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Analog Devices Inc./Maxim Integrated MAX4377FAUA+
- Part No.:
- MAX4377FAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377FAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
MAX4377FAUA+ from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +50V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and 1.7MHz bandwidth. It operates from +3V to +28V supply, draws 1mA per channel, and supports automotive temperature range (−40°C to +125°C), enabling precise battery-current monitoring in notebook computers and smart battery packs.
For engineers reviewing the MAX4377FAUA+ datasheet, MAX4377FAUA+ pinout, MAX4377FAUA+ application, or MAX4377FAUA+ equivalent, key selection criteria include gain-matched dual-channel operation, buffered 2mA-output voltage interface, AEC-Q100-qualified reliability, and µMAX-8 package compatibility with space-constrained power management layouts.
Technical Context
The MAX4377FAUA+ implements a precision high-side sensing architecture using internal current-mirror gain stages and rail-to-rail output buffering. Its input common-mode range extends down to 0V-critical for deep-discharge battery monitoring-and remains fully functional even when VRS+ exceeds VCC.
Each channel delivers a buffered voltage output proportional to (RSENSE × ILOAD) × 50, eliminating external gain-setting resistors. The device features 90dB CMR at 2–28V common-mode, 66–90dB PSR across 3–28V supply, and 1µs saturation recovery time-enabling stable integration into fast battery-charger control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct voltage output scaling without external resistors |
| Input Common-Mode Range | 0V to +28V - supports battery monitoring down to 0V regardless of supply voltage |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before output saturation |
| Total Output Voltage Error | ±0.5% (typ) at +25°C - ensures high-accuracy current measurement without calibration |
| Bandwidth | 1.7MHz - sufficient for real-time response inside battery-charger feedback loops |
| Supply Current per Channel | 1mA (typ) - low quiescent draw preserves battery life in portable systems |
| Operating Temperature | −40°C to +125°C - meets automotive-grade thermal requirements |
Pinout & Package
MAX4377FAUA+ is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), RoHS-compliant, with exposed pad for thermal enhancement. Pin pitch is 0.65mm; body size is 3mm × 3mm × 0.8mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT, OUT_ | Buffered voltage output proportional to sensed current; drives up to 2mA into ground-referenced load |
| 2, 6 | RS−, RS_− | Load-side connection to external sense resistor; referenced to system ground path |
| 3, 5 | RS+, RS_+ | Power-side connection to external sense resistor; accepts 0–28V common-mode voltage |
| 4 | GND | Analog ground reference for internal circuitry and output stage |
| 8 | VCC | Positive supply input (+3V to +28V); powers both channels and output buffer |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates gain-setting resistors and layout sensitivity, reducing BOM count and PCB area |
| 0V to +28V common-mode range | Enables accurate current sensing during battery deep discharge without signal loss |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering |
| AEC-Q100 qualified | Validated for automotive applications including battery management and PA bias control |
| 1.7MHz bandwidth | Supports dynamic current monitoring in switching regulator control loops with <800ns settling |
Applications
| Smart Battery Fuel Gauge | Notebook Computer Power Monitoring |
|---|---|
|
Use Scenario: Real-time bidirectional battery current tracking in laptop systems with integrated charging ICs. IC Role / Device Role / Timing Role: Dual-channel high-side current sensor providing separate charge/discharge current outputs to fuel-gauge microcontroller. Use Value: Enables ±0.5% full-scale accuracy over −40°C to +125°C, supporting precise state-of-charge estimation without calibration drift. |
Use Scenario: System-level board current monitoring for thermal throttling and power budget enforcement. IC Role / Device Role / Timing Role: Dual-channel current monitor measuring CPU VRM and peripheral bus currents simultaneously. Use Value: 1.7MHz bandwidth and 1µs saturation recovery allow detection of transient overcurrent events before damage occurs. |
| Automotive Battery Disconnect Monitoring | Industrial Current-Limited Power Supply |
|
Use Scenario: Detecting open-circuit faults and leakage currents in 12V/24V vehicle battery disconnect modules. IC Role / Device Role / Timing Role: High-side current sensor placed between battery terminal and main distribution fuse. Use Value: 0V common-mode capability ensures valid readings even when battery voltage drops below 1V during cranking or fault conditions. |
Use Scenario: Precision current limiting in programmable lab power supplies with digital setpoint control. IC Role / Device Role / Timing Role: Feedback element in analog current-control loop driving MOSFET pass transistor. Use Value: ±0.5% error at +25°C and 90dB CMR suppress noise from switching regulators, improving current regulation 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 |
|---|---|---|---|
| INA219AIDR | I²C digital output, 16-bit ADC, 0.1% gain error, but only 26V max common-mode | Requires microcontroller interface; lacks analog output for direct loop control | Select when digital telemetry and energy accumulation are prioritized over analog loop speed |
| MAX4080TASA+ | +20V/V gain, SO-8 package, same µMAX footprint-compatible pinout, 2MHz bandwidth | Lower gain reduces output voltage swing per mA sensed; identical thermal and reliability specs | Select when lower full-scale current ranges (e.g., <1A) require higher resolution at reduced output swing |
Compared with MAX4377FAUA+, INA219AIDR trades analog immediacy for digital flexibility and higher DC accuracy, while MAX4080TASA+ offers pin-compatible gain reduction for finer current resolution-both retain AEC-Q100 qualification and 0–28V common-mode capability.
