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Analog Devices Inc./Maxim Integrated MAX4080FAUA+T
- Part No.:
- MAX4080FAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4080FAUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,486
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Product details
Overview
MAX4080FAUA+T from Maxim Integrated is a unidirectional, high-side current-sense amplifier with 5V/V gain, 4.5V–76V common-mode input range, ±0.1% full-scale accuracy, and 100µV max input offset voltage. It operates over –40°C to +125°C and draws only 75µA supply current, enabling precision battery and telecom current monitoring in space-constrained automotive and industrial systems.
For engineers reviewing the MAX4080FAUA+T datasheet, MAX4080FAUA+T pinout, MAX4080FAUA+T application, or MAX4080FAUA+T equivalent, key selection criteria include its 5V/V fixed gain, µMAX-8 package footprint, unidirectional sensing capability, high CMRR (100 dB min), and compatibility with 1000mV full-scale sense voltage for accurate low-loss current measurement.
Technical Context
The MAX4080FAUA+T implements a precision current mirror-based architecture that amplifies the differential voltage across an external sense resistor (RS+ to RS–) without loading the monitored high-voltage rail. Its input stage operates independently of VCC, allowing common-mode voltages up to 76V even when supply is as low as 4.5V.
Unlike bidirectional variants (e.g., MAX4081), the MAX4080FAUA+T outputs a single-ended voltage proportional to VSENSE = (RS+ − RS–), with no reference input required. Output swing ranges from near GND to within 0.27V of VCC at 500µA sourcing, supporting direct interface to 3.3V/5V ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 5V/V - delivers 5V output per 1V sense voltage; enables 1000mV full-scale VSENSE for 5V output span |
| Common-Mode Range | 4.5V to 76V - supports monitoring of 12V/24V/48V/72V battery and telecom rails without ground interference |
| Full-Scale Sense Voltage | ±1000mV - sets maximum measurable differential voltage before saturation; defines RSENSE selection baseline |
| Input Offset Voltage | ±0.1mV (typ) at +25°C - contributes ≤0.01% error at 1000mV VSENSE, critical for low-current accuracy |
| Supply Current | 75µA (max at 76V) - enables always-on current monitoring in power-sensitive battery systems |
| Accuracy | ±0.1% full-scale (typ) - guarantees <±1mV absolute error at 1000mV VSENSE, suitable for metrology-grade applications |
| Bandwidth | 250kHz - supports fast transient detection in motor control and power-supply fault protection |
Pinout & Package
MAX4080FAUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for high-density PCB layouts in automotive and telecom modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input | Connects to positive terminal of external current-sense resistor; withstands up to 76V common-mode |
| 2 VCC | Supply voltage input | Accepts 4.5V–76V independent of RS+; requires ≥0.1µF ceramic bypass 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 with low-impedance trace |
| 5 OUT | Voltage output | Delivers VOUT = 5 × VSENSE; swings from ~0.15V above GND to within 0.27V of VCC at 500µA load |
| 8 RS− | Low-side sense input | Connects to negative terminal of sense resistor; completes differential input path with RS+ |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional high-side sensing | Eliminates ground-path disruption in battery-powered systems; enables true load-current measurement without shunt grounding |
| Independent 4.5V–76V VCC and CMVR | Permits operation with supply derived from low-voltage regulator while monitoring 72V bus - no level-shifting needed |
| ±0.1% full-scale gain accuracy | Reduces calibration burden in production; maintains <±5mV absolute error across temperature and supply variations |
| 75µA ultra-low quiescent current | Extends battery life in always-on monitoring applications such as smart-battery fuel gauging and backup power supervision |
| 8-pin µMAX package | Provides 40% smaller footprint than SO-8; supports >2× higher board density in space-constrained EV and telecom modules |
Applications
| Automotive Battery Monitoring | 48V Telecom Power System |
|---|---|
|
Use Scenario: Real-time monitoring of starter battery discharge during cold-cranking and alternator charge current post-ignition. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring bidirectional current via external shunt; provides analog output to MCU ADC. Use Value: Enables precise state-of-charge estimation and overcurrent protection without compromising ground integrity of safety-critical ECUs. |
Use Scenario: Continuous current measurement on 48V DC distribution rails in central office power shelves and base station rectifiers. IC Role / Device Role / Timing Role: Unidirectional high-side amplifier interfacing with isolated ADC to report load current to system supervisor. Use Value: Maintains 76V common-mode tolerance and ±0.1% accuracy across -40°C to +125°C, ensuring reliability in uncontrolled telecom environments. |
| Precision Power-Management Systems | Industrial Motor Drive Protection |
|
Use Scenario: Accurate current feedback in programmable DC power supplies and lab-grade electronic loads. IC Role / Device Role / Timing Role: Fixed-gain (5V/V) current sensor converting shunt voltage to calibrated analog output for closed-loop regulation. Use Value: Delivers 100µV offset and 250kHz bandwidth to support fast current limiting and dynamic load step response. |
Use Scenario: Overcurrent detection in BLDC motor phase-leg drivers operating from 24V–60V DC buses. IC Role / Device Role / Timing Role: High-side sense amplifier placed upstream of H-bridge to detect shoot-through or stall conditions. Use Value: Withstands 76V transients and responds within 20µs to 1% of final value, enabling sub-50µs fault shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4080FASA+ | Same gain (5V/V), same specs, but in 8-pin SO package (5mm × 4mm) | Larger footprint; better thermal dissipation; compatible with wave-solder processes | Select for legacy SO-8 layouts or where µMAX reflow yield is a concern |
| INA240A1QDGKRQ1 | 5V/V gain, AEC-Q100 qualified, 80V CMVR, 120µA IQ, ±20µV VOS (typ) | Lower offset improves sub-amp accuracy; automotive grade; different pinout (SO-8) | Choose for new automotive designs requiring AEC-Q100 compliance and tighter offset spec |
Compared with MAX4080FASA+, the MAX4080FAUA+T saves 40% board area; compared with INA240A1QDGKRQ1, it offers lower quiescent current and superior gain accuracy (±0.1% vs ±0.3%), making it preferable for battery-backed and metrology-critical applications.
