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MAX16823AUE/V+T

hot MAX16823AUE/V+T

MAX16823AUE/V+T

For Reference Only

Part Number MAX16823AUE/V+T
Manufacturer Maxim Integrated
Description IC LED DRIVER LINEAR DIM 16TSSOP
Datasheet MAX16823AUE/V+T Datasheet
Package 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
In Stock 4940 piece(s)
Unit Price $ 2.2154 *
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MAX16823AUE/V+T

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MAX16823AUE/V+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - LED Drivers
Datasheet MAX16823AUE/V+T Datasheet
Package16-TSSOP (0.173", 4.40mm Width) Exposed Pad
SeriesAutomotive, AEC-Q100
TypeLinear
Internal Switch(s)Yes
Number of Outputs3
Voltage - Supply (Min)5.5V
Voltage - Supply (Max)40V
Voltage - Output39.3V
Current - Output / Channel100mA
DimmingPWM
ApplicationsAutomotive, Backlight, Lighting
Operating Temperature-40°C ~ 125°C (TA)
Mounting TypeSurface Mount
Package / Case16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package16-TSSOP-EP

MAX16823AUE/V+T Datasheet

Page 1

Page 2

General Description The MAX16823 three-channel LED driver operates from a 5.5V to 40V input voltage range and delivers up to 100mA per channel to one or more strings of high- brightness LEDs (HB LEDs). Each channel’s current is programmable using an external current-sense resistor in series with the LEDs. Three DIM inputs allow a wide range of independent pulsed dimming in addition to providing the on and off control of the outputs. Wave- shaping circuitry reduces EMI while providing fast turn-on and turn-off times. The MAX16823 is well suited for automotive applications requiring a high-voltage input and is able to withstand load-dump events up to 45V. On-board pass elements minimize external components while providing ±5% LED current accuracy. Additional features include an active-high, open-drain LEDGOOD output for open LED detection, a +3.4V (±5%) regulated output with 4mA output current capability, short-circuit and thermal protections. The MAX16823 is available in thermally enhanced 5mm x 5mm, 16-pin TQFN-EP and 16-pin TSSOP-EP packages and is specified over the -40°C to +125°C automotive temperature range. Applications ● Automotive Exterior: Rear Combination Lights (RCLs), CHMSL ● Automotive Interior: RGB Ambient Lighting, Cluster Lighting, and LCD Backlighting ● Emergency Vehicle Warning Lights ● Navigation and Marine Indicators ● Architectural and Industrial Lighting Features ● 5.5V to 40V Operating Range ● Adjustable Constant Output Current (5mA to 100mA and Up to 2A with External BJT) ● ±5% Output Current Accuracy ● Open LED Detection ● Three Independent High-Voltage DIM Inputs ● Three Integrated Pass Elements with Low Dropout Voltage (0.7V max) ● Undervoltage Lockout ● Output Short-Circuit Protection ● 3.4V Voltage Regulator with 4mA Capability ● Accurate, Low 203mV Current Sense ● Overtemperature Shutdown ● -40°C to +125°C Operating Temperature Range 19-0733; Rev 5; 6/17 Ordering Information appears at end of data sheet. MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Typical Operating Circuit CS1 CS2 CS3 OUT3 CS1 CS2 CS3 GND LEDGOOD DIM2 DIM1 VIN CIN IN IN IN RLEDGOOD CLGC REG CREG LGC DIM3 REG OUT2 OUT1 MAX16823 EVALUATION KIT AVAILABLE

