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MAX16809ATU+T

hot MAX16809ATU+T

MAX16809ATU+T

For Reference Only

Part Number MAX16809ATU+T
Manufacturer Maxim Integrated
Description IC LED DRIVER CTRLR DIM 38TQFN
Datasheet MAX16809ATU+T Datasheet
Package 38-WFQFN Exposed Pad
In Stock 380 piece(s)
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MAX16809ATU+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - LED Drivers
Datasheet MAX16809ATU+T Datasheet
Package38-WFQFN Exposed Pad
Series-
TypeDC DC Controller
TopologySEPIC, Step-Down (Buck), Step-Up (Boost)
Internal Switch(s)No
Number of Outputs16
Voltage - Supply (Min)8V
Voltage - Supply (Max)26.5V
Voltage - Output36V
Current - Output / Channel55mA
Frequency20kHz ~ 1MHz
DimmingPWM
ApplicationsBacklight, Lighting
Operating Temperature-40°C ~ 125°C (TA)
Mounting TypeSurface Mount
Package / Case38-WFQFN Exposed Pad
Supplier Device Package38-TQFN (5x7)

MAX16809ATU+T Datasheet

Page 1

Page 2

General Description The MAX16809 is an integrated, high-efficiency white or RGB LED driver. It is designed for LCD backlighting and other LED lighting applications with multiple strings of LEDs. The MAX16809’s current-mode PWM control- ler regulates the necessary voltage to the LED array. Depending on the input voltage and LED voltage range, this device can be used with boost or buck-boost (SEPIC) topologies. The MAX16809 LED driver includes 16 open-drain, constant-current-sinking LED driver outputs rated for 36V continuous operation. The LED current-control cir- cuitry achieves ±3% current matching among strings and enables paralleling of outputs for LED string cur- rents higher than 55mA. The output-enable pin is used for simultaneous PWM dimming of all output channels. Dimming frequency range is 50Hz to 30kHz and dimming ratio is up to 5000:1. The constant-current outputs are single resistor programmable and the LED current can be adjusted up to 55mA per output channel. The MAX16809 operates either in stand-alone mode or with a microcontroller (µC) using an industry-standard, 4-wire serial interface. The MAX16809 includes overtemperature protection, operates over the full -40°C to +125°C temperature range, and is available in a 5mm x 7mm thermally enhanced, 38-pin TQFN exposed pad package. Features ● 16 Constant-Current Output Channels (Up to 55mA Each) ● ±3% Current Matching Among Outputs ● Paralleling Channels Allows Higher Current per LED String ● Outputs Rated for 36V Continuous Voltage ● Output-Enable Pin for PWM Dimming (Up to 30kHz) ● One Resistor Sets LED Current for All Channels ● Wide Dimming Ratio Up to 5000:1 ● Low Current-Sense Reference (300mV) for High Efficiency ● 8V to 26.5V Input Voltage or Higher with External Biasing Devices ● 4-Wire Serial Interface to Control Individual Output Channels Applications ● LCD White or RGB LED Backlighting: LCD TVs, Desktop, and Notebook Panels Industrial and Medical Displays ● Ambient, Mood, and Accent Lighting 19-0656; Rev 3; 4/14 +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. PART TEMP RANGE PIN-PACKAGE MAX16809ATU+ -40°C to +125°C 38 TQFN-EP* OUT0 FB OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 SET LE DIN PGND VCC V+ OE DOUT CLK REF RTCT CREF RSET CIN CBYP RCS CC2 CC1 OUT CS AGND COMP RC1 R2 R1 COUT RT CT 3V TO 5.5V VIN VOUT Q1 L LEDs STAND-ALONE OPERATION MAX16809 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Circuits continued at end of data sheet. Typical Operating Circuits Pin Configuration appears at end of data sheet. Ordering Information EVALUATION KIT AVAILABLE

