2916
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The UDN2916B, UDN2916EB, and UDN2916LB motor drivers are
UDN2916B (DIP) designed to drive both windings of a bipolar stepper motor or
bidirectionally control two dc motors. Both bridges are capable of
V
BB LOAD sustaining 45 V and include internal pulse-width modulation (PWM)
1 24
OUT
1A
SUPPLY
control of the output current to 750 mA.  The outputs have been opti-
E
2 23
OUT 1 mized for a low output saturation voltage drop (less than 1.8 V
2A
total source plus sink at 500 mA).
1
SENSE
3 22
E
1
2
2 For PWM current control, the maximum output current is deter-
21
4
SENSE
OUT
2
1B
mined by the user’s selection of a reference voltage and sensing
resistor.  Two logic-level inputs select output current limits of 0, 33,
5 20
 I
OUT
01
2B
67, or 100% of the maximum level. A PHASE input to each bridge
GROUND
6 19
GROUND
determines load current direction.
18
7
GROUND
GROUND
The bridges include both ground clamp and flyback diodes for
protection against inductive transients.  Internally generated delays
8
17
 I   I
11
02
prevent cross-over currents when switching current direction.  Special
9 θ  16
PHASE
9
 I
1 1 power-up sequencing is not required.  Thermal protection circuitry
12
PWM 1
disables the outputs if the chip temperature exceeds safe operating
15
10 θ  V
PHASE
REF 1
2
2
limits.
PWM 2
14
RC
The UDN2916B is supplied in a 24-pin dual in-line plastic batwing
11
V 1
REF 2
package with a copper lead-frame and heat sinkable tabs for improved
LOGIC
13
12
V
RC
CC2
SUPPLY power dissipation capabilities. The UDN2916EB is supplied in a 44-lead
power PLCC for surface mount applications.  The UDN2916LB is
supplied in a 24-lead surface-mountable SOIC.  Their batwing construc-
Dwg. PP-005
tion provides for maximum package power dissipation in the smallest
possible construction.  The UDN2916B/EB/LB are available for opera-
ABSOLUTE MAXIMUM RATINGS
tion from -40°C to +85°C.  To order, change the prefix from 'UDN' to
at T 150°C
J ≤≤≤≤≤  'UDQ'.  These devices are also available on special order for operation
to +105°C. The LB package is available in a lead-free version (100%
Motor Supply Voltage, V .................... 45 V
BB matte tin leadframe).
Output Current, I
OUT
(Peak) ........................................  +1.0 A FEATURES
(Continuous) ..........................  +750 mA
■  750 mA Continuous Output Current
Logic Supply Voltage, V ................... 7.0 V
CC
■  45 V Output Sustaining Voltage
Logic Input Voltage Range,
■  Internal Clamp Diodes
V .........................  -0.3 V to V +0.3 V
IN CC
■  Internal PWM Current Control
Output Emitter Voltage, V .................. 1.5 V
E
■  Low Output Saturation Voltage
Package Power Dissipation,
■  Internal Thermal Shutdown Circuitry
P ........................................................ See Graph
D
■  Similar to Dual PBL3717, UC3770
Operating Temperature Range,
T .................................  -20°C to +85°C
A
Always order by complete part number:
Storage Temperature Range,
Part Number Package
T ............................... -55°C to +150°C
S
UDN2916B 24-Pin DIP
Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking. UDN2916EB 44-Lead PLCC
Under any set of conditions, do not exceed the
specified peak current rating or a junction UDN2916LB 24-Lead SOIC
temperature of +150°C.
  UDN2916LB-T 24-Lead SOIC, Lead-free

