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MAX16807AUI

Description
Integrated 8-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller
File Size291KB,21 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX16807AUI Overview

Integrated 8-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller

www.DataSheet4U.com
19-0655; Rev 0; 10/06
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
General Description
The MAX16807/MAX16808 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 MAX16807/
MAX16808’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
MAX16807/MAX16808 feature an 8V to 26.5V input volt-
age range. A wide range of adjustable frequency
(20kHz to 1MHz) allows design optimization for efficien-
cy and minimum board space.
The MAX16807/MAX16808 LED drivers include eight
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 MAX16807/MAX16808 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-
standard, 4-wire serial interface. The MAX16808 includes
circuitry that automatically detects open-circuit LEDs.
The MAX16807/MAX16808 include overtemperature
protection, operate over the full -40°C to +125°C tem-
perature range, and are available in a thermally
enhanced, 28-pin TSSOP exposed paddle package.
Pin Configurations appear at end of data sheet.
Features
Eight 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 (MAX16808)
4-Wire Serial Interface to Control Individual
Output Channels
MAX16807/MAX16808
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
MAX16807
AUI+
MAX16808
AUI+*
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
-40°C to +125°C 28 TSSOP-EP** U28ME-1
-40°C to +125°C 28 TSSOP-EP** U28ME-1
+Denotes
lead-free package.
*Future
product—contact factory for availability.
**EP
= Exposed paddle.
Typical Operating Circuits
V
IN
L
V
OUT
D
C
OUT
Q
R1
LEDs
R
CS
C
C1
C
C2
R
C1
R2
3V TO 5.5V
OUT CS AGND
V
CC
C
IN
COMP
FB
V+
C
BYP
PGND
LE
DIN
CLK
DOUT
OE
SET
REF
R
SET
C
REF
R
T
C
T
RTCT
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
STAND-ALONE OPERATION
MAX16807
MAX16808
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.

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