Document
LM321 Low Power Single Op Amp
April 2001
LM321 Low Power Single Op Amp
General 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 supply applications. It is also capable of comfortably driving large capacitive loads. The LM321 is available in the SOT23-5 package. Overall the LM321 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
(VCC = 5V, TA = 25˚C. Typical values unless specified). n Gain-Bandwidth product 1MHz n Low supply current 430µA n Low input bias current 45nA n Wide supply voltage range +3V to +32V n Stable with high capacitive loads n Single version of LM324
Applications
n n n n n Chargers Power supplies Industrial: controls, instruments Desktops Communications infrastructure
Connection Diagram
SOT23-5
Application Circuit
DC Summing Amplifier (VIN’s ≥ 0 VDC and VO ≥ VDC)
20007601
Top View
20007607
Where: V0 = V1 + V2 - V3 - V4, (V1+ V2) ≥ (V3 + V4) to keep VO
> 0 VDC
Ordering Information
Package 5-Pin SOT-23 Part Number LM321MF LM321MFX Package Marking A63A Transport Media 1k Units Tape and Reel 3k Units Tape and Reel NSC Drawing MF05A
© 2001 National Semiconductor Corporation
DS200076
www.national.com
LM321
Absolute Maximum Ratings
(Note 1)
Junction Temperature (Note 3) Mounting Temperature Lead Temp (Soldering, 10 sec) Infrared (10 sec) Thermal Resistance to Ambient (θJA) ESD Tolerance (Note 10)
150˚C 260˚C 215˚C 265˚C/W 300V
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Differential Input Voltage Input Current (VIN < −0.3V) (Note 6) Supply Voltage (V+ - V−) Input Voltage Output Short Circuit to GND, V+ ≤ 15V and TA = 25˚C (Note 2) Storage Temperature Range
± Supply Voltage
50mA 32V −0.3V to +32V Continuous −65˚C to 150˚C
Operating Ratings (Note 1)
Temperature Range Supply Voltage −40˚C to 85˚C 3V to 30V
Electrical Characteristics
Symbol VOS IOS IB VCM AV PSRR CMRR VO Parameter Input Offset Voltage Input Offset Current Input Bias Current (Note 8)
Unless otherwise specified, all limits guaranteed for at TA = 25˚C; V+ = 5V, V− = 0V, VO = 1.4V. Boldface limits apply at temperature extremes. Conditions (Note 7) Min (Note 5) Typ (Note 4) 2 5 45 V+ = 30V (Note 9) For CMRR > = 50dB (V+ = 15V, RL = 2kΩ VO = 1.4V to 11.4V) RS ≤ 10kΩ, V+ ≤ 5V to 30V RS ≤ 10kΩ VOH VOL V+ = 30V, RL = 2kΩ V+ = 30V, RL = 10kΩ V+ = 5V, RL = 10kΩ V = 5V V+ = 30V
+
Max (Note 5) 7 9 50 150 250 500 V+ - 1.5 V+ -2
Units mV nA nA V V/mV dB dB V
Input Common-Mode Voltage Range Large Signal Voltage Gain Power Supply Rejection Ratio Common Mode Rejection Ratio Output Swing
0 25 15 65 65 26 27 28 5 0.430 0.7 0.660 1.5 20 10 10 5 12 40 20 20 8 100 40 100 100 85
20 1.15 1.2 2.85 3
mV mA
IS
Supply Current, No Load
ISOURCE ISINK
Output Current Sourcing Output Current Sinking
VID = +1V, V+ = 15V, VO = 2V VID = −1V V+ = 15V, VO = 2V VID = −1V V+ = 15V, VO = 0.2V
mA
mA µA 85 mA
IO SR
Output Short Circuit to Ground (Note 2) Slew Rate
V+ = 15V V+ = 15V, RL = 2kΩ, VIN = 0.5 to 3V CL = 100pF, Unity Gain V+ = 30V, f = 100kHz, VIN = 10mV, RL = 2kΩ, CL = 100pF
0.4
V/µs
GBW
Gain Bandwidth Product
1 60
MHz deg
φm
Phase Margin
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2
LM321
Electrical Characteristics
Symbol THD Parameter Total Harmonic Distortion
Unless otherwise specified, all limits guaranteed for at TA = 25˚C; V+ = 5V, V− = 0V, VO = 1.4V. Boldface limits apply at temperature extremes. (Continued) Conditions f = 1kHz, AV = 20dB RL = 2kΩ, VO = 2VPP, CL = 100pF, V+ = 30V f = 1kHz, RS = 100Ω V+ = 30V Min (Note 5) Typ (Note 4) 0.015 40 nV/ Max (Note 5) Units
%
en
Equivalent Input Noise Voltage
Note 1: Absolute Maximum 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. Note 2: Short circuits from the output 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. Note 3: The maximum power dissipation is a function of TJ(MAX), θJA , and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/ θJA . All numbers apply for packages soldered directly onto a PC boar.