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.

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

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

Integrated 8-Channel LED Drivers with

Switch-Mode Boost and SEPIC Controller

________________________________________________________________

Maxim Integrated Products

1

19-0655; Rev 0; 10/06

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.

Pin Configurations appear at end of data sheet.

Ordering Information

PART

TEMP

RANGE

PIN-PACKAGE

PKG

CODE

MAX16807AUI+

-40°C to +125°C 28 TSSOP-EP** U28ME-1

MAX16808AUI+*-40°C to +125°C 28 TSSOP-EP** U28ME-1

MAX16807

MAX16808

OUT0

FB

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

SET

LE

D N

PGND

V+

OE

DOUT

CLK

REF

RTCT

OUT CS AGND

COMP

R2

R1

3V TO 5 5V

Q

L

D

LEDs

STAND ALONE OPERATION

Typical Operating Circuits

+

Denotes lead-free package.

*

Future product—contact factory for availability.

**

EP = Exposed paddle.

Typical Operating Circuits continued at end of data sheet.