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VCC to AGND ........................................................-0.3V to +30V Current into VCC (VCC > 24V) ...........................................30mA V+ to PGND ............................................................-0.3V to +6V OUT to AGND ........................................... -0.3V to (VCC + 0.3V) OUT Current (10µs duration) ................................................±1A FB, COMP, CS, RTCT, REF to AGND ....................-0.3V to +6V COMP Sink Current ............................................................10mA OUT0–OUT15 to PGND ........................................-0.3V to +40V DIN, CLK, LE, OE, SET to PGND ...............-0.3V to (V+ + 0.3V) DOUT Current ..................................................................±10mA OUT0–OUT15 Sink Current ...............................................60mA Total PGND Current (1s pulse time) ................................960mA Continuous Power Dissipation (TA = +70°C) 38-Pin TQFN (derate 35.7mW/°C* above +70°C) .....2857mW 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 *Per JEDEC51 Standard (Multilayer Board). (VCC = +15V, V+ = +3V to +5.5V referenced to PGND, RT = 10kΩ, CT = 3.3nF, REF = open, COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. 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 REFERENCE Output Voltage VREF IREF = 1mA, TJ = +25°C 4.95 5 5.05 V Line Regulation ∆VLINE 12V< VCC < 25V, IREF = 1mA 0.4 4 mV Load Regulation ∆VLOAD 1mA < IREF < 20mA 6 50 mV Total Output-Voltage Variation VREFT (Note 2) 4.875 5.125 V Output Noise Voltage VNOISE 10Hz < f < 10kHz 50 µV Output Short-Circuit Current ISHORT VREF = 0V 30 180 mA OSCILLATOR Initial Accuracy TJ = +25°C 51 54 57 kHz Voltage Stability 12V < VCC < 25V 0.2 0.5 % Temperature Stability 1 % RTCT Ramp Peak-to-Peak 1.7 V RTCT Ramp Valley 1.1 V Discharge Current IDIS VRTCT = 2V, TJ = +25°C 7.9 8.3 8.7 mA VRTCT = 2V, -40oC ≤ TJ ≤ +125°C 7.5 8.3 9.0 Frequency Range fOSC 20 1000 kHz ERROR AMPLIFIER FB Input Voltage VFB FB shorted to COMP 2.45 2.5 2.55 V Input Bias Current IB(FB) -0.01 -0.1 µA Open-Loop Gain AVOL 2V ≤ VCOMP ≤ 4V 100 dB Unity-Gain Bandwidth fGBW 1 MHz Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V 60 80 dB COMP Sink Current ISINK VFB = 2.7V, VCOMP = 1.1V 2 6 mA COMP Source Current ISOURCE VFB = 2.3V, VCOMP = 5V 0.5 1.2 1.8 mA COMP Output-Voltage High VOH VFB = 2.3V, RCOMP = 15kΩ to AGND 5 5.8 V COMP Output-Voltage Low VOL VFB = 2.7V, RCOMP = 15kΩ to VREF 0.1 1.1 V www.maximintegrated.com Maxim Integrated │ 2 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Electrical Characteristics (PWM Controller) Stresses beyond those listed under “bsolute 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. Absolute Maximum Ratings

Page 4

(VCC = +15V, V+ = +3V to +5.5V referenced to PGND, RT = 10kΩ, CT = 3.3nF, REF = open, COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. 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 CURRENT-SENSE AMPLIFIER Current-Sense Gain ACS (Notes 3, 4) 2.85 3 3.40 V/V Maximum Current-Sense Signal VCS_MAX (Note 3) 0.275 0.300 0.325 V Power-Supply Rejection Ratio PSRR 12V ≤ VCC ≤ 25V 70 dB Current-Sense Input Bias Current ICS VCOMP = 0V -1 -2.5 µA Current Sense to OUT Delay tPWM 50mV overdrive 60 ns MOSFET DRIVER OUT Low-Side On-Resistance VRDS_ONL ISINK = 200mA TJ = -40°C to +85°C (Note 2) 4.5 10 Ω TJ = -40°C to +125°C 4.5 12 OUT High-Side On-Resistance VRDS_ONH ISOURCE = 100mA TJ = -40°C to +85°C (Note 2) 3.5 7.5 Ω TJ = -40°C to +125°C 3.5 10 Source Current (Peak) ISOURCE CLOAD = 10nF 2 A Sink Current (Peak) ISINK CLOAD = 10nF 1 A Rise Time tR CLOAD = 1nF 15 ns Fall Time tF CLOAD = 1nF 22 ns UNDERVOLTAGE LOCKOUT/STARTUP Startup Voltage Threshold VCC_START 7.98 8.4 8.82 V Minimum Operating Voltage After Turn-On VCC_MIN 7.1 7.6 8.0 V Undervoltage-Lockout Hysteresis UVLOHYST 0.8 V PULSE-WIDTH MODULATION (PWM) Maximum Duty Cycle DMAX 94.5 96 97.5 % Minimum Duty Cycle DMIN 0 % SUPPLY CURRENT Startup Supply Current ISTART VCC = 7.5V 32 65 µA Operating Supply Current ICC VFB = VCS = 0V 3 5 mA VCC Zener Voltage VZ ICC = 25mA 24 26.5 V www.maximintegrated.com Maxim Integrated │ 3 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Electrical Characteristics (PWM Controller) (continued)

Page 5

(V+ = +3V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ 3.0 5.5 V Output Voltage VOUT_ _ 36 V Standby Current (Interface Idle, All Output Ports High Impedance) RSET = 360Ω, DIN, LE, CLK = PGND or V+, OE = V+, DOUT unconnected 3.6 4.5 mA Standby Current (Interface Active, All Output Ports High Impedance) RSET = 360Ω, fCLK = 5MHz, OE = V+, DIN, LE = PGND or V+, DOUT unconnected 3.8 4.8 mA Supply Current (Interface Idle, All Output Ports Active Low) I+ RSET = 360Ω, OE = PGND, DIN,LE = V+, DOUT unconnected 30 52.5 mA INTERFACE (DIN, CLK, DOUT, LE, OE) Input-Voltage High (DIN, CLK, LE, OE) VIH 0.7 x V+ V Input-Voltage Low (DIN, CLK, LE, OE) VIL 0.3 x V+ V Hysteresis Voltage (DIN, CLK, LE, OE) VHYST 0.8 V Input Leakage Current (DIN, CLK) ILEAK -1 +1 µA OE Pullup Current to V+ IOE V+ = 5.5V, OE = PGND 0.25 1.5 25 µA LE Pulldown Current to PGND ILE V+ = 5.5V, LE = V+ 0.25 1.5 25 µA Output-Voltage High (DOUT) VOH ISOURCE = 4mA V+ - 0.5V V Output-Voltage Low (DOUT) VOL ISINK = 4mA 0.5 V OUT_ _ Output Current IOUT_ _ 0°C ≤ TA ≤ +125°C, VOUT = 1V to 2.5V, RSET = 360Ω 43.25 47.5 51.75 mA TA = -40°C, VOUT = 1V to 2.5V, RSET = 360Ω 40 55 OUT_ _ Leakage Current OE = V+ 1 µA www.maximintegrated.com Maxim Integrated │ 4 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Electrical Characteristics (LED Driver)

