EVALUATION KIT AVAILABLE MAX16805/MAX16806 EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback General Description Features 2 EEPROM or I C Dynamically Programmable: The MAX16805/MAX16806 LED drivers eliminate the LED Current Foldback for High Input Voltage need for microcontrollers or switch-mode converters. An LED Current Reference EEPROM-programmable LED current-sense reference sim- LED Current Thermal Foldback (MAX16806) plifies production by using one sense resistor to set the LED current for all LED bins. A dual-mode DIM pin and an on- On-Board 200Hz Ramp Generator Eliminates the board 200Hz ramp generator allow for PWM dimming with an Need for C PWM Signal analog or PWM control signal. The analog control signal at Flexible Analog or PWM Control for PWM or Theater dimming input DIM allows for thetheater dimmin effect to Dimming be implemented. Fast turn-on/-off times ensure a wide-range Wetting Current and Debounce for Momentary Switch PWM operation, while waveshaping circuitry minimizes EMI. (MAX16806) EEPROM-programmable LED current foldback makes it 5.5V to 40V Input with Up to 39V Output Capability possible to operate at a high input voltage, while saving the cost and space associated with having a large heatsink. The 35mA to 350mA Adjustable LED Current MAX16806 works with an external thermal sensor to main- Waveshaping Minimizes EMI During Dimming tain maximum LED junction temperature by folding back the Output Short-Circuit and Overtemperature Protection LED current. The thermal foldback temperature knee and -40C to +125C Operating Temperature Range slope are EEPROM programmable. The MAX16806 SW pin supplies necessary wetting current to a momentary switch. Ordering Information Applications PIN- Emergency Vehicle Warning Lights PART TEMP RANGE PACKAGE Navigation and Marine Indicators MAX16805ATP+ -40C to +125C 20 TQFN-EP* MAX16806ATP+ -40C to +125C 20 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Pin Configurations appear at end of data sheet. Typical Operating Circuits I LED +5.5V TO +40V +5.5V TO +40V I LED IN IN OUT OUT +5V REG 0.1F V5 0.1F +5V REG V5 EN EN V5 LEDs 0.1F 0.1F LEDs V CC MAX16806 SERIAL CLOCK SCL MAX16805 CS+ CS+ SERIAL DATA SDA OUT TFP/SCL MAX6613 RSENSE V5 R SENSE TFN/SDA GND CS- CS- SW DIM PWM DIMMING DIM GND GND PWM CONTROL DIMMING ANALOG CONTROL PWM DIMMING MAX6613 THERMAL SENSOR IS OPTIONAL. 19-0625 Rev 2 9/14MAX16805/MAX16806 EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback Absolute Maximum Ratings IN to GND ..............................................................-0.3V to +45V Maximum Current Into Any Pin (except IN and OUT) ......20mA DIM, OUT, EN to GND ...............................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) IN A IN Slew Rate (20V < V < 45V) .................................250mV/s 20-Pin Thin QFN IN SDA, SCL (MAX16805), TFN/SDA, (derate 34.5mW/C above +70C) .........................2758.6mW TFP/SCL (MAX16806) to GND ............................-0.3V to +6V Operating Temperature Range ......................... -40C to +125C CFD, CS+, V5 to GND ............................................-0.3V to +6V Junction Temperature ......................................................+150C DGND and CS- to GND .......................................-0.3V to +0.3V Storage Temperature Range ............................ -65C to +150C OUT Short Circuited to GND Duration (V < +16V) .......... hour Lead Temperature (soldering, 10s) .................................+300C IN 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 = 12V, C = 0.1F, I = 0, CS- = GND, R = 0.56, V = 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V, IN EN V5 V5 SENSE DIM SW = CFD = Open, T = T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) A J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V (Note 2) 5.5 40 V IN Ground Current I I = 350mA 2.5 4.5 mA G LOAD Shutdown Supply Current I V 0.3V 12 40 A SHDN EN Guaranteed Output Current I R = 0.55 350 mA OUT SENSE 35mA < I < 350mA, R tolerance OUT SENSE Output Current Accuracy 3.0 % not included I = 350mA, 12V < V < 40V 0.4 1.2 OUT IN Dropout Voltage (Note 3) V V DO I = 350mA, 6.5V < V < 12V 0.5 1.5 OUT IN Current rising, DIM rising to 4V 17 Output Current Slew Rate mA/s (External PWM Signal at DIM) Current falling, DIM falling to 0.6V 17 Short-Circuit Current V = 0V 600 mA OUT ENABLE 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 Enable Turn-On Time t EN rising edge to 90% of OUT 225 s ON 5V REGULATOR 0 < I < 0.5mA, V5 4.9 5.1 5.3 SW = GND Output Voltage Regulation V5 6.5V < V < 40V V IN (MAX16806) 0 < I < 2mA, V5 4.9 5.1 5.3 SW = open Output Voltage Regulation V5 0 < I < 2mA, 6.5V < V < 40V 4.9 5.1 5.3 V V5 IN (MAX16805) CURRENT SENSE V = V - V , Binning SENSE CS+ CS- Regulated R Voltage V Adjustment register at factory default 192 198 204 mV SENSE RSNS (0x0F) Input Current (CS+) V = 210mV 12 A CS+ Maxim Integrated 2 www.maximintegrated.com