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Analog Devices Inc./Maxim Integrated MAX4378FAUD+
- Part No.:
- MAX4378FAUD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4378FAUD+.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:738
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Product details
Overview
MAX4378FAUD+ from Maxim Integrated is a quad-channel, high-side current-sense amplifier with fixed +50V/V gain, operating from +3V to +28V supply, featuring 0–28V input common-mode range independent of VCC, ±0.5% typical full-scale accuracy at +25°C, and 1.7MHz bandwidth - designed for precision battery-charger feedback and smart-fuel-gauge monitoring in automotive and portable systems.
For engineers reviewing the MAX4378FAUD+ datasheet, MAX4378FAUD+ pinout, MAX4378FAUD+ application, or MAX4378FAUD+ equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with functional and packaging distinctions.
Technical Context
The MAX4378FAUD+ implements a BiCMOS-based high-side sensing architecture with internal gain-setting resistors and buffered voltage output, eliminating external gain components. Its input stage maintains functional operation down to 0V common-mode while preserving ±0.5% gain accuracy across -40°C to +125°C.
It delivers 2mA output drive into ground-referenced loads, supports up to 1000pF capacitive loading without oscillation, and achieves 1µs saturation recovery time - enabling stable integration inside fast-cycling battery-charge control loops and bidirectional current monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct conversion of 100mV sense voltage to 5.0V output, simplifying ADC interfacing without external resistors. |
| Common-Mode Input Range | 0V to +28V - operates reliably even when battery pack voltage drops below 1V, critical for deep-discharge fuel gauging. |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V automotive and 19V notebook systems without external regulation. |
| Bandwidth | 1.7MHz - sufficient for closed-loop response in switching charger ICs (e.g., MAX1745) with <400ns output settling time. |
| Full-Scale Accuracy | ±0.5% (typ, +25°C) - ensures ≤25mV error on 5.0V full-scale output, meeting AEC-Q100 Class 0 requirements for automotive current detection. |
| Supply Current per Channel | 1mA (typ) - quad configuration draws only 4mA total, minimizing quiescent load in always-on battery-monitoring subsystems. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments without derating. |
Pinout & Package
MAX4378FAUD+ is housed in a 14-pin TSSOP package (outline 21-0066, land pattern 90-0117), RoHS-compliant (+ suffix), with 0.65mm pitch and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT1, OUT2, OUT3, OUT4 | Buffered voltage outputs - each scales sensed current by ×50; drives up to 2mA into ground-referenced loads with <40mV low-level output. |
| 2, 6, 9, 13 | RS1–, RS2–, RS3–, RS4– | Load-side terminals of external sense resistors - connect directly to load ground side; high-impedance inputs minimize measurement error. |
| 3, 5, 10, 12 | RS1+, RS2+, RS3+, RS4+ | Power-side terminals of external sense resistors - tolerate up to +28V common-mode regardless of VCC level. |
| 4 | VCC | Positive supply input - powers all four amplifiers; accepts +3V to +28V with 66dB PSR to reject supply noise. |
| 11 | GND | Analog ground reference - single-point return for all channels; must be routed separately from power ground to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates external gain resistors and layout sensitivity, reducing BOM count and improving long-term stability vs. resistor-tolerance drift. |
| 0V to +28V common-mode range | Enables accurate current measurement during battery deep discharge (<1V) without signal loss or offset shift. |
| ±0.5% full-scale accuracy (25°C) | Supports sub-1% state-of-charge resolution in smart battery packs using standard 12-bit ADCs without calibration. |
| 1.7MHz bandwidth | Meets transient response requirements for Li-ion fast-charge algorithms where current changes must be tracked within microseconds. |
| Quad-channel integration | Monitors four independent current paths (e.g., main battery, USB-C PD, display backlight, PA bias) on one 5mm × 4.4mm footprint. |
Applications
| Battery Charger Feedback Loop | Smart Fuel Gauge |
|---|---|
|
Use Scenario: Real-time current sensing inside constant-current/constant-voltage Li-ion battery chargers using switching regulators like MAX1745. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing analog feedback to charger controller's error amplifier; operates synchronously with PWM switching frequency. Use Value: 1.7MHz bandwidth and 400ns settling time enable accurate current regulation at >500kHz switching frequencies, reducing charge-time error to <0.3%. |
Use Scenario: Bidirectional current monitoring in laptop battery packs to compute remaining capacity and health metrics. IC Role / Device Role / Timing Role: Quad-channel high-side amplifier measuring charge/discharge current on multiple cell strings or system rails. Use Value: 0–28V common-mode range and ±0.5% accuracy allow precise coulomb counting over full battery voltage range (3.0–4.45V/cell), extending fuel gauge lifetime calibration interval to >12 months. |
| Automotive Body Control Module | PA Bias Current Monitoring |
|
Use Scenario: Load-current supervision for LED headlamps, HVAC blowers, and window motors in AEC-Q100-compliant BCMs. IC Role / Device Role / Timing Role: High-side current monitor feeding diagnostic ADC inputs; detects open/short faults and overcurrent events. Use Value: -40°C to +125°C operation and 1mA/channel supply current ensure reliable fault detection during cold cranking and engine-off battery drain scenarios. |
