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MAX16809ATU+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
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 con-
troller 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, con-
stant-current-sinking LED driver outputs rated for 36V
continuous operation. The LED current-control 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 dim-
ming 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 paddle 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
Automotive Navigation, Heads-Up,
and Infotainment Displays
Industrial and Medical Displays
Ambient, Mood, and Accent Lighting
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
________________________________________________________________
Maxim Integrated Products
1
19-0656; Rev 2; 8/09
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.
EVALUATION KIT
AVAILABLE
Pin Configuration appears at end of data sheet.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX16809ATU+ -40°C to +125°C 38 TQFN-EP*
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
OUT0
FB
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
SET
LE
DIN
PGND
V
CC
V+
OE
DOUT
CLK
REF
RTCT
C
REF
R
SET
C
IN
C
BYP
R
CS
C
C2
C
C1
OUT CS AGND COMP
R
C1
R2
R1
C
OUT
R
T
C
T
3V TO 5.5V
V
IN
V
OUT
Q1
L
LEDs
STAND-ALONE OPERATION
MAX16809
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
Typical Operating Circuits
Typical Operating Circuits continued at end of data sheet.
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS (PWM CONTROLLER)
(V
CC
= +15V, V+ = +3V to +5.5V referenced to PGND, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, COMP = open, C
REF
= 0.1μF, V
FB
= 2V,
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T
J
= T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
V
CC
to AGND..........................................................-0.3V to +30V
Current into V
CC
(V
CC
> 24V) .............................................30mA
V+ to PGND..............................................................-0.3V to +6V
OUT to AGND.............................................-0.3V to (V
CC
+ 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 (T
A
= +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).
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
REFERENCE
Output Voltage V
REF
I
REF
= 1mA, T
J
= +25°C 4.95 5 5.05 V
Line Regulation ΔV
LINE
12V< V
CC
< 25V, I
REF
= 1mA 0.4 4 mV
Load Regulation ΔV
LOAD
1mA < I
REF
< 20mA 6 50 mV
Total Output-Voltage Variation V
REFT
(Note 2) 4.875 5.125 V
Output Noise Voltage V
NOISE
10Hz < f < 10kHz 50 μV
Output Short-Circuit Current I
SHORT
V
REF
= 0V 30 180 mA
OSCILLATOR
Initial Accuracy T
J
= +25°C 51 54 57 kHz
Voltage Stability 12V < V
CC
< 25V 0.2 0.5 %
Temperature Stability 1%
RTCT Ramp Peak-to-Peak 1.7 V
RTCT Ramp Valley 1.1 V
V
RTCT
= 2V, T
J
= +25°C 7.9 8.3 8.7
Discharge Current I
DIS
V
RTCT
= 2V, -40
o
C ≤ T
J
≤ +125°C 7.5 8.3 9.0
mA
Frequency Range f
OSC
20 1000 kHz
ERROR AMPLIFIER
FB Input Voltage V
FB
FB shorted to COMP 2.45 2.5 2.55 V
Input Bias Current I
B(FB)
-0.01 -0.1 μA
Open-Loop Gain A
VOL
2V ≤ V
COMP
≤ 4V 100 dB
Unity-Gain Bandwidth f
GBW
1 MHz
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V 60 80 dB
COMP Sink Current I
SINK
V
FB
= 2.7V, V
COMP
= 1.1V 2 6 mA
COMP Source Current I
SOURCE
V
FB
= 2.3V, V
COMP
= 5V 0.5 1.2 1.8 mA
COMP Output-Voltage High V
OH
V
FB
= 2.3V, R
COMP
= 15kΩ to AGND 5 5.8 V
COMP Output-Voltage Low V
OL
V
FB
= 2.7V, R
COMP
= 15kΩ to V
REF
0.1 1.1 V
MAX16809
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (PWM CONTROLLER) (continued)
(V
CC
= +15V, V+ = +3V to +5.5V referenced to PGND, R
T
= 10kΩ, C
T
= 3.3nF, REF = open, COMP = open, C
REF
= 0.1μF, V
FB
= 2V,
CS = AGND, AGND = PGND = 0V; all voltages are measured with respect to AGND, unless otherwise noted. T
J
= T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CURRENT-SENSE AMPLIFIER
Current-Sense Gain A
CS
(Notes 3, 4) 2.85 3 3.40 V/V
Maximum Current-Sense Signal V
CS_MAX
(Note 3) 0.275 0.300 0.325 V
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V 70 dB
Current-Sense Input Bias Current I
CS
V
COMP
= 0V -1 -2.5 μA
Current Sense to OUT Delay t
PWM
50mV overdrive 60 ns
MOSFET DRIVER
T
J
= -40°C to +85°C (Note 2) 4.5 10
OUT Low-Side On-Resistance V
RDS_ONL
I
SINK
= 200mA
T
J
= -40°C to +125°C 4.5 12
Ω
T
J
= -40°C to +85°C (Note 2) 3.5 7.5
OUT High-Side On-Resistance V
RDS_ONH
I
SOURCE
=
100mA
T
J
= -40°C to +125°C 3.5 10
Ω
Source Current (Peak) I
SOURCE
C
LOAD
= 10nF 2 A
Sink Current (Peak) I
SINK
C
LOAD
= 10nF 1 A
Rise Time t
R
C
LOAD
= 1nF 15 ns
Fall Time t
F
C
LOAD
= 1nF 22 ns
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold V
CC_START
7.98 8.4 8.82 V
Minimum Operating Voltage After
Turn-On
V
CC_MIN
7.1 7.6 8.0 V
Undervoltage-Lockout Hysteresis UVLO
HYST
0.8 V
PULSE-WIDTH MODULATION (PWM)
Maximum Duty Cycle D
MAX
94.5 96 97.5 %
Minimum Duty Cycle D
MIN
0%
SUPPLY CURRENT
Startup Supply Current I
START
V
CC
= 7.5V 32 65 μA
Operating Supply Current I
CC
V
FB
= V
CS
= 0V 3 5 mA
V
CC
Zener Voltage V
Z
I
CC
= 25mA 24 26.5 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX16809ATU+T

Mfr. #:
Buy MAX16809ATU+T
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers 8Ch w/Switch-Mode Boost & SEPIC Ctlr
Lifecycle:
New from this manufacturer.
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