2-Phase/1-2 Phase Excitation
A3966SA/SLB
Allegro MicroSystems product
2-Phase Stepper Motor Bipolar Driver IC
sFeatures
q
Maximum output ratings: 30V,
±650mA
q
Internal fixed-frequency PWM current con-
trol
q
Internal ground-clamp & flyback diodes
q
Internal thermal shutdown, crossover-cur-
rent protection and UVLO protection cir-
cuitry
q
Employs copper batwing lead frame with
low thermal resistance
sAbsolute
Maximum Ratings
Parameter
Load supply voltage
Output current (peak)
Output current (continuous)
Logic supply voltage
Logic input voltage range
Sense voltage
Package power dissipation
Ambient operating temperature
Junction temperature
Storage temperature
Symbol
V
BB
I
O
(Peak)
I
O
V
CC
V
IN
V
S
P
D (Note1)
T
a
T
j (Note2)
Ratings
A3966SA
30
±750
±650
7.0
−0.3
to V
CC
+0.3
1.0
2.08
−20
to +85
+150
−55
to +150
1.86
A3966SLB
Units
V
mA
mA
V
V
V
W
°C
°C
°C
T
stg
qOutput
current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any
set of conditions, do not exceed the specified current rating or a junction temperature of 150°C.
Note 1: When ambient temperature is 25°C or over, derate using
−16.67mW/°C
(SA),
−14.93mW/°C
(SLB).
Note 2: Fault conditions where junction temperature (T
j
) exceeds 150°C will activate the device's thermal
shutdown circuitry. These conditions can be tolerated but should be avoided.
sElectrical
Characteristics
Parameter
Power outputs (OUT
A
or OUT
B
)
Load supply voltage range
Output leakage current
(Unless specified otherwise, T
a
=25°C, V
BB
=30V, V
CC
=4.75V to 5.5V, V
REF
=2V, V
S
= 0V, 56kΩ & 680pF RC to ground)
Symbol
Conditions
min
V
CC
< 1.0
<
−1.0
1.7
1.8
0.3
0.4
18
1.1
1.4
3.0
< 1.0
Ratings
typ
max
30
50
−50
2.0
2.1
0.5
1.3
24
1.4
1.6
5.0
200
5.50
0.8
20
−200
2.0
1.0
4.2
6.0
1.0
27.9
1.4
1.2
3.0
Units
V
BB
I
CEX
Operating, I
O
=±650mA, L=3mH
V
O
=30V
V
O
=0V
Source Driver, I
O
=−400mA
Source Driver, I
O
=−650mA
Sink Driver, I
O
=+400mA, V
SENSE
=0.5V
Sink Driver, I
O
=+650mA, V
SENSE
=0.5V
I
S
−I
O
, I
O
=50~650mA
I
F
=400mA
I
F
=650mA
V
ENABLE1
=V
ENABLE2
=0.8V
V
ENABLE1
=V
ENABLE2
=2.4V
Operating
Output saturation voltage
V
CE
(sat)
Sense-current offset
Clamp diode forward voltage
Motor supply current (No load)
Control logic
Logic supply voltage range
Logic input voltage
Logic input current
I
SO
V
F
I
BB
(ON)
I
BB
(OFF)
V
CC
V
IH
V
IL
I
IH
12
V
µ
A
µ
A
V
V
V
V
mA
V
V
mA
µ
A
V
V
V
µ
A
µ
A
V
µ
A
mV
V
kHz
µ
S
µ
S
µ
S
ns
ns
ns
ns
ns
ns
ns
ns
°C
°C
V
V
mA
mA
4.75
2.4
< 1.0
<
−20
0.1
−2.5
3.8
−6.0
−0.3
22.9
0
4.0
0
25.4
1.0
0.8
1.8
100
500
200
200
2200
200
2200
200
165
15
4.1
0.6
I
IL
Reference input voltage range
V
REF
Reference input current
I
REF
Reference divider ratio
V
REF
/V
TRIP
Current-sense comparator input offset voltage
V
IO
Current-sense comparator input voltage range
V
S
PWM RC frequency
f
OSC
PWM propagation delay time
Cross-over dead time
t
PWM
t
codt
V
IN
=2.4V
V
IN
=0.8V
Operating
Propagation delay time
t
pd
V
REF
=0V
Operating
C
T
=680pF, R
T
=56kΩ
Comparator Trip to Source OFF
Cycle Reset to Source ON
1kΩ Load to 25V
I
O
=±650mA, 50% to 90% : ENABLE ON to Source ON
I
O
=±650mA, 50% to 90% : ENABLE OFF to Source OFF
I
O
=±650mA, 50% to 90% : ENABLE ON to Sink ON
I
O
=±650mA, 50% to 90% : ENABLE OFF to Sink OFF
I
O
=±650mA, 50% to 90% : PHASE Change to Sink ON
I
O
=±650mA, 50% to 90% : PHASE Change to Sink OFF
I
O
=±650mA, 50% to 90% : PHASE Change to Source ON
I
O
=±650mA, 50% to 90% : PHASE Change to Source OFF
0.2
Thermal shutdown temperature
Thermal shutdown hysteresis
UVLO enable threshold
UVLO hysteresis
Logic supply current
q
"typ" values are for reference.
T
j
T
j
V
UVLO en
V
UVLO hys
I
CC
(ON)
I
CC
(OFF)
Increasing V
CC
0.1
V
ENABLE1
=V
ENABLE2
=0.8V
V
ENABLE1
=V
ENABLE2
=2.4V
4.6
50
9
54
A3966SA/SLB
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