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Analog Devices Inc./Maxim Integrated MAX4377FASA
- Part No.:
- MAX4377FASA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4377FASA.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,762
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Product details
Overview
MAX4377FASA 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 (gain = +50V/V). It operates from +3V to +28V supply, draws 1mA per amplifier, and supports automotive temperature range (−40°C to +125°C), used in battery-charger control loops and notebook power monitoring.
For engineers reviewing the MAX4377FASA datasheet, MAX4377FASA pinout, MAX4377FASA application, or MAX4377FASA equivalent, key selection criteria include its dual-channel configuration, fixed +50V/V gain, buffered 2mA-output voltage interface, AEC-Q100-qualified operation, and compatibility with high-side sensing in deep-discharge battery systems.
Technical Context
The MAX4377FASA implements a precision high-side current-sense architecture using internal matched resistors and a current-mirror-based gain stage, enabling accurate amplification without external gain-setting components. Its input common-mode range remains functional down to 0V regardless of VCC, supporting battery pack monitoring during deep discharge.
It features buffered voltage outputs driving up to 2mA into ground-referenced loads, with 1.7MHz small-signal bandwidth at +50V/V gain and <800ns output settling time (1% final value) for dynamic current-loop response. Power-supply rejection exceeds 66dB across +3V to +28V supply variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain eliminates need for external resistor network and ensures stable transfer function. |
| Common-Mode Input Range | 0V to +28V - enables direct connection to battery terminals even at near-zero voltage, independent of VCC. |
| Full-Scale Accuracy | ±0.5% (typ, +25°C) - guarantees precise current measurement over temperature and supply variation. |
| Bandwidth | 1.7MHz - sufficient for closed-loop battery-charger control and fast transient current detection. |
| Supply Current | 1mA per amplifier - low quiescent draw supports always-on monitoring in portable systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded applications. |
| Output Drive | 2mA - directly interfaces with ADC inputs or comparator thresholds without external buffering. |
Pinout & Package
MAX4377FASA is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), RoHS-compliant, with exposed pad for thermal enhancement. Pin assignments are validated per Maxim's official pin configuration diagram for MAX4377 dual variants in µMAX.
| 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 load. |
| 2, 6 | RS1−, RS2− | Load-side terminals of external sense resistors; referenced to system ground path without disturbing battery return. |
| 3, 5 | RS1+, RS2+ | Power-source side terminals of external sense resistors; accept common-mode voltages up to +28V. |
| 4 | GND | Analog ground reference for internal circuitry and output stage; separate from power ground in layout-critical designs. |
| 8 | VCC | Positive supply input (+3V to +28V); powers both amplifiers and defines output swing limits. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates gain-setting resistor errors and PCB area; ensures repeatable calibration across production units. |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery deep discharge, critical for fuel-gauge accuracy. |
| Buffered 2mA output drive | Directly drives 12-bit ADCs or comparators without external op-amp stages, reducing BOM count and noise sources. |
| AEC-Q100 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing per Rev 13 specification. |
| 1.7MHz bandwidth at +50V/V | Supports real-time current feedback in switching charger control loops with <1µs saturation recovery. |
Applications
| Automotive Battery Monitoring | Notebook Computer Power Management |
|---|---|
|
Use Scenario: Real-time current tracking of 12V lead-acid or Li-ion starter batteries during engine cranking and regenerative braking. 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 interrupting ground return path. |
Use Scenario: Dynamic load-current monitoring on CPU/GPU VRM rails and battery charge/discharge paths in ultrabooks. IC Role / Device Role / Timing Role: Dual-channel precision current sensor feeding ADC inputs for adaptive power budgeting and thermal throttling. Use Value: Delivers ±0.5% full-scale accuracy across −40°C to +125°C, ensuring reliable power management under thermal stress. |
| Battery Charger Control Loop | Smart Battery Fuel Gauge |
|
Use Scenario: Closed-loop current regulation in switch-mode battery chargers for Li-ion packs used in medical portables. IC Role / Device Role / Timing Role: High-bandwidth (+1.7MHz) current feedback element inside charger IC control loop. Use Value: Fast 800ns settling time and low propagation delay enable stable 500kHz+ switching frequency operation. |
Use Scenario: Precision coulomb counting in SMBus/I²C smart battery packs requiring bidirectional current resolution. IC Role / Device Role / Timing Role: Dual-channel amplifier configured for bidirectional sensing via differential resistor placement. Use Value: Fixed +50V/V gain and 0V–28V common-mode support enable accurate charge/discharge integration at low battery voltage. |
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 |
|---|---|---|---|
| MAX4377TASA+ | +20V/V fixed gain, identical package and temperature rating; lower gain reduces output voltage swing per mA sensed. | Suitable where full-scale current >5A and ADC input range is limited to ≤2V; less sensitive to offset error at low currents. | Select when higher full-scale current range is needed and system can tolerate reduced resolution at sub-100mA levels. |
| MAX4377HASA+ | +100V/V fixed gain, same package and specs; doubles output voltage per unit sensed current versus MAX4377FASA. | Preferred for low-current (<1A) monitoring where maximizing signal-to-noise ratio is critical before ADC sampling. | Choose when measuring currents ≤1A and maximizing ADC LSB utilization is required without external amplification. |
Compared with MAX4377TASA+ and MAX4377HASA+, the MAX4377FASA offers optimal balance of resolution and dynamic range for 1A–5A battery charging and computing power-rail applications, avoiding gain-related saturation while maintaining robust SNR above 100mA.
