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General Description

The MAX6969 serial-interfaced LED driver provides 16

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

rated at 5.5V. The MAX6969 operates from a 3V to 5.5V

supply. The MAX6969 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 MAX6969 operates

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

The MAX6969 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 MAX6969s. 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

control.

For applications requiring LED fault detection, refer to

the MAX6984*, which automatically detects open-circuit

LEDs.

For safety-related applications requiring a watchdog

timer, refer to the MAX6979, which includes a fail-safe

feature that blanks the display if the serial interface

becomes inactive for more than 1s.

The MAX6969 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.

Features

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

at 5V

♦ 3V to 5.5V Logic Supply

♦ 16 Constant-Current LED Outputs Rated at 5.5V

♦ 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

MAX6969

16-Port, 5.5V Constant-Current LED Driver

________________________________________________________________ Maxim Integrated Products 1

V+

SET

DOUT

OELE

CLK

DIN

GND

TOP VIEW

OUT15

OUT14

OUT13

OUT12OUT3

OUT2

OUT1

OUT0

OUT11

OUT10

OUT9

OUT8OUT7

OUT6

OUT5

OUT4

TSSOP/PDIP/SO

MAX6969AUG

MAX6969ANG

MAX6969AWG

Pin Configuration

Ordering Information

19-3677; Rev 3; 6/10

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.

Typical Application Circuit and Selector Guide appear at

end of data sheet.

EVALUATION KIT

AVAILABLE

Applications

Variable Message Signs

Marquee Displays

Point-of-Order Signs

Traffic Signs

Gaming Features

Architectural Lighting

PART TEMP RANGE PIN-PACKAGE

MAX6969AUG+ -40°C to +125°C 24 TSSOP

MAX6969AWG+ -40°C to +125°C 24 Wide SO

MAX6969ANG+ -40°C to +125°C 24 PDIP

+Denotes a lead(Pb)-free/RoHS-compliant package.

*Future product—contact factory for availability.

Summary of content (12 pages)

PAGE 1
9-3677; Rev 3; 6/10 KIT ATION EVALU LE B A IL A AV 16-Port, 5.5V Constant-Current LED Driver The MAX6969 serial-interfaced LED driver provides 16 open-drain, constant-current-sinking LED driver outputs rated at 5.5V. The MAX6969 operates from a 3V to 5.5V supply. The MAX6969 supply and the LEDs’ supply or supplies can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor.
PAGE 2
MAX6969 16-Port, 5.5V Constant-Current LED Driver ABSOLUTE MAXIMUM RATINGS Voltage with respect to GND. V+ ............................................................................-0.3V to +6V OUT_ .......................................................................-0.3V to +6V DIN, CLK, LE, OE, SET ................................-0.3V to (V+ + 0.3V) DOUT Current ..................................................................±10mA OUT_ Sink Current ................................................
PAGE 3
16-Port, 5.5V Constant-Current LED Driver (Typical Application Circuit, V+ = 4.5V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 4
3.3V TIMING CHARACTERISTICS (Typical Application Circuit, V+ = 3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.
PAGE 5
16-Port, 5.5V Constant-Current LED Driver 16 TA = +25°C 14 60 TA = -40°C 20 TA = +25°C TA = +85°C 15 TA = +125°C 10 50 TA = -40°C 40 TA = +25°C TA = +85°C 30 TA = +125°C 20 5 12 MAX6969 toc06 25 PORT OUTPUT CURRENT vs. PORT OUTPUT VOLTAGE (RSET = 360Ω, V+ = 3.3V) PORT OUTPUT CURRENT (mA) 18 30 MAX6969 toc05 20 SUPPLY CURRENT (mA) TA = +85°C TA = +125°C PORT OUTPUT CURRENT vs. PORT OUTPUT VOLTAGE (RSET = 720Ω, V+ = 3.
PAGE 6
16-Port, 5.5V Constant-Current LED Driver MAX6969 Pin Description PIN NAME FUNCTION 1 GND Ground 2 DIN Serial-Data Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge. 3 CLK Serial-Clock Input. Data is loaded into the internal 16-bit shift register on CLK’s rising edge. 4 LE 5–20 OUT0–OUT15 Load-Enable Input. Data is loaded transparently from the internal shift register(s) to the output latch(es) while LE is high.
PAGE 7
16-Port, 5.5V Constant-Current LED Driver The MAX6969 LED driver comprises a 4-wire serial interface driving 16 constant-current-sinking, opendrain output ports. The outputs drive LEDs in either static or multiplex applications (Figure 1). The constantcurrent outputs are guaranteed for current accuracy not only with chip-supply voltage variations (5V ±10% and 3V to 5.5V), but also over a realistic range of driver output voltage drop (0.5V to 2.5V).
PAGE 8
MAX6969 16-Port, 5.5V Constant-Current LED Driver CLK is the serial-clock input, which shifts data at DIN into the MAX6969 16-bit shift register on its rising edge. LE LE is the latch load input of the MAX6969 that transfers data from the MAX6969 16-bit shift register to its 16-bit latch when LE is high (transparent latch), and latches the data on the falling edge of LE (Figure 2). The fourth input provides output-enable control of the output drivers.
PAGE 9
16-Port, 5.5V Constant-Current LED Driver Selecting External Component RSET to Set LED Output Current The MAX6969 uses an external resistor, RSET, to set the LED current for outputs OUT0–OUT15. The minimum allowed value of RSET is 327.3Ω, which sets the output currents to 55mA. The maximum allowed value of RSET is 1.5kΩ. The reference value, 360Ω, sets the output currents to 50mA. To set a different output current, use the formula: RSET = 18,000 / IOUT where IOUT is the desired output current in mA.
PAGE 10
16-Port, 5.5V Constant-Current LED Driver MAX6969 Selector Guide NO. OF OUTPUTS PART MAX OUTPUT VOLTAGE (V) MAX OUTPUT CURRENT MAX6968 8 MAX6977 5.5 LED FAULT DETECTION WATCHDOG — — Yes — MAX6978 Yes Yes MAX6970 — — 8 MAX6981 36 MAX6980 55mA MAX6969 16 MAX6984 5.
PAGE 11
16-Port, 5.5V Constant-Current LED Driver PROCESS: BiCMOS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 12
MAX6969 16-Port, 5.5V Constant-Current LED Driver Revision History REVISION NUMBER REVISION DATE 3 6/10 DESCRIPTION Updated Ordering Information, Absolute Maximum Ratings, Electrical Characteristics, and Table 1 PAGES CHANGED 1, 2, 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.