MAX20446CATGA/V+ Analog Devices

Click here to ask about the production status of specific part numbers. MAX20446C Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming General Description Benefits and Features The MAX20446C is a 6-channel backlight driver with Wide Voltage-Range Operation boost controller for automotive displays. The integrated Operates Down to 4V Supply After Startup current outputs can sink up to 130mA LED current each. Survives Load Dump Up to 52V The device accepts a wide 4.5V to 36V input voltage High Integration range and withstands automotive load-dump events. Complete 6-Channel Solution Including Boost The internal current-mode switching DC-DC controller Controller supports boost or SEPIC topologies, and operates in the All Settings Performed with External Components, 400kHz to 2.2MHz frequency range. Integrated spread No Need for Microcontroller Intervention spectrum helps reduce EMI. An adaptive output-voltage- Robust and Low EMI control scheme minimizes power dissipation in the LED Spread-Spectrum Oscillator current-sink paths. Phase Shifting The device features pulse-width modulation (PWM) dim- 400kHz to 2.2MHz Switching-Frequency Range ming and hybrid dimming. In either case, the minimum Versatile Dimming Scheme Allows Hybrid or PWM- pulse width is 500ns. Optional phase-shifted dimming of Only Dimming the strings is incorporated for lower EMI. Dimming Ratio > 10000:1 Using Hybrid Dimming The MAX20446C is exceptionally easy to configure using 10000:1 Dimming Ratio at 200Hz using PWM a single resistor on the SET pin. Dimming The device is available in a 24-pin TQFN package and op- Complete Fault Protection erates over the -40 to +125C temperature range. LED Open/Short Detection and Protection Boost Output Undervoltage and Overvoltage Thermal Shutdown Applications Infotainment Displays Compact (4mm x 4mm) 24-Pin TQFN Package Central Information Displays Ordering Information appears at end of datasheet. Instrument Clusters 19-100916 Rev 0 3/21MAX20446C Automotive 6-Channel Backlight Driver with Boost/ SEPIC Controller and Hybrid Dimming Simplified Block Diagram FLTB BSTMON RSDT 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 MAX20446C POK CS SLOPE COMP COMPENSATION CURRENT IMON 0.425V DIMPHASE CS CS BLANKING 20 MHz 6 CLOCK 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 CONTROL LOGIC 5V SET VCC REGULATOR UVLO VVCC VINUVLO POK REFERENCE CURRENT IREF IN GENERATION EN DUTY-CYCLE COMP DIM TSHDN MEASUREMENT EN SHDN 20MHz POK GND PGND ISET IREF www.maximintegrated.com Maxim Integrated 2