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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:1,793
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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, and 1.7MHz bandwidth. It operates from +3V to +28V supply, draws 1mA per channel, and targets battery-charger control loops and fuel-gauge monitoring in notebook computers.
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 operation, automotive-grade temperature range (–40°C to +125°C), buffered 2mA-output voltage interface, and compatibility with low-inductance sense resistors for high-frequency current sensing.
Technical Context
The MAX4377FASA-T implements a precision high-side sensing architecture using internal current-mirror gain scaling and buffered output stages. Its input common-mode range remains functional down to 0V-critical for deep-discharge battery monitoring-and is fully decoupled from VCC, enabling operation with sense voltages exceeding supply rail.
Each channel features a fixed +50V/V gain, 90dB common-mode rejection at 2V–28V, 66–90dB power-supply rejection, and supports capacitive loads up to 1000pF without oscillation. The device uses BiCMOS process technology and delivers 1µs saturation recovery and 400ns/800ns setting time for rising/falling step inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct voltage output proportional to sense resistor voltage drop, eliminating external gain-setting components. |
| Common-Mode Input Range | 0V to +28V - supports high-side sensing across full battery discharge range, including 0V, without ground-path interference. |
| Supply Voltage Range | +3V to +28V - allows single-supply operation in 3.3V, 5V, 12V, and 24V systems, including automotive and industrial power rails. |
| Bandwidth | 1.7MHz - sufficient for closed-loop response inside battery-charger control circuits and fast transient current detection. |
| Full-Scale Accuracy | ±0.5% (typ) at +25°C - ensures precise current measurement for fuel gauging and overcurrent protection thresholds. |
| Output Drive Capability | 2mA into ground-referenced load - drives ADC inputs, comparator thresholds, or microcontroller analog inputs directly without buffering. |
| Operating Temperature | –40°C to +125°C - AEC-Q100-compatible performance for under-hood automotive and industrial embedded applications. |
| Supply Current per Channel | 1mA (typ) - enables low-power current monitoring in always-on battery-powered subsystems. |
Pinout & Package
MAX4377FASA-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 counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Buffered voltage output of Channel 1; proportional to (RS1+ – RS1–) × 50; drives up to 2mA into grounded load. |
| 2 | RS1– | Load-side terminal of external sense resistor for Channel 1; connects to load return path. |
| 3 | VCC | Positive supply input; powers both channels; accepts +3V to +28V; bypass capacitor required at pin. |
| 4 | RS1+ | Power-source side terminal of external sense resistor for Channel 1; connects to battery or supply rail. |
| 5 | RS2+ | Power-source side terminal of external sense resistor for Channel 2; electrically isolated from Channel 1. |
| 6 | RS2– | Load-side terminal of external sense resistor for Channel 2; connects to second load return path. |
| 7 | OUT2 | Buffered voltage output of Channel 2; identical gain and drive capability as OUT1. |
| 8 | GND | Analog ground reference for both channels and supply return; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-side sensing channels | Enables simultaneous monitoring of two independent current paths (e.g., charge and discharge in smart battery packs) without shared ground disruption. |
| Fixed +50V/V gain | Eliminates external gain resistors and layout sensitivity; simplifies BOM and improves production consistency versus adjustable amplifiers. |
| 0V to +28V common-mode range | Allows accurate sensing during battery deep discharge (0V) and high-voltage charging (28V), independent of VCC level. |
| Buffered 2mA output stage | Drives ADC inputs, comparator references, or microcontroller GPIOs directly-no external op-amp buffer needed. |
| Automotive-grade temperature range | Validated operation from –40°C to +125°C supports deployment in engine control units, ADAS modules, and infotainment power supplies. |
| BiCMOS process technology | Delivers low input bias current (<60nA), high CMR (90dB), and fast transient response (400ns rise time) for precision DC and dynamic current sensing. |
Applications
| Smart Battery Fuel Gauge | Battery Charger Control Loop |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in laptop or tablet smart battery packs to compute state-of-charge (SoC) and remaining runtime. IC Role / Device Role / Timing Role: Dual-channel high-side current-sense amplifier providing separate charge/discharge current outputs to host microcontroller ADC. Use Value: Enables ±0.5% full-scale accuracy across –40°C to +125°C, supporting reliable fuel-gauge calibration even during thermal cycling and deep discharge. |