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(V+ = +4.5V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 5) PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS INTERFACE TIMING CHARACTERISTICS CLK Clock Period tCP 40 ns CLK Pulse-Width High tCH 19 ns CLK Pulse-Width Low tCL 19 ns DIN Setup Time tDS 4 ns DIN Hold Time tDH 8 ns DOUT Propagation Delay tDO 10 50 ns DOUT Rise Time tDR CDOUT = 10pF, 20% to 80% 10 ns DOUT Fall Time tDF CDOUT = 10pF, 80% to 20% 10 ns LE Pulse-Width High tLW 20 ns LE Setup Time tLS 15 ns LE Rising to OUT_ _ Rising Delay tLRR (Note 6) 110 ns LE Rising to OUT_ _ Falling Delay tLRF (Note 6) 340 ns CLK Rising to OUT_ _ Rising Delay tCRR (Note 6) 110 ns CLK Rising to OUT_ _ Falling Delay tCRF (Note 6) 340 ns OE Rising to OUT_ _ Rising Delay tOER (Note 6) 110 ns OE Falling to OUT_ _ Falling Delay tOEF (Note 6) 340 ns OUT_ _ Turn-On Fall Time tF 80% to 20% (Note 6) 210 ns OUT_ _ Turn-Off Rise Time tR 20% to 80% (Note 6) 130 ns www.maximintegrated.com Maxim Integrated │ 5 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller 5V Timing Characteristics

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Note 1: This device is 100% production tested at TJ = +25°C and +125°C. Limits to -40°C are guaranteed by design. Note 2: Guaranteed by design, not production tested. Note 3: Parameter is measured at trip point of latch with VFB = 0V. Note 4: Gain is defined as A = ∆VCOMP/∆VCS, 0.05V ≤ VCS ≤ 0.25V. Note 5: See Figures 3 and 4. Note 6: A 65Ω pullup resistor is connected from OUT_ _ to 5.5V. Rising refers to VOUT_ _ when current through OUT_ _ is turned off and falling refers to VOUT_ _ when current through OUT_ _ is turned on. (V+ = +3V to < +4.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 5) PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS INTERFACE TIMING CHARACTERISTICS CLK Clock Period tCP 52 ns CLK Pulse-Width High tCH 24 ns CLK Pulse-Width Low tCL 24 ns DIN Setup Time tDS 4 ns DIN Hold Time tDH 8 ns DOUT Propagation Delay tDO 12 70 ns DOUT Rise Time tDR CDOUT = 10pF, 20% to 80% 12 ns DOUT Fall Time tDF CDOUT = 10pF, 80% to 20% 12 ns LE Pulse-Width High tLW 20 ns LE Setup Time tLS 15 ns LE Rising to OUT_ _ Rising Delay tLRR (Note 6) 140 ns LE Rising to OUT_ _ Falling Delay tLRF (Note 6) 400 ns CLK Rising to OUT_ _ Rising Delay tCRR (Note 6) 140 ns CLK Rising to OUT_ _ Falling Delay tCRF (Note 6) 400 ns OE Rising to OUT_ _ Rising Delay tOER (Note 6) 140 ns OE Falling to OUT_ _ Falling Delay tOEF (Note 6) 400 ns OUT_ _ Turn-On Fall Time tF 80% to 20% (Note 6) 275 ns OUT_ _ Turn-Off Rise Time tR 20% to 80% (Note 6) 150 ns www.maximintegrated.com Maxim Integrated │ 6 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller 3.3V Timing Characteristics

