EN7231 D

Ordering number : EN7231
LB1937T
Monolithic Digital IC
1-2 Phase Excitation
Stepping Motor Driver
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Overview
The LB1937T is a 2-phase bipolar drive stepping motor driver IC that supports low-voltage drive and can drive two
stepping motors at the same time. The LB1937T's miniature package and minimal number of external components
reduces the required mounting area. It also provides high-efficiency motor drive and can reduce circuit current
consumption. Since it provides a current detection pin and supports PWM control input, it can be used to implement
current chopper control at the system level. The LB1937T is optimal for the stepping motors used for lens drive in
digital cameras, printers, and movie cameras.
Functions and Features
• Low saturation voltage forward/reverse motor driver (VO sat = 0.3V at IO = 200mA)
• Four H-bridge channels
• Wide usable voltage range (Allowable voltage range: 2.5V to 9.5V, absolute maximum rating: 10.5V)
• Supports PWM input (Low power consumption can be achieved in slow delay mode that uses IN1/IN2 = H/H logic.)
• Motor (coil) current detection pin
• Built-in thermal shutdown circuit
• Thin form factor miniature package (TSSOP24)
Semiconductor Components Industries, LLC, 2013
June, 2013
32207 TI PC B8-5899,7386 No.7231-1/7
LB1937T
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Maximum output voltage
Input voltage
Ground pin source current
Allowable power dissipation
Symbol
Conditions
Ratings
Unit
VCC max
-0.3 to +10.5
VS max
-0.3 to +10.5
V
VS+ VSF
V
VOUT max
VIN max
IGND max
Pd max
-0.3 to +8.0
Per channel
When mounted on a circuit board *
V
V
800
mA
1100
mW
Operating temperature
Topr
-30 to +85
°C
Storage temperature
Tstg
-40 to +150
°C
* Specified circuit board : 114.3 × 76.1 × 1.6mm3, glass epoxy
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Allowable Operating Range at Ta = 25°C
Parameter
Supply voltage
Symbol
Conditions
Ratings
Unit
VCC
2.5 to 9.5
VS
2.5 to 9.5
V
High-level input voltage
VIH
2.0 to 7.5
V
Low-level input voltage
VIL
-0.3 to 0.7
V
Electrical Characteristics at Ta = 25°C, VCC = VS = 5V
Parameter
VCC system power supply
current
VS system power supply current
Output saturation voltage
Input current
Symbol
ICC0
Conditions
IN1 to IN8 = 0V
Ratings
min
typ
Unit
max
0.1
5
μA
16
mA
ICC1
IN1 = IN3 = 3V
10
IS0
IN1 to IN8 = 0V
0.1
5
μA
IS1
IN1 = IN3 = 3V
13
19
mA
VOUT1
VCC = VS = 3V to 7.5V, VIN = 3V or 0V,
IOUT = 200mA (High and low side)
0.3
0.4
V
VOUT2
VCC = VS = 4V to 7.5V, VIN = 3V or 0V,
IOUT = 400mA (High and low side)
0.6
0.8
V
VIN = 5V
150
200
μA
30
μA
1.7
V
IIN
Spark killer diode
Reverse current
IS(leak)
Forward voltage
VSF
IOUT = 400mA
No.7231-2/7
LB1937T
Package Dimensions
unit:mm (typ)
