MAX6970AAE+ Maxim Integrated Products, MAX6970AAE+ Datasheet

IC LED DRIVER LINEAR 16-SSOP

MAX6970AAE+

Manufacturer Part Number
MAX6970AAE+
Description
IC LED DRIVER LINEAR 16-SSOP
Manufacturer
Maxim Integrated Products
Type
Linear (Serial Interface)r
Datasheet

Specifications of MAX6970AAE+

Constant Current
Yes
Topology
8-Bit Shift Register, Open Drain, PWM
Number Of Outputs
8
Internal Driver
Yes
Type - Primary
General Purpose
Voltage - Supply
3 V ~ 5.5 V
Voltage - Output
36V
Mounting Type
Surface Mount
Package / Case
16-SSOP
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
55mA
Internal Switch(s)
No
Number Of Segments
16
Low Level Output Current
60 mA
Operating Supply Voltage
3 V to 5.5 V
Maximum Supply Current
30 mA
Maximum Power Dissipation
571 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Efficiency
-
Lead Free Status / Rohs Status
 Details
The MAX6970 serial-interfaced LED driver provides
eight open-drain, constant-current-sinking LED driver
outputs rated at 36V. The device operates from a 3V to
5.5V supply. The MAX6970 supply and the LEDs’ sup-
ply can power up in any order. The constant-current
outputs are programmed together up to 55mA using a
single external resistor. The MAX6970 operates with a
25Mbps, industry-standard, 4-wire serial interface.
The MAX6970 uses the industry-standard shift-register-
plus-latch-type serial interface. The driver accepts data
shifted into an 8-bit shift register using data input DIN
and clock input CLK. Input data appears at output
DOUT eight clock cycles later to allow cascading of
multiple MAX6970s. The latch-enable input, LE, loads
the 8 bits of shift register data into an 8-bit output latch
to set which LEDs are on and which are off. The output-
enable input, OE, gates all eight 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 MAX6981 data sheet that automatically detects
open-circuit LEDs.
For safety-related applications requiring a watchdog
timer, refer to the MAX6980 data sheet, which includes
a fail-safe feature that blanks the display if the serial
interface becomes inactive for more than 1s.
The MAX6970 is one of a family of 10 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.
19-3890; Rev 0; 10/05
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.
Variable Message Signs
Marquee Displays
Point-of-Order Signs
Traffic Signs
Gaming Features
Architectural Lighting
________________________________________________________________ Maxim Integrated Products
8-Port, 36V Constant-Current LED Driver
General Description
Applications
♦ 25Mbps Industry-Standard 4-Wire Serial Interface
♦ 3V to 5.5V Logic Supply
♦ Eight 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
♦ -40°C to +125°C Temperature Range
*EP = Exposed pad.
Typical Application Circuit and Selector Guide appear at
end of data sheet.
MAX6970AUE
MAX6970AAE
at 5V
TOP VIEW
PART
OUT0
OUT1
OUT2
OUT3
GND
CLK
DIN
-40°C to +125°C
-40°C to +125°C
LE
TEMP RANGE
1
2
6
3
4
5
7
8
Ordering Information
TSSOP/SSOP
MAX6970
Pin Configuration
PIN-
PACKAGE
16 TSSOP-EP* U16E-3
16 SSOP
16
15
14
13
12
11
10
9
V+
SET
DOUT
OE
OUT7
OUT6
OUT5
OUT4
Features
PKG
CODE
P16-1
1

Related parts for MAX6970AAE+

MAX6970AAE+ Summary of contents

Page 1

... Marquee Displays Point-of-Order Signs Traffic Signs Gaming Features Architectural Lighting ________________________________________________________________ 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. ♦ 25Mbps Industry-Standard 4-Wire Serial Interface at 5V ♦ 5.5V Logic Supply ♦ ...

Page 2

Constant-Current LED Driver ABSOLUTE MAXIMUM RATINGS (Voltage with respect to GND.) V+ ............................................................................-0.3V to +6V OUT_ .....................................................................-0.3V to +40V DIN, CLK, LE, OE, SET ................................-0.3V to (V+ + 0.3V) DOUT Current ..................................................................±10mA OUT_ Sink Current .............................................................60mA Total GND ...

Page 3

Constant-Current LED Driver 5V TIMING CHARACTERISTICS (Typical Operating Circuit 4.5V to 5.5V, T PARAMETER SYMBOL CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay t DOUT Rise ...

Page 4

Constant-Current LED Driver 3.3V TIMING CHARACTERISTICS (Typical Operating Circuit 5.5V, T PARAMETER CLK Clock Period CLK Pulse-Width High CLK Pulse-Width Low DIN Setup Time DIN Hold Time DOUT Propagation Delay DOUT Rise and Fall ...

Page 5

Constant-Current LED Driver (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. SUPPLY VOLTAGE (INTERFACE IDLE, ALL OUTPUTS ON 360Ω) SET +125° +85° ...

Page 6

Constant-Current LED Driver PIN NAME 1 GND Ground 2 DIN Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK’s rising edge. 3 CLK Serial-Clock Input. Data is loaded into the internal 8-bit shift register ...

Page 7

Constant-Current LED Driver CLK DIN OUT0 Figure 1. Block Diagram LE CLK DIN DOUT OE OUT_ Figure 2. 4-Wire Serial-Interface Timing Diagram _______________________________________________________________________________________ SERIAL-TO-PARALLEL SHIFT REGISTER D7 LATCHES D7 CONSTANT-CURRENT SINKS D7 OUT2 ...

Page 8

Constant-Current LED Driver LE t LRF OUT_ LE t LRR OUT_ CLK t CRF OUT_ CLK t CRR OUT_ Figure 3. LE and CLK to OUT_ Timing Applications Information Selecting External Component R LED Output Current The MAX6970 ...

Page 9

Constant-Current LED Driver Table 1. 4-Wire Serial-Interface Truth Table SHIFT-REGISTER SERIAL- CLOCK CONTENTS DATA INPUT INPUT … DIN CLK … ...

Page 10

Constant-Current LED Driver +5V μC SCLK MOSI MISO LOAD ENABLE 360Ω 10 ______________________________________________________________________________________ MAX6970 V+ OUT0 CLK OUT1 OUT2 DIN OUT3 OUT4 DOUT OUT5 OUT6 LE OUT7 OE SET GND Typical Application Circuit +36V ...

Page 11

Constant-Current LED Driver (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, TSSOP, 4.40 MM BODY, EXPOSED ...

Page 12

... 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products ...

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