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Analog Devices Inc./Maxim Integrated MAX4080FASA-T
- Part No.:
- MAX4080FASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4080FASA-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
MAX4080FASA-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 precise battery-current monitoring in automotive 12V/24V systems and telecom backplanes.
For engineers reviewing the MAX4080FASA-T datasheet, MAX4080FASA-T pinout, MAX4080FASA-T application, or MAX4080FASA-T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated SO-8 pin functions, application-specific use-value analysis, and two confirmed alternative parts with documented functional and selection trade-offs.
Technical Context
The MAX4080FASA-T uses a precision bipolar architecture to achieve independent 4.5V–76V operation on both VCC and RS+ inputs, enabling high-side sensing without ground-path interference. Its internal current-mirror topology with fixed gain-setting resistors (RG1 = RG2 = 160kΩ for 5V/V) ensures stable amplification of VSENSE across wide temperature and supply ranges.
Unlike bidirectional variants, the MAX4080FASA-T outputs a single-ended voltage proportional to VSENSE (VOUT = VSENSE × 5), eliminating need for external reference or polarity handling. It supports full-scale sense voltages up to ±1000mV and maintains CMRR ≥100dB and PSRR ≥100dB across its operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 5V/V - sets output scaling so 1000mV sense voltage yields 5.0V output, simplifying ADC interface design |
| Common-Mode Input Range | 4.5V to 76V - enables direct monitoring of 12V/24V/48V battery rails without level-shifting or isolation |
| Full-Scale Sense Voltage | ±1000mV - allows use of low-value, low-power sense resistors (e.g., 1mΩ at 1000A) while maintaining signal integrity |
| Input Offset Voltage | ±0.1mV (typ) at +25°C - contributes <0.01% error at full scale, critical for battery SOC estimation accuracy |
| Supply Current | 75µA (max) - enables always-on current monitoring in low-power automotive modules without battery drain penalty |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive placement and industrial power management environments |
| Bandwidth | 250kHz - supports fast transient detection in motor control and DC-DC converter current limiting loops |
Pinout & Package
MAX4080FASA-T is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, RoHS-compliant, and rated for automotive temperature range (–40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense resistor connection (positive terminal) | Connects directly to battery or power rail; withstands up to 76V common-mode potential |
| 2 VCC | Supply voltage input | Independent 4.5V–76V operation allows VCC to be tied to RS+ or separate regulated rail |
| 3,6,7 N.C. | No internal connection | Leaving unconnected avoids parasitic coupling; grounding permitted but not required |
| 4 GND | Analog ground reference | Must be connected to system ground plane; Kelvin layout recommended for low-noise sensing |
| 5 OUT | Voltage output (unidirectional) | Delivers 0–5V output proportional to VSENSE × 5; compatible with 3.3V/5V ADC inputs |
| 8 RS− | High-side sense resistor connection (negative terminal) | Connects to load side of sense resistor; forms differential input pair with RS+ |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional high-side sensing | Eliminates ground-loop disruption in battery-powered systems; preserves load ground integrity |
| ±0.1% full-scale gain accuracy | Enables <1% total current measurement error without calibration, reducing BOM cost and firmware overhead |
| 76V independent common-mode and supply range | Supports direct integration into 48V telecom, 24V truck, and 12V passenger vehicle architectures |
| 8-pin SO package | Standard footprint compatible with automated assembly; no µMAX-specific layout constraints |
| 250kHz bandwidth | Meets response time requirements for overcurrent protection in switching power supplies and motor drivers |
Applications
| Automotive Battery Monitoring | 48V Telecom Backplane Sensing |
|---|---|
Use Scenario: Real-time monitoring of starter battery discharge during cold cranking and alternator charge current post-cranking. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level RSENSE voltage to clean 0–5V analog output for MCU ADC sampling. Use Value: Enables accurate state-of-charge (SOC) estimation with <0.5% full-scale error, supporting predictive maintenance and start-stop optimization. |
Use Scenario: Continuous current measurement on 48V DC distribution bus feeding multiple line cards in telecom central office equipment. IC Role / Device Role / Timing Role: Unidirectional high-side monitor providing isolated current feedback to system supervisor IC for load balancing and fault reporting. Use Value: Maintains 250kHz bandwidth and 76V common-mode tolerance to capture fast transients during hot-swap events without saturation. |
| Industrial Power Supply OCP | Precision High-Voltage Current Source |
Use Scenario: Overcurrent protection loop in programmable DC power supply delivering 0–60V/0–10A with digital setpoint control. IC Role / Device Role / Timing Role: Fast-response current sensor feeding analog comparator for sub-10µs trip response, backed by 75µA quiescent current for standby mode. Use Value: Delivers 20µs settling time and ±100µV offset to ensure trip threshold repeatability within ±0.1% across temperature. |
Use Scenario: Closed-loop regulation of high-stability 76V current source for avalanche photodiode bias in optical test equipment. IC Role / Device Role / Timing Role: Precision unidirectional amplifier measuring sense resistor voltage to generate feedback for op-amp-controlled pass element. Use Value: Achieves ±0.1% gain accuracy and 100dB CMRR to reject noise from high-voltage bias rail, ensuring sub-nA current stability. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V fixed gain, 80V common-mode, 120µA IQ, AEC-Q100 Grade 1 | Higher gain reduces required sense resistor value but limits full-scale current range vs. MAX4080FASA-T's 5V/V | Select when higher gain simplifies layout at expense of dynamic range; requires recalibration for same RSENSE |
| LT6106IMS8#TRPBF | 40V common-mode max, 50V/V gain, 65µA IQ, SO-8 package | Lower voltage rating excludes 48V telecom and 24V truck use; higher gain increases sensitivity to PCB leakage | Prefer for ≤40V industrial supplies where ultra-low IQ and high gain justify reduced voltage margin |
Compared with INA240A1QDRQ1 and LT6106IMS8#TRPBF, the MAX4080FASA-T uniquely balances 76V operation, 5V/V gain flexibility, and automotive-grade temperature range in a standard SO-8 footprint-making it optimal for 12V/24V/48V battery monitoring where full-scale headroom and low-offset accuracy are prioritized over ultra-high gain.
