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Analog Devices Inc./Maxim Integrated MAX4377TASA+
- Part No.:
- MAX4377TASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4377TASA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,463
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Product details
Overview
MAX4377TASA+ 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 - ideal for battery-charger control loops and automotive current detection in space-constrained systems.
For engineers reviewing the MAX4377TASA+ datasheet, MAX4377TASA+ pinout, MAX4377TASA+ application, or MAX4377TASA+ 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 documented functional and packaging distinctions.
Technical Context
The MAX4377TASA+ implements a precision high-side sensing architecture using internal matched resistors and a buffered output stage, enabling accurate current measurement without external gain-setting components. Its input common-mode voltage operates from 0V to +28V regardless of supply voltage, supporting deep-discharge battery monitoring and high-voltage rail sensing.
It integrates dual independent amplifiers in an 8-pin SO package, each with 2mA output drive capability, 1mA typical supply current per channel, and AEC-Q100-qualified operation across –40°C to +125°C. The device uses BiCMOS process technology and supports bidirectional current monitoring when paired with external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain enables direct voltage output proportional to sense resistor voltage drop, eliminating external feedback networks. |
| Common-Mode Input Range | 0V to +28V - allows monitoring of battery packs in deep discharge (e.g., <1V) while maintaining accuracy, independent of VCC level. |
| Supply Voltage Range | +3V to +28V - supports wide-input power rails including 12V automotive, 19V notebook adapters, and 24V industrial supplies. |
| Full-Scale Accuracy | ±0.5% (typ, +25°C) - ensures ≤10mV error at 100mV sense voltage, critical for fuel gauge resolution and charger current regulation. |
| Bandwidth | 2MHz (gain = +20V/V) - sufficient for closed-loop response in switching battery chargers with >500kHz switching frequencies. |
| Output Drive | 2mA into ground-referenced load - directly interfaces with ADC inputs, comparator thresholds, or microcontroller analog pins without buffering. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and portable equipment thermal environments. |
Pinout & Package
MAX4377TASA+ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, RoHS-compliant, with standard 1.27mm pitch and JEDEC MS-012 outline (S8+2). Thermal resistance θJA = 160°C/W on multi-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Buffered voltage outputs - each proportional to respective sense voltage (RS+ − RS−); drive up to 2mA into grounded loads. |
| 2, 6 | RS1−, RS2− | Load-side terminals of external sense resistors - connect to low side of shunt; referenced to GND for differential measurement. |
| 3, 5 | RS1+, RS2+ | Power-rail-side terminals of external sense resistors - connect to high side (e.g., battery+, DC bus); tolerate up to +28V common-mode. |
| 4 | GND | Analog ground reference - must be connected to system ground plane; separates signal return from power return paths for noise immunity. |
| 8 | VCC | Positive supply input - powers both amplifiers; accepts +3V to +28V; PSR ≥66dB ensures stable output despite supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +20V/V gain | Eliminates external gain resistors and layout sensitivity, reducing BOM count and improving production consistency in dual-channel monitoring. |
| 0V to +28V common-mode range | Enables accurate current sensing on battery terminals during deep discharge (<1V) or high-voltage DC buses without level-shifting circuitry. |
| Buffered 2mA output | Drives ADC reference inputs, comparator hysteresis networks, or microcontroller GPIOs directly - no op-amp buffer required. |
| AEC-Q100 qualified | Validated for automotive applications including battery management, body control modules, and ADAS power distribution units. |
| 2MHz bandwidth at +20V/V | Supports real-time current feedback in fast-switching battery chargers (e.g., USB PD 3.0, GaN-based designs) with minimal phase lag. |
Applications
| Battery Charger Control Loop | Automotive Battery Monitoring |
|---|---|
|
Use Scenario: Real-time current feedback inside constant-current/constant-voltage (CC/CV) battery charging circuits using synchronous buck or flyback topologies. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-referenced analog output proportional to charge current for PID loop correction. Use Value: Enables precise ±1% current regulation over full battery voltage range (2.5V–4.4V), preventing overcharge and extending cycle life. |
Use Scenario: Monitoring starter battery and auxiliary 12V rail current in engine control units (ECUs) and junction boxes. IC Role / Device Role / Timing Role: Dual-channel high-side sensor measuring both main battery feed and subsystem load currents simultaneously. Use Value: Detects parasitic drain >10mA at key-off, supports ISO 16750-2 load-dump immunity, and meets ASAM MCD-2 MC requirements. |
| Notebook PC Fuel Gauge | Industrial Power Supply Current Limiting |
|
