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19-0656; Rev 0; 10/06
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
General Description
The MAX16809/MAX16810 are integrated, high-efficiency white or RGB LED drivers. They are designed for LCD backlighting and other LED lighting applications with multiple strings of LEDs. The MAX16809/ MAX16810's current-mode PWM controller regulates the necessary voltage to the LED array. Depending on the input voltage and LED voltage range, it can be used with boost or buck-boost (SEPIC) topologies. The MAX16809/MAX16810 LED drivers include 16 open-drain, constant-current-sinking LED driver outputs rated for 36V continuous operation. The LED currentcontrol circuitry achieves 3% current matching among strings and enables paralleling of outputs for LED string currents 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/MAX16810 operate either in stand-alone mode or with a microcontroller (C) using an industrystandard, 4-wire serial interface. The MAX16810 includes a watchdog and circuitry that automatically detects open-circuit LEDs. The MAX16809/MAX16810 include overtemperature protection, operate over the full -40C to +125C temperature range, and are available in a 5mm x 7mm thermally enhanced, 38-pin TQFN exposed paddle package.
Pin Configuration appears at end of data sheet.
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 Open LED Detection and Watchdog Timer (MAX16810) 4-Wire Serial Interface to Control Individual Output Channels
MAX16809/MAX16810
Applications
LCD White or RGB LED Backlighting: LCD TVs, Desktop, and Notebook Panels Automotive Navigation, Heads-Up, and Infotainment Displays Industrial and Medical Displays Ambient, Mood, and Accent Lighting
Ordering Information
PART MAX16809ATU+ TEMP RANGE PINPACKAGE PKG CODE
-40C to +125C 38 TQFN-EP** T3857-1
MAX16810ATU+* -40C to +125C 38 TQFN-EP** T3857-1
+Denotes lead-free package. *Future product--contact factory for availability. **EP = Exposed paddle.
Typical Operating Circuits
VIN L COUT Q1 R1 LEDs VOUT
RCS CC1
CC2
RC1
R2
OUT CS AGND VCC
3V TO 5.5V
COMP FB
CIN V+ CBYP PGND LE DIN CLK DOUT OE SET OUT0 OUT1 OUT2 OUT3
MAX16809 MAX16810
OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14
RSET REF RT CREF RTCT
OUT15 STAND-ALONE OPERATION
CT
Typical Operating Circuits continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
ABSOLUTE MAXIMUM RATINGS
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 (10s 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 = +70C) 38-Pin TQFN (derate 35.7mW/C* above +70C) ......2857mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C *Per JEDEC51 Standard (Multilayer Board).
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 (PWM CONTROLLER)
(VCC = +15V, V+ = +3V to +5.5V referenced to PGND, RT = 10k, CT = 3.3nF, REF = open, COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. TJ = TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Total Output-Voltage Variation Output Noise Voltage Output Short-Circuit Current OSCILLATOR Initial Accuracy Voltage Stability Temperature Stability RTCT Ramp Peak-to-Peak RTCT Ramp Valley Discharge Current Frequency Range ERROR AMPLIFIER FB Input Voltage Input Bias Current Open-Loop Gain Unity-Gain