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Analog Devices Inc./Maxim Integrated MAX4378TASD+T
- Part No.:
- MAX4378TASD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4378TASD+T.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
MAX4378TASD+T from Maxim Integrated is a quad-channel, high-side current-sense amplifier with fixed +20V/V gain, designed for precision battery-current monitoring in automotive and industrial power systems. It operates from +3V to +28V supply, supports 0V to +28V input common-mode voltage independent of VCC, delivers ±0.5% typical full-scale accuracy at +25°C, and features buffered 2mA-drive outputs. It is used in battery chargers and smart fuel gauges where ground-path integrity and deep-discharge sensing are critical.
For engineers reviewing the MAX4378TASD+T datasheet, MAX4378TASD+T pinout, MAX4378TASD+T application, or MAX4378TASD+T equivalent, key selection criteria include its AEC-Q100-qualified 14-pin SOIC package, -40°C to +125°C automotive temperature range, 2MHz bandwidth at G=20, ±0.5% gain accuracy over temperature, and compatibility with external sense resistors down to 10mΩ for 10A full-scale current measurement.
Technical Context
The MAX4378TASD+T 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 (0V to +28V) remains fully functional even when VCC is as low as +3V - essential for monitoring deeply discharged battery packs.
Each of its four channels provides buffered voltage output with 2mA drive capability into ground-referenced loads, 1mA typical supply current per channel, and 2MHz small-signal bandwidth at G=20. The device uses BiCMOS process technology and is AEC-Q100 qualified for automotive applications requiring robustness across harsh thermal and electrical environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain enables direct interface with 100mV full-scale sense voltage and eliminates external resistor networks. |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V/24V automotive systems and industrial DC supplies. |
| Input Common-Mode Range | 0V to +28V, independent of VCC - allows accurate current sensing during battery deep discharge (e.g., <1V pack voltage) without loss of functionality. |
| Full-Scale Accuracy | ±0.5% typical at +25°C - ensures precise current reporting for fuel gauge and overcurrent protection logic in safety-critical systems. |
| Bandwidth | 2MHz at G=20 - sufficient for real-time response inside battery-charger control loops and fast transient detection. |
| Operating Temperature | -40°C to +125°C - meets automotive AEC-Q100 Grade 1 requirements for under-hood and ECU-mounted applications. |
| Supply Current per Channel | 1mA typical - enables low-power operation in always-on monitoring circuits without compromising performance. |
Pinout & Package
The MAX4378TASD+T is housed in a 14-pin SOIC package (package code S14+1, outline 21-0041), RoHS-compliant and optimized for automated assembly and thermal reliability in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT / OUT_ | Buffered voltage output per channel - proportional to (RS+ − RS−); drives up to 2mA into ground-referenced loads without external buffering. |
| 2, 6, 9, 13 | RS− | Load-side terminal of external sense resistor - connects to load/battery return path; referenced to GND for differential sensing. |
| 3, 5, 10, 12 | RS+ | Power-side terminal of external sense resistor - connects to battery/source side; accepts 0V–28V common-mode voltage regardless of VCC. |
| 4 | GND | Analog ground reference - shared return for all four channels; must be low-impedance to minimize offset error. |
| 11 | VCC | Positive supply input - powers all four amplifiers; decoupling capacitor (0.1µF) required near pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +20V/V gain | Eliminates need for external gain resistors - reduces BOM count, layout area, and gain drift due to resistor tolerance/TC. |
| 0V to +28V common-mode input | Enables high-side sensing on batteries at voltages below VCC - critical for accurate state-of-charge estimation during deep discharge. |
| ±0.5% full-scale accuracy (typ) | Supports tight current thresholds in overcurrent protection and fuel-gauge algorithms without calibration overhead. |
| 2MHz bandwidth at G=20 | Allows integration into closed-loop charger control systems with <400ns response time to 1% final value for 100mV step inputs. |
| AEC-Q100 qualification | Validated for automotive use - includes stress testing across temperature, humidity, and vibration per industry standard. |
Applications
| Battery Charger Monitoring | Smart Fuel Gauge |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in Li-ion battery charging circuits for laptops and EV auxiliary systems. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level sense voltage across RSENSE into stable, buffered 0–2V output for ADC sampling. Use Value: Enables precise charge/discharge coulomb counting with ±0.5% gain accuracy, supporting <1% SOC error over full temperature range. |
Use Scenario: Accurate state-of-charge estimation in automotive smart battery modules with integrated fuel gauging ICs. IC Role / Device Role / Timing Role: Quad-channel analog front-end providing isolated current feedback to host microcontroller or dedicated fuel-gauge ASIC. Use Value: Four independent channels allow simultaneous monitoring of main battery, backup rail, heater circuit, and accessory load - reducing system component count. |
| Automotive Power Distribution Unit | Industrial Current-Limited PSU |
|
Use Scenario: Overcurrent detection and load diagnostics in 12V/24V vehicle power distribution units (PDUs) with multiple fused outputs. IC Role / Device Role / Timing Role: High-side monitor on each branch feeding comparator or MCU ADC for fast trip decisions (<1µs saturation recovery). Use Value: 2MHz bandwidth and 1µs saturation recovery enable sub-millisecond fault response - meeting ASIL-B diagnostic timing requirements. |
