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PDF MAX4081TASA Data sheet ( Hoja de datos )
| Número de pieza | MAX4081TASA | |
| Descripción | 76V / High-Side / Current-Sense Amplifiers with Voltage Output | |
| Fabricantes | Maxim Integrated | |
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19-2562; Rev 0; 10/02
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
General Description
The MAX4080/MAX4081 are high-side, current-sense
amplifiers with an input voltage range that extends from
4.5V to 76V making them ideal for telecom, automotive,
backplane, and other systems where high-voltage cur-
rent monitoring is critical. The MAX4080 is designed for
unidirectional current-sense applications and the
MAX4081 allows bidirectional current sensing. The
MAX4081 single output pin continuously monitors the
transition from charge to discharge and avoids the
need for a separate polarity output. The MAX4081
requires an external reference to set the zero-current
output level (VSENSE = 0V). The charging current is rep-
resented by an output voltage from VREF to VCC, while
discharge current is given from VREF to GND.
For maximum versatility, the 76V input voltage range
applies independently to both supply voltage (VCC)
and common-mode input voltage (VRS+). High-side
current monitoring does not interfere with the ground
path of the load being measured, making the
MAX4080/MAX4081 particularly useful in a wide range
of high-voltage systems.
The combination of three gain versions (5V/V, 20V/V,
60V/V = F, T, S suffix) and a user-selectable, external
sense resistor sets the full-scale current reading and its
proportional output voltage. The MAX4080/MAX4081
offer a high level of integration, resulting in a simple,
accurate, and compact current-sense solution.
The MAX4080/MAX4081 operate from a 4.5V to 76V sin-
gle supply and draw only 75µA of supply current. These
devices are specified over the automotive operating
temperature range (-40°C to +125°C) and are available
in a space-saving 8-pin µMAX or SO package.
Applications
Automotive (12V, 24V, or 42V Batteries)
48V Telecom and Backplane Current
Measurement
Bidirectional Motor Control
Power-Management Systems
Avalanche Photodiode and PIN-Diode Current
Monitoring
General System/Board-Level Current Sensing
Precision High-Voltage Current Sources
Features
o Wide 4.5V to 76V Input Common-Mode Range
o Bidirectional or Unidirectional ISENSE
o Low-Cost, Compact, Current-Sense Solution
o Three Gain Versions Available
5V/V (MAX4080F/MAX4081F)
20V/V (MAX4080T/MAX4081T)
60V/V (MAX4080S/MAX4081S)
o ±0.1% Full-Scale Accuracy
o Low 100µV Input Offset Voltage
o Independent Operating Supply Voltage
o 75µA Supply Current (MAX4080)
o Reference Input for Bidirectional OUT (MAX4081)
o Available in a Space-Saving 8-Pin µMAX Package
Ordering Information
PART
MAX4080FAUA
MAX4080FASA
MAX4080TAUA
MAX4080TASA
MAX4080SAUA
MAX4080SASA
MAX4081FAUA
MAX4081FASA
MAX4081TAUA
MAX4081TASA
MAX4081SAUA
MAX4081SASA
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
RS+ 1
VCC 2
N.C. 3
GND 4
MAX4080
8 RS- RS+ 1
7 N.C. VCC 2
6 N.C. N.C. 3
5 OUT GND 4
MAX4081
8 RS-
7 REF1A
6 REF1B
5 OUT
µMAX/SO
µMAX/SO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Typical Operating Characteristics
(VCC = VRS+ = 48V, VSENSE = 0V, CLOAD = 20pF, RLOAD = ∞, TA = +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE HISTOGRAM
35
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
300
GAIN ACCURACY vs. TEMPERATURE
0.5
30
25
20
15
10
5
0
