Always order by complete part number: a prefix to
indicate operating temperature range + the basic four-digit
part number + a suffix to indicate package style, e.g., UDK2559LB .

UDx2559LB

UDx2559B

PROTECTED

QUAD POWER DRIVER

Providing improved output current limiting, the UDK, UDN, and

UDQ2559B, EB, and LB quad power drivers combine AND logic
gates and high-current bipolar outputs with complete output protection.
Each of the four outputs will sink 700 mA in the on state. The outputs
have a minimum breakdown voltage (load dump) of 60 V and a
sustaining voltage of 40 V. The inputs are compatible with TTL and
5 V CMOS logic systems.

Over-current protection for each channel has been designed into

these devices and is activated at approximately 1 A. It protects each
output from short circuits with supply voltages up to 25 V. When an
output current trip point is reached, that output stage is driven linearly
resulting in a reduced output current level. If an over-current or short-
circuit condition continues, the thermal-limiting circuits will first sense
the rise in junction temperature and then the rise in chip temperature,
further decreasing the output current. Under worst-case conditions,
these devices will tolerate short circuits on all outputs, simultaneously.

These devices can be used to drive various loads including incan-

descent lamps (without warming or limiting resistors) or inductive
loads such as relays, solenoids, or dc stepping motors.

The suffix ‘B’ devices are 16-pin power DIPs, the suffix ‘EB’

devices are 28-lead power PLCCs and suffix ‘LB’ devices are 16-lead
power SOICs for surface-mount applications. All three packages are
of batwing construction to provide for maximum package power
dissipation.

FEATURES

■

700 mA Output Current per Channel

■

Independent Over-Current Protection for Each Driver

■

Thermal Protection for Device and Each Driver

■

Low Output-Saturation Voltage

■

Integral Output Flyback Diodes

■

TTL and 5 V CMOS Compatible Inputs

■

Pin-Compatible With UDQ2543B/EB and UDK2549B/EB

ABSOLUTE MAXIMUM RATINGS

at T

A

= 25

°

C

Output Voltage, V

OUT

. . . . . . . . . 60 V

Over-Current Protected Output Voltage,

V

OUT

. . . . . . . . . . . . . . . . . . . 25 V

Output Current, I

OUT

. . . . . . . . . 1.0 A*

Supply Voltage, V

CC

. . . . . . . . . . 7.0 V

Input Voltage, V

IN

or V

EN

. . . . . . 7.0 V

Package Power Dissipation,

P

D

. . . . . . . . . . . . . . . . See Graph

Operating Temperature Range, T

A

Prefix ‘UDK’ . . . . -40

°

C to +125

°

C

Prefix ‘UDN’ . . . . . -20

°

C to +85

°

C

Prefix ‘UDQ’ . . . . . -40

°

C to +85

°

C

Storage Temperature Range,

T

S

. . . . . . . . . . . . -55

°

C to +150

°

C

*Outputs are peak current limited at
approximately 1.0 A per driver. See
Circuit Description and Application for
further information.

Data Sheet

29317.14B

1

2

3

14

4

5

6

7

8

9

10

11

12

13

15

16

ENABLE

GROUND

GROUND

OUT

2

K

GROUND

GROUND

OUT

3

OUT

4

K

OUT

1

V

CC

IN

1

Dwg. PP-017-1

IN

4

IN

3

IN

2

1

16

2559

2559
PROTECTED
QUAD POWER DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

FUNCTIONAL BLOCK DIAGRAM

(1 of 4 Channels)

UDx2559EB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

GROUND

GROUND

GROUND

GROUND

Dwg. PP-019-1

K

NO

CONNECTION

ENABLE

SUPPLY

NC

NC

CC

V

OUT

1

OUT

2

OUT

3

OUT

4

IN

4

IN

3

IN

2

IN

1

NO

CONNECTION

K

50

75

100

125

150

5

3

2

1

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

TEMPERATURE IN

°°°°

C

4

25

R = 6

°

C/W

θ

JT

Dwg. GP-004-2B

SUFFIX 'EB', R = 36

°

C/W

θ

JA

SUFFIX 'B', R = 43

°

C/W

θ

JA

SUFFIX 'LB', R = 90

°

C/W

θ

JA

P

D

= (V

OUT1

x I

OUT1

x dc) + … + (V

OUTn

x I

OUTn

x dc)

+ (V

CC

x I

CC

) = (T

J

- T

A

)/R

θ

JA

VCC

<<1

Ω

OUT

Dwg. FP-041

N

IN N

THERMAL

LIMIT

ENABLE

K

Copyright © 1995, 2002 Allegro MicroSystems, Inc.

