Description
Recommended for high-side switching applications that benefit
from separate logic and load grounds, these devices encompass
load supply voltages to 50 V and output currents to -500 mA.
These 8-channel source drivers are useful for interfacing
between low-level logic and high-current loads. Typical loads
include relays, solenoids, lamps, stepper and/or servo motors,
print hammers, and LEDs.
All devices may be used with 5 V logic systems — TTL, Schottky
TTL, DTL, and 5 V CMOS. The device packages offered are
electrically interchangeable, and will withstand a maximum
output off voltage of 50 V, and operate to a minimum of 5 V. All
devices in this series integrate input current limiting resistors
and output transient suppression diodes, and are activated by
an active high input.
The package is a 20-pin wide-body SOIC with improved
thermal characteristics compared to the 18-pin SOIC version
it replaces (100% pin-compatible electrically).
The package is lead (Pb) free, with 100% matte-tin leadframe
plating.
29310U
Features and Benefits
▪ TTL, DTL, PMOS, or CMOS compatible inputs
▪ 500 mA output source current capability
▪ Transient-protected outputs
▪ Output breakdown voltage to 50 V
▪ DIP or SOIC packaging
8-Channel Source Driver
Package: 20-pin SOICW (suffix LW)
Simplified Block Diagram
Not to scale
A2982
(drop-in replacement for discon-
tinued 18-pin SOIC variants)
(NC pins, 10 and 11, not present
on discontinued 18-pin LW package)
8-Channel Source Driver
A2982
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Selection Guide
Part Number Package Packing Ambient Temperature
TA (°C)
A2982SLWTR-T 20-pin SOICW 1000 per reel –20 to 85
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Output Voltage Range VCE 5 to 50 V
Input Voltage VIN 20 V
Output Current IOUT –500 mA
Package Power Dissipation PDSee graph – –
Operating Ambient Temperature TARange S –20 to 85 ºC
Maximum Junction Temperature TJ(max) 150 ºC
Storage Temperature Tstg –55 to 150 ºC
50 75 100 125 150
2.5
0.5
0
ALLOWABLE PACKAGE POWER DISSIPATION (W)
AMBIENT TEMPERATURE C
2.0
1.5
1.0
25
20-LE AD S OIC , R
JA
=90 C/W
8-Channel Source Driver
A2982
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
One of Eight Drivers
1
2
3
4
5
6
7
8
9
13
14
15
16
17
18
19
20
12
10 11
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
V
NC NC
S
RL
RL
RL
RL
RL
RL
RL
RL
Typical electrosensitive
printer application
Pins 10 and 11 can fl oat; other pins
match discontinued 18-pin SOIC: 1 to 9
same, pins 12 to 20 match pins 10 to 18
8-Channel Source Driver
A2982
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS1,2 at TA = +25°C (unless otherwise specifi ed).
1Negative current is defi ned as coming out of (sourcing) the specifi ed device terminal.
2All unused inputs must be connected to ground. Pull-down resistors (approximately 10 kΩ) are recommended for inputs that are al-
lowed to fl oat while power is being applied to VS.
3All inputs simultaneously.
4Turn-off delay is infl uenced by load conditions. Systems applications well below the specifi ed output loading may require timing con-
siderations for some designs, i.e., multiplexed displays or when used in combination with sink drivers in a totem pole confi guration.
Characteristic Symbol Test Conditions Test Fig. Min. Typ. Max. Units
Output Leakage Current3ICEX VIN = 0.4 V, VS = 50 V 1 — — 20 μA
Output Sustaining Voltage VCE(SUS) IOUT = -45 mA — 35 — — V
Collector-Emitter
Saturation Voltage VCE(SAT)
VIN = 2.4 V, IOUT = -100 mA 2 — 1.6 1.8 V
VIN = 2.4 V, IOUT = -225 mA 2 — 1.7 1.9 V
VIN = 2.4 V, IOUT = -350 mA 2 — 1.8 2.0 V
Input Current IIN(ON)
VIN = 2.4 V 3 — 140 200 μA
VIN = 12 V 3 — 1.25 1.93 mA
Output Source Current
(Outputs Open) lOUT VIN = 2.4 V, VCE = 2.0 V 2 -350 — — mA
Supply Current Leakage
Current ISVIN = 2.4 V*, VS = 50 V 4 — — 10 mA
Clamp Diode Current IRVR = 50 V, VIN = 0.4 V* 5 — — 50 μA
Clamp Diode Forward
Voltage VFIF = 350 mA 6 — 1.5 2.0 V
Turn-On Delay tON 0.5 EIN to 0.5 EOUT, RL = 100Ω, VS = 35 V — — 0.3 2.0 μs
Turn-Off Delay4tOFF 0.5 EIN to 0.5 EOUT, RL = 100Ω, VS = 35 V, See Note — — 2.0 10 μs
8-Channel Source Driver
A2982
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
TEST FIGURES
Figure 1 Figure 2 Figure 3
Dwg. No. A-11,083 Dwg. No. A-11,084 Dwg. No. A-11,085
V
VIN
CEX
I
S
μA
V
V
V
IOUT
IN
CE
S
V
mA
OPEN
V
VIN
IN
I
S
mA
Dwg. No. A-11,086 Dwg. No. A-11,087 Dwg. No. A-11,088
Figure 5 Figure 6
Figure 4
OPEN
OPEN
VIF
FV
V
S
IR
VIN
μA
VIN
IS
S
V
OPEN
mA
8-Channel Source Driver
A2982
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Allowable peak collector current
as a function of duty cycle
100
V = 15 V
8
76
4
5
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
90
80
70
60
50
40
30
20
10
0
0
50
100
150
200
250
300
350
400
450
500
RECOMMENDED MAXIMUM OUTPUT CURRENT
ALLOWABLE PEAK COLLECTOR CURRENT IN mA AT 50°C
PER CENT DUTY CYCLE
S
3
100
V = 15 V
8
7
6
4
5
NUMBER OF OUTPUTS
CONDUCTING
SIMULTANEOUSLY
90
80
70
60
50
40
30
20
10
0
0
50
100
150
200
250
300
350
400
450
500
RECOMMENDED MAXIMUM OUTPUT CURRENT
ALLOWABLE PEAK COLLECTOR CURRENT IN mA AT 70°C
PER CENT DUTY CYCLE
S
3
Dwg. No. A-11,107B Dwg. No. A-11,108B
Input current as a function
of input voltage
TYPICAL
2.5
INPUT CURRENT, I (mA)
IN
2.0
1.5
1.0
0.5
246810 12
INPUT VOLTAGE (VOLTS)
MAXIMUM
Dwg. No. A-11,115B
8-Channel Source Driver
A2982
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
LW Package, 20-Pin SOICW
21
20
21
20
A
2.65 MAX
C
SEATING
PLANE
C0.10
20X
ATerminal #1 mark area
GAUGE PLANE
SEATING PLANE B
2.25
0.65
9.50
1.27
PCB Layout Reference View
For Reference Only
Dimensions in millimeters
(Reference JEDEC MS-013 AC)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
BReference pad layout (reference IPC SOIC127P1030X265-20M)
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
1.27
0.25
0.20 ±0.10
0.41 ±0.10
12.80±0.20
10.30±0.33
7.50±0.10
4° ±4
0.27 +0.07
–0.06
0.84 +0.44
–0.43
8-Channel Source Driver
A2982
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Copyright ©1977-2012, Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifi cations as may be required to permit
improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Revision History
Revision Revision Date Description of Revision
Rev. U April 30, 2012 Update product availability