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IN to GND ..............................................................-0.3V to +45V OUT1, OUT2, OUT3, DIM1, DIM2, DIM3 to GND ..........................................-0.3V to (VIN + 0.3V) REG, LGC, LEDGOOD to GND ..............................-0.3V to +6V CS1, CS2, CS3 to GND .......................................-0.3V to +0.5V OUT1, OUT2, OUT3 Short Circuited to GND Duration (VIN + 16V) ........................................ 60min Maximum Current into Any Pin (except IN, OUT1, OUT2, OUT3) .................................±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN 5mm x 5mm (derate 33.3mW/°C above +70°C) .........................2666mW 16-Pin TSSOP (derate 26.1mW/°C above +70°C) .2088.8mW Operating Temperature Range ......................... -40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range ............................ -65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C (VIN = 12V, CREG = 0.1μF, IREG = 0, CLGC = 15nF, VDIM1 = VDIM2 = VDIM3 = 3.4V, RCS_ = 2.85Ω from CS_ to GND, TJ = TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 2 Absolute Maximum Ratings 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 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range VIN 5.5 40 V Undervoltage Lockout UVLO VIN rising 4.4 4.9 5.4 V VIN falling 4.0 4.6 5.2 Ground Current IG IOUT1 = IOUT2 = IOUT3 = 70mA 1.5 3 mA Guaranteed Output Current IOUT 100 mA LED Current-Sense Accuracy 5mA ≤ IOUT_ ≤ 70mA 5 % Dropout Voltage (Note 2) ∆VDO IOUT_ = 70mA, 6.5V ≤VIN ≤ 40V 0.3 0.7 V IOUT_ = 70mA, 5.5V ≤ VIN ≤ 6.5V 0.3 0.8 Output Current Slew Rate 8 mA/µs Short-Circuit Current VOUT_ = 0V 180 mA LEDGOOD LEDGOOD Output Logic Low VOL ISINK = 2mA 0.4 V LGC Pullup Resistor 65 100 135 kΩ LGC Input Upper Threshold VUTH 2.53 V LGC Input Lower Threshold VLTH 0.8 V LGC Pulldown Current VLGC > VUTH 20 mA LGC Clock Period CLGC = 15nF 0.77 1.5 2.3 ms DIMMING INPUT (DIM1, DIM2, DIM3) DIM_ Logic-Input Bias Current IDIM_ -0.1 +0.1 µA DIM_ Input-Voltage High 2.4 VIN V DIM_ Input-Voltage Low 0.6 V DIM_ Frequency 0 3 kHz

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(VIN = 12V, CREG = 0.1μF, IREG = 0, CLGC = 15nF, VDIM1 = VDIM2 = VDIM3 = 3.4V, RCS_ = 2.85Ω from CS_ to GND, TJ = TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) Note 1: All devices 100% production tested at TJ = +25°C. Limits over the operating temperature range are guaranteed by design. Note 2: Dropout is measured as follows: Connect a resistor from OUT_ to CS_. Connect RCS_ = 2.85Ω from CS_ to GND. Set VIN = VOUT + 3V (record VOUT as VOUTA). Reduce VIN until VOUT = 0.97 x VOUTA (record as VINB and VOUTB). VDO = VINB - VOUTB. Note 3: Output current rise and fall times are measured with a 62Ω series resistor from OUT_ to CS_. Note 4: Overtemperature protection does not function if the output of the 3.4V reference (REG) is shorted to ground. (VIN = 12V, CREG = 0.1μF, IREG = 0, VLGC = unconnected, connect RCS_ = 2.85Ω from CS_ to GND. Connect OUT_ to CS_ through a resistor, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 3 Electrical Characteristics (continued) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS OUTPUTS (OUT1, OUT2, OUT3) (Note 3) Turn-On Time DIM_ rising edge to 90% of OUT_ current 12 28 µs Turn-Off Time DIM_ falling edge to 10% of OUT_ current 8 18 µs Output Current Rise Time 10% to 90% 7 18 µs Output Current Fall Time 90% to 10% 6 15 µs CURRENT SENSE Regulated CS_ Voltage VCS_ 5mA ≤ IOUT_ ≤ 70mA 193 203 213 mV Input Current (CS1, CS2, CS3) Current out of CS_ +1.2 µA OVERTEMPERATURE PROTECTION (Note 4) Thermal Shutdown Temperature 155 °C Thermal Shutdown Hysteresis 23 °C 3.4V REGULATOR (REG) Output Voltage VREG 3.275 3.41 3.547 V 0 ≤ IREG ≤ 4mA 3.221 3.38 3.547 REG Short-Circuit Current VREG = 0V 13 mA Typical Operating Characteristics OUTPUT CURRENT vs. TEMPERATURE TEMPERATURE (°C ) OU TP UT C UR RE NT (m A) M AX 16 82 3 to c0 1 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 10 20 30 40 50 60 70 80 90 100 ILOAD = 5mA ILOAD = 35mA ILOAD = 70mA OUTPUT CURRENT vs. INPUT VOLTAGE INPUT VOLTAGE (V) OU TP UT C UR RE NT (m A) M AX 16 82 3 to c0 3 0 5 10 15 20 25 30 35 40 0 10 20 30 40 50 60 70 80 90 100 IOUT = 70mA IOUT = 5mA VCS_ vs. OUTPUT CURRENT OUTPUT CURRENT (mA) V C S_ (V ) M AX 16 82 3 to c0 2 0 10 20 30 40 50 60 70 0.200 0.201 0.202 0.203 0.204 0.205 0.206 0.207 0.208 0.209 0.210

