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Analog Devices Inc./Maxim Integrated MAX4377FASA+T
- Part No.:
- MAX4377FASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4377FASA+T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,618
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Product details
Overview
MAX4377FASA+T 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, 2mA buffered output drive, and operation from +3V to +28V supply across -40°C to +125°C - used for precision battery-charger current monitoring in automotive and portable systems.
For engineers reviewing the MAX4377FASA+T datasheet, MAX4377FASA+T pinout, MAX4377FASA+T application, or MAX4377FASA+T equivalent, key selection criteria include gain-matched dual-channel architecture, high common-mode rejection (90dB), low 1mA per-amplifier supply current, 1.7MHz bandwidth at G=+50, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4377FASA+T implements a dual high-side sensing topology using internal current-mirror-based amplification with fixed +50V/V gain per channel. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling accurate current measurement during deep battery discharge without ground-path interference.
Each channel features a buffered voltage output capable of sourcing/sinking up to 2mA into a ground-referenced load, with 1.7MHz small-signal bandwidth and 10V/µs slew rate. Power-supply rejection exceeds 66dB over +3V to +28V supply variation, ensuring stable output under noisy supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct VOUT = 50 × ILOAD × RSENSE calculation without external resistors |
| Common-Mode Input Range | 0V to +28V - supports monitoring battery packs at near-zero voltage without loss of functionality |
| Total Output Voltage Error | ±0.5% (typ) at +25°C - ensures <±10mV absolute error for 100mV full-scale sense voltage |
| Supply Current per Amplifier | 1mA (typ) - enables low-power operation in always-on battery-monitoring circuits |
| Bandwidth | 1.7MHz at G=+50 - sufficient for closed-loop control in fast-switching battery chargers |
| Output Drive Capability | 2mA into ground-referenced load - eliminates need for external buffer when interfacing to ADC inputs |
| Operating Temperature Range | -40°C to +125°C - qualified for under-hood automotive and industrial embedded applications |
Pinout & Package
MAX4377FASA+T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), measuring 3mm × 3mm × 0.8mm with exposed pad for thermal enhancement. The package is RoHS-compliant (+ suffix) and rated for automotive temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Dual buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced loads |
| 2, 6 | RS1–, RS2– | Load-side terminals of external sense resistors - connect to low-side of shunt for high-side sensing configuration |
| 3, 5 | RS1+, RS2+ | Power-side terminals of external sense resistors - connect to battery or supply rail side of shunt |
| 4 | GND | Analog ground reference for internal circuitry and output stage - must be connected to system ground plane |
| 8 | VCC | Positive supply input - accepts +3V to +28V; powers both amplifiers and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel integration | Two independent high-side current-sense amplifiers in single µMAX-8 package reduce board area vs. discrete solutions |
| Fixed +50V/V gain | Eliminates gain-setting resistors and associated layout sensitivity, improving production consistency and reducing BOM count |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery deep-discharge (e.g., Li-ion below 2.5V/cell) |
| Buffered 2mA output | Directly interfaces with SAR or delta-sigma ADCs without external op-amp buffering, simplifying signal chain design |
| AEC-Q100 qualification | Validated for automotive applications including battery management systems and ADAS power rails |
Applications
| Battery Charger Monitoring | Fuel Gauge in Smart Batteries |
|---|---|
|
Use Scenario: Real-time current measurement during CC/CV charging cycles in automotive USB-C PD chargers and laptop adapters. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated feedback to charger controller PWM logic. Use Value: Enables precise charge termination and thermal derating via 1.7MHz bandwidth and ±0.5% full-scale accuracy at +25°C. |
Use Scenario: Bidirectional current tracking in SMBus-enabled smart battery packs for state-of-charge (SoC) estimation. IC Role / Device Role / Timing Role: Dual-channel amplifier supporting simultaneous charge/discharge current sensing on shared sense resistor. Use Value: Delivers matched channel gain (±0.5% typ) and 0V common-mode operation to maintain accuracy during battery rest voltage transitions. |
| Automotive Body Control Module | Industrial Power Supply Protection |
|
Use Scenario: Load-current supervision for LED headlamp drivers and HVAC blower motors in BCM subsystems. IC Role / Device Role / Timing Role: High-side monitor feeding fault detection logic in microcontroller-based safety-critical modules. Use Value: -40°C to +125°C operation and AEC-Q100 qualification ensure reliability in under-hood environments with minimal calibration drift. |
Use Scenario: Overcurrent protection and dynamic load profiling in programmable bench power supplies and server VRMs. IC Role / Device Role / Timing Role: Precision current feedback element in analog control loops requiring fast transient response. Use Value: 10V/µs slew rate and 1.7MHz bandwidth support sub-microsecond fault detection for Class II safety compliance. |
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 |
|---|---|---|---|
| MAX40056AUB+T | Single-channel, 100V/V gain, 2.5MHz bandwidth, 1.2mA supply current | Lacks dual-channel integration; requires two devices for same functionality as MAX4377FASA+T | Select when higher gain and bandwidth are prioritized over channel density and board space |
| INA240A2DR | Single-channel, 50V/V gain, 4V/V offset, 1.1MHz bandwidth, SO-8 package | Higher offset voltage (±20µV) and lower CMR (120dB) than MAX4377FASA+T (90dB) | Prefer for cost-sensitive industrial applications where ±0.5% full-scale accuracy is not required |
Compared with MAX4377FASA+T, MAX40056AUB+T offers higher bandwidth but doubles PCB footprint for dual-channel use, while INA240A2DR trades accuracy and common-mode performance for broader availability and lower unit cost in non-automotive designs.
