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Part: MAX4081T
Category:
Analog & Mixed-Signal Processing
Description: MAX4080, MAX4081 76V, High-Side, Current-sense Amplifiers With Voltage Output
Company: Maxim Integrated Products
Datasheet: Download MAX4081T datasheet File size : 595 kB
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Datasheet text preview:
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 current monitoring is critical. The MAX4080 is designed for u n i d i r e c t i o n a l current-sense applications and the M A X 4 0 8 1 allows bidirectional current sensing. The MAX4081 single output pin continuously monitors the t r a n s i t i o n from charge to discharge and avoids the n e e d for a separate polarity output. The MAX4081 requires an external reference to set the zero-current output level (VSENSE = 0V). The charging current is represented 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) a n d common-mode input voltage (V RS+) . High-side current monitoring does not interfere with the ground p a t h 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 single 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.
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
MAX4080/MAX4081
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
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
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
RS+ 1 VCC 2 N.C. 3
8 7
RSN.C. N.C. OUT
RS+ 1 VCC 2 N.C. 3
8 7
RSREF1A REF1B OUT
MAX4080
6 5
MAX4081
6 5
GND 4
GND 4
µMAX/SO
µMAX/SO
________________________________________________________________ Maxim Integrated Products
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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 MAX4080/MAX4081
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 = 100k, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER Operating Voltage Range Common-Mode Range Supply Current Leakage Current Input Bias Current Full-Scale Sense Voltage (Note 4) SYMBOL VCC C MVR ICC IRS+, IRSIRS+, IRSV SENSE CONDITIONS Inferred from PSRR test Inferred from CMRR test (Note 3) VCC = VRS+ = 76V, no load VCC = VRS+ = 76V MAX4080F/MAX4081F MAX4080T/MAX4081T MAX4080S/MAX4081S MAX4080F/MAX4081F Gain AV MAX4080T/MAX4081T MAX4080S/MAX4081S Gain Accuracy AV VCC = VRS+ = 48V (Note 5) TA = +25°C TA = -40°C to +85°C TA = TMIN to TMAX Input Offset Voltage Common-Mode Rejection Ratio Power-Supply Rejection Ratio VOS CMRR PSRR VCC = VRS+ = 48V (Note 6) 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 MAX4080F/MAX4081F, VSENSE = 1000mV MAX4080T/MAX4081T, VSENSE = 250mV MAX4080S/MAX4081S, VSENSE = 100mV 0.15 0.27 V 100 100 124 122 ±0.1 MAX4080 MAX4081 MIN 4.5 4.5 75 103 0.01 5 ±1000 ±250 ±100 5 20 60 ±0.1 ±0.6 ±1 ±1.2 ±0.6 ±1 ±1.2 dB dB mV % V/V mV TYP MAX 76 76 190 190 2 12 UNITS V V µA µA µA
VCC = 0V, VRS+ = 76V
OUT High Voltage
(VCC VOH)
VCC = 4.5V, VRS+ = 48V, VREF1A = VREF1B = 2.5V, IOUT (sourcing) = +500µA (Note 8)
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76V, High-Side, Current-Sense Amplifiers with Voltage Output
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = VRS+ = 4.5V to 76V, VREF1A = VREF1B = 5V (MAX4081 only), VSENSE = (VRS+ - VRS-) = 0V, RLOAD = 100k, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS VCC = VRS+ = 48V, VREF1A = VREF1B = IOUT (sinking) = 10µA 2.5V, VSENSE = IOUT (sinking) = -1000mV (for 100µA MAX4081 only) Inferred from REF1A rejection ratio, V REF1A = V REF1B Inferred from REF1A rejection ratio, VREF1B = GND VCC = VRS+ = 48V, VSENSE = 0V, VREF1A = VREF1B = 1.5V to 6V VREF1A = 10V, VREF1B = GND, VCC = VRS+ = 48V (Note 2) VREF1B = GND 1.5 3 80 0.497 108 0.500 250 0.503 k MIN TYP 4 MAX 15 mV 23 55 6 12 V V dB UNITS
MAX4080/MAX4081
OUT Low Voltage
VOL
REF1A = REF1B Input Voltage Range (MAX4081 Only) REF1A Input Voltage Range (MAX4081 Only) REF1A Rejection Ratio (MAX4081 Only) REF/REF1A Ratio (MAX4081 Only) REF1A Input Impedance (MAX4081 Only)
(VREF GND) (VREF1A GND)
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