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.
Features
.
Low voltage operation (2.5 V min)
.
Low saturation voltage (upper transistor + lower transistor
residual voltage; 0.40 V at 400 mA).
.
Through-current prevention circuit built in
.
Separate logic power supply and motor power supply
.
Spark killer diodes built in
.
Thermal shutdown circuit built in
.
Compact package (14-pin MFP)
Package Dimensions
unit : mm
3111-MFP14S
[LB1838M]
SANYO : MFP14S
Specifications
Absolute Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
0.3 to +10.5
V
V
S
max
0.3 to +10.5
V
Output applied voltage
V
OUT
V
S
+ V
SF
V
Input applied voltage
V
IN
0.3 to +10
V
Ground pin flow-out current
IGND
Per channel
1.0
A
Allowable power dissipation
Pd max1
Independent IC
550
mW
Pd max2
*
With board
800
mW
Operating temperature
Topr
20 to +75
C
Storage temperature
Tstg
40 to +125
C
*Note: Mounted on 20
30
1.5 mm
3
glass epoxy PCB
Allowable Operating Ranges
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
V
CC
2.5 to 9.0
V
V
S
1.8 to 9.0
V
Input high-level voltage
V
IH
1.8 to 9.0
V
Input low-level voltage
V
IL
0.3 to +0.7
V
Ordering number: EN3949C
Monolithic Digital IC
LB1838M
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
Electrical Characteristics
at Ta = 25C, V
CC
= 3 V
Parameter
Symbol
Conditions
min
typ
max
Unit
Supply current 1
I
CC
0
ENA1, 2 = 0 V, V
IN
1 = 3 V or 0 V
0.1
10
A
Supply current 2
I
CC
1
ENA1 = 3 V, V
IN
1 = 3 V or 0 V
12
18
mA
Output saturation voltage
V
OUT
1
ENA = 3 V, V
IN
=3 V or 0 V, I
OUT
= 200 mA
0.2
0.28
V
V
OUT
2
ENA = 3 V, V
IN
= 3 V or 0 V, I
OUT
= 400 mA
0.4
0.6
V
Input current 1
I
IN
V
CC
= 6 V, V
IN
= 6 V
200
A
Input current 2
I
ENA
V
CC
= 6 V, ENA = 6 V
200
A
Output sustaining voltage
V
O
(sus)
I
OUT
= 400 mA
9
V
Spark killer diode reverse
current
Is (leak)
V
CC
1, V
S
= 7 V
30
A
Spark killer diode forward
voltage
V
SF
I
OUT
= 400 mA
1.7
V
Pin Assignment
Truth Table
IN 1, 2
ENA 1, 2
OUT 1, 3
OUT 2, 4
Mode
L
H
H
L
Forward
H
H
L
H
Reverse
L
L
OFF
OFF
Standby
H
L
OFF
OFF
Standby
Note: Both GND pins should be connected to ground.
LB1838M
No.3949-2/4
Block Diagram
Vcont pin
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.
Control
Thermal
shutdown
Control
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)
60k
80k
60k
80k
60k
80k
60k
80k
(= constant)
LB1838M
No.3949-3/4
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.
Allowable
power
dissipation,
Pd
max
-
m
W
Ambient temperature, Ta - C
Specified board (30
30
1.5 mm
3
glass epoxy )
Output
saturation
voltage,
V
O
(sat)
-
V
Output current, I
O
- mA
Input
current,
I
IN
A
Input voltage, V
IN
V
Output
saturation
voltage,
V
O
(sat)
V
Ambient temperature, Ta C
I
IN
V
IN
V
O
(sat) Ta
value
I
S
V
S
I
CC
V
CC
Current
drain,
I
S
m
A
Supply voltage, V
S
V
Current
drain,
I
CC
m
A
Supply voltage, V
CC
V
For 1 channel
For 1 channel
Reverse
Forward
LB1838M
No.3949-4/4
PDF 
ZIP