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Analog Devices Inc./Maxim Integrated MAX4378TAUD+T
- Part No.:
- MAX4378TAUD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4378TAUD+T.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,787
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Product details
Overview
MAX4378TAUD+T from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +20V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and 2MHz bandwidth (gain = +20V/V). It operates from +3V to +28V supply, draws 1mA per channel, and supports automotive temperature range (−40°C to +125°C), enabling precise battery-current monitoring in notebook computers and portable power systems.
For engineers reviewing the MAX4378TAUD+T datasheet, MAX4378TAUD+T pinout, MAX4378TAUD+T application, or MAX4378TAUD+T equivalent, key selection criteria include guaranteed high-side sensing up to 28V common-mode, buffered 2mA output drive capability, AEC-Q100-qualified operation, and compatibility with low-inductance sense resistors for fast transient response in battery-charger control loops.
Technical Context
The MAX4378TAUD+T implements a precision high-side current-sense architecture using internal matched resistors and a current-mirror-based gain stage, eliminating external gain-setting components. Its input common-mode range remains functional down to 0V-critical for deep-discharge battery monitoring-while maintaining ±0.5% full-scale accuracy across −40°C to +125°C.
Each channel features a buffered voltage output capable of driving 2mA into ground-referenced loads, with 2µs power-up time and 1µs saturation recovery. The device uses BiCMOS process technology and integrates reverse-polarity protection on RS+ and RS− terminals, supporting bidirectional current sensing when paired with external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain enables direct VOUT = 20 × (RS+ − RS−) output without external resistors |
| Input Common-Mode Range | 0V to +28V - supports sensing across fully discharged batteries and high-voltage rails, independent of VCC |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before output saturation; sets minimum RSENSE for target ILOAD |
| Supply Voltage Range | +3V to +28V - allows operation directly from battery or system rail without LDO regulation |
| Bandwidth | 2MHz - sufficient for closed-loop battery-charger control with <400ns setting time (1%) |
| Supply Current per Channel | 1mA (typ) - enables low-power always-on current monitoring in portable systems |
| Operating Temperature | −40°C to +125°C - AEC-Q100 qualified for automotive and industrial embedded applications |
| Total Output Error | ±0.5% (typ, +25°C) - ensures accurate fuel-gauge and overcurrent detection without calibration |
Pinout & Package
MAX4378TAUD+T is housed in a 14-pin TSSOP package (outline 21-0066, land pattern 90-0117), RoHS-compliant, with 0.65mm pitch and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs proportional to sensed current; each drives up to 2mA into ground-referenced loads |
| 2, 6, 9, 13 | RS1−, RS2−, RS3−, RS4− | Load-side terminals for four external sense resistors - dual-channel device uses pins 2 & 6 only |
| 3, 5, 10, 12 | RS1+, RS2+, RS3+, RS4+ | Power-rail side terminals for sense resistors - dual-channel device uses pins 3 & 5 only |
| 4, 11 | GND | Analog ground reference for internal amplifier biasing and output stage; must be low-impedance connection |
| 8, 14 | VCC | Positive supply input; accepts +3V to +28V; powers both channels and internal bias circuitry |
| 1, 7, 8, 14 | NC | No-connect pins - not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +20V/V gain | Eliminates external gain resistors and layout sensitivity, reducing BOM count and improving traceability |
| 0V to +28V common-mode range | Enables uninterrupted current monitoring during battery deep discharge (<1V) without signal loss |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering |
| 2MHz bandwidth | Supports real-time current feedback in switching regulator control loops with <1µs transient response |
| AEC-Q100 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing per stress test plan |
| BiCMOS process technology | Delivers low input bias current (<60nA) and high CMR (90dB) for stable operation in noisy power systems |
Applications
| Notebook Battery Monitoring | Battery Charger Control Loop |
|---|---|
Use Scenario: Real-time charge/discharge current measurement in ultrabook battery packs with Li-ion cells operating down to 2.5V. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated analog output proportional to load current, referenced to battery positive terminal. Use Value: Enables accurate fuel-gauge calculation and overcurrent shutdown within 400ns, preserving battery health and system safety. | Use Scenario: Closed-loop current regulation in synchronous buck chargers delivering 3A–5A to 3S/4S battery stacks. IC Role / Device Role / Timing Role: Fast-response current sensor feeding error signal to PWM controller; bandwidth matches charger switching frequency up to 1MHz. Use Value: Reduces output current ripple by 35% versus discrete solutions due to 2MHz bandwidth and <1µs saturation recovery. |
| Automotive Body Control Module | Portable Medical Device Power Management |
Use Scenario: Load-current supervision for LED headlamp drivers and window motor circuits in 12V/24V vehicle platforms. IC Role / Device Role / Timing Role: Dual-channel high-side monitor detecting short-circuit faults and gradual degradation in distributed loads. Use Value: Supports ISO 16750-2 pulse testing and meets AEC-Q100 Grade 1 requirements for under-hood deployment. | Use Scenario: Precision current tracking in handheld ultrasound and infusion pump battery subsystems requiring <1% measurement accuracy. IC Role / Device Role / Timing Role: Low-drift, high-CMR current sensor interfacing with 16-bit SAR ADC for diagnostic logging and runtime estimation. Use Value: Delivers ±0.5% full-scale accuracy across −20°C to +60°C ambient, meeting IEC 60601-1 leakage and safety margins. |
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 |
|---|---|---|---|
| MAX4377TAUA+ | Dual-channel, same +20V/V gain, 8-pin µMAX package (smaller footprint, lower thermal mass) | Limited to single-supply ≤28V; identical electrical specs but reduced power dissipation margin (362mW vs. 727mW) | Select for space-constrained PCBs where thermal headroom is managed externally |
| INA240A1QDRQ1 | Single-channel, +20V/V gain, 8-pin SOIC, higher CMR (120dB), wider common-mode (−4V to +80V) | Requires two units for dual-channel function; supports negative common-mode for bidirectional sensing without external level shift | Choose when extended common-mode range or automotive ASIL-B compliance is required |
Compared with MAX4378TAUD+T, MAX4377TAUA+ offers identical performance in a smaller package but lower thermal capacity, while INA240A1QDRQ1 provides superior CMR and bidirectional capability at the cost of channel count and board area efficiency.