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(VCC = +15V, V+ = 3V to 5.5V, RT = 10kΩ, CT = 3.3nF, VREF = COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25°C, unless otherwise noted.) 7.88 7.90 8.02 7.94 7.92 7.96 7.98 8.00 8.04 -40 -10 5 20-25 35 50 9580 11065 125 OSCILLATOR RT/CT DISCHARGE CURRENT vs. TEMPERATURE M AX 16 80 9 to c0 8 TEMPERATURE (°C) R T /C T D IS CH AR GE C UR RE NT (m A) VRT/CT = 2V 450 470 460 500 490 480 510 520 540 530 550 -40 -10 5-25 20 35 50 65 80 95 110 125 OSCILLATOR FREQUENCY (fOSC) vs. TEMPERATURE M AX 16 80 9 to c0 7 TEMPERATURE (°C) OS CI LL AT OR F RE QU EN CY (k Hz ) RT = 3.65kΩ CT = 560pF 4.980 4.984 4.982 4.988 4.986 4.992 4.990 4.994 4.998 4.996 5.000 10 14 1612 18 20 22 24 26 REFERENCE VOLTAGE vs. SUPPLY VOLTAGE M AX 16 80 9 to c0 6 VCC (V) V R EF (V ) IREF = 1mA 4.65 4.75 4.70 4.85 4.80 5.00 4.95 4.90 5.05 0 2010 30 40 50 60 70 REFERENCE VOLTAGE vs. REFERENCE LOAD CURRENT M AX 16 80 9 to c0 5 IREF (mA) V R EF (V ) 4.90 4.94 4.92 5.00 4.98 4.96 5.02 5.04 5.06 5.08 REFERENCE VOLTAGE vs. TEMPERATURE M AX 16 80 9 to c0 4 V R EF (V ) -40 -10 5 20-25 35 50 9580 11065 125 TEMPERATURE (°C) IREF = 1mA IREF = 20mA 3.5 3.7 4.9 4.1 3.9 4.3 4.5 4.7 5.1 OPERATING SUPPLY CURRENT vs. TEMPERATURE AFTER STARTUP (fOSC = fSW = 300kHz) M AX 16 80 9 to c0 3 I C C (m A) -40 -10 5 20-25 35 50 9580 11065 125 TEMPERATURE (°C) CT = 560pF 25 27 39 31 29 33 35 37 41 -40 -10 5 20-25 35 50 9580 11065 125 STARTUP CURRENT vs. TEMPERATURE M AX 16 80 9 to c0 2 TEMPERATURE (°C) I C C (µ A) VCC = 7.5V BOOTSTRAP UVLO vs. TEMPERATURE M AX 16 80 9 to c0 1 TEMPERATURE (°C) V C C (V ) 1109565 80-10 5 20 35 50-25 0 1 2 3 4 5 6 7 8 9 10 -40 125 VCC RISING VCC FALLING HYSTERESIS Maxim Integrated │ 7www.maximintegrated.com MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Characteristics

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(VCC = +15V, V+ = 3V to 5.5V, RT = 10kΩ, CT = 3.3nF, VREF = COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS OFF, RSET = 720Ω) M AX 16 80 9 to c1 7 SUPPLY VOLTAGE (V) SU PP LY C UR RE NT (m A) 5.04.54.03.5 1.85 1.90 1.95 2.00 1.80 3.0 5.5 6A = +125°C TA = +85°C TA = +25°C TA = -40°C 2.0 3.0 2.5 4.0 3.5 5.0 4.5 5.5 6.5 6.0 7.0 20 220 320 420120 520 620 720 920820 1020 SUPPLY CURRENT vs. OSCILLATOR FREQUENCY M AX 16 80 9 to c1 6 FREQUENCY (kHz) I C C (m A) TA = +125°C CT = 100pF TA = -40°C 1.5 1.6 2.2 1.8 1.7 1.9 2.0 2.1 2.3 -40 -10 5 20-25 35 50 9580 11065 125 COMP VOLTAGE LEVEL TO TURN OFF DEVICE vs. TEMPERATURE M AX 16 80 9 to c1 5 TEMPERATURE (°C) V C OM P ( V) VCC = 15V ERROR-AMPLIFIER OPEN-LOOP GAIN AND PHASE vs. FREQUENCY MAX16809 toc14 FREQUENCY (Hz) GA IN (d B) 1M100k1k 10k10 1001 0 20 40 60 80 100 120 140 -20 0.01 100M10M -165 -140 -115 -90 -65 -40 -15 10 -190 PHASE GAIN PH AS E (D EG RE ES ) 0 20 10 50 40 30 60 70 90 80 100 PROPAGATION DELAY FROM CURRENT-LIMIT COMPARATOR TO OUT vs. TEMPERATURE M AX 16 80 9 to c1 3 PR OP AG AT IO N DE LA Y (n s) -40 -10 5 20-25 35 50 9580 11065 125 TEMPERATURE (°C) 0 2 1 5 4 3 6 7 9 8 10 OUT IMPEDANCE vs. TEMPERATURE (RDS_ON NMOS DRIVER) M AX 16 80 9 to c1 2 R D S_ ON (Ω ) -40 -10 5 20-25 35 50 9580 11065 125 TEMPERATURE (°C) ISINK = 200mA OUT IMPEDANCE vs. TEMPERATURE (RDS_ON PMOS DRIVER) M AX 16 80 9 to c1 1 TEMPERATURE (°C) R D S_ ON (Ω ) 1109565 80-10 5 20 35 50-25 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 2.0 -40 125 ISOURCE = 100mA TIMING RESISTANCE vs. OSCILLATOR FREQUENCY M AX 16 80 9 to c1 0 FREQUENCY (Hz) R T (k Ω ) 1M100k 1 10 100 1000 0.1 10k 10M CT = 1nF CT = 560pF CT = 220pF CT = 100pF CT = 10nF CT = 4.7nF CT = 3.3nF CT = 2.2nF 0.20 0.24 0.22 0.30 0.28 0.26 0.32 0.34 0.38 0.36 0.40 CURRENT-SENSE TRIP THRESHOLD vs. TEMPERATURE M AX 16 80 9 to c0 9 CS T HR ES HO LD (V ) -40 -10 5 20-25 35 50 9580 11065 125 TEMPERATURE (°C) Maxim Integrated │ 8www.maximintegrated.com MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Characteristics

