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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:2,922
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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 operation across -40°C to +125°C for automotive battery-charger monitoring. It delivers buffered voltage outputs driving up to 2mA into ground-referenced loads.
For engineers reviewing the MAX4378FAUD+T datasheet, MAX4378FAUD+T pinout, MAX4378FAUD+T application, or MAX4378FAUD+T equivalent, key selection criteria include gain-matched dual-channel sensing in TSSOP-14, high common-mode rejection (90dB), low 1mA per amplifier supply current, and AEC-Q100-compliant performance in battery-powered systems requiring precise bidirectional current measurement.
Technical Context
The MAX4378FAUD+T implements a precision high-side sensing architecture using internal current-mirror gain stages to convert differential sense voltage (VRS+ – VRS−) into a buffered output proportional to load current. Its input stage operates with rail-to-rail common-mode capability down to 0V, enabling accurate current monitoring during deep battery discharge.
Each channel features a fixed +50V/V gain, 2mA output drive capability, and 1.7MHz small-signal bandwidth at that gain setting. The device maintains ±0.5% total output voltage error over temperature and supply voltage variations when VSENSE = 100mV and VCC = 12V, supporting stable integration into closed-loop charger control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct scaling of 100mV full-scale sense voltage to 5.0V output without external resistors |
| Common-Mode Input Range | 0V to +28V - supports sensing on battery packs at near-zero voltage without loss of functionality |
| Supply Voltage Range | +3V to +28V - allows operation from single Li-ion cells up to 24V industrial rails |
| Bandwidth | 1.7MHz - sufficient for real-time response inside battery-charger feedback loops |
| Full-Scale Accuracy | ±0.5% (typ) at +25°C - ensures <±5mV error at 1V output for high-precision fuel gauging |
| Supply Current per Channel | 1mA (typ) - minimizes power overhead in always-on monitoring applications |
| Operating Temperature | -40°C to +125°C - meets automotive AEC-Q100 Grade 1 requirements |
Pinout & Package
The MAX4378FAUD+T is housed in a 14-pin TSSOP package (outline 21-0066, land pattern 90-0117), RoHS-compliant with lead-free finish (+ suffix), optimized for thermal dissipation (θJA = 9.1mW/°C derating, 727mW max at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT / OUT_ | Buffered voltage output per channel - each pin delivers gain × (VRS+ – VRS−) with 2mA drive capability |
| 2, 6, 9, 13 | RS− / RS_− | Load-side terminal of external sense resistor - connects to load/battery negative side |
| 3, 5, 10, 12 | RS+ / RS_+ | Power-side terminal of external sense resistor - connects to battery or supply positive |
| 4 | VCC | Positive supply input - powers both channels; accepts +3V to +28V |
| 11 | GND | Analog ground reference - shared return for all channels and sense resistor |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates gain-setting resistors and layout sensitivity - simplifies BOM and improves production consistency |
| 0V to +28V common-mode range | Enables reliable current sensing during battery deep-discharge states where VRS+ drops below 1V |
| ±0.5% full-scale accuracy (25°C) | Supports sub-1% state-of-charge estimation in smart battery packs without calibration |
| 1.7MHz bandwidth | Meets transient response requirements for fast-switching battery chargers operating above 500kHz |
| 2mA buffered output drive | Directly interfaces with 12-bit SAR ADCs or microcontroller analog inputs without external op-amp buffering |
Applications
| Battery Charger Monitoring | Smart Battery Fuel Gauging |
|---|---|
Use Scenario: Real-time current measurement in AC/DC laptop battery chargers with dynamic load profiles. IC Role / Device Role / Timing Role: Dual-channel high-side current sensor providing isolated feedback to charger controller PWM loop. Use Value: Enables adaptive charge termination and thermal derating based on true load current, improving safety and cycle life. |
Use Scenario: Bidirectional current tracking in portable PC battery packs with integrated fuel-gauge ICs. IC Role / Device Role / Timing Role: Precision current transducer feeding Coulomb counter with matched gain channels for charge/discharge asymmetry compensation. Use Value: Delivers ±0.5% full-scale accuracy across -40°C to +125°C, enabling <±2% remaining capacity estimation without temperature lookup tables. |
| Automotive Body Control Module | Industrial Power Supply Current Limiting |
Use Scenario: Load-current supervision in 12V/24V vehicle body electronics (e.g., seat/mirror control modules). IC Role / Device Role / Timing Role: High-side current monitor detecting short-circuit faults and overloads before fuse activation. Use Value: 90dB CMR and 1.7MHz bandwidth allow robust operation in noisy automotive environments with fast fault detection (<1µs saturation recovery). |