Availability
MAX4377FASA is available at Aetrix Electronics and suitable for automotive battery monitoring, notebook computer power management, and battery charger control loops requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for MAX4377FASA 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 markets.
The MAX4377 series belongs to Maxim's high-accuracy current-sense amplifier product line, designed specifically for high-side sensing in battery-powered and automotive systems where ground-path integrity and wide common-mode operation are essential.
FAQ
What is the gain setting of MAX4377FASA and how is it implemented?
The MAX4377FASA has a fixed +50V/V gain implemented via laser-trimmed internal resistor networks and a precision current-mirror architecture. This eliminates external gain-setting components, ensures consistent performance across units, and avoids drift due to resistor tolerance or temperature coefficient. The gain is factory-set and non-adjustable; MAX4377FASA delivers exactly +50V/V output voltage per volt of differential sense voltage (VRS+ − VRS−) across its specified operating conditions.
Does MAX4377FASA support bidirectional current sensing?
MAX4377FASA itself is unidirectional-it outputs a positive voltage proportional to current flowing from RS+ to RS−. However, it can be used in bidirectional configurations by pairing two channels with opposing sense resistor orientations or integrating external level-shifting circuitry. The MAX4377FASA datasheet explicitly shows such a dual-amplifier setup for laptop fuel gauges, confirming its suitability for bidirectional applications when properly implemented in system design.
What is the maximum capacitive load the MAX4377FASA output can drive without oscillation?
The MAX4377FASA output is stable with up to 1000pF of capacitive load, as specified in the Electrical Characteristics table under "Maximum Capacitive Load." This allows direct connection to sample-and-hold circuits, RC filters, or ADC input capacitance without external isolation. Exceeding 1000pF may cause peaking or sustained oscillation; for larger loads, a series resistor (e.g., 10Ω–50Ω) should be added close to the MAX4377FASA output pin.
Is MAX4377FASA qualified for automotive applications?
Yes, MAX4377FASA is AEC-Q100 qualified per the manufacturer's Ordering Information table and Rev 13 datasheet. It meets stress test requirements for temperature cycling, high-temperature operating life, and ESD robustness applicable to automotive electronics. The device operates across the full automotive temperature range (−40°C to +125°C) and is rated for supply voltages up to +28V, making it suitable for 12V/24V vehicle subsystems including battery management and ADAS power monitoring.
How does the common-mode input range of MAX4377FASA behave below 2V?
The MAX4377FASA maintains functional operation down to 0V common-mode input, but the datasheet specifies that accuracy degrades below +2V-particularly total output voltage error increases significantly (e.g., ±32% at VRS+ = 0.1V). For high-accuracy applications like fuel gauging, use is recommended only above +2V common-mode; however, the device remains operational and stable at 0V, enabling wake-up current detection or deep-discharge state awareness where absolute precision is secondary to presence detection.
MAX4377FASA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
MAX4377FASA FAQ
1.How can I place an order for MAX4377FASA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FASA 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 reliable?
The price and inventory of MAX4377FASA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FASA is usually 5 days.
3.What payment methods are accepted for MAX4377FASA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FASA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FASA?
MAX4377FASA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FASA 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?
For technical support, including MAX4377FASA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FASA requirements.
6.How does Aetrix verify that MAX4377FASA is sourced from the original manufacturer or authorized distributors?
All MAX4377FASA 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 meets industry standards.
7.What is the process for return or replacement of MAX4377FASA?
All MAX4377FASA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FASA, 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 part is unused and in its original packaging.
Return procedure for MAX4377FASA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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