A3964SB Allegro Microsystems Inc, A3964SB Datasheet - Page 8

• Manufacturer Part Number: A3964SB
• Description: IC MOTOR DRIVER PWM DUAL 24-DIP
• Manufacturer: Allegro Microsystems Inc

Specifications of A3964SB

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: ±800mA
• Voltage - Load: 5 V ~ 30 V
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 24-DIP (0.300", 7.62mm)
• Operating Current: 85mA
• Operating Temperature Classification: Commercial
• Package Type: PDIP
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A3964
The thermal performance in applications that run at high load
currents and/or high duty cycles can be improved by adding
external diodes from each output to ground in parallel with the
internal diodes. Fast-recovery (≤ 200 ns) diodes should be used to
minimize switching losses.
The load supply terminal, V
electrolytic capacitor (≥47 μF is recommended) placed as close
to the device as is physically practical. To minimize the effect of
system ground IR drops on the logic and reference input signals
the system ground should have a low-resistance return to the
mit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
nor for any in fringe ment of patents or other rights of third parties which may result from its use.
Copyright ©1997-2008, Allegro MicroSystems, Inc.
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 de par tures from the detail spec i fi ca tions as may be required to per-
Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
The in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use;
20X
0.10
0.41 ±0.10
C
20
All dimensions nominal, not for tooling use
Dimensions in millimeters
Pins 5, 6, 15 and 16 internally fused
(Reference JEDEC MS-013 AC)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
1
2
A
BB
, should be decoupled with an
12.80±0.20
1.27
For the latest version of this document, visit our website:
LB package 20-pin SOICW
7.50±0.10
0.20 ±0.10
www.allegromicro.com
Dual Full-Bridge PWM Motor Driver
SEATING
PLANE
2.65 MAX
10.30±0.33
C
load supply voltage. See also the Current Sensing and Thermal
Considerations sections, above.
Fixed Off-Time Selection.
switching losses will decrease, low-level load current regulation
will improve, EMI will be reduced, the PWM frequency will
decrease, and ripple current will increase. The value of t
be chosen for optimization of these parameters. For applications
where audible noise is a concern, typical values of t
chosen to be in the range of 15 to 35 μs.
GAUGE PLANE
4° ±4
0.25
0.84
A Terminal #1 mark area
SEATING PLANE
B
0.27
Reference pad layout (reference IPC SOIC127P1030X265-20M)
All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary
to meet application process requirements and PCB layout tolerances
+0.44
–0.43
+0.07
–0.06
2.25
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Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
With increasing values of t
20
1
2
B
PCB Layout Reference View
0.65
OFF
OFF
are
OFF
1.27
9.50
,
can
7