EVALUATION KIT AVAILABLE MAX16831 High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control General Description Features The MAX16831 is a current-mode, high-brightness LED Wide Input Range: 6V to 76V With Cold-Start (HBLED) driver designed to control two external Operation to 5.5V n-channel MOSFETs for the single-string LED current Integrated Differential LED Current-Sense regulation. The MAX16831 integrates all the building Amplifier blocks necessary to implement fixed-frequency HBLED Floating Dimming Driver Capable of Driving an drivers with wide-range dimming control. The n-Channel MOSFET MAX16831 is configurable to operate as a step-down (buck), step-up (boost), or step-up/-down (buck-boost) 5% LED Current Accuracy current regulator. 200Hz On-Board Ramp Syncs to External PWM Current-mode control with leading-edge blanking simpli- Dimming Signal fies control-loop design. Internal slope compensation Programmable Switching Frequency (125kHz to stabilizes the current loop when operating at duty cycles 600kHz) and Synchronization above 50%. The MAX16831 operates over a wide input voltage range and is capable of withstanding automo- Output Overvoltage Load Dump, LED Short, tive load-dump events. Multiple MAX16831s can be Overtemperature Protection synchronized to each other or to an external clock. The Low 107mV LED Current Sense for High MAX16831 includes a floating dimming driver for Efficiency brightness control with an external n-channel MOSFET Enable/Shutdown Input with Shutdown Current in series with the LED string. Below 45A HBLED drivers using the MAX16831 achieve efficien- cies of over 90% in automotive applications. The Ordering Information MAX16831 also includes a 1.4A source and 2.5A sink gate driver for driving switching MOSFETs in high-power PART TEMP RANGE PIN-PACKAGE LED driver applications, such as front light assemblies. MAX16831ATJ+ -40C to +125C 32 TQFN-EP* The dimming control allows for wide PWM dimming at MAX16831ATJ/V+ -40C to +125C 32 TQFN-EP* frequencies up to 2kHz. Higher dimming ratios of up to 1000:1 are achievable at lower dimming frequencies. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. The MAX16831 is available in a 32-pin thin QFN package /V denotes an automotive qualified part. with exposed pad and operates over the -40 C to +125C automotive temperature range. Typical Operating Circuits Applications BUCK-BOOST CONFIGURATION Automotive Exterior Lighting: VIN High-Beam/Low-Beam/Signal Lights R CS C CLMP Rear Combination Lights (RCL) RUV2 Daytime Running Lights (DRL) V LO CLMP CS- CS+ DGT R CC UV1 Fog Light and Adaptive Front Light Assemblies UVEN Q RD S DRV C LEDs UVEN SNS+ Industrial and Architectural Lighting R SENSE DIM DIM Emergency Lighting SNS- MAX16831 QGND REG1 C REG1 Projectors with RGB LED Light Sources HI RT C F RTSYNC ROV1 Navigation and Marine Indicators OV COMP CS FB AGND SGND REG2 DRI R OV2 R1 C REG2 C2 R2 C1 Pin Configuration appears at end of data sheet. Typical Operating Circuits continued at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-0809 Rev 2 1/13MAX16831 High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control ABSOLUTE MAXIMUM RATINGS V , HI, LO, CLMP to QGND.................................-0.3V to +80V CS+, CS-, DGT, CLMP to LO ........................-0.3V to (HI + 0.3V) CC CS+, CS-, DGT, UVEN to QGND............................-0.3V to +80V HI to CLMP .............................................................-0.3V to +28V UVEN to QGND ..........................................-0.3V to (V + 0.3V) Continuous Power Dissipation* (T = +70C) CC A DRV to SGND .........................................................-0.3V to +18V 32-Pin TQFN (derate 34.5mW/C above +70C) ........2758mW DRI, REG2, DIM to AGND ......................................-0.3V to +18V Thermal Resistance* QGND, SGND to AGND ........................................-0.3V to +0.3V .................................................................................29C/W JA SNS+ to SNS-...........................................................-0.3V to +6V ................................................................................1.7C/W JC CS, FB, COMP, SNS+, SNS-, OV, REF, Operating Temperature Range .........................-40C to +125C RTSYNC to AGND .................................................-0.3V to +6V Maximum Junction Temperature .....................................+150C REG1, CLKOUT to AGND ........................................-0.3V to +6V Storage Temperature Range .............................-60C to +150C CS+ to CS- .............................................................-0.3V to +12V Reflow Temperature.........................................................+240C HI to LO ..................................................................-0.3V to +36V Lead Temperature (soldering, 10s) .................................+300C CS+, CS-, DGT, CLMP to LO .................................-0.3V to +12V *As per JEDEC 51 standard, multilayer board (PCB). 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. ELECTRICAL CHARACTERISTICS (V = V = 14V, C = 1F, C = 1F, C = 0.1F, R = 25k, T = T = -40C to +125C, unless otherwise noted. CC UVEN REG1 REG2 CLMP T A J Typical specifications are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage Range V 5.5 76.0 V CC Supply Current I I = 0A 2.7 4.5 mA Q REG2 Shutdown Current I V 0.8V 25 45 A SHDN UVEN UVEN V V rising 5.5 6.0 CC R CC V UVLO Threshold V CC V V falling 5.0 5.5 CC F CC V Threshold Hysteresis V 0.4 V CC CC HYS V V rising 1.100 1.244 1.360 UVR UVEN UVEN Threshold V V V falling 1.000 1.145 1.260 UVF UVEN UVEN Input Current I V = 0V and V = 76V, V = 77V -0.2 +0.2 A UVEN UVEN UVEN CC REGULATORS 0 I 2mA, 7.5V V 76V 4.75 5.00 5.25 REG1 CC REG1 Regulator Output V V REG1 I = 2mA, V = 5.7V 4.00 4.50 5.25 REG1 CC REG1 Dropout Voltage I = 2mA (Note 1) 0.5 1.0 V REG1 REG1 Load Regulation V/IV = 7.5V, 0 I 2mA 25 CC REG1 7.5V V 76V, I = 1mA 6.65 7.00 7.35 CC REG2 REG2 Regulator Output V V REG2 V = 5.7V, 0 I 20mA 4.5 5.0 CC REG2 REG2 Dropout Voltage I = 20mA (Note 1) 0.5 V REG2 REG2 Load Regulation V/IV = 7.5V, 0 I 20mA 25 CC REG2 HIGH-SIDE REGULATOR (CLMP) (All Voltages Referred to LO) (Note 2) CLMP UVLO Threshold V V rising 2.0 2.5 3.0 V CLMPTH CLMP CLMP UVLO Threshold V 0.22 V CLMPHYS Hysteresis 2 Maxim Integrated