MITSUMI
Electronic Governer for DC Motors LAG674
Electronic Governer for DC Motors
Monolithic IC LAG674
Outline
This is an IC for DC motor electronic governors, developed with emphasis on low-voltage operation; it has
control functions operating at voltages as low as 0.9 V (with performance guaranteed to 1.0 V).
Features
1. Stabilized internal reference voltage generation circuit with a flat temperature characteristic (±100 ppm) and
excellent reduced-voltage characteristics (operation stable down to 0.9 V)
2. Low startup voltage of 0.75 V max.
3. Internal power transistor ensures large startup currents (500 mA-min at 1.0 V using the standard circuit)
4. On/off switching pin provided; on/off control possible at low startup voltages, power supply current while
off is 5µA or less
Package
SOP-8A (LAG674F)
Absolute Maximum Ratings
Item
Operating temperature
Storage temperature
Power supply current
Power consumption
I
Power consumption
II
Operating voltage
Output current
Symbol
T
OPR
T
STG
V
CC
Pd1
Pd2
Vop
IL
1.0
Ratings
-20~+60
-40~+125
7
600
900
5
Units
°
C
°
C
V
mW
mW
V
A
*
1
*
2
*
1:
*
2:
When mounted on a 20 30 0.5 mm printed circuit board (glass-reinforced epoxy).
When Pd exceeds the rated value, the value of Pd takes precedence.
MITSUMI
Electronic Governer for DC Motors LAG674
Electrical Characteristics
Item
Recommended operating
voltage range
Leakage current while off
I
Leakage current while off
II
Power supply current while on
I
Power supply current while on
II
Reference voltage
Reference voltage fluctuation
Output voltage
Reference voltage fluctuation
Pin 7 threshold
Motor ON/OFF SW
Pin 7 input current
I
Pin 7 input current
II
Starting power supply voltage
Startup current
Output saturation voltage
(Except where noted otherwise, Ta=25
°
C)
Measurement
circuit
Symbol
Vccopr
Ileak1
Ileak2
I
CC
1
I
CC
2
Vref
Vref
VM
VM
VTH
I IN1
I IN2
Vccs
IMS
Vosat
K
Measurement conditions
Min. Typ. Max. Units
1.0
5.0
20
5
1.2
1.0
115
-0.5
-5
0.3
0.8
35
0.43
1.6
50
127
1.8
1.5
140
V
µA
µA
mA
mA
mV
V
mV/V
V
µA
µA
V
mA
0.2
6.7
7.0
7.3
V
1
1
2
2
2
2
3
3
1
1
1
3
3
4
5
V
CC
=5V, SW OFF
V
CC
=1.2V, SW OFF
V
CC
=5V, SW ON
V
CC
=1.2V, SW ON
V
CC
=1.2V
V
CC
=1.0~5.0V
V
CC
=1.2, R
M
=6Ω
V
CC
=1.0~5.0V, R
M
=6Ω
Voltage at which Icc reaches 90mA
RM=6Ω, IM=I
CC
-1mA
V
IN
(7PIN) =0.5V
V
IN
(7PIN) =3V
Voltage at which IM reaches 30mA
RM=1.2Ω, IM=VM/1.2
V
CC
=1.0V, R
M
=1.2Ω
V
CC
=1.0V, IM=200mA
V
CC
=1.0~5.0V
IM=25~200mA
K=
VM/
VA
500
0.5 mV/V
5
0.5
3.4
70
0.75
0.56 0.61 0.66
Bridge ratio
*
1
50
80
120
mΩ
V
CC
=1.0~5.0V
Output resistance
Ro
Vref
/ Ta
VM
/ Ta
K
/ Ta
VMT
5
IM=25~225mA
Ro=
Reference voltage temperature
characteristic
Output voltage
temperature characteristic
Bridge ratio temperature
characteristic
Output voltage aging drift
characteristic
2
3
VM/
IA
*
2
3
±100
±150
ppm/T
ppm/T
V
CC
=1.2V
Ta=-20~60°C
Ta=-20~60
°
C
*
*
V
CC
=1.2V, R
M
=6Ω
3
V
CC
=1.0~5.0V
5
IM=25~200mA
Ta=-20~60°C
±100
ppm/T
*
3
±0.1
%
3
V
CC
=1.2, R
M
=6Ω
T=15S~10M
Measurement conditions: Except where noted otherwise, in measurement circuits V
CC
=1.2V
1: At a certain point within the range V
CC
=1.0 to 5.0 V, IM=25 to 200 mA, the value of VA is varied and
the value VM/ VA is determined.
2: At a certain point within the range V
CC
=1.0 to 5.0 V, the value of IM is varied between 25 to 225 mA,
and the value VM/ IA is determined.
3: The temperature characteristics of the reference voltage, output voltage and bridge ratio, as well as
the drift characteristic, are all reference values and are not guaranteed.
*
*
*
MITSUMI
Electronic Governer for DC Motors LAG674
Block Diagram
Measuring Circuit
Measurement circuit 1
Measurement circuit 2
Measurement circuit 3
Measurement circuit 4
Measurement circuit 5
