MAX16808 Maxim Integrated Products, MAX16808 Datasheet

MAX16808

Manufacturer Part Number

MAX16808

Description

(MAX16807 / MAX16808) Integrated 8-Channel LED Drivers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX16808.pdf (21 pages)

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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.

19-0655; Rev 0; 10/06

Pin Configurations appear at end of data sheet.

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.

Switch-Mode Boost and SEPIC Controller

________________________________________________________________ Maxim Integrated Products

Integrated 8-Channel LED Drivers with

General Description

3V TO 5.5V

SET

BYP

V+

PGND

DIN

CLK

DOUT

SET

OUT CS AGND

REF

MAX16807

MAX16808

COMP

RTCT

OUT0

OUT1

OUT2

OUT3

OUT4

OUT5

OUT6

OUT7

OUT

♦ Eight Constant-Current Output Channels (Up to

♦ ±3% Current Matching Among Outputs

♦ Paralleling Channels Allows Higher Current per

♦ 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

♦ 8V to 26.5V Input Voltage or Higher with External

♦ Open LED Detection (MAX16808)

♦ 4-Wire Serial Interface to Control Individual

+ Denotes lead-free package.

* Future product—contact factory for availability.

** EP = Exposed paddle.

Typical Operating Circuits continued at end of data sheet.

M A X1 6 8 0 7 AU I+

M A X1 6 8 0 8 AU I+ *

OUT

55mA Each)

LED String

Efficiency

Biasing Devices

Output Channels

STAND-ALONE OPERATION

PA R T

LCD White or RGB LED Backlighting:

Ambient, Mood, and Accent Lighting

LCD TVs, Desktop, and Notebook Panels

Automotive Navigation, Heads-Up,

and Infotainment Displays

Industrial and Medical Displays

Typical Operating Circuits

- 40°C to + 125°C 28 TS S O P - E P ** U 28M E - 1

R A N G E

T EM P

Ordering Information

LEDs

PIN - PA C K A G E

Applications

Features

C O D E

PK G

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