Bandwidth Power-Supply Rejection Ratio COMP Sink Current COMP Source Current COMP Output-Voltage High COMP Output-Voltage Low VFB IB(FB) AVOL fGBW PSRR ISINK ISOURCE VOH VOL 12V VCC 25V VFB = 2.7V, VCOMP = 1.1V VFB = 2.3V, VCOMP = 5V VFB = 2.3V, RCOMP = 15k to AGND VFB = 2.7V, RCOMP = 15k to VREF 60 2 0.5 5 2V VCOMP 4V FB shorted to COMP 2.45 2.5 -0.01 100 1 80 6 1.2 5.8 0.1 1.1 1.8 2.55 -0.1 V A dB MHz dB mA mA V V IDIS fOSC VRTCT = 2V, TJ = +25C VRTCT = 2V, -40oC TJ +125C 7.9 7.5 20 TJ = +25C 12V < VCC < 25V 51 54 0.2 1 1.7 1.1 8.3 8.3 8.7 9.0 1000 57 0.5 kHz % % V V mA kHz VREF VLINE VLOAD VREFT VNOISE ISHORT IREF = 1mA, TJ = +25C 12V< VCC < 25V, IREF = 1mA 1mA < IREF < 20mA (Note 2) 10Hz < f < 10kHz VREF = 0V 30 4.875 50 180 4.95 5 0.4 6 5.05 4 50 5.125 V mV mV V V mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
ELECTRICAL CHARACTERISTICS (PWM CONTROLLER) (continued)
(VCC = +15V, V+ = +3V to +5.5V referenced to PGND, RT = 10k, CT = 3.3nF, REF = open, COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. TJ = TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER CURRENT-SENSE AMPLIFIER Current-Sense Gain Maximum Current-Sense Signal Power-Supply Rejection Ratio Current-Sense Input Bias Current Current Sense to OUT Delay MOSFET DRIVER OUT Low-Side On-Resistance OUT High-Side On-Resistance Source Current (Peak) Sink Current (Peak) Rise Time Fall Time Startup Voltage Threshold Minimum Operating Voltage After Turn-On Undervoltage-Lockout Hysteresis Maximum Duty Cycle Minimum Duty Cycle SUPPLY CURRENT Startup Supply Current Operating Supply Current VCC Zener Voltage ISTART ICC VZ VCC = 7.5V VFB = VCS = 0V ICC = 25mA 24 32 3 26.5 65 5 A mA V VRDS_ONL VRDS_ONH ISOURCE ISINK tR tF VCC_START VCC_MIN UVLOHYST DMAX DMIN 94.5 ISINK = 200mA ISOURCE = 100mA CLOAD = 10nF CLOAD = 10nF CLOAD = 1nF CLOAD = 1nF 7.98 7.1 TJ = -40C to +85C (Note 2) TJ = -40C to +125C TJ = -40C to +85C (Note 2) TJ = -40C to +125C 4.5 4.5 3.5 3.5 2 1 15 22 8.4 7.6 0.8 96 97.5 0 8.82 8.0 10 12 7.5 10 A A ns ns V V V % % ACS VCS_MAX PSRR ICS tPWM (Notes 3, 4) (Note 3) 12V VCC 25V VCOMP = 0V 50mV overdrive 2.85 0.275 3 0.300 70 -1 60 -2.5 3.40 0.325 V/V V dB A ns SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX16809/MAX16810
UNDERVOLTAGE LOCKOUT/STARTUP
PULSE-WIDTH MODULATION (PWM)
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3
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
ELECTRICAL CHARACTERISTICS (LED DRIVER)
(V+ = +3V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Operating Supply Voltage Output Voltage Standby Current (Interface Idle, All Output Ports High Impedance) Standby Current (Interface Active, All Output Ports High Impedance) Supply Current (Interface Idle, All Output Ports Active Low) INTERFACE (DIN, CLK, DOUT, LE, OE) Input-Voltage High (DIN, CLK, LE, OE) Input-Voltage Low (DIN, CLK, LE, OE) Hysteresis Voltage (DIN, CLK, LE, OE) Input Leakage Current (DIN, CLK) OE Pullup Current to V+ LE Pulldown Current to PGND Output-Voltage High (DOUT) Output-Voltage Low (DOUT) VIH VIL VHYST ILEAK IOE ILE VOH VOL V+ = 5.5V, OE = PGND V+ = 5.5V, LE = V+ ISOURCE = 4mA ISINK = 4mA 0C TA +125C, VOUT = 1V to 2.5V, RSET = 360 TA = -40C, VOUT = 1V to 2.5V, RSET = 360 OE = V+ VOUTTH tWD V+ = 5.5V, OE = V+ V+ = 5.5V 0.1 0.8 1 2.5 43.25 40 47.5 -1 0.25 0.25 V+ - 0.5V 0.5 51.75 mA 55 1 A V s 1.5 1.5 0.8 +1 25 25 0.7 x V+ 0.3 x V+ V V V A A A V V SYMBOL V+ VOUT_ _ RSET = 360, DIN, LE, CLK = PGND or V+, OE = V+, DOUT unconnected RSET = 360, fCLK = 5MHz, OE = V+, DIN, LE = PGND or V+, DOUT unconnected RSET = 360, OE = PGND, DIN, LE = V+, DOUT unconnected 3.6 CONDITIONS MIN 3.0 TYP MAX 5.5 36 4.5 UNITS V V mA
