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Analog Devices Inc./Maxim Integrated MAX4081SAUA+
- Part No.:
- MAX4081SAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4081SAUA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
MAX4081SAUA+ from Maxim Integrated is a bidirectional, high-side current-sense amplifier with 60V/V gain, 76V common-mode input range (4.5V to 76V), ±50mV full-scale sense voltage, and operation over –40°C to +125°C. It delivers 150kHz bandwidth, ±0.1% gain accuracy at +25°C, and 103µA supply current - enabling precise battery charge/discharge monitoring in automotive and telecom power systems.
For engineers reviewing the MAX4081SAUA+ datasheet, MAX4081SAUA+ pinout, MAX4081SAUA+ application, or MAX4081SAUA+ equivalent, key selection considerations include its bidirectional sensing capability, external reference interface (REF1A/REF1B), µMAX-8 package footprint, and compatibility with high-voltage battery rails up to 76V without ground-path interference.
Technical Context
The MAX4081SAUA+ implements a precision current mirror-based architecture that maintains constant input terminal voltages across RS+ and RS− during bidirectional sensing, enabling accurate VSENSE = (VRS+ − VRS−) measurement independent of supply voltage. Its output stage level-shifts relative to an externally applied reference (VREF), producing VOUT = VREF ± (VSENSE × 60) for polarity-resolved current detection.
Unlike unidirectional variants, the MAX4081SAUA+ requires dual reference inputs (REF1A and REF1B) to define zero-current output level; VREF is the average of these pins. The device supports rail-to-rail output swing above/below VREF - from VREF to VCC for charging current and from VREF to GND for discharging current - with no separate polarity output pin needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V - sets full-scale output to ±3.0V for ±50mV sense voltage, optimizing ADC dynamic range in low-current applications. |
| Common-Mode Input Range | 4.5V to 76V - enables direct connection to 12V/24V/48V battery rails without level-shifting or isolation. |
| Full-Scale Sense Voltage | ±50mV - minimizes I²R loss and thermal drift in high-current shunt resistors while maintaining resolution. |
| Supply Current | 103µA typical - supports always-on battery monitoring in energy-constrained smart-battery systems. |
| Gain Accuracy | ±0.1% at +25°C - ensures <±0.5% total error budget when combined with 0.1% shunt resistor tolerance. |
| Input Offset Voltage | ±0.1mV at +25°C - contributes <±0.2% error at full scale, critical for sub-amp current resolution. |
| Bandwidth | 150kHz - supports real-time response to fast load transients in motor control and DC-DC converter feedback loops. |
Pinout & Package
MAX4081SAUA+ is housed in an 8-pin µMAX® package (package code U8+1), measuring 3.0mm × 3.0mm × 0.8mm with 0.65mm lead pitch. This RoHS-compliant, lead-free surface-mount package supports high-density PCB layouts and meets automotive AEC-Q100 stress requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input positive | Connects to battery or power rail side of shunt; withstands up to +80V absolute max. |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply; decoupled with ≥0.1µF ceramic capacitor to GND. |
| 3,6,7 N.C. | No internal connection | Leads may be left floating or tied to GND for mechanical stability; no electrical function. |
| 4 GND | Analog ground reference | Return path for internal circuitry; must be connected to system ground plane with low-impedance trace. |
| 5 OUT | Voltage output | Delivers VREF ± (60 × VSENSE); swing limited to VREF–GND and VREF–VCC ranges. |
| 8 RS− | High-side sense input negative | Connects to load side of shunt; differential input accepts ±80V max voltage across RS+/RS−. |
| - REF1A | Reference input A | Defines VREF as average of REF1A and REF1B; connect to stable low-noise voltage source. |
| - REF1B | Reference input B | Completes reference pair; tie to REF1A or GND depending on VREF scaling configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Single OUT pin resolves charge/discharge polarity via reference-centered output swing - eliminates need for dual-output IC or external logic. |
| User-configurable reference interface | REF1A/REF1B inputs allow flexible VREF setting (e.g., 2.5V or 5V) or halved reference via REF1B-to-GND connection - simplifies ADC interfacing across multiple supply domains. |
| 76V independent common-mode and supply range | Enables direct monitoring of 48V telecom backplanes or 72V EV auxiliary batteries without auxiliary supplies or isolation - reduces BOM count and layout complexity. |
| ±0.1% gain accuracy at +25°C | Supports high-accuracy state-of-charge estimation in battery management systems without factory calibration - lowers production test cost. |
| 150kHz bandwidth with 20µs settling | Meets real-time current loop requirements in brushless DC motor controllers and active rectifier feedback paths - avoids phase lag-induced instability. |
Applications
| Automotive Smart Battery Monitoring | 48V Telecom Backplane Protection |
|---|---|
Use Scenario: Real-time tracking of Li-ion battery pack charge/discharge cycles in ADAS ECUs and infotainment gateways. IC Role / Device Role / Timing Role: High-side bidirectional current sensor feeding analog input of microcontroller ADC with polarity-resolved output referenced to internal LDO. Use Value: Enables accurate coulomb counting and SoH estimation using single-chip solution with no external polarity logic or dual op-amps. |
Use Scenario: Continuous current supervision of 48V DC distribution boards in central office switching equipment. IC Role / Device Role / Timing Role: High-voltage sense amplifier interfaced to protection MCU, providing fast overcurrent detection before fuse blow time. Use Value: Delivers 150kHz response to short-circuit events while operating directly from 48V rail - eliminates isolated sense transformer and associated latency. |
| Bidirectional Motor Control Feedback | Precision High-Voltage Current Source Calibration |
