2544

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 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. 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 = 25°C 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 .................................. -20°C to +85°C Storage Temperature Range, TS ................................ -55°C to +150°C 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 = +25°C, TJ ≤ 150°C, 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.