Availability
MAX4377FAUA+ is available at Aetrix Electronics and suitable for notebook computers, automotive battery monitoring, and industrial current-limited power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4377FAUA+ 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 computing applications.
The MAX4377 series belongs to Maxim's high-accuracy current-sense amplifier product line, engineered specifically for high-side sensing in battery-powered and automotive systems where ground-path integrity and wide common-mode range are critical.
FAQ
What is the maximum common-mode voltage supported by MAX4377FAUA+?
MAX4377FAUA+ supports a common-mode input range of 0V to +28V, independent of supply voltage. This allows it to monitor current from deeply discharged batteries-even below 1V-while maintaining full accuracy and functionality. The specification is guaranteed across the full −40°C to +125°C operating temperature range.
Does MAX4377FAUA+ require external gain-setting resistors?
No, MAX4377FAUA+ does not require external gain-setting resistors. It integrates a fixed +50V/V gain stage optimized for precision high-side sensing. This eliminates resistor matching errors, layout sensitivity, and board space typically needed for discrete gain networks-reducing design complexity and improving long-term stability.
Is MAX4377FAUA+ qualified for automotive applications?
Yes, MAX4377FAUA+ is AEC-Q100 qualified and rated for the full automotive temperature range (−40°C to +125°C). Its BiCMOS process, robust ESD protection, and validated reliability data make it suitable for battery management, PA bias control, and other safety-critical automotive subsystems.
What is the output drive capability of MAX4377FAUA+?
MAX4377FAUA+ provides a buffered voltage output capable of sourcing or sinking up to 2mA into a ground-referenced load. This allows direct interfacing with standard SAR or delta-sigma ADC inputs, comparators, or microcontroller analog inputs without additional buffering stages-simplifying signal chain design.
Can MAX4377FAUA+ be used for bidirectional current sensing?
MAX4377FAUA+ is unidirectional by design-it outputs a positive voltage proportional to current flow from RS+ to RS−. For true bidirectional sensing (e.g., charge/discharge), two devices can be configured in complementary topology, or a dedicated bidirectional amplifier like MAX4377HAUA+ (with phase-reversal handling) should be selected per application requirements.
MAX4377FAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4377FAUA+ FAQ
1.How can I place an order for MAX4377FAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FAUA+ 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 MAX4377FAUA+ reliable?
The price and inventory of MAX4377FAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FAUA+ is usually 5 days.
3.What payment methods are accepted for MAX4377FAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FAUA+?
MAX4377FAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FAUA+ 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 MAX4377FAUA+?
For technical support, including MAX4377FAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FAUA+ requirements.
6.How does Aetrix verify that MAX4377FAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4377FAUA+ 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 MAX4377FAUA+ meets industry standards.
7.What is the process for return or replacement of MAX4377FAUA+?
All MAX4377FAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FAUA+, 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 MAX4377FAUA+ part is unused and in its original packaging.
Return procedure for MAX4377FAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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