2544

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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


Pinout




Specifications

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


Description

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.

UDN2544B  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.