TGS LM321MF

TIGER ELECTRONIC CO.,LTD
Low Power Single Op Amp
LM321MF
DESCRIPTION
The LM321 brings performance and economy to low power
systems. With a high unity gain frequency and a
guaranteed 0.4V/µs slew rate, the quiescent current is
only 430µA/amplifier (5V). The input common mode
range includes ground and therefore the device is able to
operate in single supply applications as well as in dual
SOT-23-5L
supply applications. It is also capable of comfortably
driving large capacitive loads.
The LM321MF is available in the SOT-23-5L package. Overall the LM321MF is a low power, wide
supply range performance op amp that can be designed into a wide range of applications
at an economical price without sacrificing valuable board space.
FEATURES
Gain-Bandwidth product: 1MHz
Low supply current: 430µA
Low input bias current: 45nA
Wide supply voltage range: +3V to +32V
Single version of LM358
APPLICATIONS
Chargers
Power supplies
Industrial: controls, instruments
Desktops
Communications infrastructure
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LM321MF
BLOCK DIAGRAM
MARKING INFORMATION
Print Model
Data Code
D321: E
Year Code
ABSOLUTE MAXIMUM RATINGS (Note 1)
Characteristic
+
Value
Unit
32
V
-0.3~+32
V
-
Supply Voltage,(V - V )
Input Vo ltage
Output Short Circuit to GND V + ≤ 15V anf Ta=25 ℃
Note2
Continuous
Junction Temp erature (Note3)
150
℃
Thermal Resistance to Ambient (θ J A )
265
℃
-40~+85
℃
-65~+150
℃
Operating Temp erature Range
Storage Temp erature Range
ELECTRICAL CHARACTERISTICS
Parameter
(Unless otherwise specified: V + =5.0V)
Test Conditions
Input Offset Vo ltage
Ta=2 5℃ ( Note 4)
Input Bias Current
Ta=2 5℃ , I I N ( + ) or I I N ( - ) ,
V C M =0V ( Note 5)
Input Offset Current
Ta=2 5℃ , I I N ( + ) - I I N ( - ), V C M =0V
Input
Common-Mode
Ta=2 5℃ , V + =30V( Note 6)
Voltage Range
Over
Full
Temperature V + =30V
Supply Current
Range, R L =∞ on all Op
V + =5V
Amps
+
Large Signal Vo ltage V =15V, Ta=2 5℃ , R L ≥2 k Ω
Gain
( For Vo=1~11V)
Co mmon-M ode
DC, Ta=2 5℃ , V C M =0~V + -1.5V
Rejection Ratio
Power Supply
DC, Ta=2 5℃ , V + =5~30V
Rejection Ratio
Amplifier-to-Amplifier Ta=2 5℃ , f=1~20kHz
Coupling
( Input Referred)( Note 7)
Min.
Typ .
Max.
Unit
2
5
mV
45
150
nA
3
30
nA
V + -1.5
V
0
0.66
2
0.43
1.2
mA
50
100
V/mV
70
90
dB
75
100
dB
-120
dB
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LM321MF
Source
Output
Current
Sink
V I N ( + ) =1V,V I N ( - ) =0V,V + =15V,Vo=2V,
Ta=2 5℃
V I N ( - ) =1V,V I N ( + ) =0V,V + =15V,Vo=2V,
Ta=2 5℃
V I N ( - ) =1V,V I N ( + ) =0V,V + =15V,
Vo=200mV,Ta=25℃
20
40
mA
10
20
mA
12
50
µA
Short Circuit to Ground V + =15V, Ta=2 5℃ ( Note 2 )
Output
Vo ltage
Swing
VOH
VOL
V + =30V
40
R L =2kΩ
26
R L =10kΩ
27
+
V =5V, R L =10kΩ
85
mA
V
28
5
V
20
mV
N o t e 1 Absolute Maximu m Ratings indicate limits beyond which damage to the device may
occur. Operating Ratings indicate conditions for which the device is intended to be
functional, but specific performance is not guaranteed. For guaranteed specifications and
the test conditions, see the Electrical Characteristics.
