MAX16809 Datasheet, PDF (1/23 Pages) Maxim Integrated Products – Integrated 16-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller

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-efficien-
cy 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 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 chan-
nels. Dimming frequency range is 50Hz to 30kHz and
dimming ratio is up to 5000:1. The constant-current out-
puts are single resistor programmable and the LED cur-
rent can be adjusted up to 55mA per output channel.
The MAX16809/MAX16810 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-
standard, 4-wire serial interface. The MAX16810 includes
a watchdog and circuitry that automatically detects
open-circuit LEDs.
The MAX16809/MAX16810 include overtemperature pro-
tection, operate over the full -40°C to +125°C 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.
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
MAX16810
RT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
RTCT
CREF
CT
VOUT
R1
R2
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
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
PKG
CODE
MAX16809ATU+ -40°C to +125°C 38 TQFN-EP** T3857-1
MAX16810ATU+* -40°C to +125°C 38 TQFN-EP** T3857-1
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed paddle.
Typical Operating Circuits
LEDs
STAND-ALONE OPERATION
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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