2559

PROTECTED

QUAD POWER DRIVER

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at T

A

= +25

°

C (prefix ‘UDN’) or over operating

temperature range (prefix ‘UDK’ or ‘UDQ’), V

CC

= 4.75 V to 5.25 V

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Output Leakage Current

I

CEX

V

OUT

= 50 V, V

IN

= 0.8 V, V

EN

= 2.0 V

—

<1.0

100

µ

A

V

OUT

= 50 V, V

IN

= 2.0 V, V

EN

= 0.8 V

—

<1.0

100

µ

A

Output Sustaining Voltage

V

OUT(SUS)

I

OUT

= 100 mA, V

IN

= V

EN

= 0.8 V

40

—

—

V

Output Saturation Voltage

V

OUT(SAT)

All Devices, I

OUT

= 100 mA

—

—

300

mV

All Devices, I

OUT

= 400 mA

—

—

500

mV

‘B’ & ‘EB’ Packages Only, I

OUT

= 600 mA

—

—

700

mV

Over-Current Trip

I

TRIP

—

1.0

—

A

Input Voltage

Logic 1

V

IN(1)

or V

EN(1)

2.0

—

—

V

Logic 0

V

IN(0)

or V

EN(0)

—

—

0.8

V

Input Current

Logic 1

V

IN(1)

or V

EN(1)

= 2.0 V

—

—

40

µ

A

Logic 0

V

IN(0)

or V

EN(0)

= 0.8 V

—

—

-10

µ

A

Total Supply Current

I

CC

All Outputs ON, V

IN

* = V

EN

= 2.0 V

—

—

80

mA

All Outputs OFF

—

—

5.0

mA

Clamp Diode Forward Voltage

V

F

I

F

= 1.0 A

—

—

1.7

V

I

F

= 1.5 A

—

—

2.1

V

Clamp Diode Leakage Current

I

R

V

R

= 50 V, D

1

+ D

2

or D

3

+ D

4

—

—

50

µ

A

Turn-On Delay

t

PHL

I

OUT

= 500 mA

—

—

20

µ

s

t

PLH

I

OUT

= 500 mA

—

—

20

µ

s

Thermal Limit

T

J

—

165

—

°

C

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.
* All inputs simultaneously, all other tests are performed with each input tested separately.

2559
PROTECTED
QUAD POWER DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

TYPICAL OUTPUT

CHARACTERISTIC

CIRCUIT DESCRIPTION AND APPLICATION

INCANDESCENT LAMP DRIVER

High incandescent lamp turn-ON/in-rush currents can contribute to

poor lamp reliability and destroy semiconductor lamp drivers. Warm-
ing or current-limiting resistors protect both driver and lamp but use
significant power either when the lamp is OFF or when the lamp is
ON, respectively. Lamps with steady-state current ratings up to 700
mA can be driven by these devices without the need for warming
(parallel) or current-limiting (series) resistors.

When an incandescent lamp is initially turned ON, the cold fila-

ment is at minimum resistance and would normally allow a 10x to 12x
in-rush current. With these drivers, during turn-ON, the high in-rush
current is sensed by the internal low-value sense resistor. Drive current
to the output stage is then diverted by the shunting transistor, and the
load current is momentarily limited to approximately 1.0 A. During
this short transition period, the output current is reduced to a value
dependent on supply voltage and filament resistance. During lamp
warmup, the filament resistance increases to its maximum value, the
output stage goes into saturation and applies maximum rated voltage to
the lamp.

INDUCTIVE LOAD DRIVER

Bifilar (unipolar) stepper motors, relays, or solenoids can be driven

directly. The internal flyback diodes prevent damage to the output transistors
by suppressing the high-voltage spikes that occur when turning OFF an
inductive load.

