAVDD, VGON, VGOFF, and VCOM) can be independently adjusted through I2C. The EV kit demonstrates the device’s features: adjustable output voltage, fault protection, VCOM temperature compensation, nonvolatile memory programming, and extensive diagnostics to aid in fulfilling ASIL-B safety level.

The EV kit exposes an I2C interface which can operate in conjunction with the MINIQUSB+ adapter or a third party I2C master like a general-purpose microcontroller. The EV kit also includes Windows®-compatible software that provides a simple graphical user interface (GUI) for exer- cising the features of the IC. The EV system includes both the EV kit and the MINIQUSB+ adapter board.

Applications

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters

MAX25222EVKIT

Evaluation Kit for the MAX25222/MAX25222C

Buy Now View Details

Features and Benefits

  • 2.65V to 5.5V Input Range
  • Default Output Voltages
    • 6.8V Output at 200mA (Boost Converter)
    • -6.8V Output at -200mA (Inverting Regulator)
    • 12V Output at 15mA (Positive-Charge Pump Regulator)
    • -10V Output at 15mA (Negative-Charge Pump Regulator)
    • -2.49V Output at 100mA (VCOM Buffer)
  • The EV kit components will fit the 2.1MHz frequency. For using 420kHz, HW changes are needed.
  • Spread Spectrum
  • Dedicated GUI
  • Full Sequencing Flexibility
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX25222 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB used to evaluate MAX25222/MAX25222C automotive 4-channel TFT-LCD power supply with VCOM Buffer. Each output rail (AVDD, NAVDD, VGON, VGOFF, and VCOM) can be independently adjusted through I2C. The EV kit demonstrates the device’s features: adjustable output voltage, fault protection, VCOM temperature compensation, nonvolatile memory programming, and extensive diagnostics to aid in fulfilling ASIL-B safety level.

The EV kit exposes an I2C interface which can operate in conjunction with the MINIQUSB+ adapter or a third party I2C master like a general-purpose microcontroller. The EV kit also includes Windows®-compatible software that provides a simple graphical user interface (GUI) for exer- cising the features of the IC. The EV system includes both the EV kit and the MINIQUSB+ adapter board.

Applications

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters
MAX25222EVSYS
Evaluation Kit for the MAX25222/MAX25222C
MAX25222EVKIT
Evaluation Kit for the MAX25222/MAX25222C

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