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

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

产品详情

The MAX25220/MAX25221/MAX25221B 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).

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

主要特征

  • 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

应用/用途

  • 中央信息显示屏
  • 信息娱乐系统显示屏
  • 仪表盘
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.65
VIN (V) (max) 5.5
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
# LDO Outputs 1
VOUT (V) (min) -10.5
VOUT (V) (max) 10.5
Package/Pins TQFN-CU/32
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简化框图

MAX25221: Typical Application Circuit MAX25221: Typical Application Circuit Zoom icon

技术文档

设计与质量

单击下面的标题以查看详情页面

描述

The MAX25221 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB used to evaluate MAX25221 and MAX25221B automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer or the MAX25220 automotive 4-Channel TFT-LCD Power Supply without VCOM. Each output rail (AVDD, NAVDD, VGON, VGOFF and VCOM) can be independently adjusted via I2C. The EV kit demonstrates the device’s features: adjustable output voltage, fault protection, VCOM temperature compensation, and non-volatile memory programming. 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 exercising the features of the IC. The EV system includes both the EV kit and the MINIQUSB+ adapter board.

查看详情

特征

  • 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 Fit the 2.1MHz Frequency; for Using 420kHz, Hardware Changes Are Needed
  • Spread Spectrum
  • Dedicated GUI
  • Full Sequencing Flexibility
  • Proven PCB Layout
  • Fully Assembled and Tested

描述

The MAX25221 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB used to evaluate MAX25221 and MAX25221B automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer or the MAX25220 automotive 4-Channel TFT-LCD Power Supply without VCOM. Each output rail (AVDD, NAVDD, VGON, VGOFF and VCOM) can be independently adjusted via I2C. The EV kit demonstrates the device’s features: adjustable output voltage, fault protection, VCOM temperature compensation, and non-volatile memory programming. 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 exercising the features of the IC. The EV system includes both the EV kit and the MINIQUSB+ adapter board.

查看详情

特征

  • 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 Fit the 2.1MHz Frequency; for Using 420kHz, Hardware Changes Are Needed
  • Spread Spectrum
  • Dedicated GUI
  • Full Sequencing Flexibility
  • Proven PCB Layout
  • Fully Assembled and Tested

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参量

Parametric specs for Multifunction PMICs
VIN (V) (min) 2.65
VIN (V) (max) 5.5
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
# LDO Outputs 1
VOUT (V) (min) -10.5
VOUT (V) (max) 10.5
Package/Pins TQFN-CU/32

主要特征

  • 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

应用/用途

  • 中央信息显示屏
  • 信息娱乐系统显示屏
  • 仪表盘

描述

The MAX25220/MAX25221/MAX25221B 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).

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

简化框图

MAX25221: Typical Application Circuit MAX25221: Typical Application Circuit Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索您所需的答案。

过滤搜索

Maxim专业的应用工程师团队也可以为您解答技术问题,请 访问Maxim的 支持中心