N o t e 2 : Short circuits from the output to V
+
can cause excessive heating and eventual
destruction. When considering short circuits to ground, the maximum output current is
approximately 40mA independent of the magnitude of V + . At values of supply voltage in
excess of +15V, continuous short-circuits can exceed the power dissipation ratings and
cause eventual destruction. Destructive dissipation can result from simultaneous shorts on
all amplifiers.
N o t e 3 : The maximum power dissipation is a function of T J ( M A X ) , θ J A , and Ta. The
maximum allowable power dissipation at any ambient temperature is P D = (T J ( M A X ) - Ta)/
θ J A . All numbers apply for packages soldered directly onto a PC board.
Note 4: Vo=1.4V, Rs = 0Ω with V + from 5V to 30V; and over the full input common-mode
range (0V to V + -1.5V) at 25°C
Note 5: The direction of the input current is out of the IC due to the PNP input stage. This
current is essentially constant, independent of the state of the output so no loading change
exists on the input lines.
Note 6: The input common-mode voltage of either input signal voltage should not be
allowed to go negative by more than 0.3V (at 25°C). The upper end of them common-mode
voltage range is V + -1.5V (at 25°C), but either or both inputs can go to +32V without
damage, independent of the magnitude of V + .
Note 7: Due to proximity of external components, insure that coupling is not originating via
stray capacitance between these external parts. This typically can be detected as this type of
capacitance increases at higher frequencies.
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LM321MF
SIMPLIFIED SCHEMATIC
APPLICATION CIRCUIT
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LM321MF
TYPICAL APPLICATIONS
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LM321MF
APPLICATION SUMMARY
The LM321MF op amp can operate with a single or dual power supply voltage, has
true-differential inputs, and remain in the linear mode with an input common-mode voltage
of 0 V D C . This amplifier operates over a wide range of power supply voltages, with little
change in performance characteristics. At 25°C amplifier operation is possible down to a
minimum supply voltage of 3V.
Large differential input voltages can be easily accommodated and, as input differential
voltage protection diodes are not needed, no large input currents result from large
differential input voltages. The differential input voltage may be larger than V + without
damaging the device. Protection should be provided to prevent the input voltages from
going negative mo re than − 0.3 V D C (at 25°C). An input clamp diode with a resistor to the
IC input terminal can be used.
To reduce the power supply drain, the amplifier has a class A output stage for small signal
levels which converts to class B in a large signal mode. This allows the amplifiers to both
source and sink large output currents. Therefore both NPN and PNP external current boost
transistors can be used to extend the power capability of the basic amplifiers. The output
voltage needs to raise approximately 1 diode drop above ground to bias the on-chip vertical
PNP transistor for output current sinking applications.
For AC applications, where the load is capacitively coupled to the output of the amplifier, a
resistor should be used, from the output of the amplifier to ground to increase the class A
bias current and to reduce distortion.
Capacitive loads which are applied directly to the output of the amplifier reduce the loop
stability margin. Values of 50pF can be accommodated using the worst-case non-inverting
unity gain connection. Large closed loop gains or resistive isolation should be used if large
load capacitance must be driven by the amplifier.
The bias network of the LM321MF establishes a supply current which is independent of the
magnitude of the power supply voltage over the range of from 3 V D C to 30 V D C .
Output short circuits either to ground or to the positive power suppl y should be of short
time duration. Units can be destroyed, not as a result of the short circuit current causing
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LM321MF
metal fusing, but rather due to the large increase in IC chip dissipation which will cause
eventual failure due to excessive junction temp eratures. The larger value of output source
current which is available at 25°C provides a larger output current capability at elevated
temperatures than a standard IC op amp.
The circuits presented in the section on typical applications emphasize operation on only a
single power supply voltage. If complementary power supplies are available, all of the
standard op amp circuits can be used. In general, introducing a pseudo-ground (a bias
voltage reference of V + /2) will allow operation above and below this value in single power
supply systems. Many application circuits are shown which take advantage of the wide input
common-mode voltage range which includes ground. In most cases, input biasing is not
required and input voltages which range to ground can easily be accommodated.
CHARACTURISTIC CURVES
(Unless otherwise specified: Vs=+5V, single supply,Ta=25 ℃ )
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LM321MF
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LM321MF
OUTLINE DRAWING
SOT-2 3-5 L
Unit:mm
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