A3964SB Allegro Microsystems Inc, A3964SB Datasheet - Page 2

• 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

Features and Benefits
▪ ±800 mA continuous output current rating
▪ 30 V output voltage rating
▪ Internal PWM current control, saturated sink drivers
▪ Internally generated, precision 2.5 V reference
▪ Internal transient-suppression diodes
▪ Internal thermal-shutdown circuitry
▪ Crossover-current protection, UVLO protection
Package: 20 pin SOIC (suffix LB)
29319.28h
Not to scale
ENABLE 1
PHASE 1
R T
10
9
ONE SHOT
SOURCE
DISABLE
8
C T
V
17
CC
+
–
2
3
REFERENCE
Functional Block Diagram
1
2.5 V
14
Dual Full-Bridge PWM Motor Driver
1
R A
R S
7
V
V
REF(IN)
BB
4
R B
Description
Designed for pulse width modulated (PWM) current control
of bipolar stepper motors, the A3964 is capable of continuous
output currents to ±800 mA and operating voltages to 30 V.
Internal fixed off-time PWM current-control circuitry can be
used to regulate the maximum load current to a desired value.
An internal precision voltage reference is provided to improve
motor peak-current control accuracy. The peak load current
limit is set by the user’s selection of an external resistor divider
and current-sensing resistors.
The fixed off-time pulse duration is set by user-selected
external RC timing networks. The capacitor in the RC timing
network also determines a user-selectable blanking window
that prevents false triggering of the PWM current control
circuitry during switching transitions. This eliminates the need
for two external RC filter networks on the current-sensing
comparator inputs.
For each bridge the PHASE input controls load current polarity
by selecting the appropriate source and sink driver pair. For
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5
6 15 16
18
2
R S
20
19
–
+
ONE SHOT
C T
& TSD
UVLO
SOURCE
DISABLE
13
12
11
Dwg. FP-033-1
ENABLE 2
PHASE 2
R T
A3964