Use Scenario: Real-time bias current tracking for RF power amplifiers in 5G base station radios and automotive radar modules. IC Role / Device Role / Timing Role: Precision current sensor delivering analog feedback to PA bias control loop for thermal stability and efficiency optimization. Use Value: 2mA output drive and buffered output interface directly with op-amp-based bias controllers, eliminating level-shifting circuitry and reducing thermal drift errors. |
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 |
|---|---|---|---|
| INA226AIDGST | 2.5V–5.5V supply only; I²C digital output; 16-bit resolution; no buffered analog output. | Requires microcontroller interface and firmware; unsuitable for analog feedback loops needing sub-µs latency. | Select when digital telemetry, multi-device bus sharing, or programmable gain are required over analog immediacy. |
| MAX4008AUB+ | Dual-channel only; +20V/V fixed gain; 2MHz bandwidth; same 14-pin TSSOP package but different pinout (no RS–/RS+ symmetry). | Limited to two sensing paths; incompatible PCB layout due to non-matching pin assignment for RS+/RS– pairs. | Choose only for dual-channel designs where gain = 20V/V suffices and board redesign is acceptable. |
Compared with MAX4378FAUD+, INA226AIDGST trades analog immediacy for digital configurability and bus scalability, while MAX4008AUB+ reduces channel count and alters pin mapping - making MAX4378FAUD+ uniquely suited for quad-channel, analog-closed-loop, automotive-grade high-side sensing without layout compromise.
Availability
MAX4378FAUD+ is available at Aetrix Electronics and suitable for automotive body control modules, notebook battery fuel gauges, and industrial battery-charger systems requiring stable component supply, AEC-Q100 compliance, and long-lifecycle support.
Supply support for MAX4378FAUD+ 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 high-reliability ICs for automotive, industrial, and computing markets.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-common-mode, high-temperature current sensing in battery-powered and automotive systems - prioritizing zero external gain components and guaranteed performance across full temperature extremes.
FAQ
What is the maximum common-mode voltage supported by MAX4378FAUD+?
The MAX4378FAUD+ supports a common-mode input range of 0V to +28V, fully independent of its supply voltage (VCC). This allows it to accurately sense current even when the battery pack voltage drops below 1V during deep discharge - a critical capability for fuel-gauge applications. The device remains functional and maintains specified accuracy down to 0V, unlike many competitors that require minimum common-mode voltage above 2V.
Does MAX4378FAUD+ require external gain-setting resistors?
No, MAX4378FAUD+ does not require external gain-setting resistors. It integrates fixed +50V/V gain internally, eliminating component count, layout sensitivity, and resistor-tolerance-induced errors. This internal gain directly converts a 100mV sense voltage across the external shunt resistor into a 5.0V output - simplifying interface with standard 5V or 3.3V ADCs and reducing total solution size.
Is MAX4378FAUD+ qualified for automotive applications?
Yes, MAX4378FAUD+ is AEC-Q100 qualified and rated for the full automotive temperature range of -40°C to +125°C. Its electrical specifications - including ±0.5% full-scale accuracy, 1.7MHz bandwidth, and 0–28V common-mode operation - are guaranteed across this range. The "+" suffix confirms RoHS compliance, and the 14-pin TSSOP package meets automotive thermal and mechanical reliability standards.
Can MAX4378FAUD+ be used for bidirectional current sensing?
MAX4378FAUD+ is optimized for unidirectional high-side current sensing. While it can detect reverse current flow (e.g., battery discharge), its output saturates near ground and lacks rail-to-rail swing or dedicated negative-sense capability. For true bidirectional applications - such as laptop smart batteries requiring charge/discharge polarity discrimination - a dedicated bidirectional amplifier like MAX4377 (dual version) or MAX4080 is recommended instead of MAX4378FAUD+.
What is the output drive capability of MAX4378FAUD+?
Each of the four buffered outputs of MAX4378FAUD+ can source or sink up to 2mA into a ground-referenced load. This allows direct driving of ADC input stages, op-amp buffers, or comparator inputs without additional amplification. The output low voltage is specified at ≤40mV (typ) with 200µA load, ensuring clean logic-level compatibility and minimal voltage drop in precision measurement paths.
MAX4378FAUD+ 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:
- 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+ FAQ
1.How can I place an order for MAX4378FAUD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378FAUD+ 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+ reliable?
The price and inventory of MAX4378FAUD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378FAUD+ is usually 5 days.
3.What payment methods are accepted for MAX4378FAUD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378FAUD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378FAUD+?
MAX4378FAUD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378FAUD+ 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+?
For technical support, including MAX4378FAUD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378FAUD+ requirements.
6.How does Aetrix verify that MAX4378FAUD+ is sourced from the original manufacturer or authorized distributors?
All MAX4378FAUD+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4378FAUD+?
All MAX4378FAUD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378FAUD+, 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+ part is unused and in its original packaging.
Return procedure for MAX4378FAUD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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