MAX4081SASA 반도체 회로 부품 판매점
76V / High-Side / Current-Sense Amplifiers with Voltage Output
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 Maxim Integrated |
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.
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
ABSOLUTE MAXIMUM RATINGS
VCC to GND ............................................................-0.3V to +80V
RS+, RS- to GND....................................................-0.3V to +80V
OUT to GND.............-0.3V to the lesser of +18V or (VCC + 0.3V)
REF1A, REF1B to GND
(MAX4081 Only)....-0.3V to the lesser of +18V or (VCC + 0.3V)
Output Short Circuit to GND.......................................Continuous
Differential Input Voltage (VRS+ - VRS-) ...............................±80V
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = VRS+ = 4.5V to 76V, VREF1A = VREF1B = 5V (MAX4081 only), VSENSE = (VRS+ - VRS-) = 0V, RLOAD = 100kΩ, TA = TMIN to
TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
Common-Mode Range
Supply Current
Leakage Current
Input Bias Current
Full-Scale Sense Voltage (Note 4)
Gain
Gain Accuracy
Input Offset Voltage
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
VCC
CMVR
ICC
IRS+, IRS-
IRS+, IRS-
VSENSE
AV
∆AV
VOS
CMRR
PSRR
Inferred from PSRR test
Inferred from CMRR test (Note 3)
VCC = VRS+ = 76V, MAX4080
no load
MAX4081
VCC = 0V, VRS+ = 76V
VCC = VRS+ = 76V
MAX4080F/MAX4081F
MAX4080T/MAX4081T
MAX4080S/MAX4081S
MAX4080F/MAX4081F
MAX4080T/MAX4081T
MAX4080S/MAX4081S
VCC = VRS+ = 48V
(Note 5)
VCC = VRS+ = 48V
(Note 6)
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
VCC = 48V, VRS+ = 4.5V to 76V
VRS+ = 48V, VCC = 4.5V to 76V
4.5 76
4.5 76
75 190
103 190
0.01 2
5 12
±1000
±250
±100
5
20
60
±0.1 ±0.6
±1
±1.2
±0.1 ±0.6
±1
±1.2
100 124
100 122
V
V
µA
µA
µA
mV
V/V
%
mV
dB
dB
OUT High Voltage
(VCC -
VOH)
VCC = 4.5V, VRS+
= 48V, VREF1A =
VREF1B = 2.5V,
IOUT (sourcing) =
+500µA (Note 8)
MAX4080F/MAX4081F,
VSENSE = 1000mV
MAX4080T/MAX4081T,
VSENSE = 250mV
MAX4080S/MAX4081S,
VSENSE = 100mV
0.15 0.27
V
2 _______________________________________________________________________________________
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76V / High-Side / Current-Sense Amplifiers with Voltage Output - Maxim Integrated