3.8
4.8
mA
I+
30
52.5
mA
OUT_ _ Output Current
IOUT_ _
OUT_ _ Leakage Current OUT_ _ Fault Detection Threshold (MAX16810) Watchdog Timeout Period (MAX16810)
4
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
5V TIMING CHARACTERISTICS
(V+ = +4.5V to +5.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 5)
PARAMETER CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay DOUT Rise Time DOUT Fall Time LE Pulse-Width High LE Setup Time LE Rising to OUT_ _ Rising Delay LE Rising to OUT_ _ Falling Delay CLK Rising to OUT_ _ Rising Delay CLK Rising to OUT_ _ Falling Delay OE Rising to OUT_ _ Rising Delay OE Falling to OUT_ _ Falling Delay OUT_ _ Turn-On Fall Time OUT_ _ Turn-Off Rise Time SYMBOL tCP tCH tCL tDS tDH tDO tDR tDF tLW tLS tLRR tLRF tCRR tCRF tOER tOEF tF tR (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) 80% to 20% (Note 6) 20% to 80% (Note 6) CDOUT = 10pF, 20% to 80% CDOUT = 10pF, 80% to 20% 20 15 110 340 110 340 110 340 210 130 CONDITION MIN 40 19 19 4 8 10 50 10 10 TYP MAX UNITS ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
MAX16809/MAX16810
INTERFACE TIMING CHARACTERISTICS
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5
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
3.3V TIMING CHARACTERISTICS
(V+ = +3V to < +4.5V, AGND = PGND = 0V; all voltages are measured with respect to PGND, unless otherwise noted. TA = TJ = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 5)
PARAMETERS CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay DOUT Rise Time DOUT Fall Time LE Pulse-Width High LE Setup Time LE Rising to OUT_ _ Rising Delay LE Rising to OUT_ _ Falling Delay CLK Rising to OUT_ _ Rising Delay CLK Rising to OUT_ _ Falling Delay OE Rising to OUT_ _ Rising Delay OE Falling to OUT_ _ Falling Delay OUT_ _ Turn-On Fall Time OUT_ _ Turn-Off Rise Time SYMBOL tCP tCH tCL tDS tDH tDO tDR tDF tLW tLS tLRR tLRF tCRR tCRF tOER tOEF tF tR (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) 80% to 20% (Note 6) 20% to 80% (Note 6) CDOUT = 10pF, 20% to 80% CDOUT = 10pF, 80% to 20% 20 15 140 400 140 400 140 400 275 150 CONDITIONS MIN 52 24 24 4 8 12 70 12 12 TYP MAX UNITS ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
INTERFACE TIMING CHARACTERISTICS
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6:
All devices are 100% production tested at TJ = +25C and +125C. Limits to -40C are guaranteed by design. Guaranteed by design, not production tested. Parameter is measured at trip point of latch with VFB = 0V. Gain is defined as A = VCOMP / VCS, 0.05V VCS 0.25V. See Figures 3 and 4. A 65 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.
6
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics
(VCC = +15V, V+ = 3V to 5.5V, RT = 10k, CT = 3.3nF, VREF = COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25C, unless otherwise noted.)
