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Analog Devices Inc./Maxim Integrated MAX4378FAUD-T
- Part No.:
- MAX4378FAUD-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4378FAUD-T.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,419
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Product details
Overview
MAX4378FAUD-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, 1.7MHz bandwidth, and automotive-grade operation from −40°C to +125°C. It enables precise battery current monitoring in notebook computers and smart battery packs without disrupting ground paths.
For engineers reviewing the MAX4378FAUD-T datasheet, MAX4378FAUD-T pinout, MAX4378FAUD-T application, or MAX4378FAUD-T equivalent, key selection criteria include its dual-channel configuration, µMAX-8 package, buffered 2mA-output voltage interface, AEC-Q100-compatibility (implied by /V ordering variants), and fixed-gain architecture eliminating external resistors for gain setting.
Technical Context
The MAX4378FAUD-T implements a precision high-side sensing topology using internal current-mirror-based amplification with fixed +50V/V gain. Its input common-mode range (0V to +28V) remains fully functional even when VRS+ drops below 2V - critical for deep-discharge battery monitoring.
It features buffered voltage outputs driving up to 2mA into ground-referenced loads, operates from +3V to +28V supply, draws 1mA per channel, and delivers 1.7MHz small-signal bandwidth at gain = +50V/V - making it suitable for real-time feedback in battery-charger control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain eliminates need for external gain-setting resistors and reduces layout sensitivity. |
| Input Common-Mode Range | 0V to +28V - supports monitoring of battery packs down to 0V without loss of functionality, independent of VCC. |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before saturation; sets resolution limit for RSENSE-based current scaling. |
| Bandwidth | 1.7MHz - enables stable closed-loop response in fast-switching battery charger applications. |
| Total Output Voltage Error | ±0.5% (typ, +25°C) - ensures high-accuracy current measurement across temperature and supply variations. |
| Supply Current per Channel | 1mA (typ) - low quiescent draw supports always-on current monitoring in portable systems. |
| Operating Temperature Range | −40°C to +125°C - qualified for under-hood automotive and industrial embedded use. |
Pinout & Package
The MAX4378FAUD-T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), measuring 3mm × 3mm × 0.8mm, RoHS-compliant, and thermally optimized for PCB heat dissipation (θJA = 362°C/W on multi-layer board).
| 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 load/battery return path for high-side sensing. |
| 3, 5 | RS1+, RS2+ | Power-source-side terminals of external sense resistors; accept 0V–28V common-mode inputs. |
| 4 | GND | Analog ground reference for internal circuitry and output stage; must be tied to system ground plane. |
| 8 | VCC | Positive supply input (3V–28V); powers both channels and defines output swing headroom. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates external gain resistors, reducing BOM count, layout area, and resistor tolerance-induced error. |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering stages. |
| 0V to +28V common-mode range | Enables accurate current measurement during battery deep discharge (<2V) without signal degradation. |
| ±0.5% full-scale accuracy (typ) | Supports fuel gauge resolution ≤1% state-of-charge error in smart battery systems. |
| AEC-Q100 qualification (via /V variants) | Validated for automotive current detection applications including battery management and PA bias control. |
Applications
| Smart Battery Fuel Gauge | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Real-time bidirectional current tracking in Li-ion battery packs to compute remaining charge and health metrics. IC Role / Device Role / Timing Role: Dual-channel high-side current sensor providing simultaneous charge/discharge current signals to fuel-gauge IC or microcontroller ADC. Use Value: Enables ±0.5% full-scale accuracy over −40°C to +125°C, supporting <1% SoC estimation error in portable computing devices. |
Use Scenario: System-level power rail current monitoring for thermal management and dynamic power budgeting in ultrabooks. IC Role / Device Role / Timing Role: Dual high-side amplifier measuring CPU/GPU rail currents with 1.7MHz bandwidth to capture transient load events. Use Value: Buffered 2mA outputs interface directly with 12-bit ADCs, eliminating external signal conditioning and reducing bill-of-materials. |
| Automotive Battery Management | Current-Limited DC-DC Charger Control |
Use Scenario: High-side current sensing in 12V/48V vehicle battery disconnect units and start-stop systems. IC Role / Device Role / Timing Role: Precision current monitor feeding safety-critical MCU for overcurrent detection and fuseless protection logic. Use Value: −40°C to +125°C operation and AEC-Q100 compatibility ensure reliability in under-hood environments with minimal derating. |
Use Scenario: Feedback element in constant-current battery charging loops using switching regulators like MAX1745. IC Role / Device Role / Timing Role: High-bandwidth (+50V/V, 1.7MHz) current sense amplifier closing control loop inside charger IC feedback path. Use Value: Fast 400ns settling time (to 1%) and low propagation delay enable stable regulation at high switching frequencies (>1MHz). |
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 |
|---|---|---|---|
| MAX4377FAUA+ | Same dual-channel +50V/V gain, identical µMAX-8 package, but lacks /V automotive qualification marking. | Suitable for industrial or commercial notebook applications where AEC-Q100 is not mandated. | Select MAX4377FAUA+ for cost-sensitive non-automotive designs requiring identical performance and footprint. |
| INA240A1D | Single-channel, +20V/V gain, SO-8 package, 85dB CMR (vs. MAX4378FAUD-T's 90dB), wider VCM (−4V to +80V). | Better suited for high-voltage motor drives or industrial supplies exceeding +28V common-mode. | Choose INA240A1D only when extended common-mode range or lower gain is required; not drop-in due to single-channel and different gain. |
Compared with MAX4378FAUD-T, MAX4377FAUA+ offers identical electrical performance and pinout but no automotive qualification, while INA240A1D provides higher common-mode tolerance at the cost of channel count, gain flexibility, and direct replaceability.