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
UDN2916EB (PLCC)
1 1
5
1A 1B
1
1 REF 1
01 11
OUT E SENSE OUT LOAD SUPPLY I I PHASE V RC LOGIC SUPPLY
R       = 6.0°C/W
6 5 4 3 2 1 θJT
44 43 42 41 40
θ1 VCC
4
GND 7 39 GND SUFFIX 'EB', R       = 30°C/W
θJA
PWM 1
8 38
SUFFIX 'B', R       = 40°C/W
θJA
9 37
BB
V
3
1
10 36
11 35
12 34
2
13 33
14 2 32
15 31
1
16 30
PWM 2
SUFFIX 'LB', R       = 77°C/W
θJA
GND 17 29 GND
NC NC
θ2
0
18 19 20 21 22 23 24 25 26 27 28
25 50 75 100 125 150
2 2 2 2
2B 02 12
2A E I I ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
TEMPERATURE IN  C
REF 2 RC °°°°
OUT OUT V
SENSE PHASE Dwg. GP-035B
Dwg. PP-006A
NO CONNECTION NO CONNECTION
UDN2916LB (SOIC) PWM CURRENT-CONTROL CIRCUITRY
'B' PACKAGE, V
BB
CHANNEL 1
24
PIN NUMBERS
 I  1 24 LOAD SUPPLY SHOWN.
02
2 23 OUT OUT
 I 12 2B B
PWM 2 1 21
PHASE 3 θ  22 SENSE OUT
2 2 2 A
2
V 15
REF
V 4 21 E
REF 2 2
20 k? 23 E
RC 5 20 OUT
2 2A
÷10
– ONE
GROUND 6 19 GROUND SENSE SOURCE
+ SHOT DISABLE
22
BB 40 k?
V R
GROUND 7 18 GROUND 10 k?
C 14 RC
I 20
0
LOGIC SUPPLY 8 V 17 OUT R C
CC 1A S C
R C
I 17 T T
1
RC 99 16 E
1 1
1
V 10 15 SENSE
REF 1 1
Dwg. EP-007B
14 OUT
PHASE1 11 θ 1 1B TRUTH TABLE
PWM 1
 I  12 13  I
11 01 PHASE OUT OUT
A B
HHL
Dwg. PP-047
LLH
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts  01615-0036  (508) 853-5000
Copyright (C) 1994, 2003 Allegro MicroSystems, Inc.

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at T  = +25°C, T  ≤≤≤≤≤ 150°C, V  = 45 V, V  = 4.75 V to 5.25 V,
A J BB CC
V  = 5.0 V (unless otherwise noted).
REF
Limits
Characteristic  Symbol     Test Conditions Min. Typ. Max. Units
Output Drivers (OUT  or OUT )
A B
Motor Supply Range V 10 — 45 V
BB
Output Leakage Current I V  =  V — < 1.0  50 μA
CEX OUT BB
V  = 0 — <–1.0 –50 μA
OUT
Output Sustaining Voltage V I  = ±750 mA, L = 3.0 mH 45 — — V
CE(sus) OUT
Output Saturation Voltage V Sink Driver, I = +500 mA — 0.4 0.6 V
CE(SAT) OUT
Sink Driver, I  = +750 mA — 1.0 1.2 V
OUT
Source Driver, I  = –500 mA — 1.0 1.2 V
OUT
Source Driver, I  = –750 mA — 1.3 1.5 V
OUT
Clamp Diode Leakage Current I V =45 V — < 1.0 50 μA
R R  
Clamp Diode Forward Voltage V I  = 750 mA — 1.6 2.0 V
F F
Driver Supply Current I Both Bridges ON, No Load — 20 25 mA
BB(ON)
I Both Bridges OFF — 5.0 10 mA
BB(OFF)
Control Logic
Input Voltage V All inputs 2.4 — — V
IN(1)
V All inputs — — 0.8 V
IN(0)
Input Current I V  = 2.4 V — <1.0 20 μA
IN(1) IN
V  = 0.8 V — – 3.0 –200 μA
IN
Reference Voltage Range V Operating 1.5  — 7.5 V
REF
Current Limit Threshold V /V I = I = 0.8 V 9.5 10 10.5 —
REF SENSE 0  1
(at trip point)
I  = 2.4 V, I  = 0.8 V 13.5 15 16.5 —
0 1
I  = 0.8 V, I  = 2.4 V 25.5 30 34.5 —
0 1
Thermal Shutdown Temperature T — 170 — °C
J
Total Logic Supply Current I I  = I = 0.8 V, No Load — 40 50 mA
CC(ON) 0 1
I I  = I = 2.4 V, No Load — 10 12 mA
CC(OFF) 0 1
Fixed Off-Time t R  = 56 k?, C  = 820 pF — 46 — μs
off T T
www.allegromicro.com
3

