Page 1
OUT
OUT
GROUND
GROUND
OUT
OUT
Data Sheet
29317.6*
2544
QUAD DARLINGTON
POWER DRIVER
Combining logic gates and high-current bipolar outputs, the
UDN2544B quad Darlington power driver provides an interface between 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
1
4
2
K
3
3
4
5
6
2
7
K
8
1
IN
16
IN
15
ENABLE
14
GROUND
13
12
GROUND
V
11
10
IN
IN
9
Dwg. PP-017A
4
3
CC
2
1
to 2.5 A. The four power outputs are each comprised of an opencollector 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 activelow 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 dissipating 3.8 W.
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
Output Voltage, V
Output Current, I
(Peak) ........................................... 2.5 A
(Continuous) ................................. 1.8 A
Logic Supply Voltage, V
Input Voltage, V
Package Power Dissipation,
P
......................................... See Graph
D
Operating Temperature Range,
T
.................................. -20°C to +85°C
A
Storage Temperature Range,
T
................................ -55°C to +150°C
S
............................. 50 V
OUT
OUT
.................... 7.0 V
CC
.................................. 7.0 V
IN
FEATURES
■ 1.8 A Continuous Output Current
■ Output Voltage to 50 V
■ Inputs Configured for Unipolar Stepper Motors
■ Active-Low Output Enable
■ TTL and 5 V CMOS Compatible Inputs
■ Integral Transient-Suppression Diodes
Always order by complete part number: UDN2544B .
Page 2
2544
QUAD DARLINGTON
POWER DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ ≤ 150°C, VCC = 4.75 V to 5.25 V.
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Leakage Current I
Output Sustaining Voltage V
Output Saturation Voltage V
CEX
CE(sus)
CE(SAT)
Input Voltage Logic 1 V
Logic 0 V
Input Current Logic 1 V
Logic 0 V
Total Supply Current I
CC
V
= 50 V — <1.0 100 µA
OUT
I
= 1.8 A, L = 3.0 mH 50 — — V
OUT
I
= 600 mA — 0.9 1.0 V
OUT
I
= 1.0 A — 1.0 1.2 V
OUT
I
= 1.8 A — 1.3 1.6 V
OUT
IN(1) or VEN(1)
IN(0) or VEN(0)
IN(1) or VEN(1)
IN(0) or VEN(0)
= 2.4 V — — 10 µA
= 0.8 V — — -100 µA
2.4 — — V
— — 0.8 V
All Outputs ON, Outputs Open — 14 20 mA
All Outputs OFF — 0.4 2.0 mA
Clamp Diode Forward Voltage V
Clamp Diode Leakage Current I
F
R
IF = 1.0 A — 1.3 1.6 V
I
= 1.8 A — 1.6 2.0 V
F
VR = 50 V — < 1.0 100 µA
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.
TRUTH TABLE
ENABLE IN1OUT1IN
L H ON H OFF H OFF H ON
L OFF L ON L ON L OFF
H X OFF X OFF X OFF X OFF
X = Don't care
2
OUT2IN
OUT3IN
3
115 Northeast Cutoff, Box 15036
W
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1989, 1995 Allegro MicroSystems, Inc.
4
OUT
4
5
R = 6.0°C/W
4
3
2
R = 43°C/W
θJA
1
0
25
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
50 75 100 125 150
TEMPERATURE IN °C
θJT
Dwg. GP-010B
Page 3
QUAD DARLINGTON
)
TYPICAL APPLICATION
(UNIPOLAR STEPPER MOTOR WITH ZENER FLYBACK)
2544
POWER DRIVER
TRUTH TABLE
INPUTS WINDINGS
1/2 3/4 A B C D
L H ON ON OFF OFF
L L OFF ON ON OFF
H L OFF OFF ON ON
H H ON OFF OFF ON
V + V + V
BB Z F
V + V
BB F
DIODE CLAMP
Dwg. WP-001
OUTPUT
VOLTAGE
OUTPUT
CURRENT
V
BB
V
OUT(SAT
ZENER CLAMP
Dwg. EP-015
APPLICATIONS INFORMATION
A typical application is shown driving a four-phase unipolar stepper
motor. Note that with the complimentary control inputs, only two logic
signals are needed to drive the motor in the two-phase format. The two
phase drive format illustrated, energizes two adjacent phases in each
detent position (AB, BC, CD, DA) to provide an improved torque-speed
product and greater detent torque.
A Zener diode can be used to increase the flyback voltage. The
increased flyback voltage gives a much faster inductive load turn-OFF
current decay resulting in improved motor 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 (active low) can be
used for chopper (PWM) applications. If the ENABLE input is not used,
it should be tied low.
All inputs will float high if open circuited.
Allegro MicroSystems, Inc. reserves the right to make, from
time to time, such departures from the detail specifications as
may be required to permit improvements in the design of its
products.
The information included herein is believed to be accurate
and reliable. However, Allegro MicroSystems, Inc. assumes no
responsibility for its use; nor for any infringements of patents or
other rights of third parties which may result from its use.
Page 4
2544
QUAD DARLINGTON
POWER DRIVER
16
0.280
0.240
Dimensions in Inches
(controlling dimensions)
NOTE 4
9
0.020
0.008
0.300
BSC
0.430
MAX
0.210
MAX
7.11
6.10
0.015
MIN
1
0.070
0.045
16
1
1.77
1.15
0.022
0.014
8
0.150
0.115
0.775
0.735
0.100
BSC
Dimensions in Millimeters
(for reference only)
NOTE 4
19.68
18.67
2.54
BSC
9
8
0.005
MIN
0.13
MIN
0.508
0.204
Dwg. MA-001-17A in
10.92
MAX
7.62
BSC
5.33
MAX
0.39
MIN
0.558
0.356
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.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
3.81
2.93
Dwg. MA-001-17A mm
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