Click here to ask about the production status of specific part numbers. 2 MAX25530 Automotive I C-Controlled 4-Channel 150mA Backlight Driver and 4-Output TFT-LCD Bias General Description Benefits and Features The MAX25530 is a highly integrated TFT power supply 4-Output TFT-LCD Bias Power and LED backlight driver IC for automotive TFT-LCD ap- 2.8V to 5.5V Input for the TFT-LCD Section plications. The IC integrates one buck-boost converter, Integrated 430kHz or 2.2MHz Boost and Buck- one boost converter, two gate-driver supplies, and a Boost Converters boost/SEPIC converter that can power one to four strings Positive and Negative 10mA Gate Voltage of LEDs in the display backlight. Regulators (Tripler/Inverting Doubler) with Adjustable Output Voltage The source-driver power supplies consist of a synchro- Flexible Resistor-Programmable Sequencing nous boost converter and an inverting buck-boost convert- through the SEQ Pin er that can generate voltages up to +18V and down to Undervoltage Detection on All Outputs -7V. The positive source driver can deliver up to 120mA, Low-Quiescent-Current Standby Mode while the negative source driver is capable of 100mA. The positive source-driver supply-regulation voltage (V ) is 4-Channel LED Backlight Driver POS set by connecting an external resistor-divider on FBP or Up to 150mA Current per Channel 2 through I C. The negative source-driver supply voltage 4.5V to 42V Input Voltage Range (V ) is always tightly regulated to -V (down to a Integrated Boost/SEPIC Controller (440kHz or NEG POS minimum of -7V). The source-driver supplies operate from 2.2MHz) an input voltage between 2.8V and 5.5V. Dimming Ratio 10,000:1 at 200Hz Adaptive Voltage Optimization to Reduce Power The gate-driver power supplies consist of regulated Dissipation in the LED Current Sinks charge pumps that generate from +28V to -21.5V and can Open-String, Shorted-LED, and Short-to-GND deliver 10mA or more each depending on the exact con- Diagnostics figuration. Low EMI The IC features a quad-string LED driver that operates Phase-Shift Dimming of LED Strings from a separate input voltage (V ) and can power up BATT Spread Spectrum on LED Driver and TFT to four strings of LEDs with 150mA (max) of current per Selectable Switching Frequency string. The IC features logic-controlled pulse-width-modu- 2 lation (PWM) dimming, with minimum pulse widths as low I C Interface for Control and Diagnostics as 500ns with the option of phase shifting the LED strings 2 Fault Indication through the FLTB pin and I C with respect to one another. When phase shifting is en- Auto-Retry after Fault Detection abled, each string is turned on at a different time, reducing Overload and Thermal Protection the input and output ripple, as well as audible noise. With -40C to +105C Ambient Temperature Operation phase shifting disabled, the current sinks turn on simulta- 40-Pin (6mm x 6mm) TQFN Package with Exposed neously and parallel connection of current sinks is possi- Pad ble. AECQ100 Grade 1 The startup and shutdown sequences for all power do- mains are controlled using one of the seven preset modes, Ordering Information appears at end of datasheet. which are selectable through a resistor on the SEQ pin or 2 through the I C interface. The MAX25530 is available in a 40-pin (6mm x 6mm) TQFN package with an exposed pad, and operates over the -40C to +105C ambient temperature range. Applications Automotive Dashboards Automotive Central Information Displays Automotive Head Up Displays Automotive Navigation Systems 19-101001 Rev 0 2/212 MAX25530 Automotive I C-Controlled 4-Channel 150mA Backlight Driver and 4-Output TFT-LCD Bias Simplified Block Diagram COMP OVP ISET VCC 1 of 4 UP/DOWN V THH PWM gM COUNTER DRIVE COMP NDRV OUT + LOGIC DAC V THL CURRENT FAULT SLOPE REF. DETECTION COMP 420mV CS 5V BATT REGULATOR TEMP PHASE- + WARNING, SHIFT VCC UVLO + BG SHUTDOWN LOGIC LGND1,2 DIM IN MAX25530 PGVDD BST 400kHz TFT BOOST POSITIVE CONTROL DP CHARGE PUMP 430kHz/2.2MHz LXP TEMP PGND WARNING, FBPG SHUTDOWN FBP 1.25V DGVDD HVINP DGVEE POSITIVE POS 400kHz SOFT-START NEGATIVE AND DN CHARGE PUMP DISCHARGE ENABLE, CONTROL NEGATIVE AND FAULT LOGIC SOFT-START AND NEG FBNG DISCHARGE SEQ DGND INVERTING EN REGULATOR FLTB INN 430kHz/2.2MHz 2 I C REFERENCE LXN REF 1.25V GND EP ADD SCL SDA www.maximintegrated.com Maxim Integrated 2