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Analog Devices Inc./Maxim Integrated MAX4378FASD+T
- Part No.:
- MAX4378FASD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4378FASD+T.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,793
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Product details
Overview
MAX4378FASD+T from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +50V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, 1.7MHz bandwidth, and automotive-grade operation from –40°C to +125°C. It enables precise battery-current monitoring in notebook computers and bidirectional fuel-gauge systems without disrupting ground paths.
For engineers reviewing the MAX4378FASD+T datasheet, MAX4378FASD+T pinout, MAX4378FASD+T application, or MAX4378FASD+T equivalent, key selection criteria include guaranteed AEC-Q100 qualification (per /V variants), buffered 2mA-output drive capability, internal gain eliminating external resistors, and compatibility with low-inductance sense resistors for high-frequency current transients.
Technical Context
The MAX4378FASD+T implements a BiCMOS-based high-side sensing architecture with rail-to-rail input stage enabling functional operation down to 0V common-mode while maintaining accuracy above +2V. Its internal current-mirror gain stage and buffered output eliminate need for external gain-setting components and support direct interfacing with ADCs or control loops.
Each channel operates independently with 1mA typical supply current per amplifier, 2.0V to +28V common-mode rejection up to 90dB, and power-supply rejection of 66–90dB across 3V–28V VCC. The device supports fast transient response: 400ns setting time (6.25mV→100mV) and 1µs saturation recovery, critical for battery-charger feedback stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain eliminates external resistor network and reduces layout sensitivity. |
| Common-Mode Input Range | 0V to +28V - enables monitoring of deeply discharged batteries and high-side sensing above VCC. |
| Full-Scale Accuracy | ±0.5% (typ, +25°C) - ensures <±5mV error at 100mV sense voltage for precision fuel gauging. |
| Bandwidth | 1.7MHz - sufficient for closed-loop control in switching battery chargers with >500kHz switching frequencies. |
| Supply Voltage Range | +3V to +28V - supports wide-input industrial and automotive power rails without external regulators. |
| Output Drive Capability | 2mA into ground-referenced load - directly drives SAR ADC inputs or comparator thresholds without buffer amplifiers. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial embedded applications. |
Pinout & Package
The MAX4378FASD+T is housed in a 14-pin SOIC package (package code S14+1, outline 21-0041), RoHS-compliant, with thermal resistance θJA = 83°C/W on multi-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced loads. |
| 2, 6, 9, 13 | RS1−, RS2−, RS3−, RS4− | Load-side terminals for four external sense resistors - dual-channel device uses pins 2/6 (CH1) and 9/13 (CH2). |
| 3, 5, 10, 12 | RS1+, RS2+, RS3+, RS4+ | Power-source-side terminals for sense resistors - CH1 uses pins 3/5; CH2 uses pins 10/12. |
| 4, 11 | GND | Analog ground reference for output stage and internal bias - must be connected to system AGND plane. |
| 8, 14 | VCC | Positive supply input - accepts +3V to +28V; powers both channels and internal bias circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified variants available | Automotive-grade reliability validated per stress test requirements - required for OEM battery management modules. |
| Buffered output with 2mA drive | Eliminates need for external op-amp buffers when driving 12-bit SAR ADCs or microcontroller analog inputs. |
| 0V to +28V common-mode range | Enables accurate current measurement during battery deep discharge (<2V) without signal loss or offset drift. |
| ±0.5% full-scale accuracy at +25°C | Reduces calibration overhead in portable systems - supports single-point factory trim for fuel-gauge applications. |
| 1.7MHz bandwidth at G=+50 | Supports real-time current monitoring in high-frequency DC-DC converters and active battery balancing circuits. |
Applications
| Notebook Battery Fuel Gauge | Bidirectional Smart Battery Pack |
|---|---|
Use Scenario: Real-time monitoring of charge/discharge current in ultrabook battery packs with integrated fuel-gauge ICs. IC Role / Device Role / Timing Role: Dual-channel high-side current sensor providing simultaneous forward/reverse current signals to fuel-gauge microcontroller. Use Value: Enables <±1% state-of-charge estimation over full battery voltage range (0–4.4V) using internal +50V/V gain and 0V–28V common-mode tolerance. | Use Scenario: Current direction and magnitude detection in USB-C PD-enabled smart battery modules with integrated protection ICs. IC Role / Device Role / Timing Role: High-side sensing element feeding bidirectional current data to battery management system (BMS) for charge termination and overcurrent shutdown. Use Value: Delivers 400ns response to current polarity reversal - critical for fast USB-C PD contract negotiation and dynamic power path control. |
| Automotive Body Control Module | Laptop AC Adapter Current Limiter |
Use Scenario: Load-current supervision of LED headlamp drivers and window motor controllers in BCMs. IC Role / Device Role / Timing Role: Dual-channel current monitor detecting open-circuit, short-circuit, and overcurrent faults in 12V/24V automotive subsystems. Use Value: Guaranteed –40°C to +125°C operation and ±0.5% accuracy enable reliable fault detection without derating or thermal compensation. | Use Scenario: Output current regulation in compact 65W GaN-based laptop AC adapters with digital control loops. IC Role / Device Role / Timing Role: High-bandwidth (+50V/V, 1.7MHz) current feedback element inside adaptive PID controller for constant-current charging mode. Use Value: 1µs saturation recovery and 1.7MHz bandwidth allow stable loop response with >200kHz switching frequency - reducing output capacitor size by 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 |
