2-Phase/1-2 Phase Excitation
A3952SB/SLB/SW
Allegro MicroSystems product
2-Phase Stepper Motor Bipolar Driver ICs
sFeatures
q
Fixed off-time PWM current control
q
Switching between power supply regenera-
tion mode and loop regeneration mode in
order to improve motor current response in
microstepping
q
External filter for sense terminal not required
q
Sleep (low current consumption) mode
q
Brake operation with PWM current limiting
q
Internal thermal shutdown circuitry
q
Internal crossover-current protection circuitry
q
Internal UVLO protection
q
Internal transient-suppression diodes
q
Low thermal resistance package
sAbsolute
Maximum Ratings
Parameter
Load supply voltage
Output current (peak)
Output current (continuous)
Logic supply voltage
Logic input voltage
Sense voltage
Reference voltage
Package power dissipation
Operating temperature
Junction temperature
Storage temperature
Symbol
V
BB
I
O (Peak)
I
O
V
CC
V
IN
V
SENSE
V
REF
P
D (Note1)
T
a
T
j (Note2)
T
stg
2.90
Conditions
Ratings
A3952SB A3952SLB A3952SW
50
±3.5
±2.0
7.0
−0.3
to V
CC
+0.3
1.5
15
1.86
−20
to +85
+150
−55
to +150
3.47
Units
V
A
A
V
V
V
V
W
°C
°C
°C
tw≤20
µ
s
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
−23.26mW/°C(SB), −14.93mW/°C(SLB)
or
−27.78mW/°C(SW).
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
Load supply voltage range
Output leakage current
(Unless specified otherwise, T
a
=25°C, V
BB
=50V, VC
C
=5.0V, V
BRAKE
=2.0V, V
SENSE
= 0V, 20kΩ & 1000pF RC to ground)
Symbol
Conditions
Limits
min
V
CC
<1.0
<
−1.0
0.9
1.0
1.2
0.9
1.0
1.3
1.0
1.1
1.4
2.9
3.1
3.1
<1.0
4.5
2.0
5.0
typ
max
50
50
−50
1.2
1.4
1.8
1.2
1.4
1.8
1.4
1.6
2.0
6.0
6.5
6.5
50
5.5
0.8
20
−200
15
55
10.5
±10
22
3.0
3.8
Units
V
BB
I
CEX
Output saturation voltage
V
CE (SAT)
Clamp diode forward voltage
(Source or sink)
Load supply current
(No load)
Control logic
Logic supply voltage range
Logic input voltage
Logic input current
Reference voltage range
Reference input current
Reference voltage divider ratio
Comparator input offset voltage
PWM RC fixed off-time
PWM minimum on-time
V
F
I
BB (ON)
I
BB (OFF)
I
BB (BRAKE)
I
BB (SLEEP)
V
CC
V
IH
V
IL
I
IH
I
IL
V
REF
I
REF
V
IO
t
off
t
on (min)
Operating, I
O
=±2.0A, L=3mH
V
O
=V
BB
V
O
=0V
Source driver, I
O
=−0.5A
Source driver, I
O
=−1.0A
Source driver, I
O
=−2.0A
Sink driver, I
O
=+0.5A
Sink driver, I
O
=+1.0A
Sink driver, I
O
=+2.0A
I
F
=0.5A
I
F
=1.0A
I
F
=2.0A
V
ENABLE
=0.8V, V
BRAKE
=2.0V
V
ENABLE
=2.0V, V
MODE
=0.8V, V
BRAKE
=2.0V
V
BRAKE
=2.0V
V
ENABLE
=V
MODE
=V
BRAKE
=2.0V
Operating
V
µ
A
µ
A
V
V
V
V
V
V
V
V
V
mA
mA
mA
µ
A
V
V
V
µ
A
µ
A
V
µ
A
mV
µ
s
µ
s
µ
s
Propagation delay time
t
pd
Thermal shutdown temperature
Thermal shutdown hysteresis
UVLO enable threshold
UVLO hysteresis
Logic supply current
(No load)
q“typ”
values are for reference.
t
pd (PWM)
T
j
∆T
j
V
CC (UVLO)
∆V
CC (UVLO)
I
CC (ON)
I
CC (OFF)
I
CC (BRAKE)
I
CC (SLEEP)
V
IH
=2.0V
V
IL
=0.8V
Operating
V
REF
=2.0V
V
REF
=15V
V
REF
=0V
C
T
=1000pF, R
T
=20kΩ
C
T
=820pF, R
T
≥12kΩ
C
T
=1200pF, R
T
≥12kΩ
I
OUT
=±2.0A, 50% E
IN
to 90% E
out
Transition:
ENABLE ON to SOURCE ON
ENABLE OFF to SOURCE OFF
ENABLE ON to SINK ON
ENABLE OFF to SINK OFF
PHASE CHANGE to SOURCE ON
PHASE CHANGE to SOURCE OFF
PHASE CHANGE to SINK ON
PHASE CHANGE to SINK OFF
Comparator Trip to SINK OFF
<1.0
<
−2.0
0
25
9.5
18
40
10.0
±1.0
20
1.7
2.5
2.9
0.7
2.4
0.7
2.9
0.7
2.4
0.7
0.8
165
15
3.50
400
20
12
26
3.0
1.5
3.15
300
V
ENABLE
=0.8V, V
BRAKE
=2.0V
V
ENABLE
=2.0V, V
MODE
=0.8V, V
BRAKE
=2.0V
V
BRAKE
=0.8V
V
ENABLE
=V
MODE
=V
BRAKE
=2.0V
3.85
500
30
18
40
5.0
µ
s
µ
s
µ
s
µ
s
µ
s
µ
s
µ
s
µ
s
µ
s
°C
°C
V
mV
mA
mA
mA
mA
70
A3952SB/SLB/SW
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