Page 1
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
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)
SANYO : MFP14S
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
V
max –0.3 to +10.5 V
Maximum supply voltage
Output applied voltage V
Input applied voltage V
Ground pin flow-out current IGND Per channel 1.0 A
Allowable power dissipation
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +125 °C
CC
V
max –0.3 to +10.5 V
S
OUT
IN
Pd max1 Independent IC 550 mW
Pd max2 * With board 800 mW
VS+V
SF
–0.3 to +10 V
V
*Note: Mounted on 20 × 30 × 1.5 mm3glass epoxy PCB
Allowable Operating Ranges at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Supply voltage
Input high-level voltage V
Input low-level voltage V
V
CC
V
S
IH
IL
2.5 to 9.0 V
1.8 to 9.0 V
1.8 to 9.0 V
–0.3 to +0.7 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
Page 2
LB1838M
Electrical Characteristics at Ta = 25°C, VCC=3V
Parameter Symbol Conditions min typ max Unit
Supply current 1 I
Supply current 2 I
Output saturation voltage
Input current 1 I
Input current 2 I
Output sustaining voltage V
Spark killer diode reverse
current
Spark killer diode forward
voltage
Pin Assignment
0 ENA1,2=0V,VIN1=3Vor0V 0.1 10 µA
CC
1 ENA1=3V,VIN1=3Vor0V 12 18 mA
CC
V
1 ENA=3V,VIN=3Vor0V,I
OUT
V
2 ENA=3V,VIN=3Vor0V,I
OUT
IN
ENA
(sus) I
O
Is (leak) V
V
SF
VCC=6V,VIN= 6 V 200 µA
VCC= 6 V, ENA = 6 V 200 µA
= 400 mA 9 V
OUT
1, VS= 7 V 30 µA
CC
I
= 400 mA 1.7 V
OUT
= 200 mA 0.2 0.28 V
OUT
= 400 mA 0.4 0.6 V
OUT
Note: Both GND pins should be connected to ground.
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
No.3949-2/4
Page 3
Block Diagram
LB1838M
60kΩ
80kΩ
60kΩ
80kΩ
Control
Thermal
shutdown
60kΩ
80kΩ
60kΩ
80kΩ
Control
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. V
=3V,VS1,2=2V,ENA=IN=5V)
CC
Vcont pin
(= constant)
As shown in the above diagram, the Vcont pin outputs the voltage of the band gap Zener V
In normal use, this pin is left open.
The drive current I
is varied by the Vcont voltage. However, because the band gap Zener is shared, it functions as a bridge.
D
Z+VF
(= 1.93 V).
No.3949-3/4
Page 4
Specified board (30 × 30 × 1.5 mm3glass epoxy )
LB1838M
(sat) − V
O
Allowable power dissipation, Pd max − mW
–µA
Input current, I
–mA
Output saturation voltage, V
Ambient temperature, Ta − °C
I
IN–VIN
Output current, IO−mA
VO(sat) – Ta
value
(sat) – V
O
IN
Output saturation voltage, V
Input voltage, VIN–V
IS–V
S
For 1 channel
Ambient temperature, Ta – °C
ICC–V
CC
For 1 channel
–mA
S
CC
Reverse
Forward
Current drain, I
Supply voltage, VS–V
No products described or contained herein are intended for useinsurgicalimplants, 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.
Current drain, I
Supply voltage, VCC–V
No.3949-4/4
Loading...