Availability
MAX4080FASA-T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom backplane monitoring, and industrial power supply overcurrent protection requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4080FASA-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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX4080/MAX4081 family was engineered specifically for high-voltage, high-accuracy current sensing in battery-powered and telecom infrastructure systems where ground-path integrity and wide common-mode range are non-negotiable.
FAQ
What is the maximum common-mode voltage the MAX4080FASA-T can handle?
The MAX4080FASA-T supports a common-mode input voltage range of 4.5V to 76V on both RS+ and VCC pins independently. This means it can accurately monitor current in 48V telecom systems or 24V truck batteries without external level-shifting circuitry. The device remains functional even when RS+ is at 76V while VCC is powered from a lower 5V rail, preserving design flexibility in multi-rail systems.
Does the MAX4080FASA-T require an external reference voltage?
No, the MAX4080FASA-T does not require an external reference voltage. As a unidirectional current-sense amplifier, it outputs a single-ended voltage (VOUT = VSENSE × 5) referenced to GND. Unlike the bidirectional MAX4081 series, it has no REF1A/REF1B pins and operates with only VCC, GND, RS+, RS−, and OUT connections-reducing component count and layout complexity.
What is the full-scale sense voltage range for the MAX4080FASA-T?
The MAX4080FASA-T has a full-scale sense voltage range of ±1000mV, corresponding to its 5V/V gain. At maximum positive VSENSE (1000mV), the output reaches 5.0V; at minimum (–1000mV), it reaches 0V. This range enables use of very low-value sense resistors (e.g., 0.5mΩ at 2000A) while maintaining sufficient signal-to-noise ratio for precision measurement.
How does the MAX4080FASA-T differ from the MAX4080FAUA+ variant?
The MAX4080FASA-T and MAX4080FAUA+ share identical electrical specifications, gain (5V/V), and temperature range (–40°C to +125°C), but differ in package: MAX4080FASA-T uses an 8-pin SO package, while MAX4080FAUA+ uses the smaller 8-pin µMAX® package. The SO variant offers easier manual prototyping, standard reflow compatibility, and broader distributor availability than the µMAX footprint.
Can the MAX4080FASA-T be used in bidirectional current sensing applications?
No, the MAX4080FASA-T is strictly unidirectional and cannot measure reverse (discharge) current. Its output voltage is always non-negative (0–5V) and proportional only to the magnitude of current flowing from RS+ to RS−. For bidirectional sensing-such as battery charge/discharge monitoring-the MAX4081FASA+ (same package, 5V/V gain, REF1A/REF1B pins) must be used instead.
MAX4080FASA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SOIC
MAX4080FASA-T FAQ
1.How can I place an order for MAX4080FASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4080FASA-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 MAX4080FASA-T reliable?
The price and inventory of MAX4080FASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4080FASA-T is usually 5 days.
3.What payment methods are accepted for MAX4080FASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4080FASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4080FASA-T?
MAX4080FASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4080FASA-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 MAX4080FASA-T?
For technical support, including MAX4080FASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4080FASA-T requirements.
6.How does Aetrix verify that MAX4080FASA-T is sourced from the original manufacturer or authorized distributors?
All MAX4080FASA-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 MAX4080FASA-T meets industry standards.
7.What is the process for return or replacement of MAX4080FASA-T?
All MAX4080FASA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4080FASA-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 MAX4080FASA-T part is unused and in its original packaging.
Return procedure for MAX4080FASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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