19-3677; Rev 3; 6/10
IT
TION K
VALUA
E
BLE
AVAILA
16-Port, 5.5V Constant-Current LED Driver
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
Ordering Information
PART
MAX6969AUG+
MAX6969AWG+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
24 TSSOP
24 Wide SO
MAX6969ANG+
-40°C to +125°C
24 PDIP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Application Circuit and Selector Guide appear at
end of data sheet.
Pin Configuration
TOP VIEW
GND 1
DIN 2
24 V+
23 SET
22 DOUT
21 OE
Applications
Variable Message Signs
Marquee Displays
Point-of-Order Signs
Traffic Signs
Gaming Features
Architectural Lighting
CLK 3
LE 4
OUT0 5
OUT1 6
OUT2 7
OUT3 8
OUT4 9
OUT5 10
MAX6969AUG
MAX6969ANG
MAX6969AWG
20 OUT15
19 OUT14
18 OUT13
17 OUT12
16 OUT11
15 OUT10
14 OUT9
13 OUT8
*Future product—contact factory for availability.
OUT6 11
OUT7 12
TSSOP/PDIP/SO
________________________________________________________________
Maxim Integrated Products
1
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.
16-Port, 5.5V Constant-Current LED Driver
MAX6969
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 .............................................................60mA
Total GND Current ...........................................................480mA
Continuous Power Dissipation (T
A
= +70°C)
24-Pin TSSOP (derate 12.2mW/°C over +70°C) ..........975mW
24-Pin PDIP (derate 13.3mW/°C over +70°C)............1067mW
24 Wide SO (derate 11.8mW/°C over +70°C)..............941mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Typical
Application Circuit,
V+ = 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 5V, T
A
= +25°C.)
(Note 1)
PARAMETER
Operating Supply Voltage
Output Voltage
Standby Current
(Interface Idle, All Output Ports
High Impedance, R
SET
= 360Ω)
Standby Current
(Interface Running, All Output
Ports High Impedance,
R
SET
= 360Ω)
Supply Current
(Interface Idle, All Output Ports
Active Low, R
SET
= 360Ω)
Input High Voltage
DIN, CLK, LE,
OE
Input Low Voltage
DIN, CLK, LE,
OE
Hysteresis Voltage
DIN, CLK, LE,
OE
Input Leakage Current
DIN, CLK, LE,
OE
Output High-Voltage DOUT
Output Low Voltage
Output Current OUT_
Output Leakage Current OUT_
SYMBOL
V+
V
OUT
I
+
All logic inputs at V+ or GND, DOUT
unloaded
5.7
CONDITIONS
MIN
3.0
TYP
MAX
5.5
5.5
8
UNITS
V
V
mA
I
+
f
CLK
= 5MHz,
OE
= V+, DIN and LE = V+
or GND, DOUT unloaded
6
8.5
mA
I
+
All logic inputs at V+ or GND,
DOUT unloaded
0.7 x
V+
18
25
mA
V
IH
V
IL
∆V
I
I
IH
, I
IL
V
OH
V
OL
I
OUT
I
LEAK
I
SOURCE
= 4mA
I
SINK
= 4mA
V+ = 3V to 5.5V, V
OUT
= 0.5V to 2.5V,
R
SET
= 360Ω
OE
= V+, OUT_ = V+
V
0.3 x
V+
0.8
V
V
+1
µA
V
0.5
V
mA
µA
-1
V+
- 0.5V
37
50
61
1
2
_______________________________________________________________________________________
16-Port, 5.5V Constant-Current LED Driver
5V TIMING CHARACTERISTICS
(Typical
Application Circuit,
V+ = 4.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
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 Time
LE Pulse-Width High
LE Setup Time
LE Rising to OUT_ Rising Delay
LE Rising to OUT_ Falling Delay
CLK Rising to OUT_ Rising Delay
CLK Rising to OUT_ Falling Delay
OE
Rising to OUT_ Rising Delay
OE
Falling to OUT_ Falling Delay
LED Output OUT_ Turn-On Fall
Time
LED Output OUT_ Turn-Off Rise
Time
SYMBOL
t
CP
t
CH
t
CL
t
DS
t
DH
t
DO
t
DR,
t
DF
t
LW
t
LS
t
LRR
t
LRF
t
CRR
t
CRF
t
OEH
t
OEL
t
f
t
r
80% to 20%, pullup resistor = 65Ω
20% to 80%, pullup resistor = 65Ω
C
DOUT
= 10pF, 20% to 80%
20
10
100
300
100
310
100
320
120
120
CONDITIONS
MIN
40
19
19
4
8
12
32
10
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MAX6969
