Datasheet UDN2987LW, UDN2987A Datasheet (Allegro)

2987

8-CHANNEL
SOURCE DRIVER

8-CHANNEL SOURCE DRIVER

WITH OVER-CURRENT PROTECTION

Providing over-current protection for each of its eight sourcing
outputs, the UDN2987A and UDN2987LW drivers are used as an
interface between standard low-level logic and relays, motors, sole­noids, LEDs, and incandescent lamps. The device includes thermal
shutdown and output transient protection/clamp diodes for use with
sustaining voltages to 35 V.

In these drivers, each channel includes a latch to turn OFF that
channel if the maximum channel current is exceeded. All channels are
disabled if the thermal shutdown is activated. A common FAULT
output is used to indicate either chip thermal shutdown or any over­current condition. All outputs are enabled by pulling the common OE/
R input high. When OE/R is low, all outputs are inhibited and the eight
latches are reset.

Under normal operating conditions, each of eight outputs will
source in excess of 100 mA continuously at an ambient temperature of
25°C and a supply of 35 V. The over-current fault circuit will protect
the device from short-circuits to ground with supply voltages of up to
35 V.

The inputs are compatible with 5 V and 12 V logic systems—TTL,
Schottky TTL, DTL, PMOS, and CMOS. In all cases, the output is
switched ON by an active high input level. The UDN2987A is supplied
in a 20-pin dual in-line plastic package; the UDN2987LW is supplied in
a 20-lead small-outline plastic package.

FEATURES

■ 350 mA Output Source Current

■ Over-Current Protected

■ Internal Ground Clamp Diodes

■ Output Breakdown Voltage 35 V, Minimum

■ TTL, DTL, PMOS, or CMOS Compatible Inputs

■ Internal Thermal Shutdown

■ Automotive Capable

Data Sheet

29310.4A

Always order by complete part number:

Part Number Package
UDN2987A 20-Pin DIP
UDN2987LW 20-Lead Wide-Body SOIC

Note that the UDN2987A (DIP) and the UDN2987LW
(SOIC) are electrically identical and share a common
terminal number assignment.

Dwg. PP-067

V

S

1

2

3

4

5

6

7

8

14

15

16

17

18

19

20

9

10

11

12

13

GROUND

OUT

IN

FAULT

OE/R

1

OEN

OE

SENSEN

FF

x8

OUT

2

OUT

3

OUT

4

OUT

5

OUT

6

OUT

7

OUT

8

1

IN

2

IN

3

IN

4

IN

5

IN

6

IN

7

IN

8

2987

ABSOLUTE MAXIMUM RATINGS

at T

A

= +25°C

Driver Supply Voltage, VS..................... 35 V

Output Sustaining Voltage, V

CE(sus)

...... 35 V

Continuous Output Current,

I

OUT

........................................ -500 mA*

FAULT Output Voltage, V

CE

................. 35 V

FAULT Output Current, l

C

................. 30 mA

Input Voltage, V

IN

................................. 15 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

* Outputs are disabled at approximately -500 mA

per driver.

2987

8-CHANNEL
SOURCE DRIVER

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

FUNCTIONAL BLOCK DIAGRAM

OUTPUT CURRENT WAVESHAPES

OVER-CURRENT FAULT SENSE

Dwg. No. A-13,293

Dwg. No. A-13,292

Dwg. No. A-13,286

PHL

50 75 100 125 150

2.5

0.5

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

AMBIENT TEMPERATURE IN °C

2.0

1.5

1.0

25

Dwg. GS-004A

SUFFIX 'LW', R = 70

°C/W

θJA

SUFFIX 'A', R = 55°C/W

θJA

Copyright © 1987, 1997, Allegro MicroSystems, Inc.

2987

8-CHANNEL
SOURCE DRIVER

ELECTRICAL CHARACTERISTICS at T

A

= 25°C, V

OE

= 2.4 V, VS = 35 V

(unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Functional Supply Range V

S

7.0 — 35 V

Output Leakage Current I

CEX

VIN = 0.4 V* — <-5.0 -200 µA

Output Sustaining Voltage V

OUT(sus)

I

OUT

= -350 mA, L = 2.0 mH 35 — — V

Output Saturation Voltage V

OUT(SAT)

VIN = 2.4 V, I

OUT

= -100 mA — 1.6 1.8 V

V

IN

= 2.4 V, I

OUT

= -225 mA — 1.7 1.9 V

V

IN

= 2.4 V, I

OUT

= -350 mA — 1.8 2.0 V

Channel Shutdown Threshold I

M

VIN = 2.4 V -370 -500 — mA

FAULT Leakage Current I

CEX

VCC = 35 V — <1.0 100 µA

FAULT Saturation Voltage V

CE(SAT)

IC = 30 mA — 0.3 0.8 V

Input Voltage V

IN(ON)

2.4 — — V

V

IN(OFF)

— — 0.4 V

Input Current I

IN(ON)

VIN = 2.4 V — 125 170 µA

V

IN

= 5.0 V — 840 1020 µA

V

IN

= 12 V — 1500 1800 µA

I

IN(OFF)

VIN = 0.4 V — — 15 µA

Clamp Diode Leakage Current I

R

VR = 35 V, TA = 70°C——50µA

Clamp Diode Forward Voltage V

F

IF = 350 mA — 1.5 1.8 V

Supply Current I

S(ON)

VIN = 2.4 V*, Outputs Open — 13 18 mA

I

S(OFF)

VIN = 0.4 V* — 8.0 12 mA

Thermal Shutdown T

J

— 165 — °C

Thermal Hysteresis ∆T

J

—15— °C

Propagation Delay Time t

PLH

RL = 100Ω — 0.3 0.6 µs

t

PHL

RL = 100Ω — 2.0 4.0 µs

Dead Time t

d

— 1.0 — µs

*AII inputs simultaneously.

