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
Packages:
24-contact QFN
4 mm × 4 mm × 0.75 mm
(Package ES)
24-pin TSSOP
with exposed thermal pad
(Package LP)
24-pin SOIC
(Package LW)
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 a variety of 24-terminal packages:
QFN (package ES) and eTSSOP (LP), which have an exposed
thermal pad, and SOIC (LW). All 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
Not to scale
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. 1
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