_______________________________________________________________________________________
3
16-Port, 5.5V Constant-Current LED Driver
MAX6969
3.3V TIMING CHARACTERISTICS
(Typical
Application Circuit,
V+ = 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
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 Time
LE Pulse-Width High
LE Setup Time
LE Rising to OUT_ Rising Delay
LE Rising to OUT_ Falling Delay
CLK Rising to OUT_ Rising Delay
CLK Rising to OUT_ Falling Delay
OE
Rising to OUT_ Rising Delay
OE
Falling to OUT_ Falling Delay
LED Output OUT_ Turn-On Fall
Time
LED Output OUT_ Turn-Off Rise
Time
SYMBOL
t
CP
t
CH
t
CL
t
DS
t
DH
t
DO
t
DR,
t
DF
t
LW
t
LS
t
LRR
t
LRF
t
CRR
t
CRF
t
OEH
t
OEL
t
f
t
r
80% to 20%, pullup resistor = 65Ω
20% to 80%, pullup resistor = 65Ω
C
DOUT
= 10pF, 20% to 80%
20
15
120
310
120
330
120
330
120
120
CONDITIONS
MIN
52
24
24
4
8
12
50
12
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
See Figure 3.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF,
R
SET
= 720Ω)
MAX6969 toc01
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS
OFF, R
SET
= 360Ω)
MAX6969 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS ON, R
SET
= 720Ω)
T
A
= +125°C
18
SUPPLY CURRENT (mA)
16
14
12
10
T
A
= -40°C
8
6
T
A
= +25°C
T
A
= +85°C
MAX6969 toc03
4.50
4.25
SUPPLY CURRENT (mA)
4.00
3.75
3.50
3.25
3.00
2.75
2.50
6.0
5.8
5.6
SUPPLY CURRENT (mA)
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
T
A
= -40°C
T
A
= +25°C
T
A
= +125°C
T
A
= +85°C
20
T
A
= +125°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
16-Port, 5.5V Constant-Current LED Driver
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS ON, R
SET
= 360Ω)
T
A
= +125°C
T
A
= +85°C
MAX6969 toc04
MAX6969
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (R
SET
= 720Ω, V+ = 3.3V)
MAX6969 toc05
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (R
SET
= 360Ω, V+ = 3.3V)
MAX6969 toc06
22
20
SUPPLY CURRENT (mA)
18
16
14
12
T
A
= -40°C
10
3.0
3.5
4.0
4.5
5.0
T
A
= +25°C
30
25
T
A
= -40°C
20
15
10
5
0
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
60
50
40
30
20
10
0
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
PORT OUTPUT CURRENT (mA)
5.5
0
0.5
1.0
1.5
2.0
2.5
3.0
PORT OUTPUT CURRENT (mA)
0
0.5
1.0
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
PORT OUTPUT VOLTAGE (V)
PORT OUTPUT VOLTAGE (V)
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (R
SET
= 720Ω, V+ = 5.0V)
MAX6969 toc07
PORT OUTPUT CURRENT vs. PORT OUTPUT
VOLTAGE (R
SET
= 360Ω, V+ = 5.0V)
MAX6969 toc08
PORT OUTPUT CURRENT vs. SUPPLY
VOLTAGE (R
SET
= 720Ω, V
OUT
= 2V)
MAX6969 toc09
30
25
20
15
10
5
0
0
0.5
1.0
1.5
2.0
2.5
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
60
50
T
A
= -40°C
40
30
20
10
0
T
A
= +25°C
T
A
= +85°C
T
A
= +125°C
27.0
26.5
T
A
= -40°C
26.0
25.5
T
A
= +85°C
25.0
24.5
24.0
T
A
= +125°C
T
A
= +25°C
PORT OUTPUT CURRENT (mA)
PORT OUTPUT CURRENT (mA)
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
PORT OUTPUT CURRENT (mA)
3.0
3.5
4.0
4.5
5.0
5.5
PORT OUTPUT VOLTAGE (V)
PORT OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
PORT OUTPUT CURRENT vs. SUPPLY
VOLTAGE (R
SET
= 360Ω, V
OUT
= 2V)
MAX6969 toc10
PORT OUTPUT CURRENT
vs. R
SET
RESISTANCE (V+ = 5.0V)
MAX6969 toc11
54
50
PORT OUTPUT CURRENT (mA)
PORT OUTPUT CURRENT (mA)
53
T
A
= -40°C
52
T
A
= +25°C
40
30
51
T
A
= +125°C
T
A
= +85°C
20
50
10
49
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
0
0
300
600
900
1200
1500
R
SET
RESISTANCE (Ω)
_______________________________________________________________________________________
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