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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 Symbol Ratings Units
Operating temperature T
OPR
-
20~+60
°
C
Storage temperature T
STG
-
40~+125
°
C
Power supply current V
CC 7V
Power consumption I Pd1 600 mW
Power consumption II Pd2 900
*
1mW
Operating voltage Vop 5 V
Output current IL 1.0
*
2A
*
1: When mounted on a 20 30 0.5 mm printed circuit board (glass-reinforced epoxy).
*
2: When Pd exceeds the rated value, the value of Pd takes precedence.
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MITSUMI
Electronic Governer for DC Motors LAG674
Electrical Characteristics
(Except where noted otherwise, Ta=25°C)
Item Symbol
Measurement
Measurement conditions Min. Typ. Max. Units
circuit
Recommended operating
Vccopr 1.0 5.0 V
voltage range
Leakage current while off I Ileak1 1 VCC=5V, SW OFF 20 µA
Leakage current while off II Ileak2 1 V
CC=1.2V, SW OFF 5 µA
Power supply current while on
IICC12 VCC=5V, SW ON 1.2 1.8 mA
Power supply current while on
II I CC22 VCC=1.2V, SW ON 1.0 1.5 mA
Reference voltage Vref 2 V
CC=1.2V 115 127 140 mV
Reference voltage fluctuation
Vref 2 VCC=1.0~5.0V
-
0.5 0.5
mV/V
Output voltage VM 3 VCC=1.2, RM=6Ω 0.56 0.61 0.66 V
Reference voltage fluctuation
VM 3 VCC=1.0~5.0V, RM=6Ω
-
55
mV/V
Pin 7 threshold
Voltage at which Icc reaches 90mA
Motor ON/OFF SW
VTH 1
RM=6Ω, IM=ICC
-
1mA
0.3 0.43 0.5 V
Pin 7 input current I I IN1 1 V
IN (7PIN) =0.5V 0.8 1.6 3.4 µA
Pin 7 input current II I IN2 1 V
IN (7PIN) =3V 35 50 70 µA
Starting power supply voltage
Vccs 3
Voltage at which IM reaches 30mA
RM=1.2Ω, IM=VM/1.2
0.75 V
Startup current IMS 3 V
CC=1.0V, RM=1.2Ω 500 mA
Output saturation voltage Vosat 4 V
CC=1.0V, IM=200mA 0.2 V
V
CC=1.0~5.0V
Bridge ratio K 5 IM=25~200mA 6.7 7.0 7.3
K= VM/ VA
*
1
V
CC=1.0~5.0V
Output resistance Ro 5 IM=25~225mA 50 80 120 mΩ
Ro= VM/ IA
*
2
Reference voltage temperature
Vref
2
VCC=1.2V
±100
ppm/T
characteristic / Ta Ta=-20~60°C *3
Output voltage VM
3
V
CC=1.2V, RM=6Ω
±150
ppm/T
temperature characteristic / Ta Ta=-20~60°C *3
Bridge ratio temperature K
V
CC=1.0~5.0V
characteristic / Ta
5 IM=25~200mA ±100
ppm/T
Ta=-20~60°C *3
Output voltage aging drift
VMT 3
V
CC=1.2, RM=6Ω
characteristic T=15S~10M
±0.1 %
Measurement conditions: Except where noted otherwise, in measurement circuits VCC=1.2V
*
1: At a certain point within the range VCC=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 VCC=1.0 to 5.0 V, the value of IM is varied between 25 mA and 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.
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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
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