2544 ALLEGRO | Alldatasheet

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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

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 I TTL and 5 V CMOS Compatible Inputs I Integral Transient-Suppression Diodes Always order by complete part number: UDN2544B . ABSOLUTE MAXIMUM RATINGS at TA = 25°C Output Current, IOUT Package Power Dissipation, Operating Temperature Range, Storage Temperature Range, 2544 Data Sheet 29317.6* 3 14 8 9 ENABLE GROUND GROUND OUT K GROUND GROUND OUT3 OUT4 K OUT1 V CC IN 1 Dwg. PP-017A IN4 IN3 IN 2

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Leakage Current I CEX VOUT = 50 V — <1.0 100 µA Output Sustaining Voltage V CE(sus) IOUT = 1.8 A, L = 3.0 mH 50 — — V Output Saturation Voltage V CE(SAT) IOUT = 600 mA — 0.9 1.0 V IOUT = 1.0 A — 1.0 1.2 V IOUT = 1.8 A — 1.3 1.6 V Input Voltage Logic 1 V IN(1) or VEN(1) 2.4 — — V Logic 0 V IN(0) or VEN(0) — — 0.8 V Input Current Logic 1 V IN(1) or VEN(1) = 2.4 V — — 10 µA Logic 0 V IN(0) or VEN(0) = 0.8 V — — -100 µA Total Supply Current I CC All Outputs ON, Outputs Open — 14 20 mA All Outputs OFF — 0.4 2.0 mA Clamp Diode Forward Voltage V F IF = 1.0 A — 1.3 1.6 V IF = 1.8 A — 1.6 2.0 V Clamp Diode Leakage Current I R 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. ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ ≤ 150°C, VCC = 4.75 V to 5.25 V. TRUTH TABLE ENABLE IN 1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 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 W Copyright © 1989, 1995 Allegro MicroSystems, Inc. 50 75 100 125 150 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTSTEMPERATURE IN °C Dwg. GP-010B R = 43°C/WθJA R = 6.0°C/WθJT

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. 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 ONOUTPUT VOLTAGE OUTPUT CURRENT ZENER CLAMP DIODE CLAMP VBB VOUT(SAT) V + VBB F V + V + VBB Z F TYPICAL APPLICATION (UNIPOLAR STEPPER MOTOR WITH ZENER FLYBACK) Dwg. EP-015 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.

Worcester, Massachusetts 01615-0036 (508) 853-5000 Dimensions in Millimeters (for reference only) Dimensions in Inches (controlling dimensions) 0.020 0.008 0.300 BSC Dwg. MA-001-17A in 0.430 MAX 1 8 0.280 0.240 0.210 MAX 0.070 0.045 0.015 MIN 0.022 0.014 0.100 BSC 0.005 MIN 0.150 0.115 0.775 0.735 NOTE 4 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. 0.508 0.204 7.62 BSC Dwg. MA-001-17A mm 10.92 MAX 1 8 7.11 6.10 5.33 MAX 1.77 1.15 0.39 MIN 0.558 0.356 2.54 BSC 0.13 MIN 3.81 2.93 19.68 18.67 NOTE 4