The LB1838M is a low-saturation two-channel bidirectional motor driver IC for use in low-voltage applications.
The LB1838M is a bipolar stepper-motor driver IC that is ideal for use in printers, cameras and other portable devices.
Functions
•
Low voltage operation (2.5V min)
•
Low saturation voltage (upper transistor + lower transistor residual voltage: 0.40V at 400mA)
•
Built-in through-current prevention circuit
•
Separate logic power supply and motor power supply
•
Built-in spark killer diodes
•
Built-in thermal shutdown circuit
•
Compact package: MFP14S
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Symbol
VCC max
VS max
Output applied voltage
Input applied voltage
Ground pin flow-out current
Allowable power dissipation
VOUT
VIN
IGND
Pd max
Per channel
Independent IC
Mounted on a specified board *
Operating temperature
Storage temperature
Topr
Tstg
Conditions
Ratings
-0.3 to +10.5
-0.3 to +10.5
VS+VSF
-0.3 to +10
1.0
550
800
-20 to +75
-40 to +125
Unit
V
V
V
V
A
mW
mW
°C
°C
* Specified board: 20mm
×
30mm
×
1.6mm, glass epoxy board.
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.
Note: Both GND pins should be connected to ground.
No.3949-2/5
LB1838M
Block Diagram
10μF
VCC
VS2
VS1
Control block
IN1
60kΩ
80kΩ
OUT1
Stepping
Motor
OUT2
ENA1
60kΩ
80kΩ
Thermal
shutdown
IN2
Control block
60kΩ
80kΩ
OUT3
OUT4
ENA2
60kΩ
80kΩ
GND
Vcont
GND
Note: As long as the voltages applied to VCC, VS1, VS2, ENA1, ENA2, IN1, and IN2 are within the limits set by the
absolute maximum ratings, there are no restrictions on the relationship of each voltage level in comparison with the
others (regarding which is higher or lower). (ex. VCC = 3V, VS1, 2 = 2V, ENA = IN = 5V)
Truth Table
IN1,2
L
H
L
H
ENA1,2
H
H
L
L
OUT1,3
H
L
OFF
OFF
OUT2,4
L
H
OFF
OFF
Mode
Forward
Reverse
Standby
Standby
Vcont pin
VCC
VS
OUT
M
300Ω
ID
VZ
OUT
As shown in the left diagram, the Vcont pin outputs the voltage
of the band gap Zener VZ +VF (= 1.93V).
In normal use, this pin is left open.
The drive current ID is varied by the Vcont voltage. However,
because the band gap Zener is shared, it functions as a bridge.
VZ
( = Constant)
r
IN
ID =
Vcont
No.3949-3/5
LB1838M
1.0
VO(sat) -- IO
200
IIN -- VIN
VCC = VS = 3V
Output saturation voltage, VO(sat) -- V
0.8
160
Input current, IIN --
μA
0.6
120
1
IN
(
A
EN
)
V
=3
A
EN
0.4
80
0.2
40
0
0
100
200
300
400
500
600
0
0
1
2
3
4
5
6
7
8
9
10
Output current, IO -- mA
0.6
VO(sat) -- Ta
Input voltage, VIN -- V
20
IS -- VS
Output saturation voltage, VO(sat) -- V
VCC = VS = IN = 3V
VO(sat) = total
0.5
VCC = VIN = 3V
For 1channel
0.4
Current drain, IS -- mA
00mA
IO= 4
16
12
0.3
0.2
I O = 200m
A
8
0.1
4
0
-40
-20
0
20
40
60
80
100
120
140
00
1
2
3
4
5
6
7
8
9
10
11
12
Ambient temperature, Ta --
°C
10
ICC -- VCC
VCC = VIN = 3V
For 1channel
Supply voltage, VS -- V
8
Current drain, ICC -- mA
6
Rev
4
erse
Forward
2
0
0
1
2
3
4
5
6
7
8
9
10
11
12
Supply voltage, VCC -- V
No.3949-4/5
LB1838M
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at
www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no
warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the
application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental
damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical
experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use
as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in
which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for
any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors
harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or
death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the
part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
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