MAX16807_09 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – Integrated 8-Channel LED Driver with Switch-Mode Boost and SEPIC Controller

19-0655; Rev 2; 8/09
EVAALVUAAILTAIOBNLEKIT
Integrated 8-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
General Description
The MAX16807 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 MAX16807 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 MAX16807 features an 8V to 26.5V
input voltage range. A wide range of adjustable fre-
quency (20kHz to 1MHz) allows design optimization for
efficiency and minimum board space.
The MAX16807 LED driver includes eight 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 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 MAX16807 operates either in stand-alone mode or
with a microcontroller (µC) using an industry-standard, 4-
wire serial interface.
The MAX16807 includes overtemperature protection,
operates over the full -40°C to +125°C temperature
range, and is available in a thermally enhanced, 28-pin
TSSOP exposed paddle package.
Pin Configuration appears at end of data sheet.
Features
o Eight Constant-Current Output Channels (Up to
55mA Each)
o ±3% Current Matching Among Outputs
o Paralleling Channels Allows Higher Current per
LED String
o Output Rated for 36V Continuous Voltage
o Output-Enable Pin for PWM Dimming (Up to 30kHz)
o One Resistor Sets LED Current for All Channels
o Wide Dimming Ratio Up to 5000:1
o Low Current-Sense Reference (300mV) for High
Efficiency
o 8V to 26.5V Input Voltage or Higher with External
Biasing Devices
o 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
MAX16807AUI+ -40°C to +125°C
28 TSSOP-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuits
VIN
3V TO 5.5V
CIN
CBYP
RSET
L
D
Q
COUT
CC2
RCS
CC1
RC1
OUT CS AGND
VCC
COMP
FB
V+
PGND
LE
DIN
CLK
DOUT
OE
SET
REF
OUT0
OUT1
MAX16807
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
RTCT
RT
CREF
CT
VOUT
R1
LEDs
R2
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.