A6282
16-Channel Constant-Current LED Driver
Features and Benefits
16 constant-current outputs, up to 50 mA each
LED output voltage up to 12 V
3.0 to 5.5 V logic supply range
Schmitt trigger inputs for improved noise immunity
Power-On Reset (POR), all register bits = 0
Low-power CMOS logic and latches
High data input rate: 30 MHz
Output current accuracy: between channels < ±3% and
between ICs ±7%, over the full operating temperature
range
▪
Internal UVLO and thermal shutdown (TSD) circuitry
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▪
▪
▪
▪
▪
▪
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Description
The A6282 device is designed for LED display applications. This
CMOS device includes an input shift register, accompanying
data latches, and 16 MOS constant current sink drivers.
The CMOS shift registers and latches allow direct interfacing
with microprocessor-based systems. With a 3.3 or 5 V logic
supply, typical serial data input rates can reach up to 30 MHz.
The LED drive current level can be set by a single external
resistor, selected by the application designer. A serial data
output permits cascading of multiple devices in applications
requiring additional drive lines.
The A6282 is available in two 24-terminal packages: QFN
(package ES) and TSSOP (LP), which have an exposed
thermal pad. Both packages are lead (Pb) free with 100% matte
tin leadframe plating.
Applications include the following:
▪
Monocolor, multicolor, or full-color LED display
▪
Monocolor, multicolor, or full-color LED signboard
▪
Display backlighting
▪
Multicolor LED lighting
Packages:
24-pin TSSOP
with exposed thermal pad
(Package LP)
Not to scale
24-contact QFN
4 mm × 4 mm × 0.75 mm
(Package ES)
Typical Application
V
LED
10
μF
OUT0
OUT15
OUT0
OUT15
10
μF
SDI
Controller
CLK
LE
OE
SDI
CLK
LE
OE
SDO
VDD
V
DD
100 nF
GND
REXT
SDI
CLK
LE
OE
SDO
VDD
V
DD
100 nF
GND
REXT
A6282
A6282
IC 1
IC 2
Cascaded A6282 devices
6282-DS, Rev. 4
A6282
Selection Guide
Part Number
A6282EESTR-T
A6282ELPTR-T
Package
16-Channel Constant-Current LED Driver
Packing
1500 pieces per 7-in. reel
4000 pieces per 13 in. reel
4 mm × 4 mm QFN, 24 pins, exposed thermal pad
TSSOP, 24 pins, exposed thermal pad
Absolute Maximum Ratings
Characteristic
Supply Voltage*
OUTx Current (any single output)
Input Voltage Range*
LED Load Supply Range*
ESD Rating
Operating Temperature Range (E)
Junction Temperature
Storage Temperature Range
*With respect to ground.
T
A
T
J
(max)
T
stg
Symbol
V
DD
I
O
V
I
V
LED
HBM (JEDEC JESD22-A114, Human Body Model)
CDM (JEDEC JESD22-C101, Charged Device Model)
V
OE
, V
LE
, V
CLK
, V
SDI
Notes
Rating
–0.3 to 5.5
60
–0.3 to V
DD
+ 0.3
–0.3 to 13.2
2.0
1.0
–40 to 85
150
–55 to 150
Unit
V
mA
V
V
kV
kV
°C
°C
°C
Thermal Characteristics
Characteristic
Package Thermal Resistance
Symbol
R
θJA
Test Conditions
1
ES package, 4-layer PCB based on JEDEC standard
LP packge, 4-layer PCB based on JEDEC standard
Value
37
28
Units
°C/W
°C/W
*Additional thermal information available on the Allegro website.
