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Analog Devices Inc./Maxim Integrated MAX4378TAUD
- Part No.:
- MAX4378TAUD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4378TAUD.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,161
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Product details
Overview
MAX4378TAUD 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 portable 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-output voltage outputs. It is used in notebook fuel gauges and battery-charger control loops where ground-path integrity is critical.
For engineers reviewing the MAX4378TAUD datasheet, MAX4378TAUD pinout, MAX4378TAUD application, or MAX4378TAUD equivalent, key selection criteria include its quad-channel TSSOP-14 package, +20V/V fixed gain, -40°C to +125°C automotive temperature range, 2MHz bandwidth at gain=20, and high common-mode rejection (90dB) across 2V–28V.
Technical Context
The MAX4378TAUD implements a precision high-side sensing architecture using internal current-mirror gain stages and buffered output buffers. Its input common-mode range (0V to +28V) remains fully functional even when VCC is as low as +3V - enabling accurate current measurement during deep battery discharge.
Each of its four amplifiers provides fixed +20V/V gain without external resistors, delivers 2mA output drive into ground-referenced loads, and achieves 2MHz small-signal bandwidth. The device uses BiCMOS process technology and is AEC-Q100 qualified for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain eliminates need for external gain-setting resistors |
| Supply Voltage Range | +3V to +28V - supports wide-input battery and industrial power rails |
| Input Common-Mode Range | 0V to +28V, independent of VCC - enables sensing during battery deep-discharge |
| Full-Scale Accuracy | ±0.5% (typ) at +25°C - ensures precise current-to-voltage conversion for fuel gauging |
| Bandwidth | 2MHz at gain = +20V/V - sufficient for closed-loop battery-charger control |
| Output Drive Capability | 2mA into ground-referenced load - directly interfaces with ADCs or comparator inputs |
| Operating Temperature | -40°C to +125°C - meets automotive AEC-Q100 Grade 1 requirements |
| Supply Current per Channel | 1mA (typ) - enables low-power multi-channel monitoring in portable systems |
Pinout & Package
MAX4378TAUD is housed in a 14-pin TSSOP package (package code U14+1, outline 21-0066), RoHS-compliant, with 0.65mm lead pitch and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT / OUT_ | Buffered voltage output proportional to sense voltage (VRS+ − VRS−); four independent outputs |
| 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/DC source positive |
| 4 | VCC | Positive supply input for all four amplifiers; decoupling capacitor required |
| 11 | GND | Analog ground reference for all channels; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration | Four independent high-side current-sense amplifiers in single TSSOP-14 package reduce board area vs. discrete solutions |
| Fixed +20V/V gain | Eliminates external gain resistors and associated layout sensitivity, improving production consistency |
| 0V to +28V common-mode range | Enables accurate current sensing down to battery voltages near 0V without loss of functionality |
| 2mA buffered output drive | Directly drives ADC input stages or comparator thresholds without external buffer circuitry |
| AEC-Q100 qualification | Validated for automotive applications including battery management and PA bias control |
| 2MHz bandwidth | Supports dynamic current monitoring in fast-switching battery chargers and DC-DC converters |
Applications
| Automotive Battery Monitoring | Notebook Fuel Gauging |
|---|---|
|
Use Scenario: Real-time bidirectional current monitoring of 12V/48V vehicle batteries during charge/discharge cycles. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring load current upstream of ground path to preserve charger ground integrity. Use Value: Enables accurate state-of-charge estimation and overcurrent protection without compromising battery-charger grounding scheme. |
Use Scenario: Measuring charging/discharging current in ultrabook battery packs with dual-cell Li-ion configurations. IC Role / Device Role / Timing Role: Quad-channel current sensor providing simultaneous monitoring of main battery, USB-C PD port, and auxiliary rails. Use Value: Delivers ±0.5% full-scale accuracy across -40°C to +125°C, supporting reliable fuel-gauge algorithm convergence. |
| Battery-Charger Control Loop | PA Bias Current Regulation |
|
Use Scenario: Closed-loop current regulation in switch-mode battery chargers for EV on-board chargers and portable power banks. IC Role / Device Role / Timing Role: High-bandwidth (+2MHz) current feedback element feeding error signal to charger PWM controller. Use Value: Fast transient response (400ns setting time) ensures stable loop dynamics under rapidly changing load conditions. |
Use Scenario: Monitoring and regulating quiescent current in RF power amplifier bias networks for automotive telematics modules. IC Role / Device Role / Timing Role: Precision high-side current sensor detecting milliamp-level bias currents in PA front-end stages. Use Value: 0V–28V common-mode operation allows direct sensing at PA drain node, eliminating level-shifting circuitry. |
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 |
|---|---|---|---|
| INA219AIDR | I²C digital output, 16-bit ADC integrated; ±0.2% gain error; max 26V common-mode | Requires microcontroller interface; suited for smart battery systems needing digital telemetry | Select when digital bus interface and higher resolution outweigh need for analog simplicity |
| MAX4008AUB+ | Dual-channel, +50V/V fixed gain; µMAX-8 package; 1.7MHz bandwidth; same temp range | Fewer channels, higher gain - better for low-current sensing (e.g., <1A) with 10mΩ RSENSE | Select when dual-channel count and +50V/V gain match system RSENSE constraints |
Compared with MAX4378TAUD, INA219AIDR adds digital intelligence but increases BOM complexity and latency, while MAX4008AUB+ offers higher gain in smaller footprint but lacks quad-channel density - making MAX4378TAUD optimal for space-constrained, multi-rail analog current monitoring in automotive and computing platforms.
