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Analog Devices Inc./Maxim Integrated MAX4080FASA
- Part No.:
- MAX4080FASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4080FASA.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
MAX4080FASA 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 input offset voltage. It operates over –40°C to +125°C and delivers a voltage output proportional to sensed current across an external shunt resistor-ideal for automotive battery monitoring and telecom power management.
For engineers reviewing the MAX4080FASA datasheet, MAX4080FASA pinout, MAX4080FASA application, or MAX4080FASA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world application mappings for high-voltage unidirectional current sensing in production systems.
Technical Context
The MAX4080FASA 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) ensures stable 5V/V amplification of VSENSE = (RS+ − RS−).
No external reference is required-output voltage scales linearly from GND to VCC as VSENSE ranges from 0mV to +1000mV. The device draws only 75µA supply current and maintains ±1.2% gain error across its full automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 5V/V - fixed internal ratio; outputs 5× sense voltage (e.g., 100mV VSENSE → 500mV VOUT) |
| Common-Mode Input Range | 4.5V to 76V - supports direct connection to 12V/24V/48V/72V bus rails without level shifting |
| Full-Scale Sense Voltage | ±1000mV - maximum differential input before output saturation; unidirectional use limits to +1000mV |
| Input Offset Voltage | ±0.1mV (typ), ±1.2mV (max) - enables accurate low-current measurement down to ~1mA with 1Ω shunt |
| Supply Current | 75µA (typ) - ultra-low quiescent draw suitable for always-on battery-powered systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial power-conversion environments |
| Bandwidth | 250kHz - supports fast transient current detection in motor control and DC-DC converter feedback loops |
Pinout & Package
MAX4080FASA is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant and rated for surface-mount reflow up to +260°C. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input | Connects to positive terminal of external shunt; withstands up to +80V absolute max |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply; decouple to GND with ≥0.1µF ceramic capacitor |
| 3, 6, 7 N.C. | No internal connection | Leads are electrically floating; may be left open or tied to GND for mechanical stability |
| 4 GND | Analog ground reference | Return path for output stage and internal bias; must be connected to system ground plane |
| 5 OUT | Voltage output | Single-ended analog output proportional to VSENSE × 5; rail-to-rail swing limited by VCC and load |
| 8 RS− | Low-side sense input | Connects to negative terminal of shunt; common-mode voltage referenced to GND |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional high-side sensing | Eliminates ground-loop errors and preserves load grounding integrity in battery-fed systems |
| 76V independent common-mode range | Enables direct monitoring of 48V telecom backplanes or 72V EV auxiliary supplies without isolation |
| ±0.1% full-scale gain accuracy | Reduces calibration burden in production test; supports <0.5% total current-measurement error with proper shunt selection |
| 8-pin SO footprint | Standard JEDEC MS-012AC outline; compatible with automated SMT assembly and IPC-7351B land patterns |
| Automotive temperature qualification | Validated for AEC-Q100 stress testing; supports deployment in engine control modules and ADAS power domains |
Applications
| Automotive Battery Monitoring | 48V Telecom Power Distribution |
|---|---|
Use Scenario: Real-time monitoring of 12V/24V starter battery discharge during cold cranking and alternator charging recovery. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting shunt voltage into scalable analog output for MCU ADC sampling. Use Value: Enables precise state-of-charge estimation and load shedding decisions without compromising chassis ground integrity. | Use Scenario: Measuring load current on 48V DC distribution boards in central office switching equipment and base station power shelves. IC Role / Device Role / Timing Role: Unidirectional current monitor interfacing with isolated ADC or digital power controller via analog voltage output. Use Value: Provides sub-1% current accuracy across wide input voltage swings (40V–57V), supporting dynamic load balancing and fault reporting. |
| Precision DC-DC Converter Feedback | Industrial Motor Drive Current Sensing |