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(VIN = 12V, CREG = 0.1μF, IREG = 0, VLGC = unconnected, connect RCS_ = 2.85Ω from CS_ to GND. Connect OUT_ to CS_ through a resistor, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Maxim Integrated │ 4www.maximintegrated.com Typical Operating Characteristics (continued) DROPOUT VOLTAGE vs. TEMPERATURE TEMPERATURE (°C) DR OP OU T VO LT AG E (m V) M AX 16 82 3 to c0 4 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 ILOAD = 70mA VCS_ vs. IREG IREG (mA) V C S_ (V ) M AX 16 82 3 to c0 7 0 1 2 3 4 5 6 7 8 9 10 0.195 0.196 0.197 0.198 0.199 0.200 0.201 0.202 0.203 0.204 0.205 0.206 0.207 0.208 0.209 0.210 ILOAD = 70mA 200Hz DIMMED OPERATION (EXPANDED) MAX16823 toc10 10µs/div VDIM 2V/div 0V 0A ILOAD 50mA/div VIN = 12V, DIM PULSED AT 200Hz (50% DUTY CYCLE) ILOAD = 70mA VREG vs. TEMPERATURE TEMPERATURE (°C) V R EG (V ) M AX 16 82 3 to c0 6 -40 -25 -10 5 20 35 50 65 80 95 110 125 3.0 3.1 3.2 3.3 3.4 3.5 ILOAD = 4mA ILOAD = 1mA ILOAD = 0 330Hz DIMMED OPERATION MAX16823 toc09 20µs/div VDIM 2V/div 0V 0A ILED 50mA/div VIN = 12V, DIM PULSED AT 33Hz (1% DUTY CYCLE) ILOAD = 70mA LEDGOOD RESPONSE TIMES MAX16823 toc12 2ms/div VDIM VLEDGOOD 5V/div 5V/div 0V 0V 0V VLGC 5V/div VIN = 12V CLGC = 15nF SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE (°C) SU PP LY C UR RE NT (m A) M AX 16 82 3 to c0 5 -40 -25 -10 5 20 35 50 65 80 95 110 125 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 VIN = 5.5VVIN = 12V VIN = 20V VIN = 40V VDIM1 = VDIM2 = VDIM3 = 0V VREG vs. VIN VIN (V) V R EG (V ) M AX 16 82 3 to c0 8 0 5 10 15 20 25 30 35 40 3.35 3.36 3.37 3.38 3.39 3.40 3.41 3.42 3.43 3.44 3.45 IREG = 0 IREG = 1mA IREG = 4mA 200Hz DIMMED OPERATION (EXPANDED) MAX16823 toc11 10µs/div VDIM 2V/div 0V 0A ILOAD 50mA/div VIN = 12V, DIM PULSED AT 200Hz (50% DUTY CYCLE) ILOAD = 70mA