STARTUP CURRENT vs. TEMPERATURE
MAX16809 toc01 MAX16809 toc02
MAX16809/MAX16810
BOOTSTRAP UVLO vs. TEMPERATURE
10 9 8 7 VCC (V) 6 5 4 3 2 1 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 29 HYSTERESIS 27 25 VCC FALLING ICC (A) VCC RISING 41 39 37 35 33 31
OPERATING SUPPLY CURRENT vs. TEMPERATURE AFTER STARTUP (fOSC = fSW = 300kHz)
CT = 560pF 4.9 4.7 ICC (mA) 4.5 4.3 4.1 3.9 3.7 3.5
MAX16809 toc03
VCC = 7.5V
5.1
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
REFERENCE VOLTAGE vs. TEMPERATURE
MAX16809 toc04
REFERENCE VOLTAGE vs. REFERENCE LOAD CURRENT
MAX16809 toc05
REFERENCE VOLTAGE vs. SUPPLY VOLTAGE
4.998 4.996 4.994 VREF (V) 4.992 4.990 4.988 4.986 IREF = 1mA
MAX16809 toc06
5.08 5.06 5.04 5.02 VREF (V) 5.00 4.98 4.96 4.94 4.92 4.90 IREF = 20mA IREF = 1mA
5.05 5.00 4.95 VREF (V) 4.90 4.85 4.80 4.75 4.70 4.65
5.000
4.984 4.982 4.980 0 10 20 30 40 50 60 70 10 12 14 16 18 VCC (V) 20 22 24 26 IREF (mA)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
OSCILLATOR FREQUENCY (fOSC) vs. TEMPERATURE
540 OSCILLATOR FREQUENCY (kHz) 530 520 510 500 490 480 470 460 450 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) RT = 3.65k CT = 560pF
MAX16809 toc07
OSCILLATOR RT/CT DISCHARGE CURRENT vs. TEMPERATURE
VRT/CT = 2V RT/CT DISCHARGE CURRENT (mA) 8.02 8.00 7.98 7.96 7.94 7.92 7.90 7.88 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
MAX16809 toc08
550
8.04
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7
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
Typical Operating Characteristics (continued)
(VCC = +15V, V+ = 3V to 5.5V, RT = 10k, CT = 3.3nF, VREF = COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25C, unless otherwise noted.)
CURRENT-SENSE TRIP THRESHOLD vs. TEMPERATURE
MAX16809 toc09
TIMING RESISTANCE vs. OSCILLATOR FREQUENCY
MAX16809 toc10
OUT IMPEDANCE vs. TEMPERATURE (RDS_ON PMOS DRIVER)
5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 ISOURCE = 100mA
MAX16809 toc11 MAX16809 toc14 MAX16809 toc13
0.40 0.38 0.36 CS THRESHOLD (V) 0.34
1000 CT = 1nF 100 RT (k) CT = 560pF CT = 100pF CT = 220pF 10 CT = 10nF CT = 4.7nF CT = 3.3nF CT = 2.2nF 10k 100k 1M
0.32 0.30 0.28 0.26 0.24 0.22 0.20 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
1
0.1 10M FREQUENCY (Hz)
RDS_ON ()
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
OUT IMPEDANCE vs. TEMPERATURE (RDS_ON NMOS DRIVER)
9 8 7 RDS_ON () 6 5 4 3 2 1 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) ISINK = 200mA
MAX16809 toc12
PROPAGATION DELAY FROM CURRENT-LIMIT COMPARATOR TO OUT vs. TEMPERATURE
100 90 PROPAGATION DELAY (ns) 80 70 GAIN (dB) 60 50 40 30 20 10 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 140 120 100 80 60 40 20 0 -20
ERROR-AMPLIFIER OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
10 -15 GAIN PHASE PHASE (DEGREES) -40 -65 -90 -115 -140 -165 -190 10k 100k 1M 10M 100M
10
0.01 1
10 100 1k
FREQUENCY (Hz)
COMP VOLTAGE LEVEL TO TURN OFF DEVICE vs. TEMPERATURE
MAX16809 toc15
SUPPLY CURRENT vs. OSCILLATOR FREQUENCY
6.5 6.0 5.5 ICC (mA) 5.0 4.5 4.0 3.5 3.0 TA = +125C TA = -40C CT = 100pF
MAX16809 toc16
SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS OFF, RSET = 720)
TA = +125C
SUPPLY CURRENT (mA) 1.95
VCC = 15V 2.2 2.1 VCOMP (V) 2.0 1.9 1.8 1.7 1.6 1.5
TA = +85C
TA = +25C
1.90
TA = -40C
1.85
2.5 2.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 20 120 220 320 420 520 620 720 820 920 1020 FREQUENCY (kHz) 1.80 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
8
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MAX16809 toc17
2.3
7.0
2.00
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
Typical Operating Characteristics (continued)
(VCC = +15V, V+ = 3V to 5.5V, RT = 10k, CT = 3.3nF, VREF = COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS OFF, RSET = 360)
