Combining logic gates and high-current bipolar outputs, the
UDN2544B quad Darlington power driver provides an interface be-
tween low-level logic circuitry and high-power loads. Each of the four
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 loads. They feature a minimum breakdown and
sustaining voltage of 50 V. The logic inputs are compatible with TTL
and 5 V CMOS logic systems.
This device is particularly well-suited for unipolar stepper motor
drive applications. With complementary control inputs and an active-
low ENABLE, the UDN2544B makes it easy to implement full stepping
of a stepper motor with only two microcontroller/microprocessor control
lines. Other typical applications include relay or solenoid driving and
incandescent or LED lamp driving.
The UDN2544B is supplied in a 16-pin batwing power DIP. The
batwing construction provides for maximum package power dissipation
in a standard DIP construction. At 25°C, and with only 1 sq. in. of
copper foil at the ground tabs, the package is capable of safely dissi-
pating 3.8 W.
QUAD DARLINGTON
POWER DRIVER
FEATURES
a73 1.8 A Continuous Output Current
a73 Output Voltage to 50 V
a73 Inputs Configured for Unipolar Stepper Motors
a73 Active-Low Output Enable
a73 TTL and 5 V CMOS Compatible Inputs
a73 Integral Transient-Suppression Diodes
Always order by complete part number: UDN2544B .
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
2544
Data Sheet
29317.6*
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-017A
IN4
IN
3
IN
2