Click here to ask about the production status of specific part numbers. MAX25220/MAX25221 Automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer General Description Benefits and Features The MAX25220/MAX25221 is a 4-channel TFT-LCD pow- High Integration er IC that provides symmetrical positive AVDD and nega- Synchronous Boost Provides AVDD of 4.2V to tive NAVDD supplies as well as VG and VG gate 10.5V at up to 200mA ON OFF supplies. In addition, a VCOM buffer with output voltage NAVDD Inverter Output at up to -200mA range above and below ground and a temperature mea- 15mA VG Output (7.6V to 20.2V) from 3x ON surement block are integrated (MAX25221). Regulated Charge Pump VG (-18.2V to -5.6V) from Regulated Charge OFF The device contains non-volatile memory so that the val- Pump at up to -15mA (charge-pump doubler) ues of all outputs can be calibrated for the lifetime of the Controlled Sequencing during Power-On and device (maximum five times). Power-Off of All Rails 2 Programming is carried out using the built-in I C interface, VCOM Output Range +1V to -2.49V in 6.83mV which can also be used to read back diagnostic informa- Steps (MAX25221) tion. A stand-alone mode is also available. NTC Input for Temperature Measurement/ The temperature sensor interface block measures the Compensation (MAX25221) temperature optionally allowing the VCOM output voltage Low EMI to be adjusted depending on the measured temperature. 420kHz/2.1MHz Switching Frequency with Spread The MAX25220/MAX25221 is available in a TQFN pack- Spectrum age and operates in the -40 to 125C temperature range. 2 I C Control/Diagnostic Interface with FLTB (Interrupt) Output Applications UV diagnostics on All Outputs Infotainment Displays Versatile Central Information Displays Non-Volatile Output Voltage Settings on AVDD/ Instrument Clusters NAVDD, VG , VG , VCOM, and Sequencing ON OFF Supports Stand-Alone Operation Mode after Programming Compact 5mm x 5mm TQFN32 Package AECQ100 Grade 1 Ordering Information appears at end of datasheet. 19-100803 Rev 1 6/20MAX25220/MAX25221 Automotive 4-Channel TFT-LCD Power Supply with VCOM Buffer Simplified Block Diagram RREF TEMP V18 IN IN DAC REG VCOM 8b ADC FOR TEMP VCOMN BST COMPENSATION NAVDD NEG. VCB REGULATOR TFT BOOST UVLO HVINP CONTROL PGVDD 420kHz/2.1MHz LXP FC2+ FC2- PGND POSITIVE CHARGE PUMP FC1+ 0.9V TEMP WARNING, FC1- SHUTDOWN HVINP VGON REFERENCE POSITIVE AVDD SOFT-START VGOFF AND DISCHARGE ENABLE, CONTROL NEGATIVE NEGATIVE AND FAULT LOGIC CHARGE PUMP SOFT-START DN AND NAVDD DISCHARGE CPGND INVERTING REGULATOR EN PROGRAMMING INN 420kHz/2.1MHz FLTB LOGIC & DGND 2 I C NV MEMORY LXN MAX25221MAX25221 GND ADD SCL SDA VPROG www.maximintegrated.com Maxim Integrated 2