MAX16809 toc18
MAX16809/MAX16810
SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON, RSET = 720)
MAX16809 toc19
3.70
45 40 SUPPLY CURRENT (mA) TA = +125C 35 30 25 20 TA = -40C TA = +25C TA = +85C
SUPPLY CURRENT (mA)
3.65
TA = +125C
TA = +85C
3.60 TA = +25C 3.55 TA =-40C
3.50 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
15 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON, RSET = 360)
MAX16809 toc20
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 720, V+ = 3.3V)
TA = -40C 25 OUT_ _ CURRENT (mA) 20 15 10 5 0 TA = +25C TA = +85C TA = +125C
MAX16809 toc21
45 40 SUPPLY CURRENT (mA) 35 30 25 TA = +25C 20 15 3.0 3.5 4.0 4.5 5.0 TA = -40C TA = +85C
30
TA = +125C
5.5
0
0.5
1.0
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
OUT_ _ VOLTAGE (V)
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 360, V+ = 3.3V)
TA = -40C 50 OUT_ _ CURRENT (mA) 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUT_ _ VOLTAGE (V)
MAX16809 toc22
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 720, V+ = 5.0V)
TA = -40C 25 OUT_ _ CURRENT (mA) 20 15 10 5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 OUT_ _ VOLTAGE (V) TA = +25C TA = +85C TA = +125C
MAX16809 toc23
60
30
TA = +25C TA = +85C TA = +125C
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9
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
Typical Operating Characteristics (continued)
(VCC = +15V, V+ = 3V to 5.5V, RT = 10k, CT = 3.3nF, VREF = COMP = open, CREF = 0.1F, VFB = 2V, CS = AGND = PGND = 0V. Typical values are at TA = +25C, unless otherwise noted.)
OUT_ _ CURRENT vs. OUT_ _ VOLTAGE (RSET = 360 V+ = 5.0V)
MAX16809 toc24
OUT_ _ CURRENT vs. V+ (RSET = 720, VOUT = 2V)
MAX16809 toc25
60 50 OUT_ _ CURRENT (mA) 40 30 20 10 0 0 0.5 1.0 1.5 2.0 2.5 TA = -40C
25.0
OUT_ _ CURRENT (mA)
24.5 TA = +125C 24.0
TA = +25C TA = +85C TA = +125C
TA = +85C
TA = +25C 23.5 TA = -40C
23.0 3.0 3.0 3.5 4.0 4.5 5.0 5.5 OUT_ _ VOLTAGE (V) SUPPLY VOLTAGE (V)
OUT_ _ CURRENT vs. V+ (RSET = 360, VOUT = 2V)
MAX16809 toc26
OUT_ _ CURRENT vs. SET RESISTANCE (V+ = 5.0V)
MAX16809 toc27
49
50
40 OUT_ _ CURRENT (mA)
OUT_ _ CURRENT (mA)
48 TA = -40C
TA = +25C
30
20
47 TA = +125C 46 3.0 3.5 4.0
TA = +85C
10
0 4.5 5.0 5.5 0 1 2 3 4 5 SUPPLY VOLTAGE (V) SET RESISTANCE (k)
10
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
Pin Description
PIN 1, 31, 32, 36, 38 2 3 4-11 12 13 14 15 16, 17 18 19 20 21-28 29 30 33 34 35 37 -- NAME N.C. FB COMP FUNCTION No Connection. Not internally connected. Leave unconnected. Error-Amplifier Inverting Input Error-Amplifier Output Active-Low, Output Enable Input. Drive OE low to PGND to enable the OUT0-OUT15. Drive OE high to disable OUT0-OUT15. Serial-Data Output. Data is clocked out of the 16-bit internal shift register to DOUT on CLK's rising edge. LED Current Setting. Connect RSET from SET to PGND to set the LED current. LED Driver Positive Supply Voltage. Bypass V+ to PGND with a 0.1F ceramic capacitor. Power Ground Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK's rising edge. Serial-Clock Input 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. LED Driver Outputs. OUT0-OUT7 are open-drain, constant-current-sinking outputs rated for 36V. 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. PWM Controller Current-Sense Input Analog Ground MOSFET Driver Output OUT. Connects to the gate of the external n-channel MOSFET. Power-Supply Input. Bypass VCC to AGND with a 0.1F ceramic capacitor or a parallel combination of a 0.1F and a higher value ceramic capacitor. 5V Reference Output. Bypass REF to AGND with a 0.1F ceramic capacitor. Exposed Paddle. Connect to the ground plane for improved power dissipation. Do not use as the only ground connection.
