EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX20446 Automotive 6-Channel Backlight Driver with 2 Boost/SEPIC Controller and I C Interface General Description Benefits and Features The MAX20446 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 Survives Load Dump Up to 52V device accepts a wide 4.5V to 36V input voltage range High Integration and withstands direct automotive load-dump events. Complete 6-Channel Solution Including Boost The internal current-mode switching DC-DC controller Controller 2 I C Control for Minimum Parts Count supports boost or SEPIC topologies, and operates in the 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 Fail-Safe Operation Mode Using the FSEN Pin The device features I C-controlled pulse-width modulation (PWM) dimming and hybrid dimming. In either case, the Versatile Dimming Scheme Allows Hybrid or minimum pulse width is 500ns. Phase-shifted dimming of 2 PWM-Only Dimming Using DIM Input or I C the strings is incorporated for lower EMI. Dimming Ratio > 10000:1 Using Hybrid Dimming 10000:1 Dimming Ratio at 200Hz using PWM Dimming Comprehensive diagnostic information is also available 2 through the I C interface. Complete Diagnostics LED Open/Short Detection and Protection The MAX20446 is available in a 24-pin TQFN package Boost Output Undervoltage and Overvoltage and operates in the -40C to +125C temperature range. Boost Voltage Individual String LED Current Applications Thermal Shutdown Infotainment Displays Compact (4mm x 4mm) 24-Pin TQFN Package Central Information Displays Instrument Clusters Ordering Information appears at end of data sheet. 19-100230 Rev 4 5/19MAX20446 Automotive 6-Channel Backlight Driver with 2 Boost/SEPIC Controller and I C Interface Absolute Maximum Ratings IN, EN, OUT , BSTMON, PGATE to GND ...........-0.3V to +52V Continuous Power Dissipation Multilayer Board PGND, LEDGND to GND .....................................-0.3V to +0.3V (T = +70C) ................................................................2.857W A V to GND ............... -0.3V to maximum of (+6V, V + 0.3V)V ESDHB .................................................................. -2kV to +2kV CC IN FLTB, SCL, SDA, DIM to GND................................-0.3V to +6V ESDMM ..............................................................-200V to +200V CS, RT, COMP, NDRV, IREF, Operating Temperature Range ......................... -40C to +125C FSEN to GND ..........................................-0.3V to V + 0.3V Junction Temperature Range ........................... -40C to +150C CC NDRV Peak Current (< 100ns) .................................. -5A to +5A Storage Temperature Range ............................ -65C to +150C NDRV Continuous Current ........................... -100mA to +100mA Lead Temperature (soldering, 10s) .................................+300C OUT Continuous Current............................ -100mA to +150mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information TQFN PACKAGE CODE T2444+4C Outline Number 21-0139 Land Pattern Number 90-0022 Thermal Resistance, Single-Layer Board: Junction to Ambient ( ) 48C/W JA Junction to Case ( ) 3C/W JC Thermal Resistance, Four-Layer Board: Junction to Ambient ( ) 36C/W JA Junction to Case ( ) 3C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (V = 12V, R = 76.8k, C = 1F, T = T = -40C to +125C, unless otherwise noted. Limits are 100% tested at T = +25C. IN RT VCC A J A Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER INPUT Input Operating Range 4.5 36 V Input Voltage Range After 4.2 36 V Startup Input Operating Range IN pin connected to V 4.5 5.5 V CC V = 5V, V = 1.3V, DIM BSTMON Quiescent Supply Current 10 15 mA OUT1OUT6 unconnected Standby Supply Current V = 12V, V = 0V 0.1 1 A IN EN Undervoltage Lockout, Rising 3.8 4.15 4.45 V Maxim Integrated 2 www.maximintegrated.com