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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 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 25C, and with only 1 sq. in. of copper foil at the ground tabs, the package is capable of safely dissipating 3.8 W.
Data Sheet 29317.6*
OUT4 K OUT3 GROUND GROUND OUT2 K OUT1
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
IN 4 IN3 ENABLE GROUND GROUND V CC IN 2 IN 1
Dwg. PP-017A
FEATURES
I 1.8 A Continuous Output Current I Output Voltage to 50 V I Inputs Configured for Unipolar Stepper Motors I Active-Low Output Enable
ABSOLUTE MAXIMUM RATINGS
at TA = 25C
Output Voltage, VOUT ............................. 50 V Output Current, IOUT (Peak) ........................................... 2.5 A (Continuous) ................................. 1.8 A Logic Supply Voltage, VCC .................... 7.0 V Input Voltage, VIN .................................. 7.0 V Package Power Dissipation, PD ......................................... See Graph Operating Temperature Range, TA .................................. -20C to +85C Storage Temperature Range, TS ................................ -55C to +150C
I TTL and 5 V CMOS Compatible Inputs I Integral Transient-Suppression Diodes
Always order by complete part number: UDN2544B .
2544 QUAD DARLINGTON POWER DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25C, TJ 150C, VCC = 4.75 V to 5.25 V.
Limits Characteristic Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Symbol ICEX VCE(sus) VCE(SAT) Test Conditions VOUT = 50 V IOUT = 1.8 A, L = 3.0 mH IOUT = 600 mA IOUT = 1.0 A IOUT = 1.8 A Input Voltage Logic 1 Logic 0 Input Current Logic 1 Logic 0 Total Supply Current ICC VIN(1) or VEN(1) VIN(0) or VEN(0) VIN(1) or VEN(1) = 2.4 V VIN(0) or VEN(0) = 0.8 V All Outputs ON, Outputs Open All Outputs OFF Clamp Diode Forward Voltage VF IF = 1.0 A IF = 1.8 A Clamp Diode Leakage Current IR VR = 50 V Min. -- 50 -- -- -- 2.4 -- -- -- -- -- -- -- -- Typ. <1.0 -- 0.9 1.0 1.3 -- -- -- -- 14 0.4 1.3 1.6 < 1.0 Max. 100 -- 1.0 1.2 1.6 -- 0.8 10 -100 20 2.0 1.6 2.0 100 Units A V V V V V V A A mA mA V V A
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
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
ENABLE L H
IN1 H L X
OUT1 ON OFF OFF
IN2 H L X
OUT2 OFF ON OFF
IN3 H L X
OUT3 OFF ON OFF
IN4 H L X
OUT4 ON OFF OFF
5
RJT = 6.0C/W
4
X = Don't care
3
2
R JA = 43C/W
1
0 25 50 75 100 TEMPERATURE IN C 125 150
Dwg. GP-010B
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1989, 1995 Allegro MicroSystems, Inc.
2544 QUAD DARLINGTON POWER DRIVER
TYPICAL APPLICATION
(UNIPOLAR STEPPER MOTOR WITH ZENER FLYBACK)
Dwg. EP-015
TRUTH TABLE
INPUTS 1/2 3/4 L L H H H L L H A ON OFF OFF ON WINDINGS B C ON ON OFF OFF OFF ON ON OFF D OFF OFF ON ON
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.
V BB + VF
VBB + VZ + VF
OUTPUT VOLTAGE
V BB
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.
VOUT(SAT) ZENER CLAMP DIODE CLAMP
Dwg. WP-001
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.
OUTPUT CURRENT
2544 QUAD DARLINGTON POWER DRIVER
Dimensions in Inches
(controlling dimensions)
16
NOTE 4
9
0.020 0.008
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.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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