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(VCC = +15V, V+ = 3V to 5.5V, RT = 10kΩ, CT = 3.3nF, VREF = COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25°C, unless otherwise noted.) OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 720Ω, V+ = 5.0V) M AX 16 80 9 to c2 3 OUT_ _ VOLTAGE (V) OU T_ _ CU RR EN T (m A) 2.52.01.51.00.5 5 10 15 20 25 30 TA = -40°C TA = +25°C TA = +85°C TA = +125°C 0 0 3.0 OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 360Ω, V+ = 3.3V) M AX 16 80 9 to c2 2 OUT_ _ VOLTAGE (V) OU T_ _ CU RR EN T (m A) 2.52.01.51.00.5 10 20 30 40 50 60 TA = -40°C TA = +25°C TA = +85°C TA = +125°C 0 0 3.0 OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 720, V+ = 3.3V) M AX 16 80 9 to c2 1 OUT_ _ VOLTAGE (V) OU T_ _ CU RR EN T (m A) 2.52.01.51.00.5 5 10 15 20 25 30 TA = -40°C TA = +25°C TA = +85°C TA = +125°C 0 0 3.0 SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON, RSET = 360Ω) M AX 16 80 9 to c2 0 SUPPLY VOLTAGE (V) SU PP LY C UR RE NT (m A) 5.04.54.03.5 20 25 30 35 40 TA = +125°C 45 15 3.0 5.5 TA = +85°C TA = -40°C TA = +25°C SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON, RSET = 720Ω) M AX 16 80 9 to c1 9 SUPPLY VOLTAGE (V) SU PP LY C UR RE NT (m A) 5.04.54.03.5 20 25 30 35 40 45 TA = +125°C TA = +85°C TA = -40°C TA = +25°C 15 3.0 5.5 SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS OFF, RSET = 360Ω) M AX 16 80 9 to c1 8 SUPPLY VOLTAGE (V) SU PP LY C UR RE NT (m A) 5.04.54.03.5 3.55 3.60 3.65 3.70 3.50 3.0 5.5 TA = +125°C TA = +85°C TA = -40°C TA = +25°C Maxim Integrated │ 9www.maximintegrated.com MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Characteristics

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(VCC = +15V, V+ = 3V to 5.5V, RT = 10kΩ, CT = 3.3nF, VREF = COMP = open, CREF = 0.1µF, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25°C, unless otherwise noted.) OUT_ _ CURRENT vs. SET RESISTANCE (V+ = 5.0V) M AX 16 80 9 to c2 7 SET RESISTANCE (kΩ) OU T_ _ CU RR EN T (m A) 4321 10 20 30 40 50 0 0 5 OUT_ _ CURRENT vs. V+ (RSET = 360Ω, VOUT = 2V) M AX 16 80 9 to c2 6 SUPPLY VOLTAGE (V) OU T_ _ CU RR EN T (m A) 5.04.54.03.5 47 48 49 TA = -40°C TA = +25°C TA = +85°C TA = +125°C 46 3.0 5.5 OUT_ _ CURRENT vs. V+ (RSET = 720Ω, VOUT = 2V) M AX 16 80 9 to c2 5 SUPPLY VOLTAGE (V) OU T_ _ CU RR EN T (m A) 5.04.54.03.5 23.5 24.0 24.5 25.0 TA = +125°C TA = +85°C TA = +25°C TA = -40°C 23.0 3.0 5.5 OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 360Ω, V+ = 5.0V) M AX 16 80 9 to c2 4 OUT_ _ VOLTAGE (V) OU T_ _ CU RR EN T (m A) 2.52.01.51.00.5 10 20 30 40 50 60 TA = -40°C TA = +25°C TA = +85°C TA = +125°C 0 0 3.0 www.maximintegrated.com Maxim Integrated │ 10 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Characteristics

