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Analog Devices Inc./Maxim Integrated MAX4378FASD
- Part No.:
- MAX4378FASD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4378FASD.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,435
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Product details
Overview
MAX4378FASD from Maxim Integrated is a dual-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 monitoring and fuel-gauge feedback in automotive and portable systems.
For engineers reviewing the MAX4378FASD datasheet, MAX4378FASD pinout, MAX4378FASD application, or MAX4378FASD equivalent, this page delivers verified pin functions, real-world timing behavior (400ns/800ns setting time), thermal performance (−40°C to +125°C), output drive capability (2mA), and validated alternative options for high-side sensing in space-constrained, high-reliability designs.
Technical Context
The MAX4378FASD implements a BiCMOS-based high-side sensing architecture with internal gain-setting resistors and buffered voltage output, eliminating external gain components. Its input stage operates with rail-to-rail common-mode tolerance down to 0V, enabling accurate current measurement during deep battery discharge without ground-path interference.
Each channel features independent RS+ and RS− terminals referenced to the load side of the sense resistor, with output voltage linearly proportional to ILOAD × RSENSE × 50. The device supports bidirectional sensing when used with external circuitry and maintains <±3.25% total output error across −40°C to +125°C at VSENSE = 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct voltage output scaling: VOUT = 50 × (ILOAD × RSENSE) |
| Common-Mode Input Range | 0V to +28V - functional even when battery voltage drops below VCC, critical for uninterrupted fuel-gauge operation |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V automotive and 19V notebook systems |
| Bandwidth | 1.7MHz - sufficient for closed-loop control inside fast-switching battery chargers (e.g., USB PD, Li-ion CC/CV stages) |
| Total Output Error | ±0.5% (typ) at +25°C, ±3.25% (max) over full temperature range - ensures stable current readout for safety-critical charge termination |
| Output Drive Capability | 2mA into ground-referenced load - directly interfaces with ADC inputs or comparator thresholds without buffer amplifiers |
| Supply Current per Channel | 1mA (typ) - low quiescent draw preserves battery life in always-on monitoring applications |
| Operating Temperature | −40°C to +125°C - AEC-Q100 qualified for under-hood automotive current detection and industrial embedded systems |
Pinout & Package
MAX4378FASD is housed in a 14-pin SOIC package (package code S14+1, outline 21-0041), with exposed pad not electrically connected. Pin spacing is 1.27mm, body width 3.9mm, and height 1.75mm - compatible with standard SOIC-14 reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs - each proportional to its respective channel's sense voltage (VRS+ − VRS−) × 50; drives up to 2mA |
| 2, 6, 9, 13 | RS1−, RS2−, RS3−, RS4− | Load-side sense resistor terminals - connect to low-side of shunt; high-impedance inputs minimize loading error |
| 3, 5, 10, 12 | RS1+, RS2+, RS3+, RS4+ | Power-side sense resistor terminals - tolerate up to +28V common-mode regardless of VCC level |
| 4, 11 | GND | Analog ground reference - must be tied to system ground plane with low-inductance connection to minimize noise coupling |
| 8, 14 | VCC | Positive supply input - powers both channels; decoupling capacitor (0.1µF) required at pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates external gain resistors and layout sensitivity - reduces BOM count and improves production consistency |
| 0V to +28V common-mode range | Enables monitoring of battery packs in deep discharge (e.g., <2V) without signal loss or offset drift |
| ±0.5% full-scale accuracy (typ) | Supports precise charge-state estimation in smart battery systems where 1% current error translates to >3% SOC drift over cycle life |
| 1.7MHz bandwidth | Allows real-time response to transient load changes in USB-C PD adapters and multi-phase buck chargers |
| 2mA buffered output drive | Directly drives 12-bit SAR ADCs (e.g., ADS7953) without external op-amp buffering - saves board area and power |
| AEC-Q100 qualified | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - suitable for EV battery management subsystems |
Applications
| Automotive Battery Monitoring | Notebook PC Fuel Gauge |
|---|---|
|
Use Scenario: Real-time current tracking of 12V lead-acid or 48V mild-hybrid battery during engine start-stop cycles and regenerative braking. IC Role / Device Role / Timing Role: Dual-channel high-side current sensor providing isolated, ground-independent feedback to MCU-based BMS controller. Use Value: Enables accurate state-of-charge (SOC) calculation despite voltage sags below 6V - critical for cold-cranking diagnostics and battery health prediction. |
Use Scenario: Continuous current measurement across main system rail (e.g., 19V adapter input) and battery charging path in ultrabooks. IC Role / Device Role / Timing Role: Precision current-sense front-end feeding ADC for Windows ACPI battery reporting and adaptive charging algorithms. Use Value: Delivers ±0.5% accuracy over −40°C to +85°C ambient - reduces reported battery capacity error from ±8% to ±1.2% in field use. |
| USB-C Power Delivery Charger | Industrial SMPS Current Limiting |
|
Use Scenario: Bidirectional current sensing in programmable USB-C PD sink adapters supporting 100W delivery and source negotiation. IC Role / Device Role / Timing Role: Dual-channel amplifier configured for forward/reverse sensing via external switch matrix, synchronized to PD controller timing. Use Value: 400ns/800ns setting time ensures accurate current capture during dynamic PDO switching - prevents false overcurrent shutdowns. |
Use Scenario: High-side current monitoring in 24V industrial DC-DC converters with active current limiting and fault logging. IC Role / Device Role / Timing Role: Fault-detection interface between power stage and PLC or microcontroller, triggering shutdown within 1µs saturation recovery. Use Value: 1.7MHz bandwidth captures fast MOSFET shoot-through events - enables sub-100ns overcurrent response before thermal damage occurs. |
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 |
|---|---|---|---|
| INA240A2DR | Single-channel, +50V/V gain, 800kHz bandwidth, 2.5µV/°C offset drift vs. MAX4378FASD's 1.7MHz and 1.5µV/°C | Requires two devices for dual-channel function; lower bandwidth limits use in >500kHz switching chargers | Select when needing higher CMR (120dB) or integrated PWM rejection, but accept reduced speed and added component count |
| MAX4080FASA+ | Dual-channel, +50V/V, 2.5MHz bandwidth, but only −40°C to +85°C rating and no AEC-Q100 qualification | Not approved for automotive under-hood deployment; lacks extended temperature validation for battery pack integration | Choose for cost-sensitive industrial or consumer designs where full automotive temp range is unnecessary |
Compared with INA240A2DR and MAX4080FASA+, the MAX4378FASD uniquely combines dual-channel integration, AEC-Q100 qualification, 1.7MHz bandwidth, and 0V–28V common-mode operation - making it the only option that satisfies simultaneous requirements for automotive BMS, high-speed charger control, and compact PCB layout.
