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Analog Devices Inc./Maxim Integrated MAX4377FEUA
- Part No.:
- MAX4377FEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377FEUA.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,913
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Product details
Overview
MAX4377FEUA from Maxim Integrated is a single-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 2MHz bandwidth - designed for precision battery-charger current monitoring in automotive and portable systems.
For engineers reviewing the MAX4377FEUA datasheet, MAX4377FEUA pinout, MAX4377FEUA application, or MAX4377FEUA equivalent, this device delivers buffered voltage output (2mA drive), 1mA typical supply current, -40°C to +125°C operation, and internal gain eliminating external resistors - critical for space-constrained, high-reliability current sensing where ground-path integrity must be preserved.
Technical Context
The MAX4377FEUA implements a BiCMOS-based current-mirror architecture that converts differential sense voltage (VRS+ – VRS−) into a proportional buffered output voltage without requiring external gain-setting components. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling accurate sensing during deep battery discharge.
It features a 2MHz small-signal bandwidth at +50V/V gain, 10V/µs slew rate, and <1µs saturation recovery - supporting dynamic current control loops in switching regulators and battery chargers. The buffered output maintains stability driving up to 2mA into ground-referenced loads with ≤5Ω output resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct interface to ADCs without external resistor networks. |
| Common-Mode Input Range | 0V to +28V - supports sensing across fully discharged batteries and high-voltage rails independent of VCC. |
| Full-Scale Sense Voltage | 100mV - defines maximum differential input before output saturation; sets minimum RSENSE for target current range. |
| Supply Voltage Range | +3V to +28V - allows operation directly from battery or system rail without LDO pre-regulation. |
| Total Output Voltage Error | ±0.5% (typ) at +25°C - ensures high-accuracy current measurement without calibration in production systems. |
| Bandwidth | 2MHz - sufficient for closed-loop response in fast-switching battery chargers and DC-DC converters. |
| Supply Current | 1mA (typ) per amplifier - enables low-power always-on monitoring in battery-backed applications. |
Pinout & Package
MAX4377FEUA is housed in an 8-pin µMAX® package (package code U8+1, outline 21-0036), RoHS-compliant, with 0.05" pitch and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Buffered voltage output proportional to sensed current; drives up to 2mA into ground-referenced load. |
| 2 | GND | Analog ground reference for internal circuitry and output stage; must be connected to system AGND. |
| 3 | VCC | Positive supply input (+3V to +28V); powers internal amplifier and current mirror. |
| 4 | RS+ | High-side connection to external sense resistor; accepts common-mode voltages up to +28V. |
| 5 | RS− | Load-side connection to external sense resistor; completes differential sense path. |
| 6–8 | N.C. | No internal connection; left unconnected on PCB; no routing or pull-up/pull-down required. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates gain-setting resistors, reducing BOM count and layout sensitivity to parasitic capacitance. |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery deep-discharge (<1V) without signal loss or offset shift. |
| ±0.5% full-scale accuracy (25°C) | Reduces need for system-level calibration in automotive fuel gauges and smart battery packs. |
| 2MHz bandwidth at +50V/V | Supports real-time current feedback in 500kHz+ switching charger topologies with minimal phase lag. |
| Buffered 2mA output drive | Directly interfaces to SAR or delta-sigma ADC inputs without external op-amp buffering stages. |
Applications
| Battery Charger Current Monitoring | Automotive Smart Battery Management |
|---|---|
|
Use Scenario: Real-time current measurement in constant-current/constant-voltage (CC/CV) lithium-ion battery chargers with wide input voltage range. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-independent feedback to charger controller PWM logic. Use Value: Enables precise charge termination and safety cutoff without disrupting battery ground return path or introducing measurement error from ground bounce. |
Use Scenario: Bidirectional current tracking in 12V vehicle start-stop systems with regenerative braking and auxiliary load management. IC Role / Device Role / Timing Role: Single-channel current sensor feeding CAN bus microcontroller for state-of-charge (SoC) and health (SoH) estimation. Use Value: Maintains accuracy over -40°C to +125°C ambient while rejecting common-mode noise from alternator ripple and ignition transients. |
| Portable Device Fuel Gauging | Industrial Power Supply Current Limiting |
|
Use Scenario: Accurate current integration in notebook computers and tablets to estimate remaining runtime and battery capacity fade. IC Role / Device Role / Timing Role: High-precision analog front-end converting mΩ-sense resistor voltage to stable DC output for ADC sampling. Use Value: Delivers ±0.5% full-scale error at room temperature and <±3.25% over full automotive range - meeting JEITA battery gauge accuracy requirements. |
Use Scenario: Overcurrent protection and dynamic load regulation in programmable bench power supplies and server VRMs. IC Role / Device Role / Timing Role: Fast-response current monitor feeding comparator or digital controller for sub-µs fault shutdown. Use Value: 1µs saturation recovery and 2MHz bandwidth allow detection of transient overloads before MOSFET thermal runaway occurs. |
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 | +20V/V fixed gain; 80dB CMR; 4.5V to 80V supply; AEC-Q100 Grade 1 | Higher voltage rating suits 48V EV subsystems; lower gain requires larger RSENSE for same output swing | Select when >28V common-mode or AEC-Q100 qualification is mandatory; not drop-in due to different gain and pinout. |
| MAX4080TASA+ | +20V/V gain; 1.5MHz bandwidth; 0.5µA quiescent current; SO-8 package | Ultra-low power ideal for always-on battery monitoring; reduced bandwidth limits use in fast charger loops | Choose for energy-constrained IoT nodes where 1mA vs. 0.5µA supply current impacts battery life more than loop speed. |
Compared with MAX4377FEUA, INA240A1QDRQ1 supports higher voltage rails but lacks its 2MHz bandwidth and +50V/V gain flexibility, while MAX4080TASA+ trades performance for ultra-low power - making MAX4377FEUA optimal for automotive-grade, medium-speed, high-accuracy current sensing where gain and bandwidth are prioritized.