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MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 5 Pin Description PIN NAME FUNCTION TQFN TSSOP 1 3 DIM1 Dimming Input 1. DIM1 is a low-frequency dimming input for channel 1. A logic-low turns off OUT1 and a logic-high turns on OUT1. 2 4 DIM2 Dimming Input 2. DIM2 is a low-frequency dimming input for channel 2. A logic-low turns off OUT2 and a logic-high turns on OUT2. 3 5 DIM3 Dimming Input 3. DIM3 is a low-frequency dimming input for channel 3. A logic-low turns off OUT3 and a logic-high turns on OUT3. 4 6 LEDGOOD Open LED Output. LEDGOOD is an open-drain output. A logic-high indicates the LED connection is good in all three channels. A logic-low indicates an open LED connection. See the LEDGOOD section. 5, 6, 7 7, 8, 9 IN Positive Input Supply. Bypass with a 0.1µF (min) capacitor to GND. Connect all INpins together. 8 10 LGC LED Detection-Timing Setting. Connect a capacitor from LGC to ground to set the delay time for LEDGOOD. 9 11 REG 3.4V Voltage Regulator. Connect a 0.1µF capacitor from REG to GND. 10 12 GND Ground 11 13 CS3 Channel 3 Sense Amplifier Positive Input. Connect the current-sense resistor between CS3and GND to program the output current level for channel 3. 12 14 CS2 Channel 2 Sense Amplifier Positive Input. Connect the current-sense resistor between CS2and GND to program the output current level for channel 2. 13 15 CS1 Channel 1 Sense Amplifier Positive Input. Connect the current-sense resistor between CS1and GND to program the output current level for channel 1. 14 16 OUT3 Current Regulator Output 3 15 1 OUT2 Current Regulator Output 2 16 2 OUT1 Current Regulator Output 1 — — EP Exposed Pad. Connect EP to a large-area ground plane for effective power dissipation. Do not use as the IC ground connection. Pin Configurations 15 16 14 13 6 5 7 DI M2 LE DG OO D 8 DI M1 CS 3 RE G CS 2 1 2 OUT3 4 12 11 9 OUT2 OUT1 LGC IN IN IN*EP MAX16823 DI M3 GN D 3 10 CS1 TQFN + TOP VIEW 16 15 14 13 12 11 10 1 2 3 4 5 6 7 OUT3 CS1 CS2 CS3DIM2 DIM1 OUT1 OUT2 TOP VIEW *EP = EXPOSED PAD. MAX16823 GND REG LGCIN LEDGOOD 98 ININ DIM3 TSSOP + *EP

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Detailed Description of Hardware The MAX16823 three-channel current regulator operates from a 5.5V to 40V input voltage range and delivers up to 100mA per channel to one or more strings of HB LEDs. The output currents are programmable using external current-sense resistors in series with the LEDs. Three DIM inputs allow a wide range of independent pulsed dimming in addition to providing the on and off control of the outputs. The MAX16823 offers an LED-GOOD output that indicates an open-circuit condition when one or more LED channels are open. Integrated pass elements minimize external components while providing ±5% output current accuracy. Additional features include a 3.4V (±5%) voltage regulator with 4mA output current capability, short-circuit and thermal protection. The MAX16823 uses a feedback loop to linearly control the current from each output. The voltage across each sense resistor is compared to a fixed reference voltage and the error is amplified to drive the internal power pass device for a particular channel. See the Block Diagram. The regulation point is factory-set at 203mV. The regulated current is adjusted by the value of RCS_. The MAX16823 is a constant-current LED driver internally optimized for driving the impedance range expected from one or more HB LEDs. 3.4V Regulator (REG) The MAX16823 includes a fixed 3.4V voltage regulator that delivers up to 4mA of load current for auxiliary appli- cations throughout the 5.5V to 40V input voltage range. Connect a 0.1μF compensation capacitor from REG to ground. Shorting REG to ground disables the thermal shutdown. Thermal Protection The MAX16823 enters a thermal-shutdown mode in the event of overheating. This typically occurs in overload or output short-circuit conditions. When the junction temperature exceeds TJ = +155°C, the internal thermal protection circuitry turns off the series pass elements. The MAX16823 recovers from thermal-shutdown mode once the junction temperature drops by 23°C. The part will therefore protect itself by low-frequency thermal cycling in the event of a short-circuit or overload condition. Applications Information Programming the LED Current The MAX16823 uses sense resistors to set the output current for each channel. To set the LED current for a particular channel, connect a sense resistor across the corresponding current-sense input (CS_) and GND. For optimal accuracy, connect the low-side of the current- sense resistors to the IC’s ground pin with short traces. The value needed for the sense resistor for a given current can be calculated with the equation below: CS_ CS_ OUT_ V (V) R ( ) I (A) Ω = where VCS_ is 203mV and IOUT_ is the desired LED cur- rent (ILED). Input-Voltage Considerations For proper operation, the minimum input voltage must always be: VIN(MIN) ≥ VCS_(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 5.5V. LEDGOOD The MAX16823 features an active-low, open-drain LEDGOOD output that goes low either when one or more LED channels are open or when a signal at any of the dimming inputs remains low for a period greater than the programmed LEDGOOD delay time tDELAY. Program tDELAY with a capacitor connected between LGC and ground. The LEDGOOD output goes low after the programmed delay period tDELAY has elapsed. Use the following formula to set the delay period: tCK = 112,000 x CLGC (F) 4 x tCK < tDELAY < 6 x tCK where CLGC is the capacitor connected between LGC and ground. The LEDGOOD output goes low during the thermal shutdown. The minimum recommended value of the capacitance that can be used on the LGC pin is 100pF. MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 6

