ETC AT1326

AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Features
General Description
• Driver capability and output counts - 90mA×16
Bits
• Power supply voltage range: 4.5V ~ 5.5V,
constant output current range: 5 ~ 90 mA
• Power supply voltage range: 3.3V ~ 4.4V,
constant output current range: 5 ~ 45 mA
• Maximum output terminal voltage: 17V
• Data transfer rate: 25MHz
• Output current adjusted through an external
resistor
• Output current accuracy: All output ON
Supply Voltage
4.5V ~ 5.5V
3.3V ~ 4.4V
The AT1326 is a constant current driver
incorporating shift register and data latch. The
output constant current can be set using an external
resistor. All outputs will have virtually the same
current levels. The device also incorporates
thermal shutdown circuitry which turns constant
current output off when the junction temperature
exceeds the limit.
Current Accuracy
Between Channels
Between ICs
<±3%
<±6%
Output Current
10mA ~ 60mA
10mA ~ 45mA
Block Diagram
OUT0 OUT1 OUT14 OUT15
ENABLE
LATCH
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
1
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
VDD
R-EXT
SDO
ENABLE
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
Pin Configurations
24
23
22
21
20
19
18
17
16
15
14
13
AT1326R
2
3
4
5
6
7
8
9
10
11
12
SDI
LATCH
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
GND
1
CLK
▲▲▲▲▲▲
Ordering Information
Part number
AT1326R_GRE
Package
SSOP24-1.0mm, Green
Marking
▲▲▲▲▲▲
▲▲▲▲▲▲: Date Code
*For more marking information, contact out sales representative directly
Pin Description
Pin NO. Symbol
1
GND
2
SDI
3
CLK
4
LATCH
5 to 20
21
22
23
24
Description
GND terminal for control logic and current sink.
Input terminal for serial data for data shift register.
Input terminal for clock for data shift on rising edge.
Input terminal for data strobe. When the LATCH input is driven High,
data is not latched. When it is pulled Low, data is latched.
OUT0 ~ OUT15 Constant-current output terminals.
Input terminal for output enable.
ENABLE
All outputs ( OUT0 to OUT15 ) are turned off, when the ENABLE
terminal is driven High. And are turned on, when the terminal is driven Low.
SDO
Output terminal for serial data input on SDI terminal
R-EXT
Input terminal used to connect an external resistor. This regulated the output
current.
VDD
3.3V/5V supply voltage terminal.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
2
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Timing Diagram
n = 15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CLK
SDI
LATCH
ENABLE
OFF
OUT0
ON
OFF
OUT1
ON
OFF
OUT2
ON
OFF
ON
OFF
OUT15
ON
SDO
: don' t care
Truth Table
CLK
OUT15 … OUT15 … OUT15
LATCH
ENABLE
SDI
H
L
Dn
L
L
Dn+1
H
L
Dn+2
Dn + 2 ….
Dn - 5 …. Dn - 13
Dn-13
X
L
Dn+3
Dn + 2 ….
Dn - 5 …. Dn - 13
Dn-13
X
H
Dn+3
Dn
….
Dn - 7
….
Dn - 15
No Change
Off
SDO
Dn-15
Dn-14
Dn-13
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
3
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Absolute Maximum Ratings*1
(Ta=+25°C)
Parameter
Supply Voltage
Input Voltage
Output Current
Output Voltage
Power Dissipation (on PCB)*2
Thermal Resistance (on PCB)*2
Operating Temperature
Junction Temperature
Storage Temperature range
Minimum ESD Rating*3
Symbol
VDD
VIN
IOUT
VOUT
Pd
θJA
Topr
Tj
Tstg
HBM
MM
Rated Value
Min.
Max.
-0.5
+6.0
-0.2
VDD+0.2
+90
-0.2
+17.0
1.00
120
-40
+85
+150
-55
+150
2
200
Unit
V
V
mA/ch
V
W
˚C/W
˚C
˚C
˚C
KV
V
1. 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.
2. The Powers dissipation is derated by 6.67mW/°C if device is mounted on PCB and PCB ambient temperature is
above 25°C.
3. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF
capacitor discharged through a 1.5KΩ resistor into each pin.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
4
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Electrical Characteristics
(Ta =+25℃, VDD = 3.3V to 5.5V, unless otherwise noted)
Parameter
Symbol
Max.