MAX16809/MAX16810
OUT8-OUT15 LED Driver Outputs. OUT8-OUT15 are open-drain, constant-current-sinking outputs rated for 36V. OE DOUT SET V+ PGND DIN CLK LE OUT0-OUT7 RTCT CS AGND OUT VCC REF EP
Detailed Description
The MAX16809/MAX16810 LED drivers include an internal switch-mode controller that can be used as boost or buck-boost (SEPIC) converters to generate the voltage necessary to drive the multiple strings of LEDs. These devices incorporate an integrated low-side driver, a programmable oscillator (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, 1b, and 1c). The MAX16809/MAX16810 LED drivers include a 4-wire serial interface and a current-mode PWM controller to generate the necessary voltage for driving 16 opendrain, constant-current-sinking output ports. The drivers
use 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 transparent latch. The shift register is written through a clock input, CLK, and a data input, DIN, and the data propagates 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 driver output is an open-drain, constant-current sink that should be connected to the
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
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 devices can operate in a stand-alone mode (see the Typical Operating Circuits). The MAX16810 includes circuitry that automatically detects open-circuit LEDs. Fault status is loaded into the serial-interface shift register when LE goes high and is automatically shifted out on DOUT when the next data transmission is shifted in. The MAX16810 also features a watchdog that monitors activity on the CLK, DIN, and LE inputs (see the Watchdog (MAX16810) section). The number of channels can be expanded by using the MAX6970 and MAX6971 family in conjunction with the MAX16809 and MAX16810.
UVLO
VOLTAGEDIVIDER VCC 26.5V
REFERENCE 2.5V
PREREG 5V THERMAL SHUTDOWN
MAX16809
EN_REF BG SNS REG_OK DELAY
VDD REF
5V REG
VOLTAGE DIVIDER
AGND VCC 300mV ILIM
S R CPWM 2R
Q
OUT
CS
VEA FB COMP R
CLK OSC Q RTCT
CLK SERIAL-TO-PARALLEL SHIFT REGISTER DIN D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 DOUT
OUTPUT LATCHES LE D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 POWER-ON RESET V+
OE
V+ CONSTANT-CURRENT SINK THERMAL SHUTDOWN D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 CURRENT REFERENCE SET
PGND OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15
Figure 1a. Internal Block Diagram (MAX16809)
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
UVLO
VOLTAGEDIVIDER VCC 26.5V
REFERENCE 2.5V
PREREG 5V THERMAL SHUTDOWN EN_REF VDD
MAX16810
REG_OK DELAY AGND
BG SNS
5V REG
REF
VOLTAGE DIVIDER
VCC 300mV ILIM
S R CPWM 2R
Q
OUT
CS
VEA FB COMP R
CLK OSC Q RTCT
CLK SERIAL-TO-PARALLEL SHIFT REGISTER DIN D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 DOUT
OUTPUT LATCHES LE D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 POWER-ON RESET V+
OE WATCHDOG V+ CONSTANT-CURRENT SINK THERMAL SHUTDOWN D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 CURRENT REFERENCE SET
FAULT DETECTION (MAX16810 ONLY) PGND OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14 OUT15
Figure 1b. Internal Block Diagram (MAX16810)
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
V+
68W/L 1.23 REST
W/L
OUT_ _
1.23V
945R
R
SET
PGND
Figure 1c. OUT_ _ Driver Internal Diagram
OUT is a push-pull output with the on-resistance of the pMOS typically 3.5 and the on-resistance of the nMOS typically 4.5. The driver can source 2A and sink 1A typically. This allows for the MAX16809/MAX16810 to quickly turn on and off high gate-charge MOSFETs. Bypass VCC with one or more 0.1F 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 dissipation in the MAX16809/MAX16810 is a function of the average output drive current (IDRIVE). Use the following equation to calculate the power dissipation in the device due to IDRIVE: IDRIVE = (QG x fSW) PD = (IDRIVE + ICC) x VCC where I CC is the operating supply current. See the Typical Operating Characteristics for the operating supply current at a given frequency.
Switch-Mode Controller
Current-Mode Control Loop
The advantages of current-mode control over voltagemode control are twofold. First, there is the feed-forward characteristic brought on by the controller's ability to adjust for variations in the input voltage on a cycleby-cycle basis. Second, the stability requirements of the current-mode controller are reduced to that of a single-pole system unlike the double pole in the voltagemode control scheme. The MAX16809/MAX16810 use 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 comparator, 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.
