MAX16800 19-3803 Rev 1 4/09 High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver General Description Features +6.5V to +40V Operating Range The MAX16800 current regulator operates from a 6.5V to 40V input voltage range and delivers up to a total of Adjustable Level (35mA to 350mA) 350mA to one or more strings of high-brightness LEDs. 3.5% Output Current Accuracy The output current of the MAX16800 is adjusted by Integrated Pass Element with Low-Dropout using an external current-sense resistor in series with Voltage (0.5V typ) the LEDs. An enable input allows wide-range pulsed Output Short-Circuit Protection dimming. Wave-shaping circuitry reduces EMI. The dif- ferential current-sense input increases noise immunity. +5V Regulated Output with 4mA Source Capability The MAX16800 is well suited for applications requiring high-voltage input and is able to withstand automotive Thermal Shutdown load-dump events up to 40V. An on-board pass ele- Differential LED Current Sense ment minimizes external components while providing High-Voltage Enable Pin for Dimming Interface 3.5% output current accuracy. Additional features Low Shutdown Supply Current (12A typ) include a 5V regulated output and short-circuit and thermal protection. Low 204mV Current-Sense Reference Reduces Power Losses The MAX16800 is available in a thermally enhanced, Wave-Shaped Soft Edges Reduce Radiated EMI 5mm x 5mm, 16-pin TQFN package and is specified During PWM Dimming over the automotive -40C to +125C temperature range. Available in Small, Thermally Enhanced, Applications 5mm x 5mm, 16-Pin TQFN Package -40C to +125C Operating Temperature Range Automotive Interior: Map, Courtesy, and Cluster Lighting Ordering Information Automotive Exterior: Tail Lights and CHMSL PART TEMP RANGE PIN-PACKAGE Warning Lights for Emergency Vehicles MAX16800ATE+ -40C to +125C 16 TQFN-EP* Navigation and Marine Indicators MAX16800ATE/V+ -40C to +125C 16 TQFN-EP* General Illumination +Denotes a lead(Pb)-free/RoHS-compliant package. Signage, Gasoline Canopies, Beacons *EP = Exposed paddle. /V denotes an automotive qualified part. Pin Configuration Simplified Diagram TOP VIEW +6.5V TO +40V 12 11 10 9 IN OUT 0.1F +5V REG 8 N.C. V5 N.C. 13 LEDs 0.1F 7 N.C. 14 N.C. MAX16800 MAX16800 CS+ EN 15 6 N.C. R SENSE OUT 16 + 5 N.C. PWM DIMMING EN CS- GND 12 3 4 TQFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. OUT GND IN V5 IN CS- N.C. CS+High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver ABSOLUTE MAXIMUM RATINGS IN, OUT, and EN to GND........................................-0.3V to +45V Continuous Power Dissipation (T = +70C) A CS+, V5 to GND .......................................................-0.3V to +6V 16-Pin TQFN 5mm x 5mm CS- to GND............................................................-0.3V to +0.3V (derate 33.3mW/ C above +70 C)............................2666.7mW OUT Short Circuited to GND Duration Operating Junction Temperature Range...........-40C to +125C (at V = +16V) ........................................................60 minutes Junction Temperature......................................................+150C IN Maximum Current Into Any Pin (except V and OUT) .......20mA Storage Temperature Range .............................-65C to +150C IN Lead Temperature (soldering, 10s) .................................+300C 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 = +12V, EN = V , C = 0.1F to GND, I = 0, CS- = GND, connect R = 0.58 between CS+ and CS-. Connect OUT to IN IN V5 V5 SENSE CS+ (Note 1). T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V (Note 1) 6.5 40.0 V IN Ground Current I I = 350mA 1.4 3 mA G LOAD Shutdown Supply Current I V 0.6V 12 40 A SHDN EN Guaranteed Output Current I R = 0.55 350 mA OUT SENSE Output Current Accuracy 35mA < I < 350mA 3.5 % OUT I = 350mA (current pulsed), OUT 0.5 1.2 V 12V < V < 40V IN Dropout Voltage (Note 3) VDO I = 350mA (current pulsed), OUT 0.5 1.5 V 6.5V < V < 40V IN Current rising 5.4 Output Current Slew Rate mA/s Current falling 90 Short-Circuit Current V = 0V, V = 12V 400 600 800 mA OUT IN LOGIC INPUT EN Input Current I 100 nA EN EN Input Voltage High V 2.8 V IH EN Input Voltage Low V 0.6 V IL TurnOn Time t EN rising edge to 90% of OUT 135 350 s ON CURRENT SENSE (Note 4) Regulated R Voltage V V = V - V 197 204 211 mV SENSE RSNS SENSE CS+ CS- Input Current (CS+) V = 220mV -14 A CS+ Input Current (CS-) V = 220mV +84 A CS+ 2 MAX16800