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Analog Devices Inc./Maxim Integrated MAX4377TAUA+T
- Part No.:
- MAX4377TAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377TAUA+T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,332
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Product details
Overview
MAX4377TAUA+T from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +20V/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 2MHz bandwidth - used for precision battery-charger current monitoring in automotive and portable systems.
For engineers reviewing the MAX4377TAUA+T datasheet, MAX4377TAUA+T pinout, MAX4377TAUA+T application, or MAX4377TAUA+T equivalent, key selection criteria include gain-matched dual-channel operation, AEC-Q100-compliant temperature range (−40°C to +125°C), buffered 2mA-output voltage interface, and µMAX-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX4377TAUA+T implements a precision high-side sensing architecture using internal current-mirror gain-setting (no external resistors), enabling accurate current measurement without ground-path interference - critical for battery-powered systems where charger ground integrity must be preserved. Its input common-mode range extends down to 0V, supporting deep-discharge battery monitoring.
Each channel delivers a buffered voltage output proportional to (VRS+ − VRS−) × 20, with total output error ≤ ±3.25% over full temperature and supply range, and ≤ ±0.5% at +25°C. The device uses BiCMOS process technology and achieves 10V/µs slew rate with 15pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain eliminates need for external gain-setting resistors and ensures consistent channel-to-channel matching. |
| Supply Voltage Range | +3V to +28V - supports wide-input battery systems including 12V, 24V automotive rails and multi-cell Li-ion packs. |
| Input Common-Mode Range | 0V to +28V, independent of VCC - enables direct connection to battery anode even during deep discharge (<1V) without loss of functionality. |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before saturation; sets minimum RSENSE for target full-scale current (e.g., 10A → 15mΩ). |
| Bandwidth | 2MHz at G = +20V/V - sufficient for closed-loop control in fast-switching battery chargers and DC-DC converters. |
| Supply Current per Channel | 1mA (typ) - low quiescent power enables always-on current monitoring in energy-sensitive applications. |
| Operating Temperature | −40°C to +125°C - AEC-Q100 qualified for under-hood automotive and industrial embedded use. |
Pinout & Package
MAX4377TAUA+T is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), RoHS-compliant, with exposed pad for thermal enhancement. Pin pitch is 0.5mm; body size is 3mm × 3mm × 0.8mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT, OUT₂ | Dual buffered voltage outputs - each proportional to its respective sense voltage × 20; drive up to 2mA into ground-referenced loads. |
| 2, 6 | RS−, RS₂− | Load-side terminals of external sense resistors - connect to low-side of shunt; high-impedance inputs minimize loading error. |
| 3, 5 | RS+, RS₂+ | Power-side terminals of external sense resistors - connect to high-voltage rail (e.g., battery anode); tolerate 0–28V CM range. |
| 4 | GND | Analog ground reference - must be connected to system ground plane; separate from power ground if noise isolation required. |
| 8 | VCC | Positive supply input - powers both channels; decoupling capacitor (0.1µF) required near pin for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +20V/V gain | Eliminates external resistor network, reduces BOM count, and guarantees matched gain between dual channels for differential current analysis. |
| Buffered 2mA output drive | Directly interfaces with ADC inputs or comparator thresholds without external op-amp buffering - simplifies signal chain design. |
| 0V to +28V common-mode range | Enables high-side sensing on deeply discharged batteries (e.g., <1V Li-ion) while maintaining accuracy - no ground-referenced shunt needed. |
| ±0.5% full-scale accuracy at +25°C | Supports high-precision fuel gauging and overcurrent protection with minimal calibration overhead in production test. |
| AEC-Q100 qualified | Validated for automotive-grade reliability including HTOL, TC, ESD, and latch-up testing - suitable for ADAS power modules and EV battery management. |
Applications
| Battery Charger Current Monitoring | Fuel Gauge in Portable PCs |
|---|---|
Use Scenario: Real-time bidirectional current measurement in laptop battery charging circuits to track charge/discharge cycles and estimate remaining capacity. IC Role / Device Role / Timing Role: Dual-channel high-side current-sense amplifier - one channel monitors charge current, the other monitors discharge current. Use Value: Enables ±0.5% full-scale accuracy at +25°C and stable operation down to 0V common-mode, allowing precise coulomb counting across full battery voltage range (4.2V → 2.5V). | Use Scenario: Integration into notebook PC power management ICs to provide real-time battery current feedback for dynamic power budgeting and thermal throttling. IC Role / Device Role / Timing Role: High-bandwidth (+2MHz) current sensor feeding analog front-end of system PMIC or embedded controller. Use Value: 2MHz bandwidth supports fast transient response during CPU/GPU load changes, while 1mA supply current minimizes impact on standby battery life. |
| Automotive Body Control Module (BCM) | Industrial Power Supply Current Limiting |
Use Scenario: Monitoring load currents for lighting, HVAC, and window motors in 12V/24V automotive BCMs requiring AEC-Q100 compliance. IC Role / Device Role / Timing Role: Dual high-side current monitor providing fault detection and diagnostic feedback to microcontroller via buffered analog outputs. Use Value: −40°C to +125°C operation and 0–28V common-mode range ensure reliable performance under hood temperature extremes and battery voltage transients. | Use Scenario: Closed-loop current limiting in programmable bench power supplies and server VRMs where precise, fast-response current feedback is required. IC Role / Device Role / Timing Role: High-speed current-sense element in feedback path of switching regulator control loop. Use Value: 2MHz bandwidth and 10V/µs slew rate enable stable regulation at high switching frequencies (>500kHz), reducing output ripple and improving transient response. |
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 | Integrated 12-bit ADC, I²C interface, lower bandwidth (10kHz), ±0.2% gain error, 2.7–5.5V supply only. | Best for digital-output, low-power, single-channel monitoring in non-automotive embedded systems. | Select when digital interface and onboard conversion are preferred over analog output flexibility and wide supply range. |
| MAX40056ATA+T | Single-channel, higher gain accuracy (±0.1%), wider common-mode (−0.1V to +65V), 1.5MHz bandwidth, same µMAX-8 package. | Preferred for ultra-precision applications like medical power supplies or test equipment requiring sub-0.2% error. | Choose when absolute gain accuracy and extended negative common-mode tolerance outweigh dual-channel requirement. |
Compared with MAX4377TAUA+T, INA219AIDR trades analog output flexibility and wide supply range for integrated digitization and lower power, while MAX40056ATA+T offers superior gain accuracy and extended voltage range but lacks dual-channel capability - making MAX4377TAUA+T optimal for cost-sensitive, dual-channel automotive and portable battery monitoring where analog interfacing and robustness across 3–28V are essential.