3260A
Allowable power dissipation, Pd max – mW
Pd max – Ta
6.5
0.5
6.4
13
4.4
24
12
1
0.5
0.15
0.22
1.2max
(1.0)
(0.5)
1200
1100
Mounted on the specified circuit board
1000
800
572.00
600
400
200
Specified circuit board : 114.3 × 76.1 × 1.6mm3
glass epoxy board
0
-40 -30 -20
0
20
40
60
80
100
0.08
Ambient temperature, Ta – °C
SANYO : TSSOP24(225mil)
Pin Assignment
VS
1
24
P-GND
V CC
2
23
(NC)
IN1
3
22
OUT1
IN2
4
21 OUT2
IN3
5
20 OUT3
IN4
6
19 OUT4
S -GND
7
18 P-GND
IN5
8
17
IN6
9
16 OUT6
IN7
10
15
OUT7
IN8 11
14
OUT8
VS 12
13
P-GND
LB1937T
OUT5
Top view
No.7231-3/7
LB1937T
Block Diagram
VCC
10μF
VS
30kΩ
OUT1
IN1
Stepping
Motor
10μF
30kΩ
OUT2
IN2
30kΩ
30kΩ
30kΩ
IN3
30kΩ
OUT3
30kΩ
30kΩ
IN5
30kΩ
OUT4
Control block
IN4
30kΩ
VS
OUT5
IN6
30kΩ
Stepping
Motor
30kΩ
OUT6
30kΩ
IN7
IN8
30kΩ
30kΩ
Thermal shutdown
30kΩ
OUT7
OUT8
S-GND
P-GND
LB1937T
P-GND
Top view
No.7231-4/7
LB1937T
Truth Table
Input
IN1
IN2
L
IN3
IN4
IN5
Output
IN6
IN7
IN8
OUT3
OUT4
Output
OUT5
OUT6
OUT7
OUT8
mode
OUT1
OUT2
L
off
off
(1)
L
H
L
H
(2)
H
L
H
L
(3)
H
H
off
H
(4)
(*)
(*)
H
off
(4)′
L
L
off
off
(5)
L
H
L
H
(6)
H
L
H
L
(7)
H
H
off
H
(8)
(*)
(*)
H
off
(8)′
L
L
off
off
(11)
L
H
L
H
(12)
H
L
H
L
(13)
H
H
off
H
(14)
(*)
(*)
H
off
(14)′
L
L
off
off
(15)
L
H
L
H
(16)
H
L
H
L
(17)
H
H
off
H
(18)
(*)
(*)
H
off
(18)′
L : low, H : high
*:
The output logic mode when IN1/IN2 = H/H is determined by the immediately preceding IN1/IN2 mode.
The post-switching output modes will be as follows.
When switching from (2): (4)
When switching from (3): (4)'
When switching from (1): Undefined (Either (4) or (4)')
The modes when IN3/IN4 = H/H operate similarly as described below.
When switching from (6): (8)
When switching from (7): (8)'
When switching from (5): Undefined (Either (8) or (8)')
No.7231-5/7
LB1937T
ICC -- VCC
15
10
5
0
0
1
2
3
4
5
IS -- VS
20
Supply current, IS – mA
Supply current, ICC – mA
20
6
7
8
9
15
10
5
0
10
0
1
2
3
Supply voltage, VCC – V
IIN -- VIN
200
150
8
1
to
IN
IN
100
50
0
0
1
2
3
5
6
7
8
8
9
10
e
ow
dl
gh
Hi
0.25
100
0
sid
an
200
300
400
500
IS -- Ta
15.0
12.5
Supply current, Is – mA
15
10
5
10.0
7.5
5.0
2.5
-40
-20
0
20
40
60
80
100
120
140
Ambient temperature, Ta – °C
Output saturation voltage, VO(sat) – V
7
Output current, IO – mA
20
0
6
0.50
0
9
ICC -- Ta
25
Supply current, ICC – mA
4
Input voltage, VIN – V
5
VO(sat) -- IO
0.75
Output saturation voltage, VO(sat) – V
Input current, IIN – μA
250
4
Supply voltage, VS – V
-40
-20
0
20
40
60
80
100
120
140
Ambient temperature, Ta – °C
VO(sat) -- Ta
0.7
0
High and low side
0.6
0.5
0.4
0.3
0.2
-40
-20
0
20
40
60
80
100
120
140
Ambient temperature, Ta – °C
No.7231-6/7
LB1937T
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PS No.7231-7/7
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