MAX16839 19-4746 Rev 4 4/11 High-Voltage, Linear High-Brightness LED Driver with Open-LED Fault Detect General Description Features The MAX16839 programmable current regulator operates S 5V to 40V Operating Range from a 5V to 40V input voltage range and features an S Integrated 2I Open-Drain Pass Transistor open-drain, constant-current-sink output capable of sink- S 15mA to 100mA Programmable LED Current ing up to 100mA. The MAX16839 is well suited for auto- S PWM Dimming motive applications and other applications that require a general-purpose linear LED driver. The device directly S Open-LED Fault Detection withstands automotive load-dump events of up to 45V. S Open-LED Fault Event Status Memory An on-board pass element minimizes external compo- S LED Open-Fault Detect Latches Off Multiple LED nent count while providing Q5% output current accuracy. Strings The MAX16839 includes a dimming input that controls S Multichip Synchronized LED Current Sink the duty cycle of the output current, allowing a wide LED S 5% LED Current Accuracy dimming range. In addition, the dimming input functions as an on/off control of the output current. In multiple LED- S -40NC to +125NC Operating Temperature Range string applications, the dimming input synchronizes the S Thermal Protection LED current-sink turn-on, ensuring simultaneous bright- S Undervoltage Lockout ness in LED strings. S 6-Pin TDFN-EP and 8-Pin SO-EP Packages Additional features include thermal and open-LED protection and an open-LED fault-detection output. In Ordering Information multiple LED string applications where all FLTS pins are PART TEMP RANGE PIN-PACKAGE connected together, an open-LED detection in one LED MAX16839ATT+ -40NC to +125NC 6 TDFN-EP* string turns off all the strings simultaneously. Open-LED MAX16839ASA+ -40NC to +125NC 8 SO-EP* protection also features fault memory, to avoid LED flash- MAX16839ATT/V+ -40NC to +125NC 6 TDFN-EP* ing during subsequent power-up cycles. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX16839 is available in thermally enhanced, 6pin *EP = Exposed pad. TDFN-EP and 8-pin SO-EP packages and is specified /V denotes an automotive qualified part. over the -40NC to +125NC automotive temperature range. Typical Application Circuit Applications Automotive Exterior: Turn Signal Light, Brake V BAT Light, Tail and Marker Lights V = 5V TO 40V IN Automotive Interior: Cluster and Warning Lights, Dome and Map Lights Truck, Train, Airplane, and Emergency Car LED REVERSE Lighting PROTECTION DIODE I = 100mA LED General Lighting: Signage, LED Lamps C = 0.01FF IN LEDs IN DIM SINK Pin Configurations appear at end of data sheet. MAX16839 FLTS CS GND C = 0.1FF R = 2I FLTS CS 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. EVALUATION KIT AVAILABLEHigh-Voltage, Linear High-Brightness LED Driver with Open-LED Fault Detect ABSOLUTE MAXIMUM RATINGS (Voltages are specified with respect to GND.) Operating Temperature Range ........................ -40NC to +125NC IN, SINK .................................................................-0.3V to +45V Junction Temperature .....................................................+150NC FLTS ......................................................................-0.3V to +18V Storage Temperature Range ............................ -65NC to +150NC DIM ..........................................................................-0.3V to +6V Lead Temperature (soldering, 10s) ................................+300NC CS .........................................................................-0.3V to +0.5V Soldering Temperature (reflow) ......................................+260NC Continuous Current into SINK and CS .............................120mA Continuous Power Dissipation (T = +70NC) A 6-Pin TDFN (derate 23.8mW/NC above +70NC) .....1904.8mW 8-Pin SO (derate 18.9mW/NC above +70NC) ..........1509.4mW 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) TDFN SO Junction-to-Ambient Thermal Resistance (B ) ..........42NC/W Junction-to-Ambient Thermal Resistance (B ) ..........53NC/W JA JA Junction-to-Case Thermal Resistance (B ) .....................9NC/W Junction-to-Case Thermal Resistance (B ) .................5NC/W JC 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.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V = 12V, V = 0V, R = 4.07I, V = 0V, DIM = unconnected, C = 0.1FF (Note 2), T = T = -40NC to +125NC, unless IN FLTS CS GND IN J A otherwise noted. Typical values are at T = +25NC.) (Note 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V 5 40 V IN Quiescent Current I 0.25 0.6 mA IN Undervoltage Lockout V V rising 3.6 V UVLO IN UVLO Hysteresis 0.3 V CS REGULATOR T = +25NC 195.5 203 210.5 A CS Voltage Accuracy V mV CS -40NC P T P +125NC, 0.9V P V P 5.5V A SINK 193 213 (Note 4) CS Load Regulation 40 20mA P I P 100mA FV/mA SINK Internal Switch On-Resistance R (Note 5) 2 4 I DS ON LED CURRENT TRANSIENT RESPONSE 30% of V rising edge to 50% of I , IN SINK LED Current Turn-On Delay t 4 9 Fs DIN V = 2.1V (Notes 6, 7) DIM LED Current Turn-On Delay t V rising edge to 50% of I 2.3 5.5 Fs DDIN DIM SINK Relative to DIM LED Current Turn-Off Delay V falling edge to 50% of I 1.3 3.5 Fs DIM SINK Relative to DIM LED Current Rise Time t 10% of I to 90% of I 2.5 5.5 Fs r SINK SINK LED Current Fall Time t 90% of I to 10% of I 2.5 6 Fs f SINK SINK 2 MAX16839