For rapid current decay (fast turn-OFF speeds), the use of Zener diodes

will raise the flyback voltage and inprove performance. However, the peak
voltage must not exceed the specified minimum sustaining voltage (V

SUPPLY

+

V

Z

+ V

F

≤

V

OUT(SUS)

).

FAULT CONDITIONS

In the event of a shorted load, the load current will attempt to

increase. As described above, the drive current to the affected output
stage is reduced, causing the output stage to go linear, limiting the peak
output current to approximately 1 A. As the power dissipation of that
output stage increases, a thermal gradient sensing circuit will become
operational, further decreasing the drive current to the affected output
stage and reducing the output current to a value dependent on supply
voltage and load resistance.

Continuous or multiple overload conditions causing the chip

temperature to reach approximately 165

°

C will result in an additional

reduction in output current to maintain a safe level.

If the fault condition is corrected, the output stage will return to its

normal saturated condition.

TYPICAL OUTPUT BEHAVIOR

V

OUT(SAT)

Dwg. GP-013

OUTPUT VOLTAGE, V

OUT

OUTPUT CURRENT, I

OUT

T < 150

°

C

T = 165

°

C

J

J

JUNCTION

TEMP. LIMIT

NOT TO SCALE

TRIP

I

THERMAL

GRADIENT

SENSING

NORMAL LAMP IN-RUSH CURRENT

TIME

THERMAL GRADIENT SENSING
CURRENT LIMIT

Dwg. WP-008

NOT TO SCALE

I

TRIP

0

LAMP CURRENT

2559

PROTECTED

QUAD POWER DRIVER

www.allegromicro.com

UDx2559B

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

0.508
0.204

7.62

BSC

Dwg. MA-001-17A mm

10.92

MAX

16

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

9

19.68
18.67

NOTE 4

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.

2. Lead spacing tolerance is non-cumulative
3. Lead thickness is measured at seating plane or below.
4. Webbed lead frame. Leads 4, 5, 12, and 13 are internally one piece.

0.020
0.008

0.300

BSC

Dwg. MA-001-17A in

0.430

MAX

16

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

9

0.775
0.735

NOTE 4

2559
PROTECTED
QUAD POWER DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

UDx2559EB

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.

2. Lead spacing tolerance is non-cumulative
3. Webbed lead frame. Leads 5–11, and 19–25 are internally one piece.

18

12

0.020

MIN

0.050

BSC

1

28

INDEX AREA

Dwg. MA-005-28A in

0.026
0.032

0.013
0.021

26

25

19

11

4

5

0.165
0.180

0.495
0.485

0.456
0.450

0.495
0.485

0.456
0.450

0.219
0.191

0.219
0.191

0.51

MIN

4.57
4.20

1.27

BSC

12.57
12.32

11.582
11.430

1

28

INDEX AREA

Dwg. MA-005-28A mm

0.812
0.661

0.331
0.533

12.57
12.32

26

25

19

18

12

11

4

5

11.58
11.43

5.56
4.85

5.56
4.85

2559

PROTECTED

QUAD POWER DRIVER

www.allegromicro.com

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.

2. Lead spacing tolerance is non-cumulative
3. Webbed lead frame. Leads 4, 5, 12, and 13 are internally one piece.

UDx2559LB

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

0

°

TO

8

°

1

2

3

0.2992
0.2914

0.4133
0.3977

0.419
0.394

0.020
0.013

0.0926
0.1043

0.0040

MIN.

0.0125
0.0091

0.050
0.016

Dwg. MA-008-17A in

0.050

BSC

16

9

0

°

TO

8

°

9

1

16

2

3

7.60
7.40

10.50
10.10

10.65
10.00

0.51
0.33

2.65
2.35

0.10

MIN.

0.32
0.23

1.27
0.40

Dwg. MA-008-17A mm

1.27

BSC

2559
PROTECTED
QUAD POWER DRIVER

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

The products described here are manufactured under one or more

U.S. patents or U.S. patents pending.

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 performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components

in life-support devices or systems without express written approval.

The information included herein is believed to be accurate and

reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.