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

(Peak) ........................................... 2.5 A

(Continuous) ................................. 1.8 A

Package Power Dissipation,

Operating Temperature Range,

Storage Temperature Range,

2544

1

2

3

14

4

5

6

7

8

9

10

11

12

13

15

16

ENABLE

GROUND

GROUND

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GROUND

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Dwg. PP-017A