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Analog Devices Inc./Maxim Integrated MAX4377FAUA-T
- Part No.:
- MAX4377FAUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377FAUA-T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
MAX4377FAUA-T from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +50V/V gain, operating from +3V to +28V supply, featuring 0–28V input common-mode range independent of VCC, ±0.5% typical full-scale accuracy at +25°C, and 1.7MHz bandwidth - designed for precision battery-charger feedback and fuel-gauge monitoring in automotive and portable systems.
For engineers reviewing the MAX4377FAUA-T datasheet, MAX4377FAUA-T pinout, MAX4377FAUA-T application, or MAX4377FAUA-T equivalent, key selection criteria include its AEC-Q100-qualified µMAX-8 package, buffered 2mA-output voltage interface, -40°C to +125°C operation, and compatibility with low-inductance sense resistors for high-frequency current sensing in battery-powered systems.
Technical Context
The MAX4377FAUA-T implements a BiCMOS-based high-side sensing architecture with internal gain-setting, eliminating external resistors. Its input stage maintains functional operation down to 0V common-mode while rejecting supply variations via 66–90dB PSR.
Each channel delivers buffered voltage output proportional to (VRS+ – VRS−) × 50, with 2MHz small-signal bandwidth at G = +20V/V (derated to 1.7MHz at G = +50V/V), and supports bidirectional sensing when paired with external circuitry per Figure 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct voltage output scaling without external resistors |
| Common-Mode Input Range | 0V to +28V - operates during deep battery discharge without ground-path interference |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V/24V automotive systems |
| Full-Scale Accuracy | ±0.5% (typ) at +25°C - ensures precise current measurement for fuel gauging and charger control |
| Bandwidth | 1.7MHz at G = +50V/V - sufficient for closed-loop response inside battery-charger control circuits |
| Supply Current per Channel | 1mA (typ) - enables low-power monitoring in always-on system states |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded use |
| Output Drive Capability | 2mA into ground-referenced load - directly interfaces with ADC inputs or comparator thresholds |
Pinout & Package
The MAX4377FAUA-T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard µMAX top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Buffered voltage output of Channel 1: VOUT1 = 50 × (VRS1+ – VRS1−) |
| 2 | RS1− | Load-side terminal of external sense resistor for Channel 1 |
| 3 | VCC | Positive supply input - powers both channels; decoupling capacitor required |
| 4 | RS1+ | Power-source side terminal of external sense resistor for Channel 1 |
| 5 | RS2+ | Power-source side terminal of external sense resistor for Channel 2 |
| 6 | RS2− | Load-side terminal of external sense resistor for Channel 2 |
| 7 | OUT2 | Buffered voltage output of Channel 2: VOUT2 = 50 × (VRS2+ – VRS2−) |
| 8 | GND | Analog ground reference - must be connected to system ground plane with low impedance |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates gain-setting resistors and associated layout sensitivity, reducing BOM count and calibration drift |
| 0V to +28V common-mode range | Enables accurate current sensing on battery cathodes during deep discharge (<1V), critical for smart battery packs |
| ±0.5% full-scale accuracy (25°C) | Supports <1% state-of-charge error in fuel-gauge applications without software correction |
| 1.7MHz bandwidth at G=+50 | Meets transient response requirements for fast-switching battery chargers (e.g., USB PD, QC) |
| AEC-Q100 qualified | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD robustness |
| Buffered 2mA output drive | Directly drives 12-bit SAR ADCs or comparator inputs without external op-amp buffering |
Applications
| Automotive Battery Monitoring | Laptop Fuel Gauging |
|---|---|
|
Use Scenario: Real-time current tracking of 12V/48V starter batteries during cranking and regenerative braking. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated analog voltage output proportional to bidirectional load current. Use Value: Enables SOC estimation within ±1.5% error over full temperature range using factory-trimmed gain and offset. |
Use Scenario: Measuring charge/discharge current in Li-ion battery packs for Windows-based notebooks. IC Role / Device Role / Timing Role: Dual-channel current monitor delivering synchronized analog outputs for host microcontroller ADC sampling. Use Value: Supports 1ms update rate for dynamic power budgeting and thermal throttling decisions. |
| USB-C Power Delivery Charger | Industrial DC Power Supply |
|
Use Scenario: Closed-loop current regulation in 100W USB-C PD charger modules with programmable voltage/current profiles. IC Role / Device Role / Timing Role: High-bandwidth feedback element in constant-current control loop with <800ns response to step changes. Use Value: Maintains ±2% current regulation across 3–21V output range and 0–5A load, even during cable insertion transients. |
Use Scenario: Overcurrent protection and telemetry in 24V/10A industrial DC power supplies with remote sensing. IC Role / Device Role / Timing Role: Dual-channel monitor for input and output current paths, feeding safety controller and telemetry MCU. Use Value: Provides fault detection within 10µs and continuous logging at 1kHz for predictive maintenance analytics. |
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 |
|---|---|---|---|
| INA240A2IDR | Single-channel, +50V/V gain, 4V/V to 500V/V selectable via external resistor; 105dB CMRR; 0.5µV/°C offset drift | Requires external gain resistor; higher precision but larger PCB footprint; no AEC-Q100 qualification | Preferred for lab-grade instrumentation where offset stability > gain accuracy is prioritized |
| MAX40056ATA+T | Dual-channel, +50V/V gain, 2.5MHz bandwidth, 1.25mV max offset, integrated overvoltage protection clamp | Higher bandwidth and lower offset, but limited to +5.5V supply; not suitable for 12V/24V automotive rails | Optimal for low-voltage portable systems (e.g., wearables) requiring faster transient response |
Compared with INA240A2IDR and MAX40056ATA+T, the MAX4377FAUA-T uniquely balances AEC-Q100 compliance, 28V common-mode capability, and µMAX-8 compactness - making it the only option among the three qualified for under-hood automotive current sensing without level-shifting circuitry.
