EVALUATION KIT AVAILABLE MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming General Description The MAX16815/MAX16828 current regulators operate from a 6.5V to 40V input voltage range and deliver up to 100mA (MAX16815) or 200mA (MAX16828) to high-brightness LED (HB LED) loads. The output current is adjusted by using an external current-sense resistor in series with the LEDs. The MAX16815/MAX16828's dimming input allows wide-range "pulsed" PWM operation. An on-board pass element minimizes external components while providing 3.5% output-current accuracy. The MAX16815/MAX16828 are available in a thermally enhanced, 3mm x 3mm, 6-pin TDFN package with exposed pad and in an 8-pin SO package with exposed pad; they are specified over the automotive -40C to +125C temperature range. Applications Emergency Vehicle Warning Lights Signage and Indicators Ambient and Architectural Lighting LED Bulbs Display Backlighting Features 6.5V to 40V Operating Range Adjustable LED Current MAX16815: 35mA to 100mA MAX16828: 35mA to 200mA 3.5% LED Current Accuracy High-Voltage DIM Input for Dimming Interface Integrated Pass Element with Low-Dropout Voltage (0.4V typ) 5V Regulated Output with 4mA Source Capability Thermal Shutdown Output Short-Circuit Protection Available in Small, Thermally Enhanced, 3mm x 3mm, 6-Pin TDFN and 8-Pin SO with Exposed Pad Packages -40C to +125C Operating Temperature Range Ordering Information PART Pin Configurations appear at end of data sheet. TEMP RANGE PIN-PACKAGE MAX16815ATT+ -40C to +125C 6 TDFN-EP* MAX16815ASA+ -40C to +125C 8 SO-EP* MAX16828ATT+ -40C to +125C 6 TDFN-EP* MAX16828ASA+ -40C to +125C 8 SO-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Typical Operating Circuit +6.5V TO +40V IN Simplified Diagram 6.5V TO 40V OUT C1 V5 +5V REG LEDs IN C2 EN MAX16815 MAX16828 GND CS- V5 +5V REG LEDs 0.1F CS+ RSENSE DIM 19-4032; Rev 2; 4/14 MAX16815 MAX16828 CS+ PWM DIMMING OUT 0.1F PWM DIMMING RSENSE DIM CSGND MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Absolute Maximum Ratings IN to GND...............................................................-0.3V to +45V CS+, CS-, V5 to GND..............................................-0.3V to +6V DIM, EN to GND..........................................-0.3V to (VIN + 0.3V) OUT Short Circuited to GND Duration (at VIN = +16V)....................................................... 60 minutes Maximum Current into Any Pin (except IN and OUT).......20mA Continuous Power Dissipation (TA = +70C) 6-Pin, 3mm x 3mm TDFN derate 18.2mW/C above +70C)............................1454.5mW 8-Pin SO (derate 23.3mW/C above +70C)...........1860.5mW Operating Temperature Range.......................... -40C to +125C Junction Temperature.......................................................+150C Junction-to-Case Thermal Resistance (JC) (Note 1) 6-Pin, 3mm x 3mm TDFN...............................................9C/W 8-Pin SO.........................................................................7C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) 6-Pin, 3mm x 3mm TDFN.............................................42C/W 8-Pin SO.......................................................................43C/W Storage Temperature Range............................. -60C to +150C Lead Temperature (soldering, 10s).................................. +300C 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.maximintegrated.com/thermal-tutorial. 