Availability
MAX4080FAUA+T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power systems, and industrial motor drive protection requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4080FAUA+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) is a semiconductor leader specializing in precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX4080/MAX4081 family was designed specifically for high-voltage, high-accuracy current sensing in safety-critical and energy-efficient systems where ground-path integrity and measurement fidelity are non-negotiable.
FAQ
What is the maximum common-mode voltage supported by the MAX4080FAUA+T?
The MAX4080FAUA+T supports a common-mode input voltage range of 4.5V to 76V - independently of its supply voltage (VCC). This allows it to monitor current on high-voltage rails such as 48V telecom systems or 72V industrial batteries while operating from a lower-voltage auxiliary supply. Absolute maximum rating extends to 80V, but functional operation is guaranteed only up to 76V.
Does the MAX4080FAUA+T require an external reference voltage?
No, the MAX4080FAUA+T does not require an external reference voltage. As a unidirectional current-sense amplifier, it outputs VOUT = 5 × VSENSE directly, referenced to GND. In contrast, the bidirectional MAX4081 variants require REF1A/REF1B inputs to set the zero-current output level - a distinction confirmed in the device's pin description and functional diagrams.
What is the full-scale sense voltage range for the MAX4080FAUA+T?
The MAX4080FAUA+T has a full-scale sense voltage (VSENSE) of ±1000mV, meaning it accurately measures differential voltages from –1000mV to +1000mV across the external sense resistor. At 5V/V gain, this yields a 0V to 5V output span for unidirectional use - ideal for interfacing with standard 5V or 3.3V ADCs without signal conditioning.
Can the MAX4080FAUA+T be used in automotive applications?
Yes, the MAX4080FAUA+T is specified for operation from –40°C to +125°C and is offered in a RoHS-compliant, lead(Pb)-free µMAX package. While the base part is not AEC-Q100 qualified, its temperature rating, 76V robustness, and low 75µA supply current make it suitable for non-safety-critical automotive subsystems such as body control modules, infotainment power monitoring, and 12V/24V battery telemetry.
How does the MAX4080FAUA+T differ from the MAX4080TAUA+?
The MAX4080FAUA+T features 5V/V gain and supports ±1000mV full-scale VSENSE, whereas the MAX4080TAUA+ offers 20V/V gain and ±250mV full-scale VSENSE. Both share identical package, temperature range, and architecture - the suffix 'F' vs 'T' denotes gain version only. Selection depends on required sense-resistor voltage drop: F-version suits higher-current, lower-resistance shunts; T-version enables finer resolution at lower currents.
MAX4080FAUA+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:
- 250 kHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 75µA
- 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
MAX4080FAUA+T FAQ
1.How can I place an order for MAX4080FAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4080FAUA+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 MAX4080FAUA+T reliable?
The price and inventory of MAX4080FAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4080FAUA+T is usually 5 days.
3.What payment methods are accepted for MAX4080FAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4080FAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4080FAUA+T?
MAX4080FAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4080FAUA+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 MAX4080FAUA+T?
For technical support, including MAX4080FAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4080FAUA+T requirements.
6.How does Aetrix verify that MAX4080FAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4080FAUA+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 MAX4080FAUA+T meets industry standards.
7.What is the process for return or replacement of MAX4080FAUA+T?
All MAX4080FAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4080FAUA+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 MAX4080FAUA+T part is unused and in its original packaging.
Return procedure for MAX4080FAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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