The LB1848MC is 2-channel low-voltage, low saturation voltage type bidirectional motor driver IC that is optimal for
use as 2-phase stepping motor drivers in printers, cameras and other portable equipment. The output circuits are of the
bipolar type, with PNP transistors in the upper side and NPN transistors in the lower side, and they achieve low
saturation output and low power characteristics despite being provided in a miniature package.
The LB1848MC products can directly control a motor from signals from a microcontroller. The LB1848MC is optimal
for 2-phase excitation drive for 2-phase stepping motors using 3-input logic (ENA, IN1 and IN2).
Another point is that these IC include built-in thermal shutdown circuits so that IC scorching or burning is prevented in
advance even if the IC output is shorted.
Functions
•
Optimal for 2-phase excitation drive for 2-phase stepping motors
•
Standby current: Zero
•
Low saturation voltage. VO (sat) = 0.55V typical at IO = 400mA
•
Thermal shutdown circuit
•
Through-current prevention circuit
•
No limitations on the magnitude relationship between the power supply voltage (VCC) and the input voltage (VIN)
•
“Soft off” function that reduces power supply line noise when switching from drive to standby modes. (Requires the
use of one external capacitor.)
Specifications
Absolute Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Output voltage
Input voltage
Ground pin outflow current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
VOUT
VIN
IGND
Pd max
Topr
Tstg
Per channel
When mounted*
Conditions
Ratings
-0.3 to +8.0
VCC + VSF
-0.3 to +8.0
800
820
-20 to +85
-40 to +150
Unit
V
V
V
mA
mW
°C
°C
*1: When mounted on the specified printed circuit board (114.3mm × 76.2mm × 1.5mm), glass epoxy board
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
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.
Semiconductor Components Industries, LLC, 2013
June, 2013
53012 SY 20120522-S00002/41812 SY/32112 SY 20120229-S00010 No.A2036-1/6
LB1848MC
Allowable Operating Ranges
at Ta = 25°C
Parameter
Supply voltage
Input high-level voltage
Input low-level voltage
VIH
VIL
Symbol
VCC
Conditions
Ratings
2.5 to 7.5
2.5 to 7.5
-0.3 to +0.7
Unit
V
V
V
Electrical Characteristics
at Ta
=
25°C, VCC = 5V
Parameter
Current drain
Symbol
ICC0
ICC1
Output saturation voltage
VOUT1
VOUT2
Input current
IIN
IENA
Spark Killer Diode
Reverse current
Forward voltage
IS (leak)
VSF
IOUT = 400mA
-
-
-
-
30
1.7
µA
V
Conditions
ENA = 0V, VIN = 3V or 0V
ENA = 3V, VIN = 3V or 0V
ENA = 3V, VIN = 3V or 0V, VCC = 3 to 7.5V,
IOUT = 200mA
ENA = 3V, VIN = 3V or 0V, VCC = 4 to 7.5V,
IOUT = 400mA
VIN = 5V
ENA = 5V
Ratings
min
-
-
-
-
-
-
typ
0.1
25
0.27
0.55
75
85
max
10
35
0.4
0.8
100
110
Unit
µA
mA
V
V
µA
µA
Package Dimensions
unit : mm (typ)
3426A
4.9
10
6
1000
Pd max -- Ta
Allowable power dissipation, Pdmax - mW
3.9
6.0
820
800
0.37
0.835
600
1
1.0
5
0.41
1.75 MAX
0.21
400
427
200
1.5
0.175
0
--20
0
20
40
60
80
100
SANYO : SOIC10
Ambient temperature, Ta - C
No.A2036-2/6
LB1848MC
Pin Assignment
VCC
IN2
ENA
SOF
IN1
1
2
3
4
5
Top view
10 OUT4
9
OUT3
OUT1
OUT2
GND
LB1848MC
8
7
6
Block Diagram
VCC
IN1
OUT1
Stepping
Motor
OUT2
IN2
Control block
ENA
Thermal shutdown circuit
OUT3
OUT4
GND
SOF*
102 to 103
Note: When the “soft off” function is used, a capacitor must be connected to the SOF pin. IF this function is not used, this pin must be left open with absolutely
no signals or lines connect.
Truth Tables
ENA
L
IN1
-
L
H
L
H
H
IN2
-
L
H
H
L
OUT1
OFF
H
H
L
L
OUT2
OFF
L
L
H
H
OUT3
OFF
H
L
L
H
OUT4
OFF
L
H
H
L
Note: *1 "-" indicates a "don‛t care" input.
No.A2036-3/6
LB1848MC
SOF pin (“Soft off” function) operation
The soft off function reduces power supply line noise due to the kickback current generated when the stepping motor
drive mode is switched from drive to standby. The “soft off” function provided by this IC operates when a capacitor
(0.001 to 0.01µF) is connected between the SOF pin and ground. (Leave the SOF pin open to disable the soft off
function.)
The waveforms for each pin are shown below.
ENA
IN1
IN2
OUT1
OUT2
OUT3
OUT4
No kickback noise
VCC
SOF
No.A2036-4/6
LB1848MC
(Cautions)
Pay attention to following two points in an application where the capacitor to GND is connected to the SOF pin:
(1) Sudden startup of VCC power supply causes charging of the capacitor from the IC inside via the SOF pin at startup.
During charging, the state equivalent to the one with the ENA input at
“H”
occurs, causing output of the corresponding
logic to the output pin, which may result in driving of the load. (The output time period is dependent on the capacity
of capacitor; about 2 ms for 0.01μF.)
(2) To transfer from the drive mode to the standby mode by changing the ENA input from “H” to “L”, the capacitor is
charged from the IC inside via the SOF pin as in the case of above (1). During this charge period, the ENA input keeps
the “H” condition in IC. By changing IN1/IN2 input at this time point, the output can be changed. (The time period is
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