Ordering number: EN3949C
Monolithic Digital IC
LB1838M
Low-saturation, Bidirectional Motor Driver
for Low-voltage Applications
Overview
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, FDDs, cameras and other portable devices.
Package Dimensions
unit : mm
3111-MFP14S
[LB1838M]
Features
.
Low voltage operation (2.5 V min)
.
Low saturation voltage (upper transistor + lower transistor
0.40 V at
.
residual voltage; prevention400 mA). in
built
.
Through-current supplycircuitmotor power supply
.
Separate logic power in and
built
.
Spark killer diodes circuit built in
.
Thermal shutdown(14-pin MFP)
Compact package
SANYO : MFP14S
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Output applied voltage
Input applied voltage
Ground pin flow-out current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
max
V
S
max
V
OUT
V
IN
IGND
Pd max1
Pd max2
Topr
Tstg
Per channel
Independent IC
*
With board
Conditions
Ratings
–0.3 to +10.5
–0.3 to +10.5
V
S
+ V
SF
–0.3 to +10
1.0
550
800
–20 to +75
–40 to +125
Unit
V
V
V
V
A
mW
mW
°C
°C
*Note: Mounted on 20
×
30
×
1.5 mm
3
glass epoxy PCB
Allowable Operating Ranges
at Ta = 25°C
Parameter
Supply voltage
Input high-level voltage
Input low-level voltage
Symbol
V
CC
V
S
V
IH
V
IL
Conditions
Ratings
2.5 to 9.0
1.8 to 9.0
1.8 to 9.0
–0.3 to +0.7
Unit
V
V
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
21097HA(II)/O1596HA(II)/4302TS(US) No.3949-1/4
LB1838M
Electrical Characteristics
at Ta = 25°C, V
CC
= 3 V
Parameter
Supply current 1
Supply current 2
Output saturation voltage
Input current 1
Input current 2
Output sustaining voltage
Spark killer diode reverse
current
Spark killer diode forward
voltage
Symbol
I
CC
0
I
CC
1
V
OUT
1
V
OUT
2
I
IN
I
ENA
V
O
(sus)
Is (leak)
V
SF
Conditions
ENA1, 2 = 0 V, V
IN
1 = 3 V or 0 V
ENA1 = 3 V, V
IN
1 = 3 V or 0 V
ENA = 3 V, V
IN
=3 V or 0 V, I
OUT
= 200 mA
ENA = 3 V, V
IN
= 3 V or 0 V, I
OUT
= 400 mA
V
CC
= 6 V, V
IN
= 6 V
V
CC
= 6 V, ENA = 6 V
I
OUT
= 400 mA
V
CC
1, V
S
= 7 V
I
OUT
= 400 mA
min
typ
0.1
12
0.2
0.4
max
10
18
0.28
0.6
200
200
Unit
µA
mA
V
V
µA
µA
V
µA
V
9
30
1.7
Pin Assignment
Note: Both GND pins should be connected to ground.
Truth Table
IN 1, 2
L
H
L
H
ENA 1, 2
H
H
L
L
OUT 1, 3
H
L
OFF
OFF
OUT 2, 4
L
H
OFF
OFF
Mode
Forward
Reverse
Standby
Standby
No.3949-2/4
LB1838M
Block Diagram
60kΩ
80kΩ
60kΩ
80kΩ
Thermal
shutdown
60kΩ
80kΩ
60kΩ
80kΩ
Note: As long as the voltages applied to V
CC
, V
S
1, V
S
2, 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. V
CC
= 3 V, V
S
1, 2 = 2 V, ENA = IN = 5 V)
Vcont pin
Control
Control
(= constant)
As shown in the above diagram, the Vcont pin outputs the voltage of the band gap Zener V
Z
+V
F
(= 1.93 V).
In normal use, this pin is left open.
The drive current I
D
is varied by the Vcont voltage. However, because the band gap Zener is shared, it functions as a bridge.
No.3949-3/4
LB1838M
Allowable power dissipation, Pd max − mW
Output saturation voltage, V
O
(sat) − V
Specified board (30
×
30
×
1.5 mm
3
glass epoxy )
Ambient temperature, Ta − °C
I
IN
– V
IN
Output saturation voltage, V
O
(sat) – V
Output current, I
O
− mA
V
O
(sat) – Ta
value
Input current, I
IN
– µA
Input voltage, V
IN
– V
I
S
– V
S
For 1 channel
Ambient temperature, Ta – °C
I
CC
– V
CC
For 1 channel
Current drain, I
CC
– mA
Current drain, I
S
– mA
Reverse
Forward
Supply voltage, V
S
– V
Supply voltage, V
CC
– V
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of February, 1997. Specifications and information herein are subject to change without notice.
No.3949-4/4
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