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 (VIN = 12V, VEN = 12V (SO only), CV5 = 0.1F to GND, IV5 = 0, VDIM = 4V, VCS- = 0V (SO only), connect RSENSE = 2 (MAX16815) and RSENSE = 1 (MAX16828) between CS+ and GND. TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER Supply Voltage Range Ground Current Shutdown Supply Current Guaranteed Output Current SYMBOL VIN IG ISHDN IOUT Output Current Accuracy Dropout Voltage DVDO Output Current Slew Rate Short-Circuit Current CONDITIONS (Note 3) MIN TYP 6.5 MAX UNITS 40.0 V ILOAD = 100mA 0.82 2 ILOAD = 200mA 1 2 35 70 VEN 0.6V (SO only) RSENSE = 2_ (MAX16815) 100 RSENSE = 1_ (MAX16828) 200 mA A mA 35mA < IOUT < 100mA (MAX16815) 3.5 35mA < IOUT < 200mA (MAX16828) 3.5 IOUT = 100mA (current pulsed), 12V < VIN < 40V (MAX16815) (Note 4) 0.1 0.4 IOUT = 100mA (current pulsed), 6.5V < VIN < 12V (MAX16815) (Note 4) 0.1 0.6 IOUT = 200mA (current pulsed), 12V < VIN < 40V (MAX16828) (Note 5) 0.27 0.55 IOUT = 200mA (current pulsed), 6.5V < VIN < 12V (MAX16828) (Note 5) 0.27 0.7 Current rising 9.7 Current falling 9.7 % V mA/s VOUT = 0V, VIN = 12V, MAX16815 130 200 270 VOUT = 0V, VIN = 12V, MAX16828 250 300 350 -1 -0.2 mA EN INPUT (SO ONLY) EN Input Current IEN -2.5 EN Input Voltage High VIH 2.8 EN Input Voltage Low VIL www.maximintegrated.com A V 0.6 V Maxim Integrated 2 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Electrical Characteristics (continued) (VIN = 12V, VEN = 12V (SO only), CV5 = 0.1F to GND, IV5 = 0, VDIM = 4V, VCS- = 0V (SO only), connect RSENSE = 2 (MAX16815) and RSENSE = 1 (MAX16828) between CS+ and GND. TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VRSNS = VCS+ for TDFN package; VRSNS = VCS+ - VCS- for SO package 193 200 207 mV CS- Voltage Range SO only -0.3 Input Current (CS+) VCS+ = 220mV Input Current (CS-) VCS+ = 220mV (SO only) -50 17.2 DIM Input Current VDIM = 0V -2.5 -1.0 CURRENT SENSE Regulated RSENSE Voltage DIM Input-Voltage High VRSNS VIH 2.7 +4.7 V 7 A A -0.2 2.8 A V DIM Input-Voltage Low VIL 0.6 V Turn-On Time tON After VDIM rising to 4V (Note 7) 100 s Turn-Off Time tOFF After VDIM falling to 0.6V (Note 7) 55 s THERMAL OVERLOAD Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis +159 C 24 C +5V REGULATOR Output-Voltage Load Regulation Output Voltage V5 Short-Circuit Current VV5 DVV5 (Note 8) 5.0 5.2 V 0 < IV5 < 4mA 4.8 12 20 mV/mA VV5 = 0 (Note 9) 15 mA Note 2: All devices are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design. Note 3: Resistors were added from OUT to CS+ to aid with power dissipation. Note 4: Dropout is measured as follows: Connect RO from OUT to CS+. Connect RSENSE = 2 (MAX16815) from CS+ to GND (for TDFN) or from CS+ to CS- (for SO). Set VIN = 12V (record VOUT1 = VOUT). For VIN = 40V, use RO = 360; for VIN = 6.5V, use RO = 56. Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). DVDO = VIN2 - VOUT2. Note 5: Dropout is measured as follows: Connect RO from OUT to CS+. Connect RSENSE = 1 (MAX16828) from CS+ to GND (for TDFN) or from CS+ to CS- (for SO). Set VIN = 12V (record VOUT1 = VOUT). For VIN = 40V, use RO = 180; for VIN = 6.5V, use RO = 27. Reduce VIN until VOUT = 0.97 x VOUT1 (record as VIN2 and VOUT2). VDO = VIN2 - VOUT2. Note 6: IV5 = 0mA. Note 7: tON time includes the delay and the rise time needed for IOUT to reach 90% of its final value. tOFF time is the time needed for IOUT to drop below 10%. See the Typical Operating Characteristics. tON and tOFF are tested with 100 (MAX16815) or 51 (MAX16828) from OUT to CS+. Note 8: Current regulation varies with V5 load (see the Typical Operating Characteristics). Note 9: Thermal shutdown does not function if V5 is shorted to ground. www.maximintegrated.com Maxim Integrated 3 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Typical Operating Characteristics (VIN = 12V, TA = +25C, unless otherwise noted.) MAX16815 ILOAD = 100mA MAX16815 AND MAX16828 ILOAD = 35mA 50 -40 -25 -10 5 20 35 50 65 80 95 110 125 5V REGULATOR OUTPUT (V) 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 MAX16815 toc03 5 10 15 20 25 30 35 40 MAX16815 AND MAX16828 5.1 5.0 4.9 4.8 NO LOAD IV5 = 1mA IV5 = 5mA -40 -25 -10 5 20 35 50 65 80 95 110 125 0.4 MAX16815 toc06 5.2 MAX16815 AND MAX16828 0.3 0.2 0.1 0 0 1 2 3 4 TEMPERATURE (C) TEMPERATURE (C) IV5 (mA) +5V REGULATOR OUTPUT vs. VIN MAX16815 200Hz DIMMED OPERATION MAX16815 200Hz DIMMED OPERATION (EXPANDED) MAX16815 AND MAX16828 5.0 4.9 MAX16815 toc08 ILOAD = 100mA, VIN = 12V DIM PULSED AT 200Hz 150% DUTY CYCLE NO LOAD IV5 = 1mA IV5 = 5mA 5 0 35 40 45 50 55 60 65 70 75 80 85 90 95 100 VCS+ (FOR TDFN) OR VCS+ - VCS- (FOR SO) vs. IV5 5.1 4.8 100 50 MAX16815 ILOAD = 100mA 5.2 MAX16815 150 +5V REGULATOR OUTPUT vs. TEMPERATURE 0.2 0 200 DROPOUT VOLTAGE vs. TEMPERATURE 0.3 0.1 MAX16828 250 INPUT VOLTAGE (V) MAX16828 ILOAD = 200mA 0.4 300 OUTPUT CURRENT (mA) MAX16815 toc07 DROPOUT VOLTAGE (V) 0.5 0.1 350 TEMPERATURE (C) MAX16815 toc04 0 0.2 OUTPUT CURRENT vs. INPUT VOLTAGE 400 VCS+ (FOR TDFN) OR VCS+ - VCS- (FOR SO) (V) 100 0.3 MAX16815 toc05 150 MAX16815 AND MAX16828 IOUT UP TO 100mA FOR MAX16828 OUTPUT CURRENT (mA) 200 0.4 VCS+ (FOR TDFN) OR VCS+ - VCS- (FOR SO) vs. OUTPUT CURRENT MAX16815 toc02 MAX16828 ILOAD = 200mA 5V REGULATOR OUTPUT (V) OUTPUT CURRENT (mA) 250 MAX16815 toc01 300 VCS+ (FOR TDFN) OR VCS+ - VCS- (FOR SO) (V) OUTPUT CURRENT vs. TEMPERATURE 10 15 20 25 30 35 40 1ms/div MAX16815 toc09 VDIM 10V/div ILOAD = 100mA, VIN = 12V DIM PULSED AT 200Hz 150% DUTY CYCLE VDIM 10V/div 0V 0V ILOAD 50mA/div ILOAD 50mA/div 0 0 10s/div VIN (V) www.maximintegrated.com Maxim Integrated 4 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Typical Operating Characteristics (continued) (VIN = 12V, TA = +25C, unless otherwise noted.) MAX16815 200Hz DIMMED OPERATION (EXPANDED) MAX16828 200Hz DIMMED OPERATION MAX16815 toc10 ILOAD = 100mA, VIN = 12V DIM PULSED AT 200Hz 50% DUTY CYCLE MAX16815 toc11 VDIM 10V/div ILOAD = 200mA, VIN = 12V DIM PULSED AT 200Hz 50% DUTY CYCLE VDIM 10V/div 0V 0V ILOAD 50mA/div ILOAD 200mA/div 0 0 20s/div 1ms/div MAX16828 200Hz DIMMED OPERATION (EXPANDED) MAX16828 200Hz DIMMED OPERATION (EXPANDED) MAX16815 toc12 ILOAD = 200mA, VIN = 12V DIM PULSED AT 200Hz 50% DUTY CYCLE 20s/div www.maximintegrated.com MAX16815 toc13 VDIM 10V/div ILOAD = 200mA, VIN = 12V DIM PULSED AT 200Hz 50% DUTY CYCLE VDIM 10V/div 0V 0V ILOAD 200mA/div 0 ILOAD 200mA/div 0 20s/div Maxim Integrated 5 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Pin Description TDFN PIN SO NAME FUNCTION 1 6 DIM Pulsed Dimming Input. Drive DIM low to turn off output current (LED current). Drive DIM high to turn on the output current (LED current). DIM is pulled high to VIN when left unconnected -- 7 EN Enable Input. Drive EN high to enable the output. For the TDFN package, this input is not accessible and always high 2 8 OUT 3 1 IN 4 2 CS+ LED Current-Sense Amplifier Positive Input. For the SO package version, connect the current-sense resistor