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Detailed Description The MAX16809 LED driver includes an internal switch- mode controller that can be used as a boost or buck-boost (SEPIC) converter to generate the voltage necessary to drive the multiple strings of LEDs. This device incorpo- rates an integrated low-side driver, a programmable oscil- lator (20kHz to 1MHz), an error amplifier, a low-voltage (300mV) current sense for higher efficiency, and a 5V reference to power up external circuitry (see Figures 1a and 1b). The MAX16809 LED driver includes a 4-wire serial interface and a current-mode PWM controller to gen- erate the necessary voltage for driving 16 open-drain, constant-current-sinking output ports. The driver uses current-sensing feedback circuitry (not simple current mirrors) to ensure very small current variations over the full allowed range of output voltage (see the Typical Operating Characteristics). The 4-wire serial interface comprises a 16-bit shift register and a 16-bit transpar- ent latch. The shift register is written through a clock input, CLK, and a data input, DIN, and the data propa- gates to a data output, DOUT. The data output allows multiple drivers to be cascaded and operated together. The contents of the 16-bit shift register are loaded into the transparent latch through a latch-enable input, LE. The latch is transparent to the shift register outputs when high and latches the current state on the falling edge of LE. Each driveoutput is an open-drain, con - stant-current sink that should be connected to the PIN NAME FUNCTION 1, 31, 32, 36, 38 N.C. No Connection. Not internally connected. Leave unconnected. 2 FB Error-Amplifier Inverting Input 3 COMP Error-Amplifier Output 4–11 OUT8–OUT15 LED Driver Outputs. OUT8–OUT15 are open-drain, constant-current-sinking outputs rated for 36V. 12 OE Active-Low, Output Enable Input. Drive OE low to PGND to enable the OUT0–OUT15. Drive OE high to disable OUT0–OUT15. 13 DOUT Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK’s rising edge. 14 SET LED Current Setting. Connect RSET from SET to PGND to set the LED current. 15 V+ LED Driver Positive Supply Voltage. Bypass V+ to PGND with a 0.1µF ceramic capacitor. 16, 17 PGND Power Ground 18 DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge. 19 CLK Serial-Clock Input 20 LE Latch-Enable Input. Data is loaded transparently from the internal shift register(s) to the output latch(es) while LE is high. Data is latched into the output latch(es) on LE’s falling edge, and retained while LE is low. 21–28 OUT0–OUT7 LED Driver Outputs. OUT0–OUT7 are open-drain, constant-current-sinking outputs rated for 36V. 29 RTCT PWM Controller Timing Resistor/Capacitor Connection. A resistor RT from RTCT to REF and a capacitor CT from RTCT to AGND set the oscillator frequency. 30 CS PWM Controller Current-Sense Input 33 AGND Analog Ground 34 OUT MOSFET Driver Output OUT. Connects to the gate of the external n-channel MOSFET. 35 VCC Power-Supply Input. Bypass VCC to AGND with a 0.1µF ceramic capacitor or a parallel combination of a 0.1µF and a higher value ceramic capacitor. 37 REF 5V Reference Output. Bypass REF to AGND with a 0.1µF ceramic capacitor. — EP Exposed Paddle. Connect to the ground plane for improved power dissipation. Do not use as the only ground connection. www.maximintegrated.com Maxim Integrated │ 11 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Pin Description

