EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX20056B Integrated, 6-Channel High-Brightness LED Driver with Very Wide PWM Dimming Ratio and Phase Shifting for Automotive Displays General Description Benefits and Features The MAX20056B is a 6-channel LED driver that Robust with Respect to EMC and Automotive Battery integrates a DC-DC switching boost/SEPIC controller and Transients six 120mA current sinks. A current-mode switching DC-DC Wide 4.5V to 42V Input Operating Range Powers controller provides the necessary voltage to the strings of HB LEDs for Medium-to-Large-Sized LCD Displays HB LEDs. in Automotive and Display Backlight Applications Withstands Automotive Load-Dump Events Up to 52V An internal current-mode switching DC-DC controller Integrated Spread Spectrum supports boost, SEPIC, or coupled-inductor buck-boost topologies and operates in a programmable frequency Spread-Spectrum Mode Reduces Emission at the range between 400kHz and 2.2MHz. Current-mode control Switching Frequency and its Harmonics provides fast response and simplifies loop compensation. EMI Reduction Features Include Spread-Spectrum An adaptive output-voltage-adjustment scheme minimizes Modulation (6% of the Switching Frequency Set power dissipation in the LED current sinks. by a Resistor Connected Between RT and SGND) An external resistor sets the channel currents to the Phase-Shift Dimming of LED Strings same value in the range of 20mA to 120mA. The Reduced Input and Output Ripple/Audible Noise device features logic-controlled pulse-width modulation Wide Contrast Ratio Ideal for High-Quality TFT and (PWM) dimming with minimum pulse widths as low as Head-Up Displays 500ns, and either phase-shifted LED strings or standard PWM Dimming Ratio of 10,000:1 at 200Hz dimming control. When phase shifting is enabled, each Robust with Respect to Temperature and Fault string is turned on at a different time, reducing the input Conditions and output ripple as well as audible noise. With phase LED-Open/Short Detection shifting disabled, each current sink is turned on at the Overtemperature Protection same time and allows parallel connection of current sinks Low Shutdown Current (< 15A) through Enable Pin for > 120mA per string. Thermally Enhanced 24-Pin TSSOP Package Applications -40C to +125C AEC-Q100 compliance Automotive Dashboards Automotive Central Information Displays Automotive Head-Up Displays Ordering Information appears at end of data sheet. Automotive Navigation Systems Simplified Schematic L1 D1 VIN C CIN OUT R1 N1 IN NDRV RG ENABLE EN CS RSC PWM DIM DIM RCS R2 FAULT FLT MAX20056B PSEN VCC OVP R3 C1 OUT1 RSDT OUT2 OUT3 R4 OUT4 ISET COMP OUT5 RT R OUT6 COMP R ISET PGND SGND LEDGND C R COMP CX RT 19-100423 Rev 4 9/19MAX20056B Integrated, 6-Channel High-Brightness LED Driver with Very Wide PWM Dimming Ratio and Phase Shifting for Automotive Displays Absolute Maximum Ratings IN, EN, OUT , OVP to SGND ...............................-0.3V to +52V V Short-Circuit Duration ........................................Continuous CC V to SGND ............-0.3V to the lower of (IN + 0.3V) and +6V Continuous Power Dissipation (T = +70C) CC A FLT, DIM, RSDT, PSEN to SGND ...........................-0.3V to +6V TSSOP (derate 30.27mW/C above +70C) ..........2421.3mW CS, NDRV, COMP, ISET, RT to SGND .... -0.3V to (V + 0.3V) Operating Temperature Range ......................... -40C to +125C CC PGND, LEDGND to SGND ..................................-0.3V to +0.3V Junction Temperature ......................................................+150C LEDGND to PGND ...............................................-0.3V to +0.3V Storage Temperature Range ............................ -65C to +150C NDRV Peak Current (< 100ns) .............................................5A Lead Temperature (soldering, 10s) .................................+300C NDRV Continuous Current .............................................100mA Soldering Temperature (reflow) .......................................+260C OUT Continuous Current..............................................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 Thermal Characteristics (Note 1) TSSOP Junction-to-Ambient Thermal Resistance ( ) ...+33.04C/W JA Junction-to-Case Thermal Resistance ( ) ..........+2.34C/W JC Note 1: 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 = V = 12V, R = 20k, T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) IN EN RT A J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY Input Voltage Range V 4.5 42 V IN Input Voltage Range V V = V 4.5 5.5 V IN IN CC V = 5V, V = 1.3V, DIM OVP Quiescent Supply Current I 6 10 mA Q OUT1OUT6 unconnected Standby Supply Current I V = 12V, V = 0V 8 15 A SH IN EN Undervoltage Lockout V rising 3.8 4.15 4.5 V IN Undervoltage Lockout V falling 3.3 4 V IN V REGULATOR CC 5.75V < V < 42V, I = 1mA to IN VCC Output Voltage V 4.8 5 5.2 V CC 10mA, C = 2.2F VCC Dropout Voltage VCC V = 4.5V, I = 10mA 0.1 0.3 V DROP IN VCC V Undervoltage Lockout V rising 4.1 4.2 4.3 V CC CC V Undervoltage Lockout V falling 3.6 3.95 V CC CC Short-Circuit Current Limit IVCC V shorted to SGND 65 mA SC CC Maxim Integrated 2 www.maximintegrated.com