My Inquiry
My Account
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:4,815
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX4377FAUA from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +50V/V gain, 0V to +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 targets battery-charger control loops and automotive current monitoring where ground-path integrity is critical.
For engineers reviewing the MAX4377FAUA datasheet, MAX4377FAUA pinout, MAX4377FAUA application, or MAX4377FAUA equivalent, key selection criteria include guaranteed operation across -40°C to +125°C, buffered 2mA-output voltage interface, internal gain eliminating external resistors, and compatibility with low-value sense resistors for high-current systems up to 10A.
Technical Context
The MAX4377FAUA implements a precision high-side sensing architecture using an internal current-mirror-based amplifier with fixed +50V/V gain. Its input common-mode range (0V to +28V) remains fully functional even when VRS+ falls below VCC - enabling deep-discharge battery monitoring without ground interference.
It delivers buffered voltage output with 2mA drive capability into ground-referenced loads, supports capacitive loads up to 1000pF, and achieves 1.7MHz small-signal bandwidth at gain = +50V/V. Power-supply rejection exceeds 66dB over 3V–28V supply variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain eliminates need for external gain-setting resistors |
| Common-Mode Input Range | 0V to +28V - enables direct connection to battery packs in deep discharge without ground disruption |
| Supply Voltage Range | +3V to +28V - supports wide-input industrial and automotive power rails |
| Bandwidth | 1.7MHz at +50V/V - sufficient for closed-loop response inside battery-charger control circuits |
| Full-Scale Accuracy | ±0.5% typical at +25°C - ensures precise current measurement for fuel gauging and overcurrent protection |
| Supply Current | 1mA per channel - enables low-power system-level current monitoring without significant overhead |
| Operating Temperature | -40°C to +125°C - AEC-Q100 qualified for under-hood automotive applications |
Pinout & Package
MAX4377FAUA is housed in an 8-pin µMAX® package (package code U8+1, outline 21-0036), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. The package is RoHS-compliant and rated for automotive temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced load |
| 2, 6 | RS1-, RS2- | Load-side terminals of external sense resistors - connect directly to load return path |
| 3, 5 | RS1+, RS2+ | Power-side terminals of external sense resistors - connect to battery or supply rail |
| 4 | GND | Analog ground reference for internal circuitry and output stage |
| 8 | VCC | Positive supply input - powers both channels; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates external gain-setting components and associated layout sensitivity or drift |
| 0V to +28V common-mode range | Enables accurate current sensing on battery terminals during deep discharge (<1V) without compromising ground integrity |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering |
| 1.7MHz bandwidth at +50V/V | Supports fast transient detection in battery-charger feedback paths and overcurrent shutdown circuits |
| AEC-Q100 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD robustness |
Applications
| Automotive Battery Monitoring | Fuel Gauging in Laptops |
|---|---|
Use Scenario: Real-time monitoring of charge/discharge current in 12V/24V vehicle battery systems with cold-cranking capability. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated analog voltage output proportional to bidirectional battery current. Use Value: Enables accurate state-of-charge estimation and overcurrent protection without disrupting chassis ground, meeting ISO 16750-2 pulse test requirements. | Use Scenario: Measuring charging/discharging current in ultrabook battery management subsystems with tight PCB space constraints. IC Role / Device Role / Timing Role: Dual-channel current sensor feeding two independent ADC channels for simultaneous source/sink current tracking. Use Value: Delivers ±0.5% full-scale accuracy at +25°C and maintains <±3.25% error across -40°C to +125°C - critical for fuel gauge algorithm convergence. |
| Battery Charger Control Loop | Industrial Power Supply Monitoring |