Use Scenario: Overcurrent protection in programmable bench power supplies with digital setpoint control. IC Role / Device Role / Timing Role: Dual-channel current feedback element for independent channel limiting and telemetry reporting. Use Value: Fixed +50V/V gain ensures consistent 100mV sense voltage maps to 5.0V output - simplifying ADC scaling and reducing firmware calibration overhead. |
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+ | Dual-channel, same +50V/V gain and µMAX-8 package, but rated only to +85°C ambient (non-automotive grade) | Limited to commercial/industrial temperature range; lacks AEC-Q100 qualification | Select when cost-sensitive non-automotive designs require identical gain and dual-channel topology in smaller footprint |
| INA240A2D | Single-channel, +50V/V gain, wider common-mode range (-4V to +80V), higher bandwidth (1.1MHz), lower offset drift (0.2µV/°C) | Requires two devices for dual-channel function; supports higher bus voltages and tighter DC accuracy | Choose for industrial systems needing extended common-mode range or lower long-term drift, accepting larger board area and dual-part count |
Compared with MAX4377FAUA+, the MAX4378FAUD+T provides guaranteed automotive-grade operation and superior thermal margin in TSSOP-14; versus INA240A2D, it offers native dual-channel integration and lower system-level component count despite narrower common-mode range.
Availability
MAX4378FAUD+T is available at Aetrix Electronics and suitable for battery chargers, smart battery fuel gauging, and automotive body control modules requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
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 semiconductor company specializing in precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX4378 belongs to Maxim's high-accuracy current-sense amplifier product line, designed specifically for high-side monitoring in battery-powered systems where ground-path integrity and deep-discharge operation are critical.
FAQ
What is the maximum common-mode voltage the MAX4378FAUD+T can handle?
The MAX4378FAUD+T supports a common-mode input range of 0V to +28V, fully independent of its supply voltage. This means it can accurately sense current even when the battery pack voltage drops to 0V during deep discharge, while maintaining functional output. Absolute maximum ratings allow VRS+ up to +30V relative to GND, but specified operation remains within 0V–28V for guaranteed accuracy and stability.
Does the MAX4378FAUD+T require external gain-setting resistors?
No, the MAX4378FAUD+T does not require external gain-setting resistors. It integrates a fixed +50V/V gain stage internally, eliminating resistor matching errors and PCB layout sensitivity. The output voltage is directly VOUT = 50 × (VRS+ – VRS−), enabling simple, compact current-sense solutions with predictable scaling - for example, a 100mV sense voltage yields exactly 5.0V output.
Can the MAX4378FAUD+T be used for bidirectional current sensing?
The MAX4378FAUD+T is unidirectional by design: its output voltage is proportional only to the magnitude of (VRS+ – VRS−) and does not indicate polarity. However, paired with external circuitry (e.g., level-shifting or differential ADC), it can support bidirectional applications - as documented in Maxim's Figure 2 using the MAX4377. For native bidirectional sensing, consider dedicated parts like the MAX40080, but the MAX4378FAUD+T remains widely deployed in dual-channel configurations for separate charge/discharge path monitoring.
What is the thermal performance of the MAX4378FAUD+T in its TSSOP-14 package?
The MAX4378FAUD+T in TSSOP-14 has a thermal resistance of θJA = 9.1mW/°C derating, allowing 727mW maximum continuous power dissipation at +70°C ambient. On a standard four-layer PCB per JEDEC JESD51-7, this supports full operation across -40°C to +125°C with adequate copper pour. Junction temperature must remain ≤+150°C; at 2mA per channel output load and 12V supply, typical power dissipation is well below thermal limits.
Is the MAX4378FAUD+T AEC-Q100 qualified?
Yes, the MAX4378FAUD+T is AEC-Q100 qualified (Grade 1: -40°C to +125°C). This qualification is explicitly stated in the "Features" section of the official datasheet and confirmed in the Ordering Information table. It meets stress testing requirements for automotive electronics, including temperature cycling, humidity bias, and ESD robustness - making it suitable for under-hood and body-control applications where reliability is mission-critical.
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:
- 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-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.
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