Datasheet

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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 (HBLEDs). 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 indepen-

dent 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 detec-

tion, 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

o 5.5V to 40V Operating Range

o Adjustable Constant Output Current

(5mA to 100mA and Up to 2A with External BJT)

o ±5% Output Current Accuracy

o Open LED Detection

o Three Independent High-Voltage DIM Inputs

o Three Integrated Pass Elements with Low

Dropout Voltage (0.7V max)

o Undervoltage Lockout

o Output Short-Circuit Protection

o 3.4V Voltage Regulator with 4mA Capability

o Accurate, Low 203mV Current Sense

o Overtemperature Shutdown

o -40°C to +125°C Operating Temperature Range

MAX16823

High-Voltage, 3-Channel Linear High-Brightness

LED Driver with Open LED Detection

________________________________________________________________

Maxim Integrated Products

CS1 CS2 CS3

OUT3

CS1

CS2

CS3

GND

LEDGOOD

DIM2

DIM1

LEDGOOD

LGC

REG

LGC

DIM3

REG

OUT2

OUT1

MAX16823

Ordering Information

Typical Operating Circuit

19-0733; Rev 3; 9/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX16823ATE+ -40°C to +125°C 16 TQFN-EP*

MAX16823ATE/V+ -40°C to +125°C 16 TQFN-EP*

MAX16823AUE+ -40°C to +125°C 16 TSSOP-EP*

MAX16823AUE/V+ -40°C to +125°C 16 TSSOP-EP*

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

/V Denotes an automotive qualified part.

Summary of content (12 pages)

PAGE 1
9-0733; Rev 3; 9/09 KIT ATION EVALU LE B A IL A AV High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Features 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 (HBLEDs). Each channel’s current is programmable using an external current-sense resistor in series with the LEDs.
PAGE 2
MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection ABSOLUTE MAXIMUM RATINGS 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.
PAGE 3
High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection (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) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 193 203 213 mV +1.
PAGE 4
Typical Operating Characteristics (continued) (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.) 0.7 0.6 0.5 0.4 ILOAD = 70mA 0.3 0.2 VIN = 40V VIN = 20V 1.1 1.0 0.9 0.8 VIN = 12V 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) VREG vs. VIN 330Hz DIMMED OPERATION MAX16823 toc09 MAX16823 toc08 3.44 3.
PAGE 5
High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection 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.
PAGE 6
MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Detailed Description 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 HBLEDs. 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.
PAGE 7
High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection REG UVLO IN IN I_REG IN IN OUT1 BANDGAP CS1 GND DIM1 IN MAX16823 THERMAL SHUTDOWN I_REG OUT2 DIM2 CS2 IN I_REG OUT3 DIM3 CS3 LEDGGOOD LGC LEDGOOD DETECTOR 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 activehigh enable input.
PAGE 8
MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection 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. Outputs Latch-Off Figure 3 shows a circuit with DIM1, DIM2, DIM3, and LEDGOOD connected through a resistor to VREG.
PAGE 9
High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection MAX16823 VIN OUT3 OUT2 IN CIN VREG OUT1 R1 LEDs MAX16823 DIM1 LEDs CS1 DIM2 LEDs RCS1 DIM3 CS2 LEDGOOD RCS2 REG CS3 GND CREG RCS3 Figure 3. Output_ Latch-Off STOP D1 OUT3 OUT2 D2 IN TAIL TAIL STOP/TAIL OUT1 TAIL LEDs MAX16823 DIM1 CS1 LEDs DIM2 R2 DIM3 CIN LEDs R3 RCS1 Q1 R1* CS2 REG CREG RCS2 GND CS3 RCS3 *R1 = 100kΩ Figure 4.
PAGE 10
MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Preload Current Figure 6 shows the MAX16823 with a preload circuit. In the circuit, the BJT, RPRELOAD, and REG generate a preset load current. The preset load current IPRESET is determined with the following formula: VIN Q1 OUT_ IN CIN V − 0.7V IPRESET = REG RPRELOAD REG C2 LEDs MAX16823 PWM DIMMING This circuit is used with older body controllers that monitor minimum RCL current to detect failures.
PAGE 11
High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection CS2 CS3 GND REG TOP VIEW 12 11 10 9 TOP VIEW OUT2 1 8 CS1 13 + 16 OUT3 OUT1 2 LGC 15 CS1 DIM1 3 7 OUT3 14 MAX16823 OUT2 15 OUT1 16 6 *EP + 5 IN DIM2 4 2 3 4 DIM1 DIM2 DIM3 LEDGOOD 13 CS3 DIM3 5 12 GND LEDGOOD 6 11 REG IN IN IN 7 IN 8 1 14 CS2 MAX16823 10 LGC *EP 9 IN TSSOP *EP = EXPOSED PAD.
PAGE 12
MAX16823 High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection Revision History REVISION NUMBER REVISION DATE 0 1/07 Initial release 1 3/07 Released TQFN package. 2 10/08 Updated General Description, Features, EC table, and Detailed Description. 3 9/09 Added automotive packages. DESCRIPTION PAGES CHANGED — 1 1, 2, 6 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.