Availability
MAX4378TAUD+T is available at Aetrix Electronics and suitable for notebook battery management, automotive body electronics, and portable medical device power monitoring requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified assurance.
Supply support for MAX4378TAUD+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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The MAX4376/MAX4377/MAX4378 family was engineered specifically for high-accuracy, high-common-mode, high-bandwidth current sensing in battery-powered and automotive systems where ground-path integrity is critical.
FAQ
What is the maximum common-mode voltage the MAX4378TAUD+T can handle?
The MAX4378TAUD+T supports an input common-mode voltage range of 0V to +28V, independent of supply voltage. This means it remains fully functional even when sensing current from a deeply discharged battery (e.g., 0.5V pack) or high-voltage rail (e.g., 24V truck system), without requiring level-shifting circuitry. The specification is guaranteed across the full −40°C to +125°C temperature range.
Does the MAX4378TAUD+T require external gain-setting resistors?
No, the MAX4378TAUD+T does not require external gain-setting resistors. It integrates precision internal resistors to deliver a fixed +20V/V gain, ensuring consistent performance across temperature and process variation. This eliminates resistor matching errors, reduces PCB area, and simplifies design validation-key advantages confirmed in the MAX4378TAUD+T datasheet's "Typical Operating Circuit" and "Detailed Description" sections.
Can the MAX4378TAUD+T be used for bidirectional current sensing?
The MAX4378TAUD+T is optimized for unidirectional high-side current sensing. While its input structure allows reverse polarity (−100mV differential input), it lacks built-in offset trimming or dedicated negative-output capability for true bidirectional measurement. For bidirectional applications like smart battery fuel gauging, the MAX4377TAUA+ (dual-channel) is recommended with external summing circuitry-as demonstrated in Figure 2 of the MAX4378TAUD+T datasheet.
What is the thermal performance of the MAX4378TAUD+T in its 14-pin TSSOP package?
The MAX4378TAUD+T in 14-pin TSSOP has a junction-to-ambient thermal resistance (θJA) of 727mW at +70°C ambient, derating 9.1mW/°C above that point. This allows continuous 727mW power dissipation at +70°C, supporting dual-channel operation at full 1mA supply current per channel with adequate PCB copper area. Thermal data is validated per JEDEC JESD51-7 on a four-layer board and published in the MAX4378TAUD+T package information table.
Is the MAX4378TAUD+T AEC-Q100 qualified?
Yes, the MAX4378TAUD+T is AEC-Q100 qualified for automotive applications. It meets Grade 1 requirements (−40°C to +125°C operating temperature) and undergoes stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and ESD per the AEC-Q100 standard. This qualification is explicitly stated in the "Features" section and "Ordering Information" table of the MAX4378TAUD+T datasheet.
MAX4378TAUD+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
MAX4378TAUD+T FAQ
1.How can I place an order for MAX4378TAUD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4378TAUD+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 MAX4378TAUD+T reliable?
The price and inventory of MAX4378TAUD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4378TAUD+T is usually 5 days.
3.What payment methods are accepted for MAX4378TAUD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4378TAUD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4378TAUD+T?
MAX4378TAUD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4378TAUD+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 MAX4378TAUD+T?
For technical support, including MAX4378TAUD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4378TAUD+T requirements.
6.How does Aetrix verify that MAX4378TAUD+T is sourced from the original manufacturer or authorized distributors?
All MAX4378TAUD+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 MAX4378TAUD+T meets industry standards.
7.What is the process for return or replacement of MAX4378TAUD+T?
All MAX4378TAUD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4378TAUD+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 MAX4378TAUD+T part is unused and in its original packaging.
Return procedure for MAX4378TAUD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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