Use Scenario: Closed-loop current regulation in switch-mode battery chargers where real-time load current feedback adjusts PWM duty cycle. IC Role / Device Role / Timing Role: High-bandwidth (+50V/V, 1.7MHz) current sensor feeding error amplifier in charger IC control loop. Use Value: 400ns/800ns setting time ensures stable loop response to fast load transients, preventing overcurrent faults during charge-phase transitions. |
| Automotive Body Control Module | Industrial Power Supply Monitoring |
|
Use Scenario: Load-current supervision of LED headlamps, HVAC blowers, and window lift motors in vehicle body control units (BCUs). IC Role / Device Role / Timing Role: Dual-channel high-side monitor detecting open-circuit, short-circuit, and overcurrent conditions on two independent 12V/24V loads. Use Value: 0V–28V common-mode range accommodates cold-cranking (up to 28V) and deep-battery-drop (0V) events without loss of sensing integrity. |
Use Scenario: Board-level current monitoring in programmable DC power supplies and test equipment requiring traceable, calibrated current readback. IC Role / Device Role / Timing Role: Precision dual-channel current sensor interfacing to isolated sigma-delta ADC via buffered 2mA outputs. Use Value: ±0.5% accuracy at +25°C and <±3.25% over full temperature range enables Class 0.5 current measurement compliance per IEC 61000-4-30. |
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 |
|---|---|---|---|
| INA219BIDR | Single-channel, I²C digital output, 16-bit ADC integrated; ±0.2% gain error; max 26V common-mode; no buffered analog output. | Best for microcontroller-based systems needing digital current/power/voltage telemetry; unsuitable for analog control loops. | Select when digital interface, energy calculation, and low quiescent current (1mA) outweigh need for analog output or dual-channel operation. |
| MAX40056ATA+T | Dual-channel, +50V/V gain, 2.5MHz bandwidth, 0.1% gain error; wider common-mode (–0.1V to +65V); higher cost; SO-8 package. | Supports negative common-mode for bidirectional sensing in motor drives; better accuracy but lacks AEC-Q100 qualification. | Select when sub-0.1% gain error and extended common-mode range are critical, and automotive qualification is not required. |
Compared with INA219BIDR and MAX40056ATA+T, MAX4377FASA-T offers AEC-Q100 qualification, buffered analog outputs for direct control-loop integration, and optimized cost/performance balance for dual-channel high-side sensing in automotive and portable power systems.
Availability
MAX4377FASA-T is available at Aetrix Electronics and suitable for notebook computer power management, battery charger control loops, and automotive body electronics requiring stable component supply across long production lifecycles.
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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-voltage, high-side current sensing in space-constrained, battery-sensitive systems-emphasizing zero-ground-interference operation and wide common-mode tolerance.
FAQ
What is the maximum common-mode voltage the MAX4377FASA-T can handle?
The MAX4377FASA-T supports a guaranteed common-mode input range of 0V to +28V, independent of supply voltage. This means it can accurately sense current even when the sense resistor is placed between a 28V battery and load, while operating from a lower VCC such as +5V or +3.3V. Operation below 0V is not specified, and the absolute maximum rating for RS+ and RS– pins is –0.3V to +30V relative to GND.
Does the MAX4377FASA-T require external gain-setting resistors?
No, the MAX4377FASA-T does not require external gain-setting resistors. It integrates a fixed +50V/V gain amplifier per channel, configured internally via laser-trimmed resistors. This eliminates gain drift due to external component tolerances and reduces PCB area and BOM count compared to programmable current-sense amplifiers.
Can the MAX4377FASA-T be used for bidirectional current sensing?
The MAX4377FASA-T is unidirectional-it measures current flowing from RS+ to RS– only. For true bidirectional sensing (e.g., charge/discharge in smart batteries), two MAX4377FASA-T devices may be used in complementary high-side configurations, or a dedicated bidirectional amplifier like the MAX40056 should be selected. The device's output does not reverse polarity for reverse current flow.
What is the recommended bypass capacitor for the VCC pin of the MAX4377FASA-T?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 3) and GND (Pin 8) is recommended per the typical operating circuit in the MAX4377 datasheet. This minimizes supply noise and ensures stable operation, especially during fast output transitions. For high-noise environments, a parallel 1µF tantalum or X7R MLCC may be added.
Is the MAX4377FASA-T qualified for automotive applications?
Yes, the MAX4377FASA-T is AEC-Q100 qualified and rated for the full automotive temperature range of –40°C to +125°C. It meets stress testing requirements for humidity, thermal cycling, and mechanical shock per AEC-Q100 Rev H, making it suitable for use in body control modules, infotainment power supplies, and ADAS subsystems.
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:
- 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-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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