Use Scenario: Closed-loop current regulation in industrial servo drives with regenerative braking capability. IC Role / Device Role / Timing Role: Bidirectional shunt monitor feeding analog input of PWM controller, supporting both motoring and generating quadrants. Use Value: Maintains ±0.1% gain accuracy across –40°C to +125°C, ensuring consistent torque control without temperature compensation firmware. |
Use Scenario: Calibration-grade current measurement in programmable HV power supplies for semiconductor test equipment. IC Role / Device Role / Timing Role: Precision high-side amplifier with 103µA quiescent current and ±0.1mV offset, referenced to metrology-grade voltage standard. Use Value: Achieves <0.2% total error at full scale with 0.1% shunt, meeting Class 0.5 accuracy requirements per IEC 61000-4-30. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 500kHz bandwidth, integrated 20ppm/°C gain drift compensation, but only 80V abs max on RS+; requires external reference buffer. | Preferred for high-speed motor control where >200kHz response is mandatory; less suitable for 76V battery monitoring due to lower voltage margin. | Select INA240A1QDRQ1 when bandwidth >200kHz is required and supply voltage ≤80V; verify RS+ voltage derating per AEC-Q100 stress limits. |
| ACS724LLCTR-20AU-T | Integrated Hall-effect sensor, 20A range, 1.2ms response, galvanic isolation, but ±1.5% total error and no user-selectable reference. | Suitable for non-precision overload detection in AC/DC converters; not viable for battery SoC estimation due to offset drift and lack of bipolar zero-reference. | Choose ACS724LLCTR-20AU-T for cost-sensitive isolation-critical applications where ±2% accuracy suffices and response time >1ms is acceptable. |
Compared with INA240A1QDRQ1 and ACS724LLCTR-20AU-T, the MAX4081SAUA+ offers superior gain accuracy (±0.1% vs. ±0.3% and ±1.5%) and true 76V common-mode operation - making it optimal for high-precision, high-voltage bidirectional monitoring where reference flexibility and temperature stability are critical.
Availability
MAX4081SAUA+ is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, bidirectional motor control, and precision HV current source calibration requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4081SAUA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX4080/MAX4081 family was engineered specifically for high-voltage, high-accuracy bidirectional current sensing in battery-powered and telecom infrastructure systems - prioritizing wide common-mode range, low offset, and reference-flexible output architecture.
FAQ
What is the maximum common-mode voltage the MAX4081SAUA+ can handle?
The MAX4081SAUA+ supports a common-mode input range from 4.5V to 76V - meaning RS+ and RS− terminals can operate up to +80V absolute maximum per Absolute Maximum Ratings. This allows direct connection to 48V telecom rails and 72V EV auxiliary systems without attenuation or isolation. The 76V rating applies independently of VCC, enabling operation even when VCC is derived from a lower-voltage auxiliary supply.
How does the MAX4081SAUA+ achieve bidirectional sensing with only one output pin?
The MAX4081SAUA+ uses external reference inputs (REF1A and REF1B) to establish a user-defined zero-current output level (VREF). When VSENSE = 0, VOUT = VREF. Positive VSENSE produces VOUT > VREF (charge current), and negative VSENSE yields VOUT < VREF (discharge current). This reference-centered output eliminates the need for dual outputs or external comparators - the single OUT pin inherently encodes direction and magnitude.
What is the full-scale sense voltage for the MAX4081SAUA+ and how is it determined?
The MAX4081SAUA+ has a full-scale sense voltage of ±50mV, corresponding to its 60V/V gain version (S suffix). This value is fixed by internal resistor ratios and confirmed in the DC Electrical Characteristics table. At ±50mV input, the output swings ±3.0V around VREF - e.g., if VREF = 2.5V, VOUT ranges from –0.5V to +5.5V, constrained by VCC and GND rails.
Can the MAX4081SAUA+ operate with VCC lower than the common-mode voltage?
Yes - the MAX4081SAUA+ features independent VCC and common-mode voltage ranges. VCC may be as low as 4.5V while RS+ operates at 76V, enabling use in systems where the sense node floats far above the local supply rail. This decoupling eliminates the need for charge pumps or isolated supplies, simplifying design in high-side monitoring applications such as battery disconnect circuits and HV DC-DC converters.
What package type and footprint does the MAX4081SAUA+ use?
The MAX4081SAUA+ uses the 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), a 3.0mm × 3.0mm surface-mount package with 0.65mm lead pitch. It is RoHS-compliant (+ suffix), qualified for automotive temperature range (–40°C to +125°C), and compatible with standard reflow soldering profiles including peak temperature up to +260°C.
MAX4081SAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 103µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 76 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4081SAUA+ FAQ
1.How can I place an order for MAX4081SAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081SAUA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4081SAUA+ reliable?
The price and inventory of MAX4081SAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081SAUA+ is usually 5 days.
3.What payment methods are accepted for MAX4081SAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081SAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081SAUA+?
MAX4081SAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081SAUA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4081SAUA+?
For technical support, including MAX4081SAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081SAUA+ requirements.
6.How does Aetrix verify that MAX4081SAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4081SAUA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4081SAUA+ meets industry standards.
7.What is the process for return or replacement of MAX4081SAUA+?
All MAX4081SAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081SAUA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4081SAUA+ part is unused and in its original packaging.
Return procedure for MAX4081SAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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