Data Sheet
29317.8
2549
PROTECTED
QUAD POWER DRIVER
Providing improved output current limiting, the UDK/UDN/
UDQ2549B and UDK/UDN/UDQ2549EB quad power drivers combine
AND logic gates and high-current bipolar outputs with complete output
protection. Each of the four outputs will sink 600 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.
UDx2549B (DIP)
OUT4
1
16
IN 4
K
2
15
IN3
OUT3
3
14
ENABLE
GROUND
4
13
GROUND
GROUND
5
12
GROUND
OUT2
6
11
V CC
K
7
10
IN 2
OUT1
8
9
IN 1
T
C
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,
the six devices in this family will tolerate short-circuits on all outputs,
simultaneously.
U
D
O
y
R
l
P n
Dwg. PP-017-1
O
D
E ce
These devices can be used to drive various loads including
incandescent lamps (without warming or limiting resistors) or inductive
loads such as relays, solenoids, or dc stepping motors.
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
U
n
e
IN r
e
T
f
N Re
Output Voltage, VOUT . . . . . . . . . . . . . 60 V
Over-Current Protected Output Voltage,
VOUT . . . . . . . . . . . . . . . . . . . . . . . 25 V
Output Current, IOUT . . . . . . . . . . . . . 1.0 A*
Supply Voltage, VCC . . . . . . . . . . . . . . 7.0 V
Input Voltage, VIN or VEN . . . . . . . . . . 7.0 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range, TA
Prefix ‘UDK’ . . . . . . . -40°C to +125°C
Prefix ‘UDN’ . . . . . . . . -20°C to +85°C
Prefix ‘UDQ’ . . . . . . . . -40°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -55°C to +150°C
O
C or
S
I
D
The suffix ‘B’ devices are 16-pin power DIPs while the suffix ‘EB’
devices are 28-lead power PLCCs for surface-mount applications.
Both packages are of batwing construction to provide for maximum
package power dissipation.
F
*Outputs are peak current limited at approximately
1.0 A per driver. See Circuit Description and
Applications for further information.
FEATURES
■
■
■
■
■
■
■
600 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 UDN2543B/EB
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., UDK2549EB .
2549
PROTECTED
QUAD POWER DRIVER
FUNCTIONAL BLOCK DIAGRAM
(1 of 4 Channels)
K
V CC
OUTN
ENABLE
IN N
THERMAL
LIMIT
<<1 Ω
Dwg. FP-041
NC
25
6
24
7
23
8
22
9
21
10
20
11
19
GROUND
GROUND
VCC
13
14
15
16
17
18
K
OUT 4
NO
CONNECTION
IN 4
IN 3
SUPPLY
NC
12
GROUND
5
OUT 3
GROUND
Dwg. PP-019-1
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
ENABLE
26
IN 2
27
IN 1
10
28
NO
CONNECTION
1
OUT1
2
K
3
4
OUT2
UDx2549EB (PLCC)
8
R θJT = 6°C/W
6
4
SUFFIX 'EB', R
θJA
= 36°C/W
2
SUFFIX 'B', R θJA = 43°C/W
0
25
50
75
100
TEMPERATURE IN °C
125
150
Dwg. GP-004-1A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1991, 2003 Allegro MicroSystems, Inc.
2549
PROTECTED
QUAD POWER DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C (prefix ‘UDN’) or over operating
temperature range (prefix ‘UDK’ or ‘UDQ’), VCC = 4.75 V to 5.25 V
Limits
Characteristic
Output Leakage Current
Symbol
ICEX
Test Conditions
Min.
Typ.
Max.
