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Analog Devices Inc./Maxim Integrated MAX4080SAUA
- Part No.:
- MAX4080SAUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4080SAUA.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:782
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Product details
Overview
MAX4080SAUA from Maxim Integrated is a unidirectional, high-side current-sense amplifier with 60V/V gain, 4.5V–76V common-mode input range, ±100mV full-scale sense voltage, and ±1.2% gain accuracy over –40°C to +125°C - designed for precision high-voltage battery monitoring in automotive and telecom power systems.
For engineers reviewing the MAX4080SAUA datasheet, MAX4080SAUA pinout, MAX4080SAUA application, or MAX4080SAUA equivalent, this device delivers rail-to-rail output swing capability, 75µA quiescent current, 100µV max input offset, 100dB CMRR, and µMAX-8 package compatibility for space-constrained high-side sensing where ground-path integrity is critical.
Technical Context
The MAX4080SAUA implements a bipolar-based current-mirror architecture that amplifies the differential voltage across an external sense resistor (RS+ to RS–) without loading the monitored path. Its 60V/V fixed gain is achieved via internal 20kΩ feedback resistors, enabling accurate measurement of low sense voltages down to ±100mV full-scale.
Unlike bidirectional variants, the MAX4080SAUA outputs a single-ended voltage proportional to VSENSE only (no REF1A/REF1B inputs), with output swing referenced to GND and bounded by VCC and GND - making it suitable for unidirectional load-current monitoring where polarity reversal is not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V - sets full-scale output to 6.0V for ±100mV input; enables high-resolution sensing with low-loss shunt resistors |
| Common-Mode Input Range | 4.5V to 76V - supports direct high-side sensing on 12V/24V/48V/72V rails without level-shifting or isolation |
| Input Offset Voltage | ±1.2mV max (–40°C to +125°C) - contributes ≤1.2% error at full-scale 100mV sense voltage |
| Supply Current | 75µA typical - allows always-on current monitoring in battery-powered systems with minimal drain |
| CMRR | 100dB min - rejects common-mode noise from high-voltage bus transients during motor switching or load dumps |
| Bandwidth | 250kHz - supports real-time monitoring of fast-changing currents up to ~40kHz fundamental with <1% settling |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial backplane environments |
Pinout & Package
MAX4080SAUA is housed in an 8-pin µMAX® package (pin-compatible with SO-8 but 30% smaller footprint). The package features exposed pad for thermal enhancement and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input | Connects to positive terminal of external current-sense resistor; withstands up to +80V absolute max |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply; decoupling capacitor required between VCC and 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 output stage and internal biasing; must be connected to system ground plane |
| 5 OUT | Voltage output | Single-ended output proportional to VSENSE × 60; swings from near-GND to within 0.27V of VCC |
| 8 RS– | Low-side sense input | Connects to load side of sense resistor; common-mode voltage tracks RS+ within ±80V differential limit |
Key Features
| Feature | Design Value |
|---|---|
| 60V/V fixed gain | Enables ±100mV full-scale sensing - reduces I²R loss and self-heating in shunt resistors while maintaining 6V output headroom |
| 75µA supply current | Supports continuous current monitoring in energy-sensitive applications such as smart-battery fuel gauging and standby power supervision |
| ±1.2mV input offset (max) | Limits zero-current error to ≤1.2% of full-scale reading - critical for accurate battery charge/discharge accounting in unidirectional systems |
| 100dB CMRR | Rejects high-frequency noise from adjacent switching regulators or motor drivers without requiring additional filtering |
| µMAX-8 package | 2.8mm × 4.9mm footprint with 0.65mm pitch - saves PCB area versus SO-8 while maintaining thermal performance via exposed pad |
Applications
| Automotive Battery Monitoring | 48V Telecom Backplane Sensing |
|---|---|
Use Scenario: Real-time monitoring of starter battery discharge and alternator charging current in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring voltage drop across shunt resistor placed between battery positive and load. Use Value: Enables precise state-of-charge estimation and load diagnostics without disturbing ground-return paths or introducing measurement errors from shared return impedance. | Use Scenario: Continuous current monitoring on 48V DC distribution buses in telecom central offices and base stations. IC Role / Device Role / Timing Role: Unidirectional high-side amplifier converting millivolt-level shunt voltage into robust 0–6V analog output for ADC interfacing. Use Value: Provides immunity to bus transients up to 76V common-mode while delivering 250kHz bandwidth for detecting short-circuit events before fuse activation. |
| Precision Power-Supply Current Limiting | Industrial Motor Drive Phase Current Sensing |
Use Scenario: Closed-loop current limiting in programmable lab power supplies operating from 5V to 60V output rails. IC Role / Device Role / Timing Role: High-side sense amplifier feeding analog feedback signal to error amplifier controlling pass transistor gate drive. Use Value: Delivers ±1.2% gain accuracy and 100µV offset over temperature - ensuring tight current regulation across full output voltage and load range. | Use Scenario: Phase-leg current sensing in three-phase BLDC inverters used in HVAC compressors and industrial pumps. IC Role / Device Role / Timing Role: Unidirectional current monitor placed on high-side of each IGBT/MOSFET leg to detect overcurrent faults before device destruction. Use Value: 250kHz bandwidth and 20µs settling time enable detection of sub-cycle overcurrent events; 76V rating accommodates 48V bus with 30% transient margin. |
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 | 50V/V gain, 80V common-mode, 120µA IQ, SO-8 package | Higher supply current; wider common-mode but lower gain resolution for low-VSENSE applications | Select when higher common-mode margin (>76V) is needed and 50V/V gain suffices for target shunt voltage |
| MAX4080TAUA | 20V/V gain, same package/temp range, identical pinout | Lower gain requires larger sense voltage (±250mV) - increases I²R loss and shunt self-heating | Choose for applications needing higher full-scale sense voltage tolerance or reduced sensitivity to offset drift |
Compared with INA240A1QDRQ1 and MAX4080TAUA, the MAX4080SAUA provides highest gain (60V/V) in the family, minimizing required sense voltage and associated power loss - ideal for ultra-low-loss shunt designs where 100mV full-scale is acceptable and 75µA IQ is critical.