Availability
MAX4378FAUD-T is available at Aetrix Electronics and suitable for notebook computers, automotive battery management systems, and current-limited power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4378FAUD-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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX4378FAUD-T belongs to the MAX4376/MAX4377/MAX4378 family of high-side current-sense amplifiers designed specifically for accurate, resistorless current monitoring in space-constrained, battery-powered, and automotive systems.
FAQ
What is the gain configuration of the MAX4378FAUD-T?
The MAX4378FAUD-T has a fixed internal gain of +50V/V, indicated by the "F" suffix in its part number. This eliminates the need for external gain-setting resistors, reduces design complexity, and improves accuracy by removing resistor tolerance and layout parasitic effects. The gain is factory-trimmed and remains stable across temperature and supply voltage variations.
Does the MAX4378FAUD-T support bidirectional current sensing?
No - the MAX4378FAUD-T is a unidirectional high-side current-sense amplifier. It accurately measures current flow from source to load (e.g., battery discharge or charger output) but does not resolve polarity reversal. For bidirectional applications such as smart battery fuel gauges, the MAX4377 dual-channel variant is typically used with complementary external circuitry, not the MAX4378FAUD-T itself.
What package type and dimensions does the MAX4378FAUD-T use?
The MAX4378FAUD-T uses the 8-pin µMAX® package (outline 21-0036), measuring 3.0mm × 3.0mm × 0.8mm with a 0.65mm lead pitch. It is RoHS-compliant (denoted by the "+" suffix), features exposed pad thermal enhancement, and requires land pattern 90-0092 per Maxim's package documentation.
Is the MAX4378FAUD-T qualified for automotive applications?
The MAX4378FAUD-T is not explicitly marked as AEC-Q100 qualified; however, it shares the same die, process (BiCMOS), and −40°C to +125°C operating range as /V-suffixed automotive variants (e.g., MAX4378FAUD/V+T). Its design meets automotive environmental requirements, but formal AEC-Q100 certification applies only to parts ordered with the /V suffix.
What is the maximum capacitive load the MAX4378FAUD-T output can drive?
The MAX4378FAUD-T output is stable with up to 1000pF of capacitive load, as specified in the Electrical Characteristics table. Driving larger capacitances may cause peaking or oscillation. For ADC interfacing, a series resistor (e.g., 10Ω–50Ω) is recommended between OUT and the ADC input capacitor to maintain stability and reduce noise coupling.
MAX4378FAUD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
MAX4378FAUD-T FAQ
1.How can I place an order for MAX4378FAUD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378FAUD-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 MAX4378FAUD-T reliable?
The price and inventory of MAX4378FAUD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378FAUD-T is usually 5 days.
3.What payment methods are accepted for MAX4378FAUD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378FAUD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378FAUD-T?
MAX4378FAUD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378FAUD-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 MAX4378FAUD-T?
For technical support, including MAX4378FAUD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378FAUD-T requirements.
6.How does Aetrix verify that MAX4378FAUD-T is sourced from the original manufacturer or authorized distributors?
All MAX4378FAUD-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 MAX4378FAUD-T meets industry standards.
7.What is the process for return or replacement of MAX4378FAUD-T?
All MAX4378FAUD-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378FAUD-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 MAX4378FAUD-T part is unused and in its original packaging.
Return procedure for MAX4378FAUD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4378FAUD-T Tags
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