|---|---|---|---|
| MAX40056AUB+T | Single-channel, +20V/V gain, 1.5MHz bandwidth, 0.1% max gain error, 14-pin TSSOP | Higher accuracy but no dual-channel integration; requires two devices for same functionality | Select when ultra-low gain error (<±0.1%) is prioritized over channel count and board space |
| INA240A2DR | Dual-channel, +50V/V gain, 0–80V common-mode, 1.1MHz bandwidth, SOIC-8 package | Wider common-mode range but lower bandwidth and no AEC-Q100 automotive qualification | Select for industrial 48V systems requiring extended voltage range, not automotive or high-speed charger use |
Compared with MAX4378FASD+T, MAX40056AUB+T offers superior gain accuracy but doubles PCB area and BOM count for dual-channel needs, while INA240A2DR trades bandwidth and automotive qualification for higher common-mode tolerance - making MAX4378FASD+T optimal for space-constrained, high-speed, automotive-qualified dual-channel designs.
Availability
MAX4378FASD+T is available at Aetrix Electronics and suitable for notebook battery fuel gauges, automotive body control modules, and high-frequency battery charger feedback loops requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4378FASD+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) is a semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 product line was designed specifically for high-accuracy, high-voltage-range current sensing in battery-powered and automotive systems where ground-path integrity and temperature stability are critical.
FAQ
What is the maximum common-mode voltage the MAX4378FASD+T can handle?
The MAX4378FASD+T supports a guaranteed common-mode input range of 0V to +28V, independent of supply voltage. This allows it to accurately monitor current even when the battery voltage drops below 2V during deep discharge - a key requirement for notebook and smart-battery applications. Operation down to 0V is functional, though high-accuracy performance is specified from +2V onward.
Does the MAX4378FASD+T require external gain-setting resistors?
No, the MAX4378FASD+T does not require external gain-setting resistors. It features an internal fixed +50V/V gain architecture, eliminating resistor matching errors and PCB layout sensitivity. This simplifies design, improves accuracy consistency across production units, and reduces bill-of-materials cost compared to programmable current-sense amplifiers.
Is the MAX4378FASD+T qualified for automotive applications?
The MAX4378FASD+T itself is not AEC-Q100 qualified; however, its /V automotive-grade variants (e.g., MAX4378FASD/V+) are fully qualified. The MAX4378FASD+T shares identical electrical specifications, package, and pinout with /V versions - enabling drop-in qualification upgrades. For production automotive designs, Aetrix recommends verifying qualification status via official Analog Devices documentation before final release.
What is the output drive capability of the MAX4378FASD+T?
The MAX4378FASD+T provides buffered voltage outputs capable of sourcing up to 2mA into a ground-referenced load. This allows direct connection to 12-bit microcontroller ADC inputs (e.g., STM32L4, MSP430FR) without external buffering, supporting typical input impedances of ≥10kΩ. Output voltage swing is rail-to-rail within 1.2V of VCC at 2mA load, per datasheet specification.
Can the MAX4378FASD+T be used for bidirectional current sensing?
Yes, the MAX4378FASD+T supports bidirectional current sensing when configured with appropriate external circuitry - such as differential amplifiers or polarity-detecting comparators at its outputs. While the device itself is unidirectional (output scales with |VRS+ − VRS−|), its dual-channel architecture and wide common-mode range make it ideal for implementing bidirectional solutions in notebook fuel gauges and smart battery packs, as documented in Maxim Application Note 5912.
MAX4378FASD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA (x4 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:
- 14-SOIC
MAX4378FASD+T FAQ
1.How can I place an order for MAX4378FASD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378FASD+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 MAX4378FASD+T reliable?
The price and inventory of MAX4378FASD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378FASD+T is usually 5 days.
3.What payment methods are accepted for MAX4378FASD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378FASD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378FASD+T?
MAX4378FASD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378FASD+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 MAX4378FASD+T?
For technical support, including MAX4378FASD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378FASD+T requirements.
6.How does Aetrix verify that MAX4378FASD+T is sourced from the original manufacturer or authorized distributors?
All MAX4378FASD+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 MAX4378FASD+T meets industry standards.
7.What is the process for return or replacement of MAX4378FASD+T?
All MAX4378FASD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378FASD+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 MAX4378FASD+T part is unused and in its original packaging.
Return procedure for MAX4378FASD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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