between this pin and CS-; for the TDFN version, connect it between this pin and ground. -- 3 CS- LED Current-Sense Amplifier Negative Input. Connect to ground 5 4 V5 +5V Regulated Output. Connect a 0.1F (min) capacitor from V5 to GND 6 5 GND -- -- EP Current-Regulated Output Positive Input Supply. Bypass IN with a 0.1F (min) capacitor to GND Ground Exposed Pad. Connect to a large ground plane for effective power dissipation. Do not use as the only ground connection. DFN Functional Diagram DIM IN 0.8A V5 BANDGAP AND 5V REGULATOR 1.2V IREG P OUT THERMAL SHUTDOWN CS+ DIFF AMP GND MAX16815 MAX16828 www.maximintegrated.com Maxim Integrated 6 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming SO Functional Diagram DIM IN 0.8A EN V5 BANDGAP AND 5V REGULATOR 1.2V IREG P OUT THERMAL SHUTDOWN CS+ DIFF AMP GND MAX16815 MAX16828 CS- Detailed Description Applications Information +5V Regulator Programming the LED Current The MAX16815/MAX16828 include a fixed +5V output regulator that delivers up to 4mA of load current throughout the 6.5V to 40V input voltage range. Connect a 0.1F compensation capacitor from V5 to ground. Shorting V5 to ground disables the thermal shutdown. V5 stays on during PWM dimming. Thermal Protection The MAX16815/MAX16828 enter a thermal-shutdown mode in the event of overheating. This typically occurs in overload or output short-circuit conditions. If the junction temperature exceeds TJ = +159C (typ), the internal thermal-protection circuitry turns off the series pass device. The MAX16815/MAX16828 recover from thermal-shutdown mode once the junction temperature drops by 24C (typ). The devices therefore protect themselves by thermal cycling in the event of a shortcircuit or overload condition. Shorting V5 to ground disables the thermal shutdown. www.maximintegrated.com The MAX16815/MAX16828 use a sense resistor across CS+ and GND for the TDFN package or across CS+ and CS- for the SO package, to set the LED current. The LED current is given by ILED = VRSNS/RSENSE. Input-Voltage Considerations For proper operation, the minimum input voltage must always be: VIN(MIN) VRSNS(MAX) + VFT(MAX) + VDO(MAX) where VFT(MAX) is the total forward voltage of all series connected LEDs. The minimum operating voltage of the device is +6.5V. The device operates below +6.5V; however, output current may not meet the full regulation specification (see the Typical Operating Characteristics) and the V5 regulator will drop below 5V. Low-Frequency PWM Dimming at the Output Provide a pulse to the dimming input (DIM) of the MAX16815/MAX16828 to produce a PWM output. Alternatively, connect DIM to IN and pulse IN. Maxim Integrated 7 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming D1 STOP D2 TAIL IN OUT R1 MAX16815 MAX16828 R2 D3 IN DIS OUT R3 C1 D4 ICM7555 TH TRG R4* V5 +5V REG LEDs C2 DIM CS+ GND RSENSE GND CS- C2 *R4 < 300k Figure 1. PWM Dimming Operation with ICM7555 Timer Two Brightness Levels for TAIL/STOP Lights Figure 1 shows PWM dimming operation for the MAX16815/MAX16828 with an ICM7555 timer. The ICM7555 provides adjustable duty cycle using two external resistors and a capacitor. In TAIL operation, the output of the ICM7555 feeds into DIM and lights up the LEDs. The LED's brightness depends on the duty cycle of the ICM7555. When VSTOP is present, DIM is pulled up to VSTOP. The PWM dimming operation is disabled and the LEDs light up to full brightness. See the ICM7555 data sheet for formulas to