ROHM BU7271G

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STRUCTURE
SILICON MONOLITHIC INTEGRATED CIRCUIT
FUNCTION
INPUT/OUTPUT FULL SWING SINGLE CMOS OPERATIONAL AMPLIFIER
PRODUCT SERIES
BU7271G
BU7271SG
・Wide operating temperature range (BU7271SG:-40[℃]~105[℃])
・Low input bias current(1[pA] typ.)
・Slew Rate(0.05[V/μs] typ.)
・Low supply current(8.6[μA] typ.)
・Wide input and output voltage range(VSS~VDD)
・Low power supply voltage operation(1.8[V]~5.5[V])
FEATURES
○ABSOLUTE MAXIMUM RATINGS(Ta=25[℃])
Parameter
Symbol
Supply Voltage
Power dissipation
Rating
Unit
VDD-VSS
+7
V
Pd
540(*1)(*2)
mW
Differential Input Voltage(*3)
Vid
VDD-VSS
V
Input Common-mode Voltage Range
Vicm
(VSS-0.3)~VDD+0.3
V
Operating Temperature range
Topr
BU7271
-40~+85
BU7271S
-40~+105
℃
Storage Temperature Range
Tstg
-55~+125
℃
Maximum junction Temperature
Tjmax
+125
℃
・This IC is not designed for protection against radioactive rays.
(*1) To use at temperature above Ta=25[℃] reduce 5.4[mW].
(*2) Mounted on a glass epoxy PCB(70[mm]×70[mm]×1.6[mm]).
(*3) The voltage difference between inverting input and non-inverting input is the differential input voltage.
Then input terminal voltage is set to more than VSS.
○OPERATING CONDITION(BU7271G:Ta=-40[℃]~+85[℃] BU7271SG:Ta=-40[℃]~+105[℃])
Parameter
Supply Voltage
Symbol
Rating
Unit
VDD
+1.8~+5.5 (Single Supply)
V
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○ELECTRICAL CHARACTERISTICS (unless otherwise specified VDD=+3[V]、VSS=0[V])
Parameter
Symbol
Guaranteed Limit
Temperature
Unit
Input offset voltage(*4)
Vio
25℃
Min.
-
Input offset current(*4)
Iio
25℃
-
1
-
pA
Input bias current(*4)
Ib
25℃
-
1
-
pA
range
Supply current(*6)
IDD
Typ.
1
Max.
8
mV
25℃
-
8.6
17
Full range
-
-
25
μA
Condition
RL=∞ All Op-Amps
AV=0[dB],VIN=1.5[V]
High level output voltage
VOH
25℃
VDD-0.1
-
-
V
RL=10[kΩ]
Low level output voltage
VOL
25℃
-
-
VSS+0.1
V
RL=10[kΩ]
Large signal voltage gain
AV
25℃
70
100
-
dB
RL=10[kΩ]
Input common mode voltage
Vicm
25℃
0
-
3.0
V
VSS~VDD
Common mode rejection ratio
CMRR
25℃
45
60
-
dB
Power supply rejection ratio
PSRR
25℃
60
80
-
dB
Output source current(*5)
IOH
25℃
2
4
-
mA
VDD-0.4[V]
Output sink current(*5)
IOL
25℃
4
8
-
mA
VSS+0.4[V]
Slew rate
SR
25℃
-
0.05
-
V/μs
CL=25[pF]
Gain band width
FT
25℃
-
90
-
kHz
Phase margin
θ
25℃
-
60°
-
CL=25[pF], AV=40[dB]
CL=25[pF], AV=40[dB]
(*4) Absolute value
(*5) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*6) Full range BU7271:-40[℃]~+85[℃] BU7271S:-40[℃]~+105[℃]
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○Physical Dimensions
BU7271G(SSOP5) (Unit:[mm])
BU7271SG(SSOP5) (Unit:[mm])
○Block diagram
○Pin No.・Pin Name
IN+
1
VSS
2
IN-
3
5
VDD
4
OUT
Pin No.
1
2
3
4
5
+
-
Pin Name
IN+
VSS
INOUT
VDD
G:SSOP5
○Application example
(1) Absolute maximum ratings
Absolute maximum ratings are the values which indicate the limits,
within which the given voltage range can be safely charged to the terminal.
However, it does not guarantee the circuit operation.
(2) Applied voltage to the input terminal
For normal circuit operation of operational amplifier, please input voltage for its
input terminal within input common mode voltage VDD+0.3[V].
Then, regardless of power supply voltage,VSS-0.3[V] can be applied to input
terminals without deterioration or destruction of its characteristics.
(3) Operating power supply (split power supply/single power supply)
The operational amplifier operates if a given level of voltage is applied between VDD and
VSS. Therefore, the operational amplifier can be operated under single power supply
or split power supply.
(4) Power dissipation (pd)
If the IC is used under excessive power dissipation. An increase in the chip temperature will cause
deterioration of the radical characteristics of IC.
For example, reduction of current capability. Take consideration of the effective power dissipation and
thermal design with a sufficient margin. Pd is reference to the provided power dissipation curve.
(5) Short circuits between pins and incorrect mounting
Short circuits between pins and incorrect mounting when mounting the IC on a printed circuits board,
take notice of the direction and positioning of the IC.
If IC is mounted erroneously, It may be damaged. Also, when a foreign object is inserted between
output, between output and VDD terminal or VSS terminal which causes short circuit, the IC may be damaged.
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(6) Output short circuit
If short circuit occurs between the output terminal and VDD terminal, excessive
in output current may flow and generate heat, causing destruction of the IC. Take due care.
(7) Using under strong electromagnetic field
Be careful when using the IC under strong electromagnetic field because it may malfunction.
(8) Usage of IC
When stress is applied to the IC through warp of the printed circuit board,
The characteristics may fluctuate due to the piezo effect.
Be careful of the warp of the printed circuit board.
(9) Testing IC on the set board
When testing IC on the set board, in cases where the capacitor is connected to the low impedance,
make sure to discharge per fabrication because there is a possibility that IC may be damaged by stress.
When removing IC from the set board, it is essential to cut supply voltage.
As a countermeasure against the static electricity, observe proper grounding during fabrication process
and take due care when carrying and storage it.
(10) The IC destruction caused by capacitive load
The transistors in circuits may be damaged when VDD terminal and VSS terminal is shorted with the charged
output terminal capacitor.
When IC is used as a operational amplifier or as an application circuit, where oscillation is not activated
by an output capacitor,the output capacitor must be kept below 0.1[μF] in order to prevent the damage
mentioned above.
(11) Decupling capacitor
Insert the decupling capacitance between VDD and VSS, for stable operation of operational amplifier.
(12) Latch up
Be careful of input voltage that exceed the VDD and VSS. When CMOS device have sometimes occur
latch up operation. And protect the IC from abnormaly noise
(13) Crossorver distortion
Inverting amplifier is generete crossover distortion when feed back resistance value is small.
To supress the crosover distortion, connect a resistor between the output terminal and VSS
Then increse the bias current to enable class A output stage operation.
Feed back resistance
VDD
+
Pull down resistance
VSS
Fig1.Pull down resistance
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Notice
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