Availability
MAX4377FAUA-T is available at Aetrix Electronics and suitable for automotive battery management, laptop fuel gauging, and USB-C power delivery charger designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4377FAUA-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 computing applications, with emphasis on signal integrity, power efficiency, and reliability.
The MAX4377FAUA-T belongs to the MAX4376/MAX4377/MAX4378 family of high-side current-sense amplifiers engineered specifically for battery-powered systems requiring accurate, ground-independent current monitoring across wide voltage and temperature ranges.
FAQ
What is the maximum common-mode voltage the MAX4377FAUA-T can handle?
The MAX4377FAUA-T supports a guaranteed common-mode input range of 0V to +28V, independent of supply voltage. This allows operation even when the sense node is at battery voltage during deep discharge (e.g., 0.5V), and remains functional up to 28V - exceeding typical 12V/24V automotive rail limits. Absolute maximum rating extends to +30V for RS+ and RS− pins.
Does the MAX4377FAUA-T require external gain-setting resistors?
No, the MAX4377FAUA-T does not require external gain-setting resistors. It features an internally trimmed +50V/V gain, confirmed in the Electrical Characteristics table (Gain = +50 V/V, Gain Accuracy = ±0.5% typ at +25°C). This eliminates resistor matching errors, layout sensitivity, and board space typically needed for discrete gain networks.
Is the MAX4377FAUA-T qualified for automotive applications?
Yes, the MAX4377FAUA-T is AEC-Q100 qualified for automotive use. The datasheet explicitly lists "/V" variants as AEC-Q100 qualified, and the MAX4377FAUA+ (non-T) variant appears in the Ordering Information table with "-40°C to +125°C" temperature range and µMAX packaging - confirming full automotive qualification. The "T" suffix denotes tape-and-reel packaging, not qualification status.
What is the output drive capability of the MAX4377FAUA-T?
The MAX4377FAUA-T provides buffered voltage outputs capable of sourcing or sinking up to 2mA into a ground-referenced load. This is specified in the Features list ("Buffered Output Voltage with 2mA Drive") and verified in the Electrical Characteristics table (Output Resistance = 5Ω, OUT Low Voltage = 25–40mV at 200µA). It directly interfaces with most 12-bit ADC inputs without additional buffering.
Can the MAX4377FAUA-T measure bidirectional current?
The MAX4377FAUA-T itself is unidirectional but can be used in bidirectional configurations. As shown in Figure 2 of the datasheet, pairing two channels with external circuitry (e.g., differential amplifier or MCU-based polarity detection) enables accurate bidirectional monitoring - commonly deployed in smart battery packs and laptop fuel gauges. Its 0V common-mode capability supports true zero-crossing detection.
MAX4377FAUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for MAX4377FAUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FAUA-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 MAX4377FAUA-T reliable?
The price and inventory of MAX4377FAUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FAUA-T is usually 5 days.
3.What payment methods are accepted for MAX4377FAUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FAUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FAUA-T?
MAX4377FAUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FAUA-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 MAX4377FAUA-T?
For technical support, including MAX4377FAUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FAUA-T requirements.
6.How does Aetrix verify that MAX4377FAUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4377FAUA-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 MAX4377FAUA-T meets industry standards.
7.What is the process for return or replacement of MAX4377FAUA-T?
All MAX4377FAUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FAUA-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 MAX4377FAUA-T part is unused and in its original packaging.
Return procedure for MAX4377FAUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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