5.5
4.4
17.0
-
±1
-
%
-
±2
-
%
5
5
0.7VDD
GND
4.6
-
45.0
±1
22.5
±1
90
45
-1.0
1.0
VDD
0.3VDD
0.5
0.4
±3
±3
mA
mA
V
V
µA
V
V
mA
%
mA
%
-
±0.1
-
%/V
-
±1
-
%/V
-
-
2
mA
250
500
800
KΩ
250
500
800
KΩ
IDD(off) 1 REXT=Open, OUT0 ~ OUT15 =Off
IDD(off) 2 REXT=820Ω, OUT0 ~ OUT15 =Off
-
4.5
-
-
5.5
-
IDD(off) 3 REXT =410Ω, OUT0 ~ OUT15 =Off
IDD(on) 1 REXT =820Ω, OUT0 ~ OUT15 =On
-
7.0
-
-
5.5
-
IDD(on) 2
-
7.0
-
Output Voltage
Reference Voltage
Variation
Reference Voltage
Accuracy
VDS
dVREF
IOUT
H Level
L Level
Output Leakage current
SDO
Output Current 1
Current Skew
Output Current 2
Current Skew
Output Current vs.
Output Voltage Regulation
Output Current vs.
Supply Voltage Regulation
Output Current Variation
One vs. All Output ON
Pull-up Resistor
Pull-down Resistor
Supply
Current
IOUT=5 ~ 90mA
IOUT=5 ~ 45mA
OUT0 ~ OUT15
Ta = - 40~85℃
VREF
Input Voltage
“OFF”
“ON”
Thermal Shutdown
Temperature
Thermal Shutdown
Unit
Typ.
5.0
-
VDD
Output Current
Values
Min.
4.5
3.3
-
Supply Voltage
Output Voltage
Condition
IOH
IOL
VIH
VIL
IOZ
VOL
VOH
IOUT1
dIOUT1
IOUT2
dIOUT2
%/dVDS
DC Test Circuit
VDD=4.5~5.5V
VDD=3.3~4.4V
SDO
SDO
Ta = - 40~85℃
Ta = - 40~85℃
VDS = 17.0V
IOL = +1.0mA
IOH = -1.0mA
VDS=0.6V
REXT=410Ω
IOL=45.0mA
REXT=820Ω
VDS=0.5V
IOL=22.5mA
VDS within 1.0V ~ 3.0V
VDD within 4.5V ~ 5.5V and
3.3V ~ 4.4V
VDD within 3.3 ~ 5.5V,
dIOUT
IOUT within 5mA ~ 60mA
RIN(up) ENABLE
RIN(down) LATCH
%/dVDD
REXT =410Ω, OUT0 ~ OUT15 =On
V
V
mA
mA
TTSD
140
℃
THYS
20
℃
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
5
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Switching Characteristics
(Ta =+25℃, unless otherwise noted. )
Parameter
Symbol
tpLH1
tpLH2
tpLH3
Propagation delay
tpLH
tpHL1
tpHL2
tpHL3
Output Rise Time
Output Fall Time
Maximum CLOCK rise time
Maximum CLOCK fall time
Clock Frequency
LATCH Pulse Width
CLOCK Pulse Width
ENABLE Pulse Width
Set-up Time for CLOCK
Terminal
Hold time for CLOCK
Terminal
Set-up Time for LATCH
Terminal
Condition
CLK- OUTn , LATCH =“H”,
ENABLE =“L”
LATCH - OUTn ,
ENABLE =“L”
ENABLE - OUTn ,
LATCH =“H”
CLK-SERIAL OUT
CLK- OUTn , LATCH =“H”,
ENABLE =“L”
LATCH - OUTn ,
ENABLE =“L”
ENABLE - OUTn ,
LATCH =“H”
CLK-SERIAL OUT
10~90% of voltage waveform
90~10% of voltage waveform
When not on PCB (Note*)
tpHL
tor
tof
tr
tf
fCLK Cascade connected
twLAT
-
Values
Min.
Typ. Max.
Unit
-
80
160
-
80
160
-
50
200
20
25
-
-
60
120
-
60
120
-
60
120
20
20
25
70
50
-
150
150
500
500
25
-
ns
ns
ns
ns
MHz
ns
-
-
ns
ns
ns
ns
twCLK
twENA
tSETUP1
-
20
200
5
THOLD
-
10
-
-
ns
tSETUP2
-
25
-
-
ns
Conditions: (Refer to test circuit.)