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
APPLICATIONS INFORMATION
PWM CURRENT CONTROL
PWM OUTPUT CURRENT WAVE FORM
The UDN2916B/EB/LB dual bridges are designed to
drive both windings of a bipolar stepper motor.  Output
current is sensed and controlled independently in each
bridge by an external sense resistor (R ), internal com-
S
V
PHASE
parator, and monostable multivibrator.
When the bridge is turned ON, current increases in
the motor winding and it is sensed by the external sense
+
resistor until the sense voltage (V ) reaches the level
SENSE
set at the comparator’s input: I 0
OUT
–
                  I  = V /10 R
TRIP REF S
The comparator then triggers the monostable which
I      
TRIP
turns OFF the source driver of the bridge.  The actual
load current peak will be slightly higher than the trip point
(especially for low-inductance loads) because of the td toff
internal logic and switching delays.  This delay (t ) is
d
Dwg. WM-003-1A
typically 2 μs. After turn-off, the motor current decays,
circulating through the ground-clamp diode and sink
transistor.  The source driver’s OFF time  (and therefore
the magnitude of the current decrease) is determined by
the monostable’s external RC timing components, where
t  = R C  within the range of 20 k? to 100 k? and
off T T
100 pF to 1000 pF.
LOAD CURRENT PATHS
The fixed-off time should be short enough to keep
the current chopping above the audible range (< 46 μs)
and long enough to properly regulate the current. Be-
V
BB
cause only slow-decay current control is available, short
off times (< 10 μs) require additional efforts to ensure
proper current regulation. Factors that can negatively
affect the ability to properly regulate the current when
using short off times include: higher motor-supply volt-
age, light load, and longer than necessary blank time.
When the source driver is re-enabled, the winding
current (the sense voltage) is again allowed to rise to the
comparator’s threshold.  This cycle repeats itself, main-
taining the average motor winding current at the desired
level.
Loads with high distributed capaci-tances may
result in high turn-ON current peaks.  This peak (appear-
BRIDGE ON
R
ing across R ) will attempt to trip the comparator, result-
S
S SOURCE OFF
ing in erroneous current control or high-frequency
ALL OFF
oscillations.  An external R C  time delay should be used
C C
Dwg. EP-006-1
to further delay the action of the comparator.  Depending
on load type, many applications will not require these
external components (SENSE connected to E).
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts  01615-0036  (508) 853-5000

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT
Two logic level inputs (l  and I ) allow digital selection of the motor sequence. This is accomplished by digitally
0 1
winding current at 100%, 67%, 33%, or 0% of the maximum level per selecting 100% drive current when only one
the table. The 0% output current condition turns OFF all drivers in the phase is ON and 67% drive current when two
bridge and can be used as an OUTPUT ENABLE function. phases are ON. Logic highs on both l  and l
0 1
turn OFF all drivers to allow rapid current
CURRENT-CONTROL TRUTH TABLE decay when switching phases. This helps to
ensure proper motor operation at high step
l I Output Current
0 1 rates.
LL V /10 R  = I
REF S TRIP The logic control inputs can also be
HLV /15 R  = 2/3 I used to select a reduced current level (and
REF S TRIP
reduced power dissipation) for ‘hold’ condi-
LHV /30 R  = 1/3 I
REF S TRIP tions and/or increased current (and available
torque) for start-up conditions.
HH  0
These logic level inputs greatly enhance the implementation of GENERAL
μP-controlled drive formats.
The PHASE input to each bridge
determines the direction motor winding
During half-step operations, the l  and l allow the μP to control the
0 1
current flows. An internally generated
motor at a constant torque between all positions in an eight-step
deadtime (approximately 2 μs) prevents
crossover currents that can occur when
switching the PHASE input.
TYPICAL APPLICATION
All four drivers in the bridge output can
STEPPER
be turned OFF between steps (l  = l ? 2.4 V)
MOTOR 0 1
resulting in a fast current decay through the
internal output clamp and flyback diodes. The
fast current decay is desirable in half-step and
V
BB
V
BB high-speed applications. The PHASE, l ,and I
1 24 0 1
inputs float high.
+
R
S
23
2
R
Varying the reference voltage (V )
R
C
S 1 REF
22
3
provides continuous control of the peak load
R
C
C
C current for micro-stepping applications.
2
21
4
C
C
Thermal protection circuitry turns OFF
20
5
all drivers when the junction temperature
reaches +170°C. It is only intended to protect
6
19
the device from failures due to excessive
FROM
18
7
junction temperature and should not imply
μP
that output short circuits are permitted. The
8
17
output drivers are re-enabled when the
FROM junction temperature cools to +145°C.
9
16
9 θ
 
