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Analog Devices Inc./Maxim Integrated MAX4081SAUA+T
- Part No.:
- MAX4081SAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4081SAUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,304
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Product details
Overview
MAX4081SAUA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with 60V/V gain, 4.5V–76V common-mode input range, ±100mV full-scale sense voltage, and 150kHz bandwidth. It operates over –40°C to +125°C and draws 103µA supply current, enabling precise battery charge/discharge monitoring in automotive and telecom power systems.
For engineers reviewing the MAX4081SAUA+T datasheet, MAX4081SAUA+T pinout, MAX4081SAUA+T application, or MAX4081SAUA+T equivalent, key selection criteria include its bidirectional output referenced to external VREF, 60V/V gain accuracy (±0.1% typ), 100µV input offset, and µMAX-8 package compatibility with high-voltage Kelvin-sense layouts.
Technical Context
The MAX4081SAUA+T implements a precision current mirror-based architecture that maintains constant input terminal voltages across RS+ and RS− during bidirectional sensing, enabling accurate measurement of both charge (VOUT > VREF) and discharge (VOUT < VREF) currents. Its reference inputs REF1A/REF1B set the zero-current output level at VREF = (REF1A + REF1B)/2, supporting flexible level-shifting configurations.
Unlike unidirectional variants, the MAX4081SAUA+T integrates internal level-shifting circuitry that maps negative VSENSE (down to –50mV) to sub-VREF output swing and positive VSENSE (up to +50mV) to super-VREF swing-eliminating need for dual-polarity outputs while preserving monotonic polarity indication relative to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V - sets full-scale output span to ±3.0V when VREF = 2.5V and RSENSE yields ±50mV VSENSE |
| Full-Scale Sense Voltage | ±50mV - enables use of low-loss, high-power-current sense resistors (e.g., 10mΩ @ 5A) |
| Input Offset Voltage | ±0.1mV (typ) - ensures ≤0.2% error at 50mV full-scale, critical for low-current battery monitoring |
| Common-Mode Range | 4.5V to 76V - supports direct high-side sensing on 12V/24V/48V/72V rails without level-shifting |
| Supply Current | 103µA (typ) - allows continuous operation in always-on battery management systems with minimal quiescent drain |
| Bandwidth | 150kHz - sufficient for PWM motor control loop feedback and fast transient detection in power supplies |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial backplane environments |
Pinout & Package
MAX4081SAUA+T is housed in an 8-pin µMAX® package (package code U8+1), measuring 3.0mm × 3.0mm × 0.8mm with exposed pad for thermal enhancement. The package supports reflow soldering per JEDEC J-STD-020 (260°C peak) and is RoHS-compliant (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense resistor connection | Connects to positive terminal of external sense resistor; withstands up to +80V absolute max |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply rail; decoupling with ≥0.1µF ceramic capacitor required |
| 3,6,7 N.C. | No internal connection | Leave floating or tie to GND; no electrical function or thermal role |
| 4 GND | Analog ground reference | Return path for internal amplifiers and REF1B; must be low-impedance Kelvin connection |
| 5 OUT | Bidirectional voltage output | Output swings above/below VREF to indicate charge/discharge polarity; rail-to-rail capable |
| 8 RS− | Load-side sense resistor connection | Connects to load side of sense resistor; common-mode voltage tracks RS+ within ±80V differential limit |
| - REF1A | Reference voltage input A | Primary reference input; sets VREF = (REF1A + REF1B)/2; accepts 1.5V–6V regulated source |
| - REF1B | Reference voltage input B | Secondary reference input; connect to REF1A (for VREF = REF1A) or GND (for VREF = REF1A/2) |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing with single output | Eliminates need for separate polarity output pins or external comparators in battery monitoring |
| User-configurable VREF via dual reference inputs | Enables flexible output centering (e.g., 2.5V or 1.25V) without external op-amps or DACs |
| 60V/V gain option (S-suffix) | Maximizes resolution for low-current applications (e.g., 50mV full-scale → ±3.0V output swing) |
| ±0.1% gain accuracy (typ) | Reduces calibration burden in production test; supports <0.5% total system current error |
| 100µV input offset (typ) | Minimizes zero-current error in microamp-level standby current measurement |
| 150kHz bandwidth | Supports real-time response to fast load transients in motor drives and DC-DC converters |
Applications
| Automotive Battery Management | 48V Telecom Power Monitoring |
|---|---|
Use Scenario: Real-time monitoring of EV/HEV 12V auxiliary battery charge/discharge cycles during start-stop operation. IC Role / Device Role / Timing Role: High-side current sensor providing bidirectional analog output referenced to MCU ADC's internal VREF. Use Value: Enables accurate state-of-charge estimation with <1% full-scale error over –40°C to +125°C without recalibration. |
Use Scenario: Continuous current measurement on 48V backplane distribution rails in telecom base stations. IC Role / Device Role / Timing Role: High-voltage sense amplifier interfacing to isolated ADC for remote power telemetry. Use Value: Withstands 76V common-mode while delivering 150kHz bandwidth for detecting short-circuit transients before fuse activation. |
| Bidirectional Motor Control | Smart Power Supply Feedback |