Topr = 25°C, VDD = VIH = 3.3 V and 5 V, VOUT = 0.7 V, VIL = 0 V, REXT = 490Ω,
VL = 3.0 V, RL = 60Ω, CL _ 10.5 pF
Note*: If the device is connected in a cascade and tr/tf for the waveform is large, it may not be
possible to achieve the timing required for data transfer. Please consider the timings carefully.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
6
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Test Circuit
IDD
IOUT
VIH, VIL
ENABLE
OUT0
CLK
Function
Generator
RL
OUT15
LATCH
SDI
VIH=5V
VDD
Logic input
waveform
R-EXT
GND
SDO
CL
CL
Iref
VL
VIL=0V
tr = tf = 10ns
Equivalent Circuits of Inputs and Outputs
ENABLE terminal
LATCH terminal
VDD
IN
IN
CLK, SDI terminal
VDD
IN
VDD
SDO terminal
VDD
OUT
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
7
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Timing Waveforms
1. CLK, SDI, SDO
twCLK
CLK
50%
50%
tSETUP1
SDI
50%
50%
tHOLD
SDO
50%
tpLH/tpLH
2. CLK, SDI, LATCH, ENABLE, OUTn
CLK
50%
SDI
tSETUP2
LATCH
50%
50%
twENA
twLAT
50%
ENABLE
50%
50%
OUTn
tpHL1/LH1
tpHL2/LH2
tpHL3/LH3
3. OUTn
90%
90%
OFF
OUTn
10%
tof
10%
ON
tor
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
8
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Application Circuits
Constant Current
The output current is set that have considered the following items
1.
In all channels on, the output current accuracy between channels is less than ±3%, and between ICs
is less than ±6%.
2.
The output current is constant if the VDS is enough, users can refer to the figure as below.
Adjusting Output Current
The output current of each channel is set by an external resistor in R-EXT pin. The relationship
between IOUT and Rext is shown in the following figure.
The output current can be calculated from the equation:
VEXT=0.620V; IOUT = (VEXT / Rext) X 30
Where Rext is the external resistor connected to R-EXT pin and VEXT is the voltage of R-EXT pin.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
9
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
100
90
80
70
60
50
40
30
20
10
0
0
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Load Supply Voltage (VLED)
The AT1326 are designed to operate with the VDS of 0.6V to 0.8V with the LED forward voltage (VF)
of 1.2 to 4.0V. If higher voltages are dropped across the driver, package power dissipation will increase
significantly. It is recommended to use the lowest load supply voltage or to set any serials dropping
voltage (VDROP) as
VDS = VLED – VF –VDROP
The resistors or Zener diode, or a serials string of diodes can be used in the applications as shown in the
following figures.
VLED
VLED
VLED
VDROP
VDROP
VDROP
VF
VF
VF
VDS
VDS
VDS
AT1326
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
10
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Package Outline (units: mm)
SSOP24
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
11
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Reflow Profiles
Profile Feature
Average ramp-up rate
(TL to TP)
Sn-Pb Eutectic Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
<2.5mm or Pkg.
≥2.5mm or Pkg.
3
volume
<350mm3
volume ≥350mm
3°C/second max.
Pb-Free Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
≥2.5mm or Pkg.
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
12
AT1326
Preliminary Product Information
16-bit Constant Current LED Sink Driver
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
Tsmax to TL
-Ramp-up Rate
Time maintained above:
-Temperature (TL)
-Time (tL)
Peak Temperature(TP)
Time within 5°C of actual Peak
Temperature (tP)
Ramp-down Rate
Time 25°C to Peak
Temperature
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
3℃/second max.
183°C
60-150 seconds
217°C
60-150 seconds
225+0/-5°C
10-30 seconds
240+0/-5°C
10-30 seconds
6°C/second max.
6 minutes max.
245+0/-5°C
10-30 seconds
250+0/-5°C
20-40 seconds
3°C/second max.
8 minutes max.
*All temperatures refer to topside of the package, measured on the package body surface.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
9/28/2006 REV: 0.2
Email: service@aimtron.com.tw
13