MAX16809_09 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Integrated 16-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

19-0656; Rev 2; 8/09
EVAALVUAAILTAIOBNLEKIT
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
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.
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
♦ 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
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.
Typical Operating Circuits
VIN
CIN
3V TO 5.5V
CBYP
RSET
L
Q1
COUT
CC2
RCS
CC1
RC1
OUT CS AGND COMP
VCC
FB
V+
PGND
LE
DIN
CLK
DOUT
OE
SET
REF
MAX16809
RT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
RTCT
CREF
CT
VOUT
R1
R2
LEDs
STAND-ALONE OPERATION
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.