-125 -100 -75 -50 -25 0 25 50 75 100 125
INPUT OFFSET VOLTAGE (µV)
250
200
150
100
50
0
-50
-100
-150
-200
-250
-300
-50 -25
0 25 50 75 100 125 150
TEMPERATURE (°C)
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
-50
-25
0 25 50 75 100 125
TEMPERATURE (°C)
GAIN ACCURACY vs. VCC
0
VRS+ = 48V
S VERSION
-0.05
-0.10 T VERSION
-0.15
F VERSION
-0.20
4
16 28 40 52 64 76
VCC (V)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
1
MAX4081F/T/S
REFERENCE REJECTION RATIO
vs. FREQUENCY
10 100 1k 10k
FREQUENCY (Hz)
100k
MAX4081F/T/S
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
MAX4080F/T/S
SMALL-SIGNAL GAIN vs. FREQUENCY
50
45 VSENSE = 10mV
40
MAX4080S
35
30
MAX4080T
25
20
15 MAX4080F
10
5
0
0.1
1 10 100
FREQUENCY (kHz)
1000
MAX4081F/T/S
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
MAX4081F/T/S
SMALL-SIGNAL GAIN vs. FREQUENCY
50
45 VOUT = 100mVP-P
40
MAX4081S
35
30
MAX4081T
25
20
15 MAX4081F
10
5
0
0.1
1 10 100
FREQUENCY (kHz)
1000
_______________________________________________________________________________________ 5
5 Page 
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Table 1. Typical Component Values
FULL-SCALE LOAD
CURRENT, ILOAD (A)
0.500
0.125
0.050
5.000
1.250
0.500
50.000
12.500
5.000
CURRENT-SENSE
RESISTOR (mΩ)
1000
1000
1000
100
100
100
10
10
10
GAIN
(V/V)
5
20
60
5
20
60
5
20
60
FULL-SCALE
VSENSE
(mV)
±500
±125
±50
±500
±125
±50
±500
±125
±50
MAX4081 FULL-SCALE
OUTPUT VOLTAGE
(VOUT - VREF, V)
±2.5
±2.5
±3.0
±2.5
±2.5
±3.0
±2.5
±2.5
±3.0
FULL-SCALE LOAD
CURRENT, ILOAD (A)
1.000
0.250
0.100
10.000
2.500
1.000
50.000
25.000
10.000
CURRENT-SENSE
RESISTOR (mΩ)
1000
1000
1000
100
100
100
10
10
10
GAIN
(V/V)
5
20
60
5
20
60
5
20
60
FULL-SCALE
VSENSE
(mV)
1000
250
100
1000
250
100
500
250
100
MAX4080 FULL-SCALE
OUTPUT VOLTAGE (V)
5.0
5.0
6.0
5.0
5.0
6.0
2.5
5.0
6.0
External References (MAX4081)
For the bidirectional MAX4081, the VOUT reference level
is controlled by REF1A and REF1B. VREF is defined as
the average voltage of VREF1A and VREF1B. Connect
REF1A and REF1B to a low-noise, regulated voltage
source to set the output reference level. In this mode,
VOUT equals VREF1A when VSENSE equals zero (see
Figure 4).
Alternatively, connect REF1B to ground, and REF1A to a
low-noise, regulated voltage source. In this case, the out-
put reference level (VREF) is equal to VREF1A divided by
two. VOUT equals VREF1A/2 when VSENSE equals zero.
In either mode, the output swings above the reference
voltage for positive current-sensing (VRS+ > VRS-). The
output swings below the reference voltage for negative
current-sensing (VRS+ < VRS-).
Applications Information
Recommended Component Values
Ideally, the maximum load current develops the full-
scale sense voltage across the current-sense resistor.
Choose the gain needed to yield the maximum output
voltage required for the application:
VOUT = VSENSE ✕ AV
where VSENSE is the full-scale sense voltage, 1000mV
for gain of 5V/V, 250mV for gain of 20V/V, 100mV for
gain of 60V/V, and AV is the gain of the device.
In applications monitoring a high current, ensure that
RSENSE is able to dissipate its own I2R loss. If the resis-
tor’s power dissipation is exceeded, its value may drift
or it may fail altogether.
The MAX4080/MAX4081 sense a wide variety of cur-
rents with different sense-resistor values. Table 1 lists
common resistor values for typical operation.
______________________________________________________________________________________ 11
11 Page | ||
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