2987

8-CHANNEL
SOURCE DRIVER

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

APPLICATIONS INFORMATION

AND CIRCUIT DESCRIPTION

As with all power integrated circuits, the UDN2987A
and UDN2987LW have a maximum allowable output
current rating. The 500 mA rating does not imply that
operation at that value is permitted or even obtainable.
The channel output current trip point is specified as -370
mA, minimum; therefore, attempted operation at current
levels greater than -370 mA may cause a fault indication
and channel shutdown. The device is tested at a maxi­mum of -350 mA and that is the recommended maximum
output current per driver. It provides protection for current
overloads or shorted loads up to 35 V.

All outputs are enabled by pulling the OE/R input high.
When OE/R is low or allowed to float (internal pull-down),
all outputs are inhibited and the latches are reset. Note
that the RESET pulse duration (OE/R low) should be
at least 1 µs. This will ensure safe operation under
attempted RESET conditions with a shorted load. The
latches are also reset during power up, regardless of the
state of the OE/R input.

The load current causes a small voltage drop across
the internal low-value sense resistor. This voltage is
compared to the voltage drop across a reference resistor
with a constant current. The two resistors are matched to
eliminate errors due to manufacturing tolerances or
temperature effects. Each channel includes a comparator
and its own latch. An over-current fault (V

SENSE

> V

REF

)
will set the affected latch and shut down only that channel.
All other channels will continue to operate normally. The
latch includes a 1 µs delay (td) to prevent unwanted
triggering due to crossover currents generated when
switching inductive loads. For an abrupt short circuit, the
delay and output switching times will allow a brief,
permissable current in excess of the trip current before the
output driver is turned OFF.

A common thermal shutdown disables all outputs
if the chip temperature exceeds +165°C. At thermal
shutdown, all latches are reset. The outputs are disabled
until the chip cools down to about +150°C (thermal
hysteresis).

A common open-collector FAULT output is used to
indicate any channel over-current condition or chip
thermal shutdown.

ALLOWABLE OUTPUT CURRENT

AS A FUNCTION OF DUTY CYCLE

(UDN2987A shown, multiply by 78% for UDN2987LW)

At +25°C

At +50°C

2987

8-CHANNEL
SOURCE DRIVER

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.

Dimensions in Millimeters

(for reference only)

UDN2987A

Dimensions in Inches

(controlling dimensions)

0.014

0.008

0.300

BSC

Dwg. MA-001-20 in

0.430

MAX

20

1

10

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

11

1.060

0.980

0.355

0.204

7.62

BSC

Dwg. MA-001-20 mm

10.92

MAX

20

1

10

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

11

26.92

24.89

2987

8-CHANNEL
SOURCE DRIVER

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

UDN2987LW

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

0° TO 8°

1 2

3

0.020

0.013

0.0040

MIN.

0.0125

0.0091

0.050

0.016

Dwg. MA-008-20 in

0.050

BSC

20 11

0.2992

0.2914

0.419

0.394

0.5118

0.4961

0.0926

0.1043

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

2. Lead spacing tolerance is non-cumulative.

0° TO 8°

1

20

2

3

0.51

0.33

0.10

MIN.

Dwg. MA-008-20 mm

1.27

BSC

11

0.32

0.23

1.27

0.40

7.60

7.40

10.65

10.00

13.00

12.60

2.65

2.35

2987

8-CHANNEL
SOURCE DRIVER

This page intentionally left blank

2987

8-CHANNEL
SOURCE DRIVER

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

POWER SOURCE DRIVERS

SELECTION GUIDE

IN ORDER OF 1) OUTPUT CURRENT, 2) OUTPUT VOLTAGE, 3) NUMBER OF DRIVERS

Output Ratings *

Features

Serial Latched Diode Saturated Internal

mA V # Input Drivers Clamp Outputs Protection Part Number

†

-25 60 8 – X – – – 5815

60 10 X X Active Pull-Down – – 5810-F and 6809/10

60 12 X X Active Pull-Down – – 5811 and 6811

60 20 X X Active Pull-Down – – 5812-F and 6812

60 32 X X Active Pull-Down – – 5818-F and 6818

85 8 – – – – – 6118

-120 -25 8 – – X X – 2585

30 8 – – X X – 2985

50 8 X X X X – 5895

-350 35 8 – – X – X 2987

50 8 – – X – – 2981 and 2982

50 8 X X X – – 5891

-50 8 – – X – – 2580

80 8 – – X – – 2983 and 2984

80 8 X X X – – 5890

-80 8 – – X – – 2588

* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or

over-current protection voltage limits.

† Complete part number includes additional characters to indicate operating temperature range and package style.

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.