Error Amplifier
The MAX16809/MAX16810 include 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 formula to set the output voltage: R1 VOUT = 1 + x VFB R2 where VFB = 2.5V.
Oscillator
The oscillator frequency is programmable using an external capacitor and a resistor at RTCT (see RTCT 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 R T again. The oscillator's period is the sum of the charge and discharge times of C T . Calculate the charge time as follows: tC = 0.57 x RT x CT where t C is in seconds, R T in ohms (), and C T in Farads (F). The discharge time is then: tD = (RT x CT x 1000) / [(4.88 x RT) - (1.8 x 1000)] where t D is in seconds, R T in ohms (), and C T in Farads (F).
Undervoltage Lockout (UVLO)
The turn-on supply voltage for the MAX16809/ MAX16810 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/MAX16810 operate 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 32A (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.
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
The oscillator frequency is then: 1 fOSC = tC + tD) ( RCS = VCS IP -P
MAX16809/MAX16810
Reference Output
REF is a 5V reference output that can source 20mA. Bypass REF to AGND with a 0.1F capacitor.
Current Limit
The MAX16809/MAX16810 include 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 voltage trip level (VCS) of 0.3V. Use the following equation to calculate RCS:
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 comparator 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/MAX16810 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.
VIN
L1
C1
D
VOUT
COUT Q1 L2 R1 CC2 CC1 RC1 R2 OUT CS AGND VCC CIN
3V TO 5.5V
RCS
COMP FB
V+ CBYP PGND
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14
DIN LE EXTERNAL CLOCK INPUT EXTERNAL DIM INPUT CLK DOUT OE
MAX16809 MAX16810
SET REF RSET CREF RT
OUT15 RTCT
CT
Figure 2. Buck-Boost (SEPIC) Operation
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
LED Driver
4-Wire Interface
The MAX16809/MAX16810 also operate in a standalone mode (see the Typical Operating Circuits). For use with a microcontroller, the MAX16809/MAX16810 feature 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/ MAX16810. 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/MAX16810's 16-bit shift register on its rising edge. LE is the latch-enable input of the MAX16809/MAX16810 that transfers data from the 16-bit shift register to its 16bit output latches (transparent latch). The data latches on the falling edge of LE (Figure 4). The fourth input (OE) provides 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 follow 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/MAX16810's 16-bit shift register 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.
Table 1. 4-Wire Serial-Interface Truth Table
BLANKING OUTPUT CONTENTS SERIAL CLOCK SHIFT REGISTER CONTENTS LOAD LATCH CONTENTS INPUT INPUT CURRENT AT OUT_ _ DATA INPUT INPUT CLK D0 D1 D2 ... Dn-1 Dn LE D0 D1 D2 ... Dn-1 Dn OE D0 D1 D2 ... Dn-1 Dn DIN H L X H L R0 X P0 R0 R1 ... Rn-2 Rn-1 R0 R1 ... Rn-2 Rn-1 R1 R2 ... Rn-1 X P1 X ... X P2 ... Pn-1 Rn X Pn L H R0 R1 R2 P0 X P1 X P2 X ... Rn-1 Rn ... Pn-1 Pn ... X X L H P0 L P1 P2 L L ... ... Pn-1 L Pn L
L = Low Logic Level H = High Logic Level X = Don't Care P = Present State (Shift Register) R = Previous State (Latched)
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
LE tCL tCH tCP CLK tDH tDS DIN D15 D14 D1 tDO DOUT D15 D0 tLS tLW
OE tOEF
tOEW
tOER 80% 20% tf tr
OUT_ _
Figure 3. 4-Wire Serial-Interface Timing Diagram
Watchdog (MAX16810)
LE tLRF OUT_ _
LE tLRR OUT_ _
CLK tCRF OUT_ _
CLK tCRR OUT_ _
The MAX16810 includes a watchdog circuit that monitors the CLK, DIN, and LE inputs. If there is no transition on any one of these inputs for nominally 1s, the output latches are cleared and outputs OUT0-OUT15 go high impedance like the initial power-up condition. This turns off all LEDs connected to the outputs. The shift-register data does not change, just the outputlatch data. When the watchdog triggers, the outputs remain off until the driver output latches are updated with data turning them on. Recovery is therefore automatic if the transmission failure is temporary because the MAX16810 does not lock up in the watchdog timeout state. The MAX16810 operates correctly when the serial interface is next activated, and the watchdog circuit is reset and starts monitoring the serial interface again. The watchdog function requires no software change to the application driving the MAX16810. The rise time for CLK, DIN, and LE should be less than 10s.