Units
VOUT = 60 V, VIN = 0.8 V, VEN = 2.0 V
—
<1.0
100
µA
VOUT = 60 V, VIN = 2.0 V, VEN = 0.8 V
—
<1.0
100
µA
Output Sustaining Voltage
VOUT(SUS)
IOUT = 100 mA, VIN = VEN = 0.8 V
40
—
—
V
Output Saturation Voltage
VOUT(SAT)
IOUT = 100 mA
—
—
200
mV
IOUT = 400 mA
—
—
400
mV
IOUT = 600 mA
—
—
600
mV
—
1.0
—
A
Over-Current Trip
Input Voltage
Input Current
Total Supply Current
ITRIP
Logic 1
VIN(1) or VEN(1)
2.0
—
—
V
Logic 0
VIN(0) or VEN(0)
—
—
0.8
V
Logic 1
VIN(1) or VEN(1) = 2.0 V
—
—
10
µA
Logic 0
VIN(0) or VEN(0) = 0.8 V
—
—
-10
µA
IOUT = 600 mA, VIN* = VEN = 2.0 V
—
—
65
mA
All Outputs OFF
—
—
15
mA
ICC
Clamp Diode Forward Voltage
VF
IF = 1.0 A
—
—
1.7
V
Clamp Diode Leakage Current
IR
VR = 60 V, D1 + D2 or D3 + D4
—
—
50
µA
Thermal Limit
TJ
—
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.
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2549
PROTECTED
QUAD POWER DRIVER
TYPICAL OUTPUT
CHARACTERISTIC
OUTPUT VOLTAGE, V OUT
J
INCANDESCENT LAMP DRIVER
High incandescent lamp turn-ON/in-rush currents can contribute to
poor lamp reliability and destroy semiconductor lamp drivers. Warming
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 600 mA
can be driven by these devices without the need for warming (parallel)
or current-limiting (series) resistors.
NOT TO SCALE
TJ < 150°C
T
CIRCUIT DESCRIPTION AND APPLICATION
= 165°C
JUNCTION
TEMP. LIMIT
THERMAL
GRADIENT
SENSING
I TRIP
V OUT(SAT)
OUTPUT CURRENT, I
OUT
Dwg. GP-013
TYPICAL OUTPUT BEHAVIOR
NORMAL LAMP IN-RUSH CURRENT
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 which 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
improve performance. However, the peak voltage must not exceed the
specified minimum sustaining voltage (VSUPPLY + VZ + VF ≤ VOUT(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.
LAMP CURRENT
NOT TO SCALE
THERMAL GRADIENT SENSING
CURRENT LIMIT
ITRIP
0
When an incandescent lamp is initially turned ON, the cold filament
is at minimum resistance and would normally allow a 10x to 12x in-rush
current. With the 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.
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.
TIME
Dwg. WP-008
If the fault condition is corrected, the output stage will return to its
normal saturated condition.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2549
PROTECTED
QUAD POWER DRIVER
UDN2549B and UDQ2549B
Dimensions in Inches
(controlling dimensions)
16
0.020
0.008
9
NOTE 4
0.430
MAX
0.280
0.240
0.300
BSC
1
0.070
0.045
0.100
0.775
0.735
8
0.005
BSC
MIN
0.210
MAX
0.015
0.150
0.115
MIN
0.022
0.014
Dwg. MA-001-17A in
Dimensions in Millimeters
(for reference only)
16
0.508
0.204
9
NOTE 4
10.92
MAX
7.11
6.10
7.62
BSC
1
1.77
1.15
2.54
19.68
18.67
8
0.13
BSC
MIN
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
NOTES: 1.
2.
3.
4.
Exact body and lead configuration at vendor’s option within limits shown.
Lead spacing tolerance is non-cumulative
Lead thickness is measured at seating plane or below.
Webbed lead frame. Leads 4, 5, 12, and 13 are internally one piece.
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Dwg. MA-001-17A mm
2549
PROTECTED
QUAD POWER DRIVER
UDN2549EB and UDQ2549EB
Dimensions in Inches
(controlling dimensions)
18
0.013
0.021
12
19
0.219
0.191
11
0.026
0.032
0.456
0.450
INDEX AREA
0.495
0.485
0.050
BSC
0.219
0.191
25
5
26
28
0.020
1
4
0.456
0.450
0.495
0.485
MIN
0.165
0.180
Dwg. MA-005-28A in
Dimensions in Millimeters
(for reference only)
18
0.331
0.533
12
19
5.56
4.85
11
0.812
0.661
11.58
11.43
12.57
12.32
1.27
INDEX AREA
BSC
5.56
4.85
25
5
26
0.51
MIN
4.57
4.20
28
1
4
11.582
11.430
12.57
12.32
Dwg. MA-005-28A mm
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 through 11 and 19 through 25 are internally one piece.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2549
PROTECTED
QUAD POWER DRIVER
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 responsibility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
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