2540
UDN2540B
OUT
4
K
OUT
3
GROUND
GROUND
OUT
2
K
OUT
1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN
4
IN
3
ENABLE
GROUND
GROUND
V
CC
IN
2
IN
1
QUAD DARLINGTON
POWER DRIVER
Combining AND logic gates and inverting high-current bipolar
outputs, the UDN2540B and A2540SLB quad Darlington power drivers
provide interface between low-level signal-processing circuits and
power loads totaling 360 W. Each of the four independent outputs can
sink up to 1.8 A in the on state with peak inrush currents to 2.5 A. The
four power outputs are each comprised of an open-collector Darlington
driver and an internal flyback/clamp diode for switching inductive
leads. They feature a minimum breakdown and sustaining voltage of
50 V. The logic inputs are compatible with TTL and 5 V CMOS logic
systems.
Typical applications include print heads, relays, solenoids, and
dc stepping motors. These drivers can also be used to drive high-
current incandescent lamps, LEDS, and heaters. A similar device,
specifically intended for driving a unipolar stepper motor in the
two-phase drive format, is the UDN2544B.
The UDN2540B is supplied in a 16-pin batwing power DIP; the
A2540SLB is supplied in a 20-lead batwing power SOIC for surface-
mount applications. The batwing construction provides for maximum
package power dissipation in a standard construction. At 25°C, and
with only 1 sq. in. of copper foil at the ground tabs, either package is
capable of safely dissipating more than 2 W.
Data Sheet
29317C
Dwg. PP-017-2
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25°C
Output Voltage, V
OUT
...........................
50 V
Output Current, I
OUT
(peak) ................
2.5 A
(continuous) ..................................
1.8 A
Logic Supply Voltage, V
CC
..................
7.0 V
Input Voltage, V
IN
................................
7.0 V
Package Power Dissipation,
P
D
........................................
See Graph
Operating Temperature Range,
T
A
..................................
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
................................
-55
°
C to +150
°
C
FEATURES
I
I
I
I
I
I
1.8 A Continuous Output Current
Output Voltage to 50 V
TTL and 5 V CMOS Compatible Inputs
Efficient Input/Output Pinning
Integral Transient-Suppression Diodes
Replaces L6221A and L6221CD
Always order by complete part number:
Part Number
Package
UDN2540B
16-pin batwing DIP
A2540SLB
20-lead batwing SOIC
2540
QUAD DARLINGTON
POWER DRIVER
A2540SLB
OUT
4
K
NO
CONNECTION
OUT
3
GROUND
GROUND
OUT
2
NO
CONNECTION
K
OUT
1
1
2
3
4
5
6
7
8
9
10
NC
V
CC
NC
NC
NC
20
19
18
17
16
15
14
13
12
11
IN
4
IN
3
NO
CONNECTION
ENABLE
GROUND
GROUND
SUPPLY
NO
CONNECTION
IN
2
IN
1
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
5
R
θJT
= 6.0°C/W
4
3
SUFFIX 'B', R
θJA
= 43°C/W
2
1
SUFFIX 'LB', R
θJA
= 60°C/W
0
25
50
75
100
TEMPERATURE IN
°C
125
150
Dwg. GP-049-3
Dwg. PP-017-3
TRUTH TABLE
ENABLE
H
—
L
X = Don’t care.
IN
N
H
L
X
OUT
N
ON
OFF
OFF
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1986, 1996 Allegro MicroSystems, Inc.
2540
QUAD DARLINGTON
POWER DRIVER
ELECTRICAL CHARACTERISTICS at T
A
= 25
°
C, T
J
≤
150
°
C, V
CC
= 4.75 V to 5.25 V.