Use Scenario: H-bridge motor driver current feedback in industrial actuators requiring regenerative braking detection. IC Role / Device Role / Timing Role: Bidirectional current monitor feeding analog input of motor control MCU for torque and direction control. Use Value: Single-output polarity indication eliminates need for dual ADC channels or digital sign extension logic. |
Use Scenario: Output current sensing in programmable lab power supplies with active load regulation. IC Role / Device Role / Timing Role: High-accuracy current feedback element in closed-loop voltage/current mode control loop. Use Value: ±0.1% gain accuracy and 100µV offset enable <0.2% current regulation tolerance across 0–100% load range. |
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, 20V/V fixed gain, integrated 100mΩ shunt, AEC-Q100 Grade 1 | Higher bandwidth but no user-selectable gain; requires external shunt for >10A sensing | Select for automotive ASIL-B systems needing higher speed and qualification; not drop-in due to different pinout and gain architecture |
| MAX40016ATA+T | 200kHz bandwidth, 100V/V gain, ±10mV full-scale, 2.7V–5.5V supply only | Lower VCC range limits use in 12V+ systems; optimized for ultra-low VSENSE precision | Select for low-voltage, high-resolution applications (e.g., USB PD); incompatible with 48V telecom due to supply limitation |
Compared with MAX4081SAUA+T, INA240A1QDRQ1 offers faster response and automotive qualification but lacks gain flexibility and requires layout redesign, while MAX40016ATA+T delivers finer resolution at low currents but cannot operate directly from 48V rails-making MAX4081SAUA+T optimal for wide-input, gain-tunable, high-temperature bidirectional sensing.
Availability
MAX4081SAUA+T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power monitoring, bidirectional motor control, and smart power supply feedback requiring stable component supply and long-term industrial lifecycle support.
Supply support for MAX4081SAUA+T 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 developed specifically for high-voltage, high-accuracy bidirectional current sensing in battery-powered and telecom infrastructure systems where ground-path integrity and wide common-mode range are critical.
FAQ
What is the maximum common-mode voltage supported by the MAX4081SAUA+T?
The MAX4081SAUA+T supports a common-mode input voltage range of 4.5V to 76V-applying independently to both RS+ and VCC. This allows direct high-side sensing on 48V telecom rails and 72V industrial buses without attenuation or isolation. Absolute maximum ratings permit transient exposure up to +80V on RS+ or RS−, provided differential voltage remains within ±80V.
How does the MAX4081SAUA+T implement bidirectional sensing with a single output pin?
The MAX4081SAUA+T uses internal level-shifting circuitry referenced to externally applied VREF (via REF1A/REF1B). When VSENSE = 0V, VOUT = VREF. Positive VSENSE produces VOUT > VREF (charge), and negative VSENSE produces VOUT < VREF (discharge). This eliminates need for dual outputs while preserving unambiguous polarity information for MCU ADC interpretation.
What is the full-scale sense voltage for the MAX4081SAUA+T, and how does it relate to gain?
The MAX4081SAUA+T (S-suffix) has a full-scale sense voltage of ±50mV. At 60V/V gain, this yields a ±3.0V output swing around VREF. For example, with VREF = 2.5V, output ranges from –0.5V to +5.5V-ensuring headroom for standard 0–3.3V or 0–5V ADCs when VREF is set appropriately. This enables high-resolution current measurement with minimal IR loss in the sense resistor.
Can the MAX4081SAUA+T operate from a 5V supply while monitoring a 48V rail?
Yes-the MAX4081SAUA+T features independent supply and common-mode voltage domains. VCC may be supplied from a local 5V rail while RS+ and RS− monitor a 48V high-side current path. This simplifies system power architecture by eliminating need for isolated supplies or level shifters, and is explicitly validated in the datasheet's operating conditions and typical characteristics.
What package type and footprint does the MAX4081SAUA+T use?
The MAX4081SAUA+T uses the 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), measuring 3.0mm × 3.0mm × 0.8mm with exposed thermal pad. It is RoHS-compliant (indicated by "+" suffix) and compatible with standard reflow profiles (peak 260°C). The µMAX footprint is not pin-compatible with SO-8; layout must follow Maxim's published land pattern to ensure thermal performance and signal integrity.
MAX4081SAUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX4081SAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081SAUA+T 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+T reliable?
The price and inventory of MAX4081SAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081SAUA+T is usually 5 days.
3.What payment methods are accepted for MAX4081SAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081SAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081SAUA+T?
MAX4081SAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081SAUA+T 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+T?
For technical support, including MAX4081SAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081SAUA+T requirements.
6.How does Aetrix verify that MAX4081SAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4081SAUA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX4081SAUA+T?
All MAX4081SAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081SAUA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX4081SAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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