MAX25221B
Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer
Industry's First High Integrated Automotive 4-Ch TFT Bias with I2C and VCOM
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Key Features
Applications/Uses
| VIN (V) (min) | 2.65 |
| VIN (V) (max) | 5.5 |
| # Step-Down Outputs | 2 |
| # Step-Up Outputs | 2 |
| # Inverting Outputs | 1 |
| VOUT (V) (min) | -10.5 |
| VOUT (V) (max) | 10.5 |
| Package/Pins | TQFN-CU/32 |
| Budgetary Price (See Notes) | 3.39 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer | Oct 22, 2021 | |
| App Note | Guide to Using the MAX25221 VCOM and Temperature Compensation in TFT-LCD Panels | ||
| solution | TFT-Bias for Automotive Applications |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
| VIN (V) (min) | 2.65 |
| VIN (V) (max) | 5.5 |
| # Step-Down Outputs | 2 |
| # Step-Up Outputs | 2 |
| # Inverting Outputs | 1 |
| VOUT (V) (min) | -10.5 |
| VOUT (V) (max) | 10.5 |
| Package/Pins | TQFN-CU/32 |
| Budgetary Price (See Notes) | 3.39 |
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)
- 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
Applications/Uses
- Central Information Displays
- Infotainment Displays
- Instrument Clusters
Description
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.
Simplified Block Diagram
Technical Docs
| Data Sheet | Automotive 4-Channel TFT-LCD Power Supplies with VCOM Buffer | Oct 22, 2021 | |
| App Note | Guide to Using the MAX25221 VCOM and Temperature Compensation in TFT-LCD Panels | ||
| solution | TFT-Bias for Automotive Applications |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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