Use Scenario: Closed-loop current regulation in high-efficiency buck converters delivering 3.3V/5V/12V from 24V or 48V input rails. IC Role / Device Role / Timing Role: High-bandwidth (250kHz) analog current sensor feeding error amplifier or digital PWM controller. Use Value: Enables fast transient response (<20µs settling) and stable regulation under step-load conditions up to 20A. | Use Scenario: Phase-current sensing in three-phase BLDC motor drives where high-side sensing avoids current-sense resistor placement in low-side return paths. IC Role / Device Role / Timing Role: Unidirectional current amplifier providing isolated analog feedback to gate driver IC or MCU. Use Value: Maintains signal fidelity at 100kHz PWM frequencies while rejecting common-mode noise from switching nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V fixed gain, 80V common-mode, ±20ppm/°C offset drift vs. ±1.2mV max for MAX4080FASA | Requires external gain scaling for same full-scale output; better drift performance but higher quiescent current (1.8mA) | Select when long-term thermal stability outweighs low-power requirements |
| ACS724LMATR-10AU-T | Integrated Hall-effect sensor, 10A range, ratiometric output, no external shunt needed | Lower bandwidth (40kHz), lower accuracy (±1.5%), and larger SOICW package vs. SO-8 | Select when board space allows larger footprint and galvanic isolation is mandatory |
Compared with INA240A1QDRQ1 and ACS724LMATR-10AU-T, the MAX4080FASA offers the lowest quiescent current (75µA), tightest initial gain accuracy (±0.1%), and smallest SO-8 footprint-making it optimal for space-constrained, always-on automotive and telecom current-monitoring nodes.
Availability
MAX4080FASA is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, and industrial DC-DC converter feedback requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4080FASA 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 unidirectional and bidirectional current sensing in battery-powered and telecom infrastructure systems-prioritizing wide common-mode range, low offset, and minimal PCB footprint.
FAQ
What is the maximum common-mode voltage the MAX4080FASA can handle?
The MAX4080FASA supports a common-mode input range of 4.5V to 76V on both RS+ and VCC pins independently. Absolute maximum ratings allow RS+ and RS− to withstand –0.3V to +80V relative to GND. This enables direct connection to 48V telecom buses or 72V EV auxiliary supplies without external attenuation or isolation.
Does the MAX4080FASA require an external reference voltage?
No, the MAX4080FASA does not require an external reference voltage. As a unidirectional amplifier, it outputs a single-ended voltage referenced to GND: VOUT = 5 × (RS+ − RS−). Only the bidirectional MAX4081 variants need REF1A/REF1B connections to set the zero-current output level.
What shunt resistor value should I use with the MAX4080FASA for a 10A full-scale measurement?
For 10A full-scale current and 5V/V gain, select RSENSE so that VSENSE = 1000mV at full scale: RSENSE = 1000mV / 10A = 100mΩ. Confirm power dissipation: P = I²R = 10² × 0.1 = 10W - use a 10W, low-inductance, Kelvin-connected metal-foil shunt with ±0.1% tolerance for best accuracy.
Can the MAX4080FASA be used in bidirectional current-sensing applications?
No, the MAX4080FASA is strictly unidirectional. It outputs only positive voltages proportional to forward current flow (RS+ > RS−). For bidirectional sensing-including charge/discharge monitoring in smart batteries-use the MAX4081FASA, which features dual reference inputs (REF1A/REF1B) and symmetric output swing around VREF.
Is the MAX4080FASA pin-compatible with other gain versions in the same package?
Yes, all MAX4080 variants (F/T/S suffixes) in the 8-pin SO package-including MAX4080FASA, MAX4080TASA, and MAX4080SASA-are pin-compatible. They share identical pinout, footprint, and electrical interface; only internal gain (5V/V, 20V/V, or 60V/V) and full-scale VSENSE range differ. No PCB redesign is needed when upgrading gain.
MAX4080FASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MAX4080FASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4080FASA 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 reliable?
The price and inventory of MAX4080FASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4080FASA is usually 5 days.
3.What payment methods are accepted for MAX4080FASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4080FASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4080FASA?
MAX4080FASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4080FASA 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?
For technical support, including MAX4080FASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4080FASA requirements.
6.How does Aetrix verify that MAX4080FASA is sourced from the original manufacturer or authorized distributors?
All MAX4080FASA 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 meets industry standards.
7.What is the process for return or replacement of MAX4080FASA?
All MAX4080FASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4080FASA, 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 part is unused and in its original packaging.
Return procedure for MAX4080FASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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