EVALUATION KIT AVAILABLE MAX20090/MAX20090B Automotive High-Voltage, High-Brightness LED Controller General Description Benefits and Features The MAX20090 is a single-channel high-brightness LED High-Brightness LED Driver with a Wide Input Range (HB LED) driver for automotive front-light applications such Saves Space and Cost Through Integration as high beam, low beam, daytime running lights (DRLs), +5V to +65V Wide Input Voltage Range turn indicators, fog lights, and other LED lights. It can take +65V Maximum Boost Output Voltage an input voltage from 5V to 65V and drive a string of LEDs ICTRL Pin for Analog Dimming Integrated High-Side Current-Sense Amplifier with a maximum output voltage of 65V. 200Hz On-Board Ramp Simplifies PWM Dimming The device senses output current at the high side of the LED string. High-side current sensing is required to pro- Flexible Architecture Enables Easy Design tect for shorts from the output to the ground or battery Optimization input. It is also the most flexible scheme for driving LEDs, Configurable as Boost, High-Side Buck, SEPIC, allowing boost, high-side buck, SEPIC mode, or buck- Buck-Boost, Zeta, and uk boost-mode configurations. The PWM input provides LED Programmable Switching Frequency (200kHz to dimming ratios of up to 1000:1, and the ICTRL input provides 2.2MHz) additional analog dimming capability in the controller. The Spread-Spectrum Modulation to Reduce EMI Noise device also includes a fault flag (FLT) that indicates open Automotive Features and Robustness Improve string, shorted string, and thermal shutdown. The device System Reliability has built-in spread-spectrum modulation for improved Fault Diagnosis Through Fault Flag electromagnetic-compatibility performance. The device Short Circuit, Overvoltage, and Thermal Protection can also be used in zeta and uk converter configura- -40C to +125C Operating Temperature Range tions, if necessary in some applications. The MAX20090 is available in a space-saving (4mm x 4mm), 20-pin TQFN, 20-pin side-wettable TQFN, or a 20-pin TSSOP pack- Simplified Typical Operating Circuit age and is specified to operate over the -40C to +125C automotive temperature range L1 INPUT D1 BST Applications C IN BST NDRV CIN Automotive Exterior Lighting N1 ROVP1 COUT RUVEN 1 MAX20090 CS High-Beam/Low-Beam/Signal/Position Lights RSC UVEN OVP Daytime Running Lights (DRLs) R CS LED ISENSE+ PWMDIM Fog Lights and Adaptive Front-Light Assemblies PWMDIM RRT ISENSE- Head-Up Displays RT 100 C2 Commercial, Industrial, and Architectural Lighting DIMOUT P1 V7V FLT RUVEN 2 C1 COMP VCC RCS FET RCOMP ICTRL ROVP2 ANALOG DIM SGND PGND EP C COMP Ordering Information appears at end of data sheet. 19-8747 Rev 8 1/21MAX20090/MAX20090B Automotive High-Voltage, High-Brightness LED Controller Simplified Schematic L1 INPUT D1 C BST BST IN COUT ROVP1 NDRV N1 C IN CS R UVEN1 R SC OVP UVEN R CS LED ISENSE+ PWMDIM PWMDIM ISENSE- R 100 RT RT DIMOUT P1 MAX20090 R UVEN2 C2 FLT V7V R CS FET R C1 OVP2 COMP VCC R1 R COMP ICTRL C R2 COMP SGND PGND EP Maxim Integrated 2 www.maximintegrated.com