Availability
MAX4377FEUA is available at Aetrix Electronics and suitable for battery charger current monitoring, automotive smart battery management, and industrial power supply current limiting requiring stable component supply, long-term lifecycle support, and automotive-grade temperature compliance.
Supply support for MAX4377FEUA 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-common-mode, high-side current sensing in battery-powered and automotive systems - prioritizing ground-path integrity, wide temperature operation, and integrated gain.
FAQ
What is the common-mode input voltage range of the MAX4377FEUA?
The MAX4377FEUA supports a common-mode input voltage range of 0V to +28V, independent of supply voltage. This allows it to accurately sense current even when the battery voltage drops below 1V during deep discharge, and it remains functional when VRS+ exceeds VCC. The device maintains specified accuracy down to 2V common-mode; operation below 2V is functional but with reduced accuracy.
Does the MAX4377FEUA require external gain-setting resistors?
No, the MAX4377FEUA does not require external gain-setting resistors. It integrates a fixed +50V/V gain amplifier, delivering a buffered output voltage directly proportional to the sense resistor voltage drop. This eliminates resistor matching errors, layout sensitivity, and board space typically needed for discrete gain networks - simplifying design and improving long-term stability.
What is the maximum capacitive load the MAX4377FEUA output can drive?
The MAX4377FEUA output is stable with capacitive loads up to 1000pF, as verified by no sustained oscillation in testing. For optimal transient response and settling time, a load capacitance ≤15pF is recommended when using the full 2MHz bandwidth. Larger capacitive loads reduce bandwidth and increase output settling time but do not cause instability within the 1000pF limit.
Can the MAX4377FEUA be used in bidirectional current sensing applications?
The MAX4377FEUA is a unidirectional high-side current-sense amplifier and cannot measure reverse current flow. For bidirectional sensing, Maxim recommends the dual-channel MAX4377 (e.g., MAX4377FAUA+) configured with separate sense paths, or dedicated bidirectional amplifiers like the MAX40010. Using MAX4377FEUA in reverse-polarity conditions may result in output saturation or undefined behavior.
What is the supply current consumption of the MAX4377FEUA at 12V supply?
The MAX4377FEUA draws 1mA typical supply current at VCC = 12V, with a maximum of 2.2mA over temperature and process variation. This low quiescent current enables continuous current monitoring in battery-powered systems without significant impact on standby runtime - especially valuable in automotive always-on modules and portable fuel gauges.
MAX4377FEUA 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:
- 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-µMAX
MAX4377FEUA FAQ
1.How can I place an order for MAX4377FEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FEUA 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 MAX4377FEUA reliable?
The price and inventory of MAX4377FEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FEUA is usually 5 days.
3.What payment methods are accepted for MAX4377FEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FEUA?
MAX4377FEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FEUA 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 MAX4377FEUA?
For technical support, including MAX4377FEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FEUA requirements.
6.How does Aetrix verify that MAX4377FEUA is sourced from the original manufacturer or authorized distributors?
All MAX4377FEUA 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 MAX4377FEUA meets industry standards.
7.What is the process for return or replacement of MAX4377FEUA?
All MAX4377FEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FEUA, 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 MAX4377FEUA part is unused and in its original packaging.
Return procedure for MAX4377FEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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