Page 8

Pulse-Dimming Inputs (DIM_) The MAX16823 features pulsed or chopped-current dimming inputs (DIM_) to chop the LED current and to adjust the brightness. DIM_ also serves as an active-high enable input. A logic-low at DIM_ turns off OUT_ and a logic-high turns on OUT_. If the signal at DIM stays low more than the programmed LEDGOOD delay time, LEDGOOD goes low (Figure 1). Two Brightness Levels for TAIL/STOP Lights Figure 2 shows the PWM dimming operation for the MAX16823 with an ICM7555 timer. The ICM7555 provides an 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 MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 7 Block Diagram I_REG MAX16823 I_REG I_REG IN IN IN OUT1 CS1 OUT2 OUT3 UVLO THERMAL SHUTDOWN LGC LEDGGOOD DIM3 DIM2 DIM1 GND IN IN IN BANDGAP LEDGOOD DETECTOR CS2 CS3 REG

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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. Outputs Latch-Off Figure 3 shows a circuit with DIM1, DIM2, DIM3, and LEDGOOD connected through a resistor to VREG. This circuit is useful for applications that require all outputs to latch off when one of the LEDs opens. The MAX16823 resumes current regulation again through power cycling, once the fault condition is removed. Other Applications The application circuit in Figure 4 implements a two-level brightness current for TAIL/STOP lights. In TAIL opera- tion, Q1 is off and RCS1 sets the output current. In STOP operation, Q1 turns on and the output current is set by a parallel combination of RCS1 and R2. Figure 5 shows an application circuit with the MAX16823 using a single BJT to provide high output current. For proper operation: VIN(MIN) > VBE(MAX) + VFT(MAX) + VCS_ + VDO(MAX) For minimized dropout, the LEDs can be placed in the collector. Figure 1. LEDGOOD Timing Delay Figure 2. PWM Dimming Operation with ICM7555 MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 8 DIM tON LEDGOOD LEDGOOD GOES LOW WHEN tOFF > tDELAY tOFF IN DIM2 CS1 REG OUT1 GND RCS1 RCS2 RCS3 LEDs 0.1µF TH TRG GND OUT INDIS ICM7555 R3 C2 R2 R1 D1 D4 C1 D2 D3 TAIL STOP DIM1 DIM3 OUT2 OUT3 CS2 CS3 MAX16823 100kΩ

Page 10

Figure 3. Output_ Latch-Off Figure 4. Two-Brightness Level with Current Level Switch for TAIL/STOP Lights MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection www.maximintegrated.com Maxim Integrated │ 9 IN DIM3 DIM2 CS1 OUT1 GND RCS1 RCS2 RCS3 LEDs LEDs LEDs CIN CREG VIN DIM1 VREG LEDGOOD REG OUT2 OUT3 CS2 CS3 MAX16823R1 IN DIM3 DIM2 CS1 OUT1 GND RCS1 RCS2 RCS3 LEDs R2 R3 Q1 LEDs LEDs DIM1 STOP TAIL CIN OUT2 OUT3 CS2 CS3 MAX16823 REG CREG D1 D2 STOP/TAIL TAIL TAIL *R1 = 100kΩ R1*

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hotMAX16823AUE/V+T MAX4382EEE+T Maxim Integrated, IC OPAMP VFB 210MHZ RRO 16QSOP, 16-SSOP (0.154", 3.90mm Width), Automotive, AEC-Q100 View

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