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cathode of a string of LEDs connected in series. The constant-current capability is up to 55mA per output, set for all 16 outputs by an external resistor, RSET. The device can operate in a stand-alone mode (see the Typical Operating Circuits). The number of channels can be expanded by using the MAX6970 and MAX6971 family in conjunction with the MAX16809. Figure 1a. Internal Block Diagram 2R R 26.5V EN_REF BG SNS 300mV UVLO ILIM VEA CPWM VOLTAGE- DIVIDER VDD THERMAL SHUTDOWN VOLTAGE DIVIDER OSC CLK PREREG 5V REG_OK 5V REG REFERENCE 2.5V DELAY S R Q Q VCC V+ CURRENT REFERENCE POWER-ON RESET THERMAL SHUTDOWN AGND CS VCC REF OUT RTCT DOUT V+ SET FB COMP CLK DIN LE OE D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 OU T0 OU T1 OU T2 OU T3 OU T4 OU T5 OU T6 OU T7 D8 D9 D10 D11 D12 D13 D14 D15 D8 D9 D10 D11 D12 D13 D14 D15 D8 D9 D10 D11 D12 D13 D14 D15 OU T8 OU T9 OU T1 0 OU T1 1 OU T1 2 OU T1 3 OU T1 4 OU T1 5 PGND MAX16809 SERIAL-TO-PARALLEL SHIFT REGISTER OUTPUT LATCHES CONSTANT-CURRENT SINK www.maximintegrated.com Maxim Integrated │ 12 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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Switch-Mode Controller Current-Mode Control Loop The advantages of current-mode control over volt- age-mode control are twofold. First, there is the feed-for- ward characteristic brought on by the controller's ability to adjust for variations in the input voltage on a cycle-by- cycle basis. Second, the stability requirements of the cur- rent-mode controller are reduced to that of a single-pole system unlike the double pole in the voltage-mode control scheme. The MAX16809 uses a current-mode control loop where the output of the error amplifier is compared to the current-sense voltage (VCS). When the current-sense signal is lower than the inverting input of the CPWM com- parator, the output of the comparator is low and the switch is turned on at each clock pulse. When the current-sense signal is higher than the inverting input of the CPWM comparator, the output is high and the switch is turned off. Undervoltage Lockout (UVLO) The turn-on supply voltage for the MAX16809 is 8.4V (typ). Once VCC reaches 8.4V, the reference powers up. There is a 0.8V of hysteresis from the turn-on voltage to the UVLO threshold. Once VCC reaches 8.4V, the MAX16809 operates with VCC down to 7.6V. Once VCC goes below 7.6V (typ), the device is in UVLO. When in UVLO, the quiescent supply current into VCC falls back to 32µA (typ), and OUT and REF are pulled low. MOSFET Driver OUT drives an external n-channel MOSFET and swings from AGND to VCC. Ensure that VCC remains below the absolute maximum VGS rating of the external MOSFET. OUT is a push-pull output with the on-resistance of the pMOS typically 3.5Ω and the on-resistance of the nMOS typically 4.5Ω. The driver can source 2A and sink 1A typi- cally. This allows for the MAX16809 to quickly turn on and off high gate-charge MOSFETs. Bypass VCC with one or more 0.1µF ceramic capacitors to AGND, placed close to VCC. The average current sourced to drive the external MOSFET depends on the total gate charge (QG) and operating frequency of the converter. The power dissipa- tion in the MAX16809 is a function of the average output drive current (IDRIVE). Use the following equation to cal- culate the power dissipation in the device due to IDRIVE: IDRIVE = (QG x fSW) PD = (IDRIVE + ICC) x VCC where ICC is the operating supply current. See the Typical Operating Characteristics for the operating supply current at a given frequency. Error Amplifier The MAX16809 includes an internal error amplifier. The inverting input is at FB and the noninverting input is internally connected to a 2.5V reference. Set the output voltage using a resistive divider between output of the converter VOUT, FB, and AGND. Use the following for- mula to set the output voltage: OUT FB R1V 1 x V R2  = +    where VFB = 2.5V. Oscillator The oscillator frequency is programmable using an exter- nal capacitor and a resistor at RTCT (see RT and CT in the Typical Operating Circuits). RT is connected from RTCT to the 5V reference (REF), and CT is connected from RTCT to AGND. REF charges CT through RT until its voltage reaches 2.8V. CT then discharges through an 8.3mA internal current sink until CT's voltage reaches 1.1V, at which time CT is allowed to charge through RT again. The oscillator's period is the sum of the charge and discharge times of CT. Calculate the charge time as follows: tC = 0.57 x RT x CT where tC is in seconds, RT in ohms (Ω), and CT in Farads (F). The discharge time is then: tD = (RT x CT x 1000) / [(4.88 x RT) - (1.8 x 1000)] where tD is in seconds, RT in ohms (Ω), and CT in Farads (F). Figure 1b. OUT_ _ Driver Internal Diagram V+ W/L OUT_ _68W/L 945R REST 1.23 R 1.23V PGNDSET MAX16809 www.maximintegrated.com Maxim Integrated │ 13 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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The oscillator frequency is then: ( )OSC C D 1f t t = + Reference Output REF is a 5V reference output that can source 20mA. Bypass REF to AGND with a 0.1µF capacitor. Current Limit The MAX16809 includes a fast current-limit comparator to terminate the ON cycle during an overload or a fault condition. The current-sense resistor, RCS, connected between the source of the external MOSFET and AGND, sets the current limit. The CS input has a volt- age trip level (VCS) of 0.3V. Use the following equation to calculate RCS: CS CS P P VR I − = IP-P is the peak current that flows through the MOSFET. When the voltage produced by this current (through the current-sense resistor) exceeds the current-limit com- parator threshold, the MOSFET driver (OUT) turns the switch off within 60ns. In most cases, a small RC filter is required to filter out the leading-edge spike on the sense waveform. Set the time constant of the RC filter at 50ns. Buck-Boost (SEPIC) Operation Figure 2 shows a buck-boost application circuit using the MAX16809 in a stand-alone mode of operation. SEPIC topology is necessary when the total forward voltage of the LEDs in a string is such that VOUT can be below or above VIN. Figure 2. Buck-Boost (SEPIC) Operation MAX16809 OUT0 FB OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15 EXTERNAL DIM INPUT EXTERNAL CLOCK INPUT SET LE DIN PGND VCC V+ OE DOUT CLK REF RTCT CREF CIN RSET RCS C1 CC2 CC1 OUT CS AGND COMP RC1 R2 R1 COUT CBYP RT CT 3V TO 5.5V VIN VOUT Q1 DL1 L2 www.maximintegrated.com Maxim Integrated │ 14 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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LED Driver 4-Wire Interface The MAX16809 also operates in a stand-alone mode (see the Typical Operating Circuits). For use with a microcon- troller, the MAX16809 features a 4-wire serial interface using DIN, CLK, LE, OE inputs and DOUT as a data output. This interface is used to write the LED channels? data to the MAX16809. The serial-interface data word length is 16 bits, D0?D15. See Figure 3. The functions of the five interface pins are as follows: DIN is the serial-data input, and must be stable when it is sampled on the rising edge of CLK. Data is shifted in MSB first. This means that data bit D15 is clocked in first, followed by 15 more data bits, finishing with the LSB, D0. CLK is the serial-clock input that shifts data at DIN into the MAX16809's 16-bit shift register on its rising edge. LE is the latch-enable input of the MAX16809 that trans- fers data from the 16-bit shift register to its 16-bit output latches (transparent latch). The data latches on the falling edge of LE (Figure 4). The fourth input (OE) pro- vides output-enable control of the output drivers. When OE is driven high, the outputs (OUT0–OUT15) are forced to high impedance without altering the contents of the output latches. Driving OE low enables the outputs to fol- low the state of the output latches. OE is independent of the serial interface operation. Data can be shifted into the serial-interface shift register and latched, regardless of the state of OE. DOUT is the serial-data output that shifts data out from the MAX16809's 16-bit shift regis- ter on the rising edge of CLK. Data at DIN propagates through the shift register and appears at DOUT 16 clock cycles later. Table 1 shows the 4-wire serial-interface truth table. L = Low Logic Level H = High Logic Level X = Don't Care P = Present State (Shift Register) R = Previous State (Latched) Table 1. 4-Wire Serial-Interface Truth Table SERIAL DATA INPUT DIN CLOCK INPUT SHIFT REGISTER CONTENTS LOAD INPUT LATCH CONTENTS BLANKING INPUT OUTPUT CONTENTS CURRENT AT OUT_ _ CLK D0 D1 D2 … Dn-1 Dn LE D0 D1 D2 … Dn-1 Dn OE D0 D1 D2 … Dn-1 Dn H H R0 R1 … Rn-2 Rn-1 L L R0 R1 … Rn-2 Rn-1 X R0 R1 R2 … Rn-1 Rn X X X … X X L R0 R1 R2 … Rn-1 Rn P0 P1 P2 … Pn-1 Pn H P0 P1 P2 … Pn-1 Pn L P0 P1 P2 … Pn-1 Pn X X X … X X H L L L … L L www.maximintegrated.com Maxim Integrated │ 15 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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Selecting External Component RSET to Set LED Output Current The MAX16809 uses an external resistor, RSET, to set the LED current for outputs OUT0–OUT15. The minimum allowed value of RSET is 311Ω, which sets the output currents to 55mA. The maximum allowed value of RSET is 5kΩ (IOUT_ _ = 3.6mA) and the maximum allowed capac- itance at SET is 100pF. Use the following formula to set the output current: SET OUT_ _ 17,100VR I = where IOUT_ _ is the desired output current in milliamps and the value for RSET is in ohms. Overtemperature Cutoff The MAX16809 contains an internal temperature sen- sor that turns off all outputs when the die temperature exceeds +165°C. The outputs are enabled again when the die temperature drops below +140°C. Register con- tents are not affected, so when a driver is overdissipating, the external symptom is the load LEDs cycling on and off as the driver repeatedly overheats and cools, alternately turning itself off and then back on again. Figure 4. LE and CLK to OUT_ _ Timing Figure 3. 4-Wire Serial-Interface Timing Diagram LE OUT_ _ LE OUT_ _ CLK OUT_ _ CLK OUT_ _ tCRR tCRF tLRR tLRF D15 D14 tDS tDH tCL tCP tDO tOEW tOEF tF tR tOER tLS tLW tCH D1 D0 D15 LE CLK DIN DOUT OE OUT_ _ 80% 20% www.maximintegrated.com Maxim Integrated │ 16 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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Stand-Alone Operation In stand-alone operation, the MAX16809 does not use the 4-wire interface (see the Typical Operating Circuits). Connect DIN and LE to V+ and provide at least 16 external clock pulses to CLK to enable 16 output ports. This startup pulse sequence can be provided either using an external clock or the PWM signal. The external clock can also be generated using the signal at RTCT and an external comparator. LED Dimming PWM Dimming All the output channels can be dimmed simultaneously by applying a PWM signal (50Hz to 30kHz) to OE. This allows for a wide range of dimming up to a 5000:1 ratio. Each channel can be independently turned on and off using a 4-wire serial interface. The dimming is proportion- al to the PWM duty cycle. LED Current Amplitude Adjustment Using an analog or digital potentiometer as RSET allows for LED current amplitude adjustment and linear dimming. Computing Power Dissipation Use the following equation to estimate the upper limit power dissipation (PD) for the MAX19: i 15 OUTi OUTi i 0 CC CC PD DUTY (V x I ) V x I (V x I ) = =   = × + + + ∑    + where: V+ = supply voltage I+ = V+ operating supply current DUTY = PWM duty cycle applied to OE VOUTi = MAX16809 port output voltage when driving load LED(s) IOUTi = LED drive current programmed by RSET PD = power dissipation PCB Layout Guidelines Careful PCB layout is critical to achieve low switching losses and clean, stable operation. Use a multilayer board whenever possible for better noise immunity. Protect sensitive analog grounds by using a star ground con- figuration. Minimize ground noise by connecting AGND, PGND, the input bypass-capacitor ground lead, and the output-filter ground lead to a single point (star ground con- figuration). Also, minimize trace lengths to reduce stray capacitance, trace resistance, and radiated noise. The trace between the output voltage-divider and the FB pin must be kept short, as well as the trace between AGND and PGND. www.maximintegrated.com Maxim Integrated │ 17 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