Figure 4. LE and CLK to OUT_ _ Timing
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17
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
LED Fault Detection (MAX16810)
The MAX16810 includes circuitry that detects open-circuit LEDs automatically. An open-circuit fault occurs when an output is sinking current less than approximately 50% of the programmed current flows. Open circuits are checked just after the falling edge of OE. The fault data is latched on the rising edge of LE and is shifted out when new LED data is loaded into the output latches from the shift register. If one or more output ports are detected with an open-circuit fault, the D14 and D13 bits of DOUT go high. If no open-circuit faults are detected, D14 and D13 are set to low. The data in the other 14 bit positions in DOUT are not altered. Fault status is shifted out on DOUT for the first two rising edges of the clock after the falling edge of LE (see Figure 5). LE is normally taken high after all 16 bits of new LED data have been clocked into the shift register(s), and then DOUT outputs data bit D15. A typical fault-detecting application tests all the shifted out data. Bits D0-D12 and D15 are checked against the originally transmitted data to check data-link integrity. Bits D13 and D14 are checked first to see that they contain the same data (validating the status), and second, whether faults are reported or not by the actual logic level.
OE
Selecting External Component RSET to Set LED Output Current
The MAX16809/MAX16810 use an external resistor, RSET, to set the LED current for outputs OUT0-OUT15. The minimum allowed value of RSET is 311, which sets the output currents to 55mA. The maximum allowed value of RSET is 5k (IOUT_ _ = 3.6mA) and maximum allowed capacitance at SET is 100pF. Use the following formula to set the output current: RSET = 17,100V IOUT _ _
where IOUT_ _ is the desired output current in milliamps and the value for RSET is in ohms.
Overtemperature Cutoff
The MAX16809/MAX16810 contain an internal temperature sensor that turns off all outputs when the die temperature exceeds +165C. The outputs are enabled again when the die temperature drops below +140C. Register contents 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.
Stand-Alone Operation
In stand-alone operation, the MAX16809/MAX16810 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.
LE CLK DOUT D15 D14 D13 D12
FAULT STATUS BITS
Figure 5. Fault Timing
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
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 proportional to the PWM duty cycle.
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 configuration. 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 configuration). 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.
MAX16809/MAX16810
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 MAX16809/MAX16810:
i = 15 PD = DUTY x (V + x I+) + VOUTi x IOUTi i=0 + (VCC x ICC)
where: V+ = supply voltage I+ = V+ operating supply current DUTY = PWM duty cycle applied to OE V OUTi = MAX16809/MAX16810 port output voltage when driving load LED(s) IOUTi = LED drive current programmed by RSET PD = power dissipation
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
Typical Operating Circuits (continued)
VIN L D VOUT LEDs
COUT R1 CC2 CC1
RCS
RC1 R2
OUT CS AGND VCC CIN
3V TO 5.5V
COMP FB
V+ CBYP PGND
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 OUT9 OUT10 OUT11 OUT12 OUT13 OUT14
MAX16809 MAX16810
SCLK C MOSI MISO LOAD ENABLE CLK DIN DOUT LE OE
SET RSET CREF
OUT15 REF RT CT RTCT OPERATION WITH MICROCONTROLER
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
Pin Configuration
PROCESS: BiCMOS
OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 OUT0 RTCT
Chip Information
MAX16809/MAX16810
TOP VIEW
N.C. CS
31 30 29 28 27 26 25 24 23 22 21 20 N.C. 32 AGND 33 OUT 34 VCC 35 N.C. 36 REF 37 N.C. 38 19 CLK 18 DIN 17 PGND
LE 16 PGND 15 V+ 14 SET 13 DOUT OE
MAX16809 MAX16810
+
1 N.C. 2 FB 3 COMP 4 OUT8 5 OUT9 6 OUT10 7 OUT11 8 OUT12 9 OUT13 10 11 12 OUT14 OUT15
TQFN
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Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller MAX16809/MAX16810
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
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38L THIN QFN.EPS
Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX16809/MAX16810
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23
(c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Heaney

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