lmp8602mmx National Semiconductor Corporation, lmp8602mmx Datasheet

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lmp8602mmx

Manufacturer Part Number
lmp8602mmx
Description
60v Common Mode, Fixed Gain, Bidirectional Precision Current Sensing Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
© 2009 National Semiconductor Corporation
60V Common Mode, Fixed Gain, Bidirectional Precision
Current Sensing Amplifier
General Description
The LMP8602 and LMP8603 are fixed gain precision ampli-
fiers. The parts will amplify and filter small differential signals
in the presence of high common mode voltages. The input
common mode voltage range is –22V to +60V when operating
from a single 5V supply. With a 3.3V supply, the input com-
mon mode voltage range is from –4V to +27V. The LMP8602
and LMP8603 are members of the Linear Monolithic Precision
(LMP
rectional current sensing applications. All parameter values
of the parts that are shown in the tables are 100% tested and
all bold values are also 100% tested over temperature.
The parts have a precise gain of 50x for the LMP8602 and
100x for the LMP8603, which are adequate in most targeted
applications to drive an ADC to its full scale value. The fixed
gain is achieved in two separate stages, a preamplifier with a
gain of 10x and an output stage buffer amplifier with a gain of
5x for the LMP8602 and 10x for the LMP8603. The connection
between the two stages of the signal path is brought out on
two pins to enable the possibility to create an additional filter
network around the output buffer amplifier. These pins can
also be used for alternative configurations with different gain
as described in the applications section.
The mid-rail offset adjustment pin enables the user to use
these devices for bidirectional single supply voltage current
sensing. The output signal is bidirectional and mid-rail refer-
enced when this pin is connected to the positive supply rail.
With the offset pin connected to ground, the output signal is
unidirectional and ground-referenced.
The LMP8602 and LMP8603 are available in a 8–Pin SOIC
package and in a 8–Pin MSOP package.
Typical Applications
LMP™ is a trademark of National Semiconductor Corporation.
®
) family and are ideal parts for unidirectional and bidi-
300834
LMP8602/LMP8603
Features
Unless otherwise noted, typical values at T
V
Applications
S
= 5.0V, Gain = 50x (LMP8602), Gain = 100x (LMP8603)
TCV
CMRR
Input offset voltage
CMVR at V
CMVR at V
Operating ambient temperature range
Single supply bidirectional operation
All Min / Max limits 100% tested
High side and low side driver configuration current sensing
Bidirectional current measurement
Current loop to voltage conversion
Automotive fuel injection control
Transmission control
Power steering
Battery management systems
os
S
S
= 3.3V
= 5.0V
−40°C to 125°C
www.national.com
July 17, 2009
10μV/°C max
−22V to 60V
A
−4V to 27V
30083401
90 dB min
1 mV max
= 25°C,

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lmp8602mmx Summary of contents

Page 1

... With the offset pin connected to ground, the output signal is unidirectional and ground-referenced. The LMP8602 and LMP8603 are available in a 8–Pin SOIC package and in a 8–Pin MSOP package. Typical Applications LMP™ trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation LMP8602/LMP8603 Features Unless otherwise noted, typical values ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 4) Human Body For input pins only For all other pins Machine Model Charge Device Model ...

Page 3

Symbol Parameter Output Buffer (From A2 (pin 4) to OUT( pin Input Offset Voltage OS K2 Gain (Note 15) I Input Bias Current of A2 (Note 11 Output Voltage Swing (Notes 12, 13) ...

Page 4

Symbol Parameter TCR Output Impedance Filter Resistor Drift F-INT Ouput Voltage Swing OUT Output Buffer (From A2 (pin 4) to OUT( pin Input Offset Voltage OS K2 Gain (Note 15) I Input Bias Current ...

Page 5

Block Diagram Connection Diagram Pin Descriptions Pin Power Supply 2 6 Inputs 1 8 Filter Network 3 4 Offset 7 Output for LMP8602 for LMP8603 8-Pin SOIC / MSOP 30083402 Top View Name ...

Page 6

... Ordering Information Package Part Number LMP8602MA 8-Pin SOIC LMP8602MAX LMP8602MM 8–Pin MSOP LMP8602MMX LMP8603MA 8-Pin SOIC LMP8603MAX LMP8603MM 8–Pin MSOP LMP8603MMX www.national.com Package Marking Transport Media 95 Units/Rail LMP8602MA 2.5K Units Tape and Reel 95 Units/Rail LMP8602MM 3.5K Units Tape and Reel 95 Units/Rail LMP8603MA 2.5K Units Tape and Reel ...

