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.
FEATURES
a73 1.8 A Continuous Output Current
a73 Output Voltage to 50 V
a73 TTL and 5 V CMOS Compatible Inputs
a73 Efficient Input/Output Pinning
a73 Integral Transient-Suppression Diodes
a73 Replaces L6221A and L6221CD
Data Sheet
29317C
UDN2540B
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
1
2
3 14
4
5
6
7
8 9
10
11
12
13
15
16
ENABLE
GROUND
GROUND
OUT
2
K

GROUND

GROUND
OUT
3
OUT
4
K
OUT
1
V
CC
IN
1
Dwg. PP-017-2
IN
4
IN
3
IN
2
Always order by complete part number:
Part Number Package
UDN2540B 16-pin batwing DIP
A2540SLB 20-lead batwing SOIC
2540