Availability
MAX4378TAUD is available at Aetrix Electronics and suitable for automotive battery management, notebook fuel gauging, and battery-charger control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4378TAUD 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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing markets.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-common-mode, high-side current sensing in battery-powered and automotive systems - prioritizing ground-path preservation, wide supply tolerance, and AEC-Q100 compliance.
FAQ
What is the maximum common-mode voltage supported by MAX4378TAUD?
MAX4378TAUD supports an input common-mode voltage range of 0V to +28V, fully independent of its supply voltage (VCC). This allows it to accurately monitor current even when the sensed node is at 0V - such as during deep battery discharge - while VCC remains at +3V or higher. The specification is guaranteed across the full -40°C to +125°C operating range.
Does MAX4378TAUD require external gain-setting resistors?
No, MAX4378TAUD does not require external gain-setting resistors. It integrates a fixed +20V/V gain stage internally, eliminating resistor matching errors and PCB layout sensitivity. This simplifies design, improves production yield, and maintains consistent gain accuracy (±0.5% typ at +25°C) across units and temperature.
Can MAX4378TAUD be used in bidirectional current sensing applications?
MAX4378TAUD is unidirectional by design - its output voltage is proportional only to (VRS+ − VRS−) and does not indicate polarity reversal. For true bidirectional sensing (e.g., charge/discharge detection), a dedicated bidirectional amplifier like MAX4377 or external signal conditioning is required. MAX4378TAUD is optimized for high-side unidirectional monitoring in chargers and power supplies.
What is the output drive capability of each channel in MAX4378TAUD?
Each of the four output channels in MAX4378TAUD can source up to 2mA into a ground-referenced load. This buffered output drives standard ADC inputs, comparators, or op-amp stages directly without external buffers. Output low voltage is ≤40mV at 200µA load, ensuring clean logic-level compatibility in monitoring circuits.
Is MAX4378TAUD qualified for automotive applications?
Yes, MAX4378TAUD is AEC-Q100 qualified (Grade 1: -40°C to +125°C) and specified for automotive use. Its BiCMOS process, robust ESD protection, and guaranteed performance across voltage, temperature, and common-mode ranges make it suitable for battery monitoring, PA bias control, and onboard charger systems in vehicles.
MAX4378TAUD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
MAX4378TAUD FAQ
1.How can I place an order for MAX4378TAUD through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378TAUD 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 MAX4378TAUD reliable?
The price and inventory of MAX4378TAUD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378TAUD is usually 5 days.
3.What payment methods are accepted for MAX4378TAUD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378TAUD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378TAUD?
MAX4378TAUD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378TAUD 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 MAX4378TAUD?
For technical support, including MAX4378TAUD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378TAUD requirements.
6.How does Aetrix verify that MAX4378TAUD is sourced from the original manufacturer or authorized distributors?
All MAX4378TAUD 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 MAX4378TAUD meets industry standards.
7.What is the process for return or replacement of MAX4378TAUD?
All MAX4378TAUD units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378TAUD, 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 MAX4378TAUD part is unused and in its original packaging.
Return procedure for MAX4378TAUD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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