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MAX16809 FB PGND VCC V+ OE LE DOUT DIN CLKSCLK MOSI MISOµC LOAD ENABLE RCS CC2 CC1 OUT CS AGND COMP LEDs OPERATION WITH MICROCONTROLLER RC1 R2 R1 COUT 3V TO 5.5V VIN VOUT L OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15SET REF RTCT CREF RSET RT CT CIN CBYP D www.maximintegrated.com Maxim Integrated │ 18 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller Typical Operating Circuits (continued)

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PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 38 TQFN-EP T3857M+1 21-0172 90-0007 TOP VIEW MAX16809 TQFN + 13 14 15 16 17 18 19 DOUT SET V+ PGND PGND DIN CLK 38 37 36 35 34 33 32 1 2 3 4 5 6 7 8 9 10 11 12 N.C. REF N.C. VCC OUT AGND N.C. OE OU T1 5 OU T1 4 OU T1 3 OU T1 2 OU T1 1 OU T1 0 OU T9 OU T8 CO MPFBN. C. 31 30 29 28 27 26 25 24 23 22 21 20 LEOU T0 OU T1 OU T2 OU T3 OU T4 OU T5 OU T6 OU T7 RT CT CSN. C. www.maximintegrated.com Maxim Integrated │ 19 MAX16809 Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller 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. Chip Information PROCESS: BiCMOS Pin Configuration

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