calculate the dimming frequency and the duty cycle. VIN C1 IN OUT MAX16815 MAX16828 PWM DIMMING LEDs V5 C2 DIM CS+ RT R2 GND R1 CS- LED Current Thermal Foldback With a minimum number of external components, the MAX16815/MAX16828 provide LED current thermal foldback using a negative temperature coefficient (NTC) thermistor. Figure 2 shows a thermistor connected to V5 and the CS+ of the MAX16815/MAX16828. As the temperature increases, the voltage drop across R2 increases, causing the LED current to decrease. ILED = [VRSNS - (R2 / RT) (VV5 - VRSNS)]/R1 Other Applications The application circuit in Figure 3 implements a twolevel brightness current for TAIL/STOP lights. In TAIL operation, Q1 is off and R1 sets the output current. In www.maximintegrated.com Figure 2. LED Current Thermal Foldback with an NTC Thermistor STOP operation, Q1 turns on and the output current is set by a parallel combination of R1 and R2. Figure 4 shows an application circuit with the MAX16815/ MAX16828 using a single BJT to provide high output current. For proper operation: VIN(MIN) > VCESAT(MAX) + VFT(MAX) + VRSNS where VCESAT(MAX) is the maximum saturation voltage of the external BJT and VFT(MAX) is the total forward voltage of all series connected LEDs. Maxim Integrated 8 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming STOP LEDs D1 OUT IN TAIL DIM MAX16815 MAX16828 C1 VIN V5 C2 LEDs IN R3 MAX16815 MAX16828 C1 CS+ PWM DIMMING R2 GND Q1 CS+ GND RSENSE Z1 CS- CS- Figure 3. Two-Level Brightness with Current Level Switch for TAIL/STOP Lights Figure 4. Increased LED Current (Ampere Range) with a Single BJT D1 L1 VIN V5 C2 DIM R1 Q1 OUT CREF C2 REF VCC C3 IN R3 MAX5094C CCOMP COMP RCOMP OUT Q1 EN C4 LEDs C7 DIM GND EN V5 C6 FB IN OUT U2 MAX16815 MAX16828 LEDs C11 DIM CT/RT R4 CS GND CS- OUT U3 MAX16815 MAX16828 LEDs V5 C9 C8 DIM CS+ R5 CT EN V5 C10 CS+ IN OUT U4 MAX16815 MAX16828 CS+ R7 GND CS- R6 GND CS- R2 Figure 5. Multichannel HB LED Drivers for LCD Backlight Multichannel HB LED Driver Figure 5 shows an array of MAX16815/MAX16828s with independent DIM control. The MAX5094C, a currentmode PWM controller, provides the input power to each LED driver preregulated voltage to multiple MAX16815/ MAX16828 drivers. www.maximintegrated.com Chip Information PROCESS: BiCMOS Maxim Integrated 9 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Pin Configurations GND V5 CS+ TOP VIEW 6 5 4 MAX16815 MAX16828 8 OUT 2 7 EN CS- 3 6 DIM 5 GND MAX16815 MAX16828 EP* SO 2 3 OUT IN DIM 1 1 V5 4 EP* + IN CS+ TDFN *EP = EXPOSED PAD Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a "+", "#", or "-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 8 SO-EP 6 TDFN-EP www.maximintegrated.com PACKAGE CODE S8E-12 T633-2 DOCUMENT NO. 21-0111 21-0137 Maxim Integrated 10 MAX16815/MAX16828 High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 2/08 Initial release 1 7/09 Added the SO package to the Ordering Information table, Electrical Characteristics, TOC 2 and TOC 6, Pin Description table, and Functional Diagrams; modified the Simplified Diagram and Figures 1-4 to include the CS- pin; and added the SO-EP Pin Configuration 2 4/14 No /V OPNs; removed automotive references from Applications section DESCRIPTION -- 1-4, 6-10 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2014 Maxim Integrated Products, Inc. 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX16815ATT+T MAX16828ATT+T MAX16815ASA+ MAX16815ASA+T MAX16828ASA+ MAX16828ASA+T