Use Scenario: Closed-loop current regulation in switch-mode battery chargers requiring sub-microsecond response to load transients. IC Role / Device Role / Timing Role: High-bandwidth (+50V/V, 1.7MHz) current feedback element placed inside charger PWM control loop. Use Value: 400ns setting time to 1% of final value ensures stable regulation during rapid current steps - preventing overshoot in Li-ion constant-current phase. | Use Scenario: Board-level current supervision in programmable logic controller (PLC) power modules with redundant 24V supplies. IC Role / Device Role / Timing Role: Dual-channel high-side monitor detecting overcurrent faults on primary and backup power rails independently. Use Value: Buffered 2mA outputs drive optocoupler inputs directly, enabling galvanically isolated fault signaling without additional level-shifting circuitry. |
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 |
|---|---|---|---|
| MAX4080TASA+ | +20V/V fixed gain; 2.5MHz bandwidth; SO-8 package; same -40°C to +125°C range | Lower gain requires larger sense resistor for same output swing - increases I²R loss in high-current applications | Select when higher bandwidth and lower gain tolerance (±0.1%) are prioritized over output voltage scaling |
| INA240A1D | +20V/V gain; 4MHz bandwidth; SO-8; ±20V common-mode; 2.5µV/°C offset drift | Wider common-mode (-5V to +80V) but lower accuracy (±0.5% max vs ±0.5% typ) and no AEC-Q100 qualification | Prefer for industrial systems needing extended voltage range and higher speed, where automotive qualification is not required |
Compared with MAX4377FAUA, MAX4080TASA+ offers higher bandwidth but lower gain - reducing output signal-to-noise ratio for low-current sensing; INA240A1D extends common-mode range significantly but trades off guaranteed automotive qualification and typical accuracy performance.
Availability
MAX4377FAUA is available at Aetrix Electronics and suitable for automotive battery monitoring, laptop fuel gauging, and battery-charger control loops requiring stable component supply across extended temperature ranges and long production lifecycles.
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 and mixed-signal ICs for industrial, automotive, and computing applications with emphasis on power efficiency and signal integrity.
The MAX4377FAUA belongs to the MAX4376/MAX4377/MAX4378 family of high-side current-sense amplifiers engineered specifically for battery-powered systems requiring ground-path isolation, wide common-mode operation, and automotive-grade reliability.
FAQ
What is the maximum common-mode voltage supported by the MAX4377FAUA?
The MAX4377FAUA supports a common-mode input voltage range of 0V to +28V, independent of supply voltage. This allows direct connection to battery terminals even during deep discharge conditions below 1V, while maintaining full functionality and accuracy - a key requirement for automotive and portable power systems where ground integrity must be preserved.
Does the MAX4377FAUA require external gain-setting resistors?
No, the MAX4377FAUA does not require external gain-setting resistors. It features an internal fixed +50V/V gain architecture, which simplifies PCB layout, eliminates resistor tolerance and drift errors, and improves long-term stability. This design choice makes MAX4377FAUA particularly suitable for space-constrained applications like notebook computers and compact battery chargers.
Can the MAX4377FAUA operate in automotive environments?
Yes, the MAX4377FAUA is AEC-Q100 qualified and specified to operate across -40°C to +125°C. Its electrical characteristics - including ±0.5% typical full-scale accuracy, 1.7MHz bandwidth, and 0V to +28V common-mode range - are guaranteed over this full automotive temperature range, making it suitable for under-hood battery monitoring, body control modules, and ADAS power subsystems.
What is the output drive capability of the MAX4377FAUA?
The MAX4377FAUA provides buffered voltage outputs capable of sourcing up to 2mA per channel into a ground-referenced load. This eliminates the need for external buffer amplifiers when interfacing with standard SAR or delta-sigma ADCs, microcontroller analog inputs, or comparator thresholds - reducing bill-of-materials cost and board area in current-monitoring subsystems.
How does the MAX4377FAUA handle bidirectional current sensing?
The MAX4377FAUA itself is unidirectional, but its dual-channel configuration enables implementation of bidirectional sensing when paired with appropriate external circuitry - such as two sense resistors in series with opposite polarity connections. Reference designs show MAX4377FAUA used in laptop fuel gauges where OUT1 monitors charge current and OUT2 monitors discharge current, leveraging its matched channel performance and temperature stability.
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:
- Obsolete
- 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.
MAX4377FAUA Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
