EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output General Description Benefits and Features The MAX4080/MAX4081 are high-side, current-sense Ideal for High-Voltage Current Monitoring Applications amplifiers with an input voltage range that extends from Wide 4.5V to 76V Input Common-Mode Range 4.5V to 76V making them ideal for telecom, automotive, Independent Operating Supply Voltage backplane, and other systems where high-voltage current High Accuracy and Low Quiescent Current Support monitoring is critical. The MAX4080 is designed for uni- Precision Application Requirements directional current-sense applications and the MAX4081 0.1% Full-Scale Accuracy allows bidirectional current sensing. The MAX4081 sin- Low 100V Input Offset Voltage gle output pin continuously monitors the transition from Three Gain Versions Available charge to discharge and avoids the need for a separate - 5V/V (MAX4080F/MAX4081F) polarity output. The MAX4081 requires an external refer- - 20V/V (MAX4080T/MAX4081T) ence to set the zero-current output level (V = 0V). SENSE - 60V/V (MAX4080S/MAX4081S) The charging current is represented by an output voltage 75A Supply Current (MAX4080) from V to V , while discharge current is given from REF CC Flexible Current Sensing Supports Monitoring of V to GND. REF Charge and Discharge of Batteries For maximum versatility, the 76V input voltage range Bidirectional (MAX4081) or Unidirectional applies independently to both supply voltage (V ) and CC (MAX4080) I SENSE common-mode input voltage (V ). High-side current RS+ Reference Input for Bidirectional OUT (MAX4081) monitoring does not interfere with the ground path of the Minimizes Required Board Space load being measured, making the MAX4080/MAX4081 8-Pin MAX Package particularly useful in a wide range of high-voltage sys- tems. Ordering Information The combination of three gain versions (5V/V, 20V/V, PART TEMP RANGE PIN-PACKAGE 60V/V = F, T, S suffix) and a user-selectable, external MAX4080FAUA+ -40 C to +125 C 8 MAX sense resistor sets the full-scale current reading and its proportional output voltage. The MAX4080/MAX4081 MAX4080FAUA/V+ -40 C to +125 C 8 MAX offer a high level of integration, resulting in a simple, accu- MAX4080FASA+ -40 C to +125 C 8 SO rate, and compact current-sense solution. MAX4080TAUA+ -40 C to +125 C 8 MAX The MAX4080/MAX4081 operate from a 4.5V to 76V sin- MAX4080TAUA/V+ -40 C to +125 C 8 MAX gle supply and draw only 75A of supply current. These +Denotes a lead(Pb)-free/RoHS-compliant package. devices are specified over the automotive operating tem- /V denotes an automotive qualified part. perature range (-40C to +125C) and are available in a Ordering Information continued at end of data sheet. space-saving 8-pin MAX or SO package. Selector Guide appears at end of data sheet. Applications Pin Configurations Automotive (12V, 24V, or 42V Batteries) TOP VIEW 48V Telecom and Backplane Current Measurement Bidirectional Motor Control + + RS+ 1 8 RS- RS+ 1 8 RS- Power-Management Systems Avalanche Photodiode and PIN-Diode Current V 2 7 N.C. V 2 7 REF1A CC CC MAX4080 MAX4081 Monitoring N.C. 3 6 N.C. N.C. 3 6 REF1B General System/Board-Level Current Sensing GND 4 5 OUT GND 4 5 OUT Precision High-Voltage Current Sources MAX/SO MAX/SO MAX is a registered trademark of Maxim Integrated Products, Inc. 19-2562 Rev 6 12/20MAX4080/MAX4081 76V, High-Side, Current-Sense Amplifiers with Voltage Output Absolute Maximum Ratings V to GND ..........................................................-0.3V to +80V Continuous Power Dissipation (T = +70C) CC A RS+, RS- to GND ..................................................-0.3V to +80V 8-Pin MAX (derate 4.5mW/C above +70C) ............362mW OUT to GND .......... -0.3V to the lesser of +18V or (V + 0.3V) 8-Pin SO (derate 5.88mW/C above +70C) ...............471mW CC REF1A, REF1B to GND Operating Temperature Range ......................... -40C to +125C (MAX4081 Only) -0.3V to the lesser of +18V or (V + 0.3V) Junction Temperature ......................................................+150C CC Output Short Circuit to GND......................................Continuous Storage Temperature Range ............................ -65C to +150C Differential Input Voltage (V - V ) ..............................80V Lead Temperature (soldering, 10s) .................................+300C RS+ RS- Current into Any Pin .........................................................20mA Soldering Temperature (reflow) .......................................+260C 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 (V = V = 4.5V to 76V, V = V = 5V (MAX4081 only), V = (V - V ) = 0V, R = 100k, T = T to CC RS+ REF1A REF1B SENSE RS+ RS- LOAD A MIN T , unless otherwise noted. Typical values are at T = +25C.) (Notes 1, 2) MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range VCC Inferred from PSRR test 4.5 76 V Common-Mode Range CMVR Inferred from CMRR test (Note 3) 4.5 76 V MAX4080 75 190 VCC = VRS+ = 76V, Supply Current ICC A no load MAX4081 103 190 Leakage Current IRS+, IRS- VCC = 0V, VRS+ = 76V 0.01 2 A Input Bias Current IRS+, IRS- VCC = VRS+ = 76V 5 12 A MAX4080F/MAX4081F 1000 Full-Scale Sense Voltage VSENSE MAX4080T/MAX4081T 250 mV (Note 4) MAX4080S/MAX4081S 100 MAX4080F/MAX4081F 5 Gain AV MAX4080T/MAX4081T 20 V/V MAX4080S/MAX4081S 60 TA = +25C 0.1 0.6 VCC = VRS+ = 48V Gain Accuracy DAV TA = -40C to +85 C 1 % (Note 5) TA = TMIN to TMAX 1.2 TA = +25C 0.1 0.6 VCC = VRS+ = 48V Input Offset Voltage VOS TA = -40C to +85 C 1 mV (Note 6) TA = TMIN to TMAX 1.2 Common-Mode Rejection Ratio CMRR VCC = 48V, VRS+ = 4.5V to 76V 100 124 dB (Note 7) Power-Supply Rejection Ratio PSRR VRS+ = 48V, VCC = 4.5V to 76V 100 122 dB (Note 7) MAX4080F/MAX4081F, VCC = 4.5V, VRS+ VSENSE = 1000mV = 48V, VREF1A = MAX4080T/MAX4081T, (VCC OUT High Voltage VREF1B = 2.5V, 0.15 0.27 V VOH) VSENSE = 250mV IOUT (sourcing) = MAX4080S/MAX4081S, +500A (Note 8) VSENSE = 100mV Maxim Integrated 2 www.maximintegrated.com