MAX20446BATG/V+T Analog Devices

Click here to ask about the production status of specific part numbers. MAX20446B Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller, Hybrid Dimming and 2 I C Interface General Description Benefits and Features The MAX20446B is a 6-channel backlight driver with boost Wide-Voltage-Range Operation controller for automotive displays. The integrated current Operates Down to 4V Supply After Startup outputs can sink up to 130mA LED current each. The de- Survives Load Dump Up to 52V vice accepts a wide 4.5V to 36V input voltage range and High Integration withstands automotive load-dump events. Complete 6-Channel Solution Including Boost The internal current-mode-switching DC-DC controller Controller 2 supports boost or SEPIC topologies, and operates in the I C Control for Minimum Parts Count 400kHz to 2.2MHz frequency range. Integrated spread Robust and Low EMI spectrum helps reduce EMI. An adaptive output-voltage- Spread-Spectrum Oscillator control scheme minimizes power dissipation in the LED Phase Shifting current-sink paths. 400kHz to 2.2MHz Switching-Frequency Range 2 The device features I C-controlled pulse-width-modula- Fail-Safe Operation Mode Using the FSEN Pin tion (PWM) dimming and hybrid dimming. In either case, Versatile Dimming Scheme Allows Hybrid or PWM- the minimum pulse width is 500ns. Optional phase-shifted 2 Only Dimming Using DIM Input or I C dimming of the strings is incorporated for lower EMI. Dimming Ratio > 10000:1 Using Hybrid Dimming Comprehensive diagnostic information is also available Dimming Ratio of 10000:1 at 200Hz Using PWM 2 through the I C interface. Dimming The device is available in a 24-pin TQFN package and op- Complete Diagnostics erates over the -40 to +125C temperature range. LED Open/Short Detection and Protection Boost Output Undervoltage and Overvoltage Applications Boost Voltage Infotainment Displays Individual String LED Current Central Information Displays Thermal Shutdown Instrument Clusters Compact (4mm x 4mm) 24-Pin TQFN Package Ordering Information appears at end of datasheet. 19-100905 Rev 1 1/21MAX20446B Automotive 6-Channel Backlight Driver with Boost/ 2 SEPIC Controller, Hybrid Dimming and I C Interface Simplified Block Diagram FLTB BSTMON OV COMP UV SHORTGND VBG LEDUNUSED FAULT FLAG LOGIC LEDSHORT FAULT LEDSHORT LEDOPEN DETECTOR TSHDN LEDOPEN LEDUNUSED SHORTGND UV COMP UV COMP 0.4V VCC SSDONE 6 g M SSDONE RANGE PWM NDRV EAREF NDRV ARRAY = 6 COMP LOGIC V 6 THH ORPHASE COMPH RTDET 8 CONTROL 6 DAC UP/DOWN OUT LOGIC COUNTER BOOSTON 6 LODIM V THL COMPL RT OSCILLATOR 6 IREF MAX20446B POK CS SLOPE COMP COMPENSATION CURRENT IMON 0.425V DIMPHASE CS CS BLANKING 20 MHz 6 CLOCK FSEN RTDET SHORTGND TSHDN ORPHASE THERMAL LEDSHORT DIM LOGIC & SHUTDOWN LODIM LEDGND LEDOPEN PHASE SHIFTING PRE- BOOSTON LEDUNUSED PGATE REGULATOR BANDGAP VBG OVPUV CONTROL PGATE IN UVLO VIN 200 mA VINUVLO 8 ADC REGISTER MAP & SCL INTERFACE IMON 5V SDA VCC BSTMON MUX REGULATOR 7:1 ISET 3:0 TONH 17:0 UVLO VVCC VINUVLO POK REFERENCE CURRENT IREF IN 0 GENERATION EN DUTY-CYCLE COMP 1 DIM TSHDN MEASUREMENT EN 20MHz DIM EXT SHDN POK GND PGND IREF www.maximintegrated.com Maxim Integrated 2 IMON1 IMON6