Page 7

Typical Performance Characteristics ≤ ≤ 5V, GND = 0V, −22V V 60V, and vs 3. Input Bias Current Over Temperature (+IN and −IN pins ...

Page 8

Input Referred Voltage Noise vs. Frequency Gain vs. Frequency LMP8602 CMRR vs. Frequency at V www.national.com 30083410 Gain vs. Frequency LMP8603 30083411 = 3.3V CMRR vs. Frequency 30083428 8 PSRR vs. Frequency 30083417 30083412 = 5V S ...

Page 9

Step Response 3. 10kΩ LMP8602 L 30083418 Settling Time (Falling Edge 3.3V S LMP8602 30083420 Settling Time (Rising Edge 3.3V S LMP8602 30083422 Step Response ...

Page 10

Step Response 10kΩ LMP8603 L Settling Time (Falling Edge LMP8603 Settling Time (Rising Edge LMP8603 www.national.com = 3.3V S 30083443 = 3.3V Settling Time (Falling Edge 30083445 = 3.3V ...

Page 11

Positive Swing vs 3.3V LOAD S Negative Swing vs 3.3V LOAD S Gain Drift Distribution LMP8602 5000 parts 30083437 Positive Swing vs. R 30083413 Negative Swing vs. R 30083414 Gain Drift Distribution ...

Page 12

Gain error Distribution at V 5000 parts Gain error Distribution at V 5000 parts CMRR Distribution at V 5000 parts www.national.com = 3.3V LMP8602 Gain error Distribution 30083438 = 5V LMP8602 Gain error Distribution ...

Page 13

V Distribution 3. 5000 parts 30083434 TCV Distribution OS 5000 parts 30083436 V Distribution 5000 parts 30083435 www.national.com ...

Page 14

Application Information GENERAL The LMP8602 and LMP8603 are fixed gain differential volt- age precision amplifiers with a gain of 50x for the LMP8602, and 100x for the LMP8603. The input common mode voltage range is -22V to +60V when operating ...

Page 15

ADDITIONAL SECOND ORDER LOW PASS FILTER The LMP8602/LMP8603 has a third order Butterworth low- pass characteristic with a typical bandwidth of 60 kHz inte- grated in the preamplifier stage of the part. The bandwidth of the output buffer can be ...

Page 16

R can be calculated based on the desired value the 2 first step of the design procedure with the following equation: For the gain of 5 for the LMP8602 this results in: For the gain of 10 ...

Page 17

For the LMP8603: Given a desired value of the reduced gain G tion the required value for R can be calculated for the r LMP8602 with: and for the LMP8603 with: Increase Gain Figure 4 shows the configuration that can ...

Page 18

BIDIRECTIONAL CURRENT SENSING The signal on the A1 and OUT pins is ground-referenced when the OFFSET pin is connected to ground. This means that the output signal can only represent positive values of the current through the shunt resistor, so ...

Page 19

LMP8602/LMP8603 and the ADC as illustrat Figure 8. FIGURE 8. Reduce Error When Driving ADCs The external capacitor absorbs the charge that flows when the ADC sampling capacitor is connected. The external ca- pacitor should ...

Page 20

LOW SIDE CURRENT SENSING APPLICATION WITH NEGATIVE COMMON MODE TRANSIENTS Figure 10 illustrates the application of the LMP8602/ LMP8603 in a high side sensing application. This application is similar to the low side sensing discussed above, except in FIGURE 10. ...

Page 21

BATTERY CURRENT MONITOR APPLICATION This application example shows how the LMP8602/ LMP8603 can be used to monitor the current flowing in and out a battery pack. The fact that the LMP8602/LMP8603 can measure small voltages at a high offset voltage ...

Page 22

ADVANCED BATTERY CHARGER APPLICATION The above circuit can be used to realize an advanced battery charger that has the capability to monitor the exact net current that flows in and out the battery as show in Figure 12. The output ...

Page 23

Physical Dimensions inches (millimeters) unless otherwise noted 8Pin SOIC NS Package Number M08A 8Pin MSOP NS Package Number MUA08A 23 www.national.com ...

Page 24

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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