1
μP
PWM 1
The UDN2916B/EB/LB output drivers
15
10 θ V
 
2
REF
PWM 2 are optimized for low output saturation
14
V
11
voltages—less than 1.8 V total (source plus
REF
820 pF 56 k?
sink) at 500 mA. Under normal operating
R
1312
T
V
C
CC
T conditions, when combined with the excellent
820 pF
? +5 V
56 k
R C thermal properties of the batwing package
T
T
design, this allows continuous operation of
Dwg. EP-008B1
both bridges simultaneously at 500 mA.
www.allegromicro.com
5

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
UDN2916B
Dimensions in Inches
(controlling dimensions)
0.014
0.008
24 NOTE 1 13
0.430
MAX
0.280
0.300
0.240
BSC
16 7 12
0.070 0.100 0.005
BSC MIN
0.045 1.280
1.230
0.210
MAX
0.015 0.150
MIN
0.115
0.022
Dwg. MA-001-25A in
0.014
Dimensions in Millimeters
(for reference only)
0.355
0.204
24 NOTE 1 13
10.92
MAX
7.11
7.62
6.10
BSC
1 67 12
1.77 2.54 0.13
BSC MIN
1.15 32.51
31.24
5.33
MAX
0.39 3.81
MIN
2.93
0.558
Dwg. MA-001-25A mm
0.356
NOTES:1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Lead thickness is measured at seating plane or below.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendor’s option within limits shown.
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts  01615-0036  (508) 853-5000

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
UDN2916EB
28 18
29 17
0.032
0.319
0.026
0.291
0.021 0.695
0.013 0.685
0.656 Dimensions in Inches
0.650
(controlling dimensions)
INDEX AREA
0.319
0.291
0.050
BSC
39 7
40 44 1 2 6
0.020 0.656
MIN
0.650
0.180 0.695
0.165 0.685
Dwg. MA-005-44A in
28 18
29 17
0.812
8.10
0.661
7.39
17.65
0.533
17.40
0.331
16.662 Dimensions in Millimeters
16.510
(for reference only)
INDEX AREA
8.10
7.39
1.27
BSC
39 7
40 44 1 2 6
0.51 16.662
MIN
16.510
4.57 17.65
4.20 17.40
Dwg. MA-005-44A mm
OTES: 1. MO-047AC except for terminal shoulder height.  Intended to meet new JEDEC Standard when that is approved.
2. Webbed lead frame. Leads 7-17 and 29-39 are internally one piece.
3. Lead spacing tolerance is non-cumulative.
4. Exact body and lead configuration at vendor’s option within limits shown.
www.allegromicro.com
7

2916
DUAL FULL-BRIDGE
MOTOR DRIVER
UDN2916LB
24 13
0.0125
0.0091
0.419
0.2992
Dimensions in Inches
0.394
0.2914
(for reference only)
0.050
0.016
0.020 1 2 3
0.050
0.013 0.6141 0° TO 8°
BSC
0.5985
NOTE 1
NOTE 3
0.0926
0.1043
Dwg. MA-008-25A in
0.0040 MIN.
24
0.32
0.23
Dimensions in Millimeters
7.60 10.65
7.40 10.00 (controlling dimensions)
1.27
0.40
0.51
1 2 3 1.27
0.33 15.60 BSC 0° TO 8°
15.20
NOTE 1
NOTE 3
2.65
2.35
0.10 MIN.   Dwg. MA-008-25A mm 
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
NOTES:1. Webbed lead frame. Leads indicated are internally
to permit improvements in the design of its products.
one piece.
The information included herein is believed to be accurate and
2. Lead spacing tolerance is non-cumulative.
reliable.  However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of 3. Exact body and lead configuration at vendor’s option
third parties which may result from its use. within limits shown.
115 Northeast Cutoff, Box 15036
8 Worcester, Massachusetts  01615-0036  (508) 853-5000