Availability
MAX4377FASA+T is available at Aetrix Electronics and suitable for automotive battery management, portable device fuel gauging, and industrial power supply monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX4377FASA+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 automotive, industrial, and computing applications, with emphasis on high-reliability, low-power, and thermally robust solutions.
The MAX4377 series belongs to Maxim's high-side current-sense amplifier product line, engineered specifically for accurate, ground-independent current monitoring in battery-powered and automotive systems operating across extended temperature ranges.
FAQ
What is the supply voltage range for MAX4377FASA+T?
The MAX4377FASA+T operates from a single supply voltage of +3V to +28V. This wide range allows direct connection to 12V and 24V automotive batteries as well as low-voltage portable systems. Operation is guaranteed across the full -40°C to +125°C temperature range, and the device maintains specified performance even at minimum supply voltage.
Does MAX4377FASA+T support bidirectional current sensing?
MAX4377FASA+T is optimized for unidirectional high-side current sensing and does not inherently support bidirectional operation. While it can measure current flow in one direction only (from RS+ to RS–), true bidirectional monitoring requires external circuitry such as an additional inverting stage or a dedicated bidirectional amplifier like the MAX40056. The MAX4377FASA+T datasheet confirms its intended use for single-polarity current measurement.
What is the maximum capacitive load the output of MAX4377FASA+T can drive?
The MAX4377FASA+T output is stable with capacitive loads up to 1000pF, as verified in the Electrical Characteristics table. Driving larger capacitances may cause peaking or oscillation. For ADC interface applications, a 15pF load is typical and fully supported; if driving longer traces or multiple inputs, a series resistor (e.g., 10Ω–50Ω) should be added close to the output pin to maintain stability.
How does the common-mode input range of MAX4377FASA+T behave at low voltages?
The MAX4377FASA+T maintains functional operation down to 0V common-mode input, though high-accuracy performance (±0.5% full-scale error) is specified only above +2V. Below +2V, total output error increases gradually - e.g., ±9% at VRS+ = 0.1V - making it usable for deep-discharge detection but not precision measurement in that region. This behavior is explicitly documented in the MAX4377FASA+T datasheet's electrical characteristics table.
Is MAX4377FASA+T pin-compatible with other members of the MAX4377 family?
Yes, all MAX4377 variants (T/F/H suffixes) share identical 8-pin µMAX package pinouts and electrical interfaces. The only functional difference is gain: MAX4377FASA+T provides +50V/V, while MAX4377TASA+ is +20V/V and MAX4377HASA+ is +100V/V. This allows drop-in replacement during design iteration or calibration tuning without PCB layout changes.
MAX4377FASA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
MAX4377FASA+T FAQ
1.How can I place an order for MAX4377FASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FASA+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 MAX4377FASA+T reliable?
The price and inventory of MAX4377FASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FASA+T is usually 5 days.
3.What payment methods are accepted for MAX4377FASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FASA+T?
MAX4377FASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FASA+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 MAX4377FASA+T?
For technical support, including MAX4377FASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FASA+T requirements.
6.How does Aetrix verify that MAX4377FASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4377FASA+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 MAX4377FASA+T meets industry standards.
7.What is the process for return or replacement of MAX4377FASA+T?
All MAX4377FASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FASA+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 MAX4377FASA+T part is unused and in its original packaging.
Return procedure for MAX4377FASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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