Availability
MAX4080SAUA is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned qualification.
Supply support for MAX4080SAUA 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 power, sensing, and interface applications in automotive, industrial, and communications markets.
The MAX4080 series targets high-voltage, high-accuracy current sensing - specifically engineered for unidirectional high-side monitoring where ground-path integrity, low quiescent current, and wide common-mode range are essential design constraints.
FAQ
What is the maximum common-mode voltage the MAX4080SAUA can handle?
The MAX4080SAUA supports a common-mode input voltage range of 4.5V to 76V, with absolute maximum ratings allowing RS+ and RS– pins to withstand up to +80V relative to GND. This enables direct integration into 48V telecom systems and 24V/12V automotive subsystems without external level-shifting circuitry. The MAX4080SAUA maintains specified performance across its full 4.5V–76V operating range.
Does the MAX4080SAUA require an external reference voltage?
No, the MAX4080SAUA does not require an external reference voltage. As a unidirectional variant, it outputs a single-ended voltage referenced to GND, unlike the bidirectional MAX4081 which uses REF1A/REF1B inputs. The MAX4080SAUA's OUT pin swings from near-GND to within 0.27V of VCC, eliminating need for external reference components or layout complexity associated with dual-reference routing.
What is the full-scale sense voltage range for the MAX4080SAUA?
The MAX4080SAUA has a full-scale sense voltage (VSENSE) range of ±100mV, corresponding to its 60V/V gain setting. At ±100mV input, the output delivers ±6.0V (referenced to GND), providing ample headroom for ADC interfacing. This low full-scale voltage minimizes I²R losses in the external sense resistor while maintaining high measurement resolution - a key advantage of the 'S' gain version in the MAX4080 family.
Can the MAX4080SAUA be used in bidirectional current sensing applications?
No, the MAX4080SAUA is strictly a unidirectional current-sense amplifier and cannot measure reverse current flow. It lacks the REF1A/REF1B reference inputs and internal level-shifting circuitry required for bidirectional operation. For bidirectional sensing, the pin-compatible MAX4081SAUA - which shares the same 60V/V gain, µMAX-8 package, and temperature range - must be used instead.
What package type and footprint does the MAX4080SAUA use?
The MAX4080SAUA is supplied in an 8-pin µMAX® package (package code U8+1), measuring 2.8mm × 4.9mm with 0.65mm lead pitch and an exposed thermal pad. It is pin-compatible with the SO-8 variant (MAX4080SASA) but occupies ~30% less PCB area. The µMAX package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant with lead-free terminations.
MAX4080SAUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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-µMAX
MAX4080SAUA FAQ
1.How can I place an order for MAX4080SAUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4080SAUA 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 MAX4080SAUA reliable?
The price and inventory of MAX4080SAUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4080SAUA is usually 5 days.
3.What payment methods are accepted for MAX4080SAUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4080SAUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4080SAUA?
MAX4080SAUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4080SAUA 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 MAX4080SAUA?
For technical support, including MAX4080SAUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4080SAUA requirements.
6.How does Aetrix verify that MAX4080SAUA is sourced from the original manufacturer or authorized distributors?
All MAX4080SAUA 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 MAX4080SAUA meets industry standards.
7.What is the process for return or replacement of MAX4080SAUA?
All MAX4080SAUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4080SAUA, 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 MAX4080SAUA part is unused and in its original packaging.
Return procedure for MAX4080SAUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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