MAX6971AUG+T【PDF 1/12 页】IC LED DRIVER LINEAR 24-TSSOP

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Sheet目录341

[1页]2页 3页 4页 5页

ATION

EVALU

AVAIL

19-3808; Rev 1; 10/07

KIT

ABLE

16-Port, 36V Constant-Current LED Driver

General Description

The MAX6971 serial-interfaced LED driver provides 16

open-drain, constant-current-sinking LED driver outputs

rated at 36V. The MAX6971 operates from a 3V to 5.5V

supply. The MAX6971 supply and the LEDs’ supply or

supplies can power up in any order. The constant-cur-

rent outputs are programmed together to up to 55mA

using a single external resistor. The MAX6971 operates

with a 25Mb, industry-standard, 4-wire serial interface.

The MAX6971 uses the industry-standard, shift-register-

plus-latch-type serial interface. The driver accepts data

shifted into a 16-bit shift register using data input DIN

and clock input CLK. Input data appears at the DOUT

output 16 clock cycles later to allow cascading of multi-

ple MAX6971s. The latch-enable input, LE, loads the 16

bits of shift register data into a 16-bit output latch to set

which LEDs are on and which are off. The output-

enable, OE, gates all 16 outputs on and off, and is fast

enough to be used as a PWM input for LED intensity

Features

? 25Mb, Industry-Standard, 4-Wire Serial Interface

? 3V to 5.5V Logic Supply

? 16 Constant-Current LED Outputs Rated at 36V

? Up to 55mA Continuous Current per Output

? Output Current Programmed by Single Resistor

? 3% Current Matching Between Outputs

? 6% Current Matching Between ICs

? High-Dissipation, 24-Pin Packages

? -40°C to +125°C Temperature Range

Ordering Information

control.

For applications requiring LED fault detection, refer to

the MAX6983, which automatically detects open-circuit

LEDs.

PART

MAX6971AUG

MAX6971ANG

TEMP RANGE

-40°C to +125°C

PIN-PACKAGE

24 TSSOP

24 Narrow PDIP

For safety-related applications requiring a watchdog

timer, refer to the MAX6983, which includes a fail-safe

feature that blanks the display if the serial interface

becomes inactive for more than 1s.

The MAX6971 is one of a family of 12 shift-register-plus-

latch-type LED drivers. The family includes 8-port and

16-port types, with 5.5V- or 36V-rated LED outputs, with

and without open-circuit LED detection and watchdog.

All versions operate from a 3V to 5.5V supply, and are

specified over the -40°C to +125°C temperature range.

Typical Application Circuit and Selector Guide appear at

end of data sheet.

Pin Configuration

TOP VIEW

GND 1

DIN 2

24 V+

23 SET

Applications

CLK 3

22 DOUT

Variable Message Signs

Marquee Displays

Point-of-Order Signs

Traffic Signs

Gaming Features

Architectural Lighting

LE 4

OUT0 5

OUT1 6

OUT2 7

OUT3 8

OUT4 9

OUT5 10

OUT6 11

OUT7 12

MAX6971AUG

MAX6971ANG

21 OE

20 OUT15

19 OUT14

18 OUT13

17 OUT12

16 OUT11

15 OUT10

14 OUT9

13 OUT8

TSSOP/PDIP

________________________________________________________________ Maxim Integrated Products

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.

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