2-Phase Stepper Motor Bipolar Driver ICs (2-Phase/1-2 Phase Excitation)
A3953SB/SLB
sDerating
sInternal
Block Diagram
LOAD
SUPPLY
LOGIC
6
SUPPLY
V
CC
SLEEP &
STANDBY MODES
Allowable package power dissipation P
D
(W)
3.0
9
10
15
A3
9
2.5
53
SB
MODE 14
43
2.0
C
°
PHASE
7
UVLO
& TSD
V
BB
A3
/W
8
1.5
LB
67
C
°
ENABLE
/W
BRAKE 1
1.0
INPUT LOGIC
95
3S
Q
0
−20
BLANKING
S
RC
3
+
2
REF
C
T
R
T
V
TH
12
0
25
50
75 85
100
GROUND
4
5
V
CC
Ambient temperature Ta (C°)
sTruth
Table
BRAKE
H
H
H
H
H
H
L
L
ENABLE
H
H
L
L
L
L
X
X
PHASE
X
MODE
H
L
H
L
H
L
H
L
OUT
A
Z
Z
H
H
L
L
L
L
OUT
B
Z
Z
L
L
H
H
L
L
Operating Mode
Sleep mode
Standby
Forward, fast current-decay mode
Forward, slow current-decay mode
Reverse, fast current-decay mode
Reverse, slow current-decay mode
Brake, fast current-decay mode
Brake, no current control
X
H
H
L
L
X
X
X : Don't Care
Z : High impedance
sApplication
Circuit
(A3953SB)
BRAKE
REF
+5 V
(DC motor drive)
1
2
3
16
15
14
13
LOGIC
5
6
V
CC
12
11
10
V
BB
9
V
BB
V
BB
47
µ
F
MODE
680 pF
30 kΩ
4
0.5
PHASE
ENABLE
7
8
Off-time setting
t
OFF≅
R
T•
C
T
R
T=
12k to 100kΩ
C
T=
470 to 1500pF (Operating at V
CC=
5V)
C
T=
680 to 1500pF (Operating at V
CC=
3.3V)
sExternal
Dimensions
A3953SB
Plastic DIP (300mil)
16
7.11
6.10
1
2
3
8
0.127MIN
2.54BSC
21.33
18.93
5.33MAX
SEATING PLANE
q
Thickness of lead is measured
below seating plane.
q
Allowable variation in distance between
leads is not cumulative.
Note 1: Lead width of pin 1, 8, 9, 16 may be
2: half the value shown here.
Maximum thickness of lead is 0.508mm.
A3953SLB
ICs per stick
0.381
0.204
25
(16-pin wide SOIC)
16
ICs per stick
9
47
0.32
0.23
9
*1
7.62BSC
7.60
7.40
10.65
10.00
1.27
0.40
INDEX AREA
1.77
1.15
0.51
0.33
2.65
2.35
1
10.50
10.10
SEATING PLANE
8
1.27
BSC
0° TO 8°
q
Pin material: copper,
pin surface treatment: solder plating
q
Package index may be *1.
q
Allowable variation in distance between
leads is not cumulative.
q
Web (batwing) type lead frames are used for
pin 4, 5, 12, 13. The pins are connected to GND.
0.558
0.356
0.39MIN
4.06
2.93
0.10 MIN.
62
A3953SB/SLB
0.5
R
+
PWM LATCH
LOAD
SUPPLY
16
11
SENSE
R
S
13
GROUND
OUT
A
OUT
B
+
(Unit: mm)
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