5.0
Allowable Package Power Dissipation (W)
4.0
Pa
ck
ag
e
Pa
ck
ag
3.0
LP
,R
JA
eE
=
S,
28
R
°C
2.0
JA
/W
=3
7°
C/
W
1.0
0
25
50
75
100
125
Ambient Temperature (°C)
150
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A6282
16-Channel Constant-Current LED Driver
Functional Block Diagram
VDD
SDI
CLK
OE
LE
UVLO and TSD
Serial - Parallel Shift Register
SDO
Control Logic
Block
Latches
Output Control Drivers
REXT
I
O
Regulator
Exposed Pad
(ET and LP packages)
OUT15
GND OUT0 OUT1
V
LED
Inputs and Outputs Equivalent Circuits
Resistor values are equivalent resistance and not tested
VDD
CLK, SDI,
¯¯¯
LE, O E
500
Ω
10
Ω
VDD
SDO
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A6282
16-Channel Constant-Current LED Driver
Pin-out Diagrams
Top-down views
23 OUT15
22 OUT14
21 OUT13
20 OUT12
19 OUT11
24 OE
GND 1
SDI 2
CLK 3
18 OUT10
17 OUT9
24 VDD
23 REXT
22 SDO
21 OE
20 OUT15
PAD
19 OUT14
18 OUT13
17 OUT12
16 OUT11
15 OUT10
14 OUT9
13 OUT8
SDO
REXT
VDD
GND
SDI
CLK
1
2
3
4
5
6
OUT2 10
OUT4 12
OUT3 11
PAD
LE 4
OUT0 5
OUT1 6
OUT2 7
OUT3 8
OUT4 9
OUT5 10
OUT6 11
OUT7 12
16 OUT8
15 OUT7
14 OUT6
13 OUT5
7
8
OUT0
ES Package
OUT1
LE
9
LP Package
Terminal List Table
Name
CLK
GND
LE
¯¯
¯¯
OE
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT15
PAD
REXT
SDI
SDO
VDD
Number
ES
LP
6
3
4
1
7
4
24
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
–
2
5
1
3
21
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
–
23
2
22
24
Description
Clock; data shift clock input terminal
Logic supply ground and load supply ground
Latch Enable input terminal
Output Enable input terminal, active low (when ¯ ¯ = high, all OUTx outputs are forced off; when ¯ ¯ = low,
¯¯
¯¯
OE
OE
on/off status of OUTx outputs is controlled by the state of the latches
Constant current outputs
Exposed pad for enhanced thermal dissipation; not connected internally, connect to GND
Reference current terminal; sets output current for all channels
Serial Data In terminal
Serial Data Out terminal
Logic Supply terminal
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A6282
16-Channel Constant-Current LED Driver
ELECTRICAL CHARACTERISTICS
at T
A1
= 25°C, V
DD
= 3.0 to 5.5 V, unless otherwise noted
Characteristic
Logic Supply Voltage Range
LED Load Supply Output Voltage
Undervoltage Lockout
Symbol
Test Conditions
Operating
V
DD
V
LED
Operating
V
DD
0
→
5.0 V
V
DD(UV)
V
DD
5
→
0.0 V
V
DD
= 4.5 to 5.5 V, V
DS(x)
= 1 V,
R
EXT
= 374
V
DD
= 3.0 to 3.6 V, V
DS(x)
= 1 V,
R
EXT
= 374
I
O
V
DD
= 4.5 to 5.5 V, V
DS(x)
= 1 V,
R
EXT
= 910
V
DD
= 3.0 to 3.6 V, V
DS(x)
= 1 V,
R
EXT
= 910
V
DD
= 5.5 V, V
DS(x)
= 1 V, R
EXT
= 910
Ω,
%∆I
O
T
A
= 25°C; between one output on and
all outputs on
V
DS
= 1 V, R
EXT
= 374
,
all outputs on
Err
V
DS
= 1 V, R
EXT
= 910
,
all outputs on
V
DD
= 5.5 V, V
DS(x)
= 1 to 3 V,
R
EXT
= 374
,
all outputs on
V
DD
= 5.5 V, V
DS(x)
= 1 to 3 V,
R
EXT
= 910
,
all outputs on
%I
O(reg)
V
DD
= 3.6 V, V
DS(x)
= 1 to 3 V,
R
EXT
= 374
,
all outputs on
V
DD
= 3.6 V, V
DS(x)
= 1 to 3 V,
R
EXT
= 910
,
all outputs on
I
DSS
V
OH
= 12 V
V
IH
V
IL
V
Ihys
All digital inputs
I
I
All digital inputs
V
OL
I
OL
= 1 mA
V
OH
I
OH
= –1 mA
R
EXT
= 3.8 k, V
OE
= 5 V
I
DD(OFF)
R
EXT
= 910
,
V
OE
= 5 V
R
EXT
= 374
,
V
OE
= 5 V
All outputs on, R
EXT
= 910
,
V
O
= 1 V,
data transfer 30 MHz
I
DD(ON)
All outputs on, R
EXT
= 374
,
V
O
= 1 V,
data transfer 30 MHz
Min.
3.0
–
2.5
2.3
47.4
46.5
19.8
19.5
–
–
–
–
–
–
–
–
0.8×V
DD
GND
250
–1
–
V
DD
– 0.5
–
–
–
–
–
Typ.
2
5.0
–
2.7
2.5
51.1
50.1
21.4
21.0
–
+1.0
+1.0
1.7
2.4
1.2
1.8
–
–
–
–
–
–
–
–
–
–
–
–
Max.
5.5
12.0
2.9
2.7
54.5
53.5
22.8
22.4
±1
+3.0
+3.0
3
4
2
3
0.5
V
DD
0.2×V
DD
900
1
0.5
–
6
16
40
20
45
Unit
V
V
V
V
mA
mA
mA
mA
%
%
%
%/V
%/V
%/V
%/V
μA
V
V
mV
μA
V
V
mA
mA
mA
mA
mA
Output Current
Output Current Shift
Output to Output Matching Error
3
Output Current Regulation
Output Leakage Current
Logic Input Voltage
Logic Input Voltage Hysteresis
Logic Input Current
SDO Voltage
Supply Current
4
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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