Use Scenario: Precision current limiting in programmable lab power supplies and industrial DC-DC converters with adjustable output current limits. IC Role / Device Role / Timing Role: Feedback element in current-control loop - output feeds error amplifier or digital controller to regulate output current. Use Value: Buffered 2mA output drives long traces or optocouplers directly; eliminates need for external op-amp buffer stages. |
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 |
|---|---|---|---|
| MAX4080TASA+ | +20V/V gain, 8-pin SOIC, single-channel; lower supply current (750µA), wider CMR (−0.1V to +76V), but no AEC-Q100 qualification. | Best suited for non-automotive, space-constrained single-channel designs requiring extended common-mode range. | Select MAX4080TASA+ only if single-channel operation and ultra-low quiescent current outweigh need for quad integration and automotive qualification. |
| INA240A1DR | +20V/V gain, 8-pin SOIC, single-channel; higher accuracy (±0.1% max gain error), better CMRR (120dB), but narrower CMR (−4V to +80V) and no quad option. | Preferred for high-precision industrial motor control where absolute gain error dominates over channel density. | Choose INA240A1DR when single-channel precision exceeds ±0.5% and system-level noise immunity requires >110dB CMRR. |
Compared with MAX4378TASD+T, MAX4080TASA+ offers lower power and extended common-mode range but lacks quad integration and automotive qualification; INA240A1DR delivers superior gain accuracy and CMRR yet requires four separate devices to match the integrated quad-channel functionality and AEC-Q100 compliance of MAX4378TASD+T.
Availability
MAX4378TASD+T is available at Aetrix Electronics and suitable for automotive battery management, industrial power distribution, and portable-system current monitoring requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX4378TASD+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 MAX4376/MAX4377/MAX4378 family was designed specifically for high-accuracy, high-side current sensing in battery-powered and automotive systems where ground-path integrity and deep-discharge operation are mandatory.
FAQ
What is the maximum common-mode voltage supported by MAX4378TASD+T?
The MAX4378TASD+T supports an input common-mode voltage range of 0V to +28V, independent of supply voltage - meaning it remains fully operational even when VCC is as low as +3V and the sensed node is at 0V (e.g., deeply discharged battery). This specification is guaranteed across the full -40°C to +125°C temperature range and is validated per the device's total output voltage error test.
Does MAX4378TASD+T require external gain-setting resistors?
No, MAX4378TASD+T does not require external gain-setting resistors. It integrates a fixed +20V/V gain stage using precision internal resistors and a current-mirror topology. This eliminates gain drift due to external resistor tolerance and temperature coefficient, simplifies PCB layout, and reduces bill-of-materials cost - confirmed in the "General Description" and "Features" sections of the official datasheet.
Is MAX4378TASD+T qualified for automotive applications?
Yes, MAX4378TASD+T is AEC-Q100 qualified (Grade 1, -40°C to +125°C) and explicitly listed in the Ordering Information table as an automotive-grade part. Its qualification includes stress testing for temperature cycling, humidity, mechanical shock, and ESD - making it suitable for engine control units, battery management systems, and other under-hood automotive electronics.
What is the output drive capability of MAX4378TASD+T?
Each output channel of MAX4378TASD+T provides buffered voltage output capable of sourcing up to 2mA into a ground-referenced load. This is specified in the Electrical Characteristics table under "Buffered Output Voltage with 2mA Drive" and verified across temperature and supply conditions - enabling direct connection to ADC inputs, comparators, or optocouplers without additional buffering.
Can MAX4378TASD+T be used for bidirectional current sensing?
MAX4378TASD+T is a unidirectional high-side current-sense amplifier - it measures current flowing from RS+ to RS− only. For true bidirectional sensing (e.g., charge/discharge in smart batteries), the MAX4377 dual-channel variant is recommended, as shown in Figure 2 of the datasheet. MAX4378TASD+T's output saturates near 0V when reverse current occurs, and no internal phase-reversal or bipolar output capability is provided.
MAX4378TASD+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
MAX4378TASD+T FAQ
1.How can I place an order for MAX4378TASD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378TASD+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 MAX4378TASD+T reliable?
The price and inventory of MAX4378TASD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378TASD+T is usually 5 days.
3.What payment methods are accepted for MAX4378TASD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378TASD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378TASD+T?
MAX4378TASD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378TASD+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 MAX4378TASD+T?
For technical support, including MAX4378TASD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378TASD+T requirements.
6.How does Aetrix verify that MAX4378TASD+T is sourced from the original manufacturer or authorized distributors?
All MAX4378TASD+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 MAX4378TASD+T meets industry standards.
7.What is the process for return or replacement of MAX4378TASD+T?
All MAX4378TASD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378TASD+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 MAX4378TASD+T part is unused and in its original packaging.
Return procedure for MAX4378TASD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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