Limits
Characteristic
Output Leakage Current
Symbol
I
CEX
Test Conditions
V
OUT
= 50 V, V
IN
= 0.8 V, V
EN
= 2.4 V
V
OUT
= 50 V, V
IN
= 2.4 V, V
EN
= 0.8 V
Output Sustaining Voltage
Output Saturation Voltage
V
CE(sus)
V
CE(SAT)
I
OUT
= 1.8 A, L = 3.0 mH
I
OUT
= 600 mA, V
IN
= V
EN
= 2.4 V
I
OUT
= 1.0 A, V
IN
= V
EN
= 2.4 V
I
OUT
= 1.8 A, V
IN
= V
EN
= 2.4 V
Input Voltage
Logic 1
Logic 0
Input Current
Logic 1
Logic 0
Total Supply Current
I
CC
V
IN(1)
or V
EN(1)
V
lN(0)
or V
EN(0)
V
IN(1)
or V
EN(1)
= 2.4 V
V
lN(0)
or V
EN(0)
= 0.8 V
V
IN
* = V
EN
= 2.4 V, V
CC
= 5.0 V,
Outputs Open
V
IN
* = V
EN
= 0.8 V, V
CC
= 5.0 V
Clamp Diode Forward Voltage
V
F
I
F
= 1.0 A
I
F
= 1.8 A
Clamp Diode Leakage Current
I
R
V
R
= 50 V
—
—
—
—
0.4
1.3
1.6
<1.0
2.0
1.6
2.0
100
mA
V
V
µA
Min.
—
—
50
—
—
—
2.4
—
—
—
—
Typ.
<1.0
<1.0
—
0.9
1.0
1.3
—
—
—
—
14
Max.
100
100
—
1.0
1.2
1.6
—
0.8
10
-100
20
Units
µA
µA
V
V
V
V
V
V
µA
µA
mA
Typical Data is for design information only.
Negative current is defined as coming out of (sourcing) the specified terminal.
As used here, -100 is defined as greater than +10 (absolute magnitude convention) and the minimum is implicitly zero.
*All inputs simultaneously, all other tests are performed with each input tested separately.
www.allegromicro.com
2540
QUAD DARLINGTON
POWER DRIVER
TYPICAL APPLICATION
(QUAD RELAY DRIVER WITH ZENER FLYBACK)
+28 V
1
2
3
4
K
2
15V
5
6
7
8
16
15
14
13
12
11
10
9
+5V
IN
2
IN
1
Dwg. EP-016
K
4
K
3
IN
4
IN
3
ENABLE
K
1
APPLICATIONS INFORMATION
A typical application is shown for driving four high-current relays,
solenoids, or print heads. A Zener diode is used to increase the
flyback voltage, providing a much faster inductive load turn-off current
decay, resulting in faster dropout (reduced relay contact arcing), and
improved performance. The maximum Zener voltage, plus the load
supply voltage, plus the flyback diode forward voltage must not exceed
the device’s rated sustaining voltage.
With external control circuitry, the ENABLE input can be used for
chopper (PWM) applications. If the ENABLE input is not used, it
should be tied high.
All inputs will float high if open circuited.
V
CC
+ V
Z
+ V
F
OUTPUT
VOLTAGE
V
CC
V
CC
+ V
F
V
CE(SAT)
I
OUT
ZENER CLAMP
DIODE CLAMP
OUTPUT
CURRENT
I
CEX
Dwg. WP-001
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2540
QUAD DARLINGTON
POWER DRIVER
UDN2540B
Dimensions in Inches
(controlling dimensions)
0.020
0.008
16
NOTE 4
9
0.430
0.280
0.240
MAX
0.300
BSC
1
0.070
0.045
0.100
0.775
0.735
BSC
8
0.005
MIN
0.210
MAX
0.015
MIN
0.150
0.115
0.022
0.014
Dwg. MA-001-17A in
Dimensions in Millimeters
(for reference only)
16
NOTE 4
9
0.508
0.204
10.92
7.11
6.10
MAX
7.62
BSC
1
1.77
1.15
2.54
19.68
18.67
BSC
8
0.13
MIN
5.33
MAX
0.39
MIN
3.81
2.93
0.558
0.356
Dwg. MA-001-17A mm
NOTES: 1. Leads 1, 8, 9, and 16 may be half leads at vendor’s option.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Webbed lead frame. Leads indicated are internally one piece.
5. Exact body and lead configuration at vendor’s option within limits shown.
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