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LM432 Dual Op Amp with On-Chip Fixed 2.5V Reference
August 2000
LM432 Dual Op Amp with On-Chip Fixed 2.5V Reference
General Description
The LM432 integrates two operational amplifiers and one 2.5V reference. The reference is based on the LMV431 adjustable shunt regulator with the output voltage adjusted to a fixed 2.5V. The Op Amps are similar to the LM358 with a common-mode input range that includes ground. Integrating the reference and Op Amps creates a solution for low cost charging applications.
Features
Dual Op Amp Circuitry (Typical for VS = 5V) n Input offset voltage 0.6mV n Input offset current 1nA n Input bias current 3nA n Common-mode input voltage range 0V to VS-1V n Power supply current 150A Reference Circuitry n Reference voltage 2.5V n Reference voltage deviation (-40C to 85C) 4mV n Sink Current Capability 0.2mA to 10mA
Applications
n Low cost charging circuitry n Power supplies and adapters
Connection Diagram
8-Pin SOIC
Application Circuit
DS101390-2
Optocoupler Driver Circuit for Power Supply Isolation
DS101390-1
Top View
Ordering Information
Symbol 8-Pin SOIC Part Number LM432MA LM432MAX Package Markiing LM432MA LM432MA Transport Media Rails 2.5k Unit Tape and Reel NSC Drawing M08A
(c) 2000 National Semiconductor Corporation
DS101390
www.national.com
LM432
Absolute Maximum Ratings (Notes 1, 3)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Suppy Voltage (VS) Storage Temperature Junction Temperature (TJ) ESD Human Body Model 20V -65C to 150C 150C 2kV
Input Voltage Range
-0.3V to 20V
Operating Ratings(Note 2),(Note 3)
Temperature Range Supply Voltage (Note 8) Thermal Resistance(JA) -40C to 85C 2.5V to 16V 162C/W
The following specifications apply for both amplifiers at VS = 5V, VCM = 2.5V, VO = 2.5V, RL = , and TJ = 25C, unless otherwise noted. Symbol OP Amp Circuitry VOS IOS IB VCM IS AV Input Offset Voltage Input Offset Current Input Bias Current Common-Mode Input Voltage Range Power Supply Current Voltage Gain Amplifier B only Amplifier B only Amplifier B only Amplifier B only, CMRR > 50dB Total for both amplifiers VS = 16V, 1V < VO < 11V, RL = 10k connected to VS/2 65 0 150 100 -4 0.6 1 3 4 50 150 VS-1 500 mV nA nA V A dB Parameter Conditions Min (Note 5) Typ (Note 4) Max (Note 5) Units
Electrical Characteristics
VOL VOH ISOURCE ISINK VZ VZDEV
Output Voltage Low Output Voltage High Output Current Source Output Current Sink Reference Voltage at IN+ Terminal Reference Voltage Deviation at IN Terminal Over Temperature (Note 6),(Note 9) Minimum Cathode Current for Regulation at IN+ (VZ) Terminal Dynamic Output Impedance (Note 7) 200A < IZ < 1mA, Freq = 0Hz
+
2 VS - 1.5 20 5 2.450 -40C TJ 85C VS - 1.3 30 11 2.5 4
50
mV V mA mA
Reference Circuitry For Op Amp A The following specifications apply for IZ = 200A and TJ = 25C, unless otherwise noted. 2.550 65 V mV
IZ (MIN) rz
150 0.2
200
A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: Operating Rating indicate conditions for which the device is functional. These rating do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 3: All voltages are measured with respect to GND = 0VDC, unless otherwise specified. Note 4: Typicals represent the most likely parametic norm. Note 5: Guaranteed to National's Average Outgoing Quality Level (AOQL). Note 6: Reference voltage deviation, VZDEV, is defined as the maximum variation of the reference input voltage over the full temperature range. Note 7: The Dynamic Output Impendance, rz, is defined as rz = VZ/IZ . Note 8: Minimum value of operating voltage is for Amplifier B only. Note 9: Typical Temperature drift V/T = 12.8ppm/C
www.national.com
2
LM432 Dual Op Amp with On-Chip Fixed 2.5V Reference
Physical Dimensions
inches (millimeters) unless otherwise noted
8-Pin SOIC NS Package Number M08A
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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