Availability
MAX4377TAUA+T is available at Aetrix Electronics and suitable for automotive body control modules, notebook battery management systems, and industrial power supply current limiting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX4377TAUA+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 automotive, industrial, and computing applications, with emphasis on power management, sensing, and interface solutions.
The MAX4377 series belongs to Maxim's high-side current-sense amplifier product line, engineered specifically for accurate, ground-independent current monitoring in battery-powered and automotive systems where supply voltage and common-mode range vary widely.
FAQ
What is the gain configuration of MAX4377TAUA+T and how is it implemented?
The MAX4377TAUA+T features a fixed +20V/V gain implemented via internal laser-trimmed resistors and current-mirror architecture - no external gain-setting components are required. This design ensures excellent channel-to-channel gain matching and eliminates resistor tolerance errors. The 'T' suffix in MAX4377TAUA+T explicitly denotes the +20V/V version, confirmed in Maxim's ordering information table and electrical characteristics section.
Does MAX4377TAUA+T support bidirectional current sensing?
No - MAX4377TAUA+T is a unidirectional high-side current-sense amplifier optimized for sensing current flow from supply to load. It does not support reverse-polarity sensing or true bidirectional operation. For bidirectional applications (e.g., smart battery fuel gauging), Maxim recommends using two MAX4377 devices in complementary configuration or selecting purpose-built bidirectional parts like MAX40056, as noted in the Applications Information section.
What is the maximum capacitive load the output of MAX4377TAUA+T can drive without oscillation?
The MAX4377TAUA+T output is stable with up to 1000pF capacitive load, as specified in the Electrical Characteristics table under "Maximum Capacitive Load". Exceeding this value may cause sustained oscillation or degraded transient response. For driving larger ADC input capacitances, a series resistor (e.g., 10–50Ω) should be added between MAX4377TAUA+T output and ADC input to isolate capacitance.
Is MAX4377TAUA+T qualified for automotive applications?
Yes - MAX4377TAUA+T operates across the full automotive temperature range of −40°C to +125°C and is AEC-Q100 qualified, as stated in the Features list and Ordering Information table. Its 0–28V common-mode range, 1mA supply current, and µMAX-8 package make it suitable for under-hood and cabin electronics including battery management, lighting control, and motor drivers.
How does the common-mode rejection ratio (CMR) of MAX4377TAUA+T affect measurement accuracy?
The MAX4377TAUA+T provides 90dB minimum CMR for 2V ≤ VRS+ ≤ 28V at VSENSE = 100mV, meaning it rejects >99.998% of common-mode voltage variations. This ensures that output voltage depends only on the differential sense voltage (VRS+ − VRS−), even when VRS+ fluctuates due to supply ripple or load transients - critical for accurate current measurement in noisy automotive and switching-power environments.
MAX4377TAUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA (x2 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:
- 8-uMAX/uSOP
MAX4377TAUA+T FAQ
1.How can I place an order for MAX4377TAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377TAUA+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 MAX4377TAUA+T reliable?
The price and inventory of MAX4377TAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377TAUA+T is usually 5 days.
3.What payment methods are accepted for MAX4377TAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377TAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377TAUA+T?
MAX4377TAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377TAUA+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 MAX4377TAUA+T?
For technical support, including MAX4377TAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377TAUA+T requirements.
6.How does Aetrix verify that MAX4377TAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4377TAUA+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 MAX4377TAUA+T meets industry standards.
7.What is the process for return or replacement of MAX4377TAUA+T?
All MAX4377TAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377TAUA+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 MAX4377TAUA+T part is unused and in its original packaging.
Return procedure for MAX4377TAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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