MITSUMI
Sense Current Amplifier MM1380
Sense Current Amplifier
Monolithic IC MM1380
Outline
This IC improves on the previous sensor amp MM1089 (Dual). It is a single amp that allows current sensing
regardless of the IC power supply (V
CC
). Further, the common mode signal rejection ratio and power supply
fluctuation rejection ratio have been improved, and gain is switched between 50 and 100 times.
Features
(1) Common mode signal rejection ratio (CMRR1.1kHz)
(2) Power supply fluctuation rejection ratio (PSRR1.1kHz)
(3) Operating power supply voltage range
(4) Consumption current
(5) Voltage gain
(6) Input equivalent offset voltage
(7) Current detection
(8) Single type
100dB typ.
80dB typ.
+3 ~ +24V
150µA typ.
50/100 times switching
±0.5mV
High/Low switching
Package
VSOP-8A
Applications
(1) Notebook PCs
(2) PDA
Pin Assignment
1
8
7
6
5
2
3
1
2
3
4
4
5
6
VSOP-8A
7
8
ISEL
IN-
IN+
GND
COM
OUT
V
CC
GSEL
MITSUMI
Sense Current Amplifier MM1380
Pin Description
Pin No. Pin name
1
ISEL
Functions
Input selection switch terminal
Input common mode voltage range
ISEL ="H" : from 1.8V to 24V
ISEL ="L" : from -0.3V to V
CC
-2.4V
4
GND
Ground terminal
Internal equivalent circuit
2
3
IN-
IN+
Inverted input terminal
Non-Inverted input terminal
5
COM
Reference voltage input terminal
6
7
OUT
V
CC
Output terminal
Supply voltage terminal
8
GSEL
Gain selection switch terminal
Voltage gain
GSEL ="H" : Gv=100
GSEL ="L" : Gv=50
MITSUMI
Sense Current Amplifier MM1380
Block Diagram
Absolute Maximum Ratings
Item
Storage temperature
Supply voltage
Input terminal voltage
Allowable loss
Symbol
T
STG
V
CC
max.
V
I
max.
Pd
Ratings
-40~+125
-0.3~+25
-0.3~+25
300
Units
°C
V
V
mW
Recommended Operating Conditions
Item
Operating temperature
Operating voltage
Symbol
T
OPR
V
CC
Ratings
-20~+85
+3~+24
Units
°C
V
MITSUMI
Sense Current Amplifier MM1380
Electrical Characteristics
(Except where otherwise indicated, Ta=25°C, V
CC
=5V, Vicm=15V, Vcom=25V, Visel=5V, Vgsel=5V, R
L
=10kΩ)
Item
Supply voltage range
Supply current
Voltage gain 1 ( 100)
Voltage gain 2 ( 50)
Input offset voltage 1 (High side)
Input offset voltage 2 (Low side)
Temperature coefficient of Voff 1
Temperature coefficient of Voff 2
Input common mode
voltage range 1 (High side)
Input common mode
voltage range 2 (Low side)
Input differential voltage
Input bias current 1 (High side)
Input bias current 2 (Low side)
Input impedance
COM terminal voltage range
ISEL terminal current
ISEL terminal
voltage range 1 (High side)
ISEL terminal
voltage range 2 (Low side)
GSEL terminal sink current
GSEL terminal
voltage range 1 ( 100)
GSEL terminal
voltage range 2 ( 50)
Output voltage range
Output source current
Output sink current
Cut off frequency 1 (G
V
1=100)
Cut off frequency 2 (G
V
2=50)
Supply voltage
rejection ratio 1 (High side)
Supply voltage
rejection ratio 2 (Low side)
Common mode
rejection ratio 1 (High side)
Common mode
rejection ratio 2 (Low side)
Signal
V
CC
I
CC
G
V
1
G
V
2
V
OFF
1
V
OFF
2
V
OFF
1
V
OFF
2
Vicm1
Vicm2
Vidf
Ib1
Ib2
Zi
Vcom
Iisel
Visel1
Visel2
Igsel
Vgsel1
Vgsel2
V
OUT
Isrc
Isnk
F
C
1
F
C
2
PSRR1
PSRR2
CMRR1
CMRR2
R
L
: OPEN
V
OUT
=V
CC
-0.3V
V
OUT
=0.3V
Vgsel=5V, V
OUT
=-3dB
Vgsel=0V, V
OUT
=-3dB
f=1kHz, Visel=5V
f=1kHz, Visel=0V
f=1kHz, Visel=5V
f=1kHz, Visel=0V
70
70
70
70
Vgsel=5V
1.7
0
0.3
0.5
-0.5
1.0
-1.0
100
140
80
80
80
80
R
L
: OPEN
Visel=5V
1.7
0
1.0
24
0.5
V
CC
-0.3
Visel=5V,
Visel=0V,
V
IN
=0V
V
IN
=0V
Measurement conditions
Vcom=V
CC
/2
V
IN
=0V, R
L
: OPEN
Vgsel=5V
Vgsel=0V
V
IN
=0V, Visel=5V
V
IN
=0V, Visel=0V
Visel=5V
Visel=0V
Visel=5V
Visel=0V
97
48.5
-0.5
-0.5
-4
-6
1.8
-0.3
-200
0.8
-0.8
100
1.2
1.0
24
0.5
V
CC
-1.2
1.2
-1.2
Min. Typ. Max. Unit
3
150
100
50
24
200
103
0.5
0.5
4
6
24
V
CC
-2.4
200
1.6
-1.6
V
µA
mV/mV
mV
mV
µV/°C
µV/°C
V
V
mV
µA
µA
kΩ
V
µA
V
V
µA
V
V
V
mA
mA
kHz
kHz
dB
dB
dB
dB
51.5 mV/mV
MITSUMI
Sense Current Amplifier MM1380
Measuring Circuit
Supply voltage range
Supply current
Voltage gain
Offset voltage
Input common mode voltage range
Input bias current
COM terminal voltage range
Output voltage range
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