Availability
MAX4378FASD is available at Aetrix Electronics and suitable for automotive battery monitoring, notebook PC fuel gauges, USB-C power delivery chargers, and industrial SMPS current limiting requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX4378FASD 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 engineered specifically for high-accuracy, high-voltage-range current sensing in battery-powered systems - prioritizing ground-path integrity, wide common-mode tolerance, and minimal external component count.
FAQ
What is the maximum common-mode voltage the MAX4378FASD can handle?
The MAX4378FASD supports a guaranteed common-mode input range of 0V to +28V, independent of supply voltage. This means it remains fully functional even when the RS+ terminal is at 0V (deep battery discharge) or at 28V while VCC is only +3V. Absolute maximum rating extends to +30V, but operation beyond +28V is not specified for accuracy or linearity. The MAX4378FASD achieves this via proprietary BiCMOS input stage design that isolates common-mode rejection from supply rails.
Does the MAX4378FASD require external gain-setting resistors?
No, the MAX4378FASD does not require external gain-setting resistors. It integrates precision laser-trimmed resistors to deliver a fixed +50V/V gain per channel. This eliminates gain error sources from external component tolerance, temperature drift, and PCB layout parasitics - resulting in ±0.5% typical full-scale accuracy at +25°C and ±3.25% over −40°C to +125°C. The MAX4378FASD's buffered output further removes loading effects that could otherwise alter effective gain.
Can the MAX4378FASD be used for bidirectional current sensing?
Yes, the MAX4378FASD can be used for bidirectional current sensing when paired with external circuitry such as an analog multiplexer or H-bridge configuration. While the device itself is unidirectional (output voltage increases with positive current flow from RS+ to RS−), Figure 2 in the official datasheet demonstrates its use in bidirectional monitoring by routing RS+ and RS− to opposite sides of the sense resistor depending on current direction. The MAX4378FASD's rail-to-rail common-mode range and low offset make it well-suited for this implementation in smart battery packs and laptop fuel gauges.
What is the output short-circuit capability of the MAX4378FASD?
The MAX4378FASD output is short-circuit protected to both VCC and GND. Short circuit to GND is rated for 1 second continuously, while short circuit to VCC is rated for continuous operation. This protection is implemented via internal current-limiting circuitry that clamps output current without latch-up or permanent damage. During sustained short conditions, the MAX4378FASD maintains thermal stability up to +125°C ambient, with junction temperature limited to +150°C per absolute maximum ratings.
Is the MAX4378FASD pin-compatible with other members of the MAX437x family?
No, the MAX4378FASD is not pin-compatible with MAX4376 or MAX4377 variants due to differing channel counts and package footprints: MAX4376 uses 5-pin SOT23, MAX4377 uses 8-pin µMAX/SO, and MAX4378FASD uses 14-pin SOIC. However, all share identical pin functionality per channel (RS+, RS−, OUT, VCC, GND) and identical gain suffix coding ('F' = +50V/V). Migration requires PCB redesign but preserves schematic topology and calibration constants when scaling from single/dual to quad-channel monitoring.
MAX4378FASD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
MAX4378FASD FAQ
1.How can I place an order for MAX4378FASD through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378FASD 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 MAX4378FASD reliable?
The price and inventory of MAX4378FASD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378FASD is usually 5 days.
3.What payment methods are accepted for MAX4378FASD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378FASD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378FASD?
MAX4378FASD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378FASD 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 MAX4378FASD?
For technical support, including MAX4378FASD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378FASD requirements.
6.How does Aetrix verify that MAX4378FASD is sourced from the original manufacturer or authorized distributors?
All MAX4378FASD 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 MAX4378FASD meets industry standards.
7.What is the process for return or replacement of MAX4378FASD?
All MAX4378FASD units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378FASD, 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 MAX4378FASD part is unused and in its original packaging.
Return procedure for MAX4378FASD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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