Use Scenario: Estimating remaining capacity and health of Li-ion battery packs in ultrabooks and 2-in-1 devices using coulomb counting. IC Role / Device Role / Timing Role: Dual amplifier measuring charge/discharge current direction and magnitude via bidirectional shunt configuration. Use Value: Delivers ±0.5% full-scale accuracy at 100mV sense voltage, enabling <1% state-of-charge error over 300-cycle lifetime. |
Use Scenario: Implementing foldback current limiting and OCP protection in programmable DC power supplies and lab bench instruments. IC Role / Device Role / Timing Role: High-side monitor feeding analog shutdown signal to PWM controller when load exceeds preset threshold. Use Value: Responds within 400ns to overcurrent events, protecting MOSFETs and magnetics without compromising 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 |
|---|---|---|---|
| MAX4377FASA+ | +50V/V fixed gain, same 8-pin SO package, identical temperature and supply specs. | Higher gain enables use with smaller sense resistors (e.g., 5mΩ vs. 20mΩ), reducing I²R loss in high-current (>5A) applications. | Select when full-scale sense voltage must remain ≤100mV at higher load currents; requires recalculating RSENSE and scaling downstream ADC reference. |
| INA240A2DR | TI part with +50V/V gain, wider common-mode (–4V to +80V), lower offset drift (±0.5µV/°C), but larger 8-pin SOIC package with different pinout. | Supports negative common-mode for bidirectional motor current sensing; not AEC-Q100 qualified in this variant. | Choose for industrial motor drives requiring reverse-current detection; avoid if automotive qualification or pin-compatible replacement is required. |
Compared with MAX4377TASA+, MAX4377FASA+ offers higher gain in identical form factor for lower-loss shunts, while INA240A2DR extends common-mode range and drift performance at the cost of automotive qualification and pin compatibility.
Availability
MAX4377TASA+ is available at Aetrix Electronics and suitable for battery charger control loops, automotive battery monitoring, and notebook PC fuel gauge systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX4377TASA+ 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 power management ICs for demanding industrial, automotive, and computing applications.
The MAX4377 series belongs to Maxim's high-accuracy current-sense amplifier product line, designed specifically for high-side monitoring in battery-powered and automotive systems where ground-path integrity and wide common-mode operation are essential.
FAQ
What is the maximum common-mode voltage supported by MAX4377TASA+?
The MAX4377TASA+ supports a common-mode input voltage range of 0V to +28V, independent of supply voltage. This allows it to accurately monitor current in deeply discharged batteries (e.g., below 1V) or high-voltage DC rails without level-shifting circuitry. Absolute maximum rating is +30V on RS+ and RS− pins, but guaranteed operation is specified up to +28V.
Does MAX4377TASA+ require external gain-setting resistors?
No, MAX4377TASA+ does not require external gain-setting resistors. It features an internally trimmed +20V/V gain, implemented via precision laser-trimmed resistors in BiCMOS process. This eliminates gain error due to external resistor tolerance and temperature drift, simplifying layout and improving long-term accuracy in production systems.
Can MAX4377TASA+ be used for bidirectional current sensing?
MAX4377TASA+ is unidirectional by default but can be configured for bidirectional sensing using external circuitry such as an inverting op-amp stage or differential ADC interface. The datasheet shows a MAX4377-based bidirectional fuel gauge reference design (Figure 2), confirming feasibility - however, polarity reversal requires external components since the device itself only outputs positive voltage for positive current flow.
What is the output drive capability of MAX4377TASA+?
Each output of MAX4377TASA+ can source or sink up to 2mA into a ground-referenced load while maintaining linearity and accuracy. This allows direct connection to 12-bit SAR ADC inputs (e.g., 1kΩ–10kΩ equivalent impedance), comparator reference pins, or microcontroller analog inputs without additional buffering, reducing component count and board area.
Is MAX4377TASA+ qualified for automotive applications?
Yes, MAX4377TASA+ is AEC-Q100 qualified for automotive applications. It operates across the full automotive temperature range (–40°C to +125°C), has been stress-tested per AEC-Q100 Rev G requirements, and is listed in Maxim's official ordering information as a qualified part. It is commonly deployed in battery management systems, body control modules, and ADAS power distribution units.
MAX4377TASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
MAX4377TASA+ FAQ
1.How can I place an order for MAX4377TASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377TASA+ 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 MAX4377TASA+ reliable?
The price and inventory of MAX4377TASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377TASA+ is usually 5 days.
3.What payment methods are accepted for MAX4377TASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377TASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377TASA+?
MAX4377TASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377TASA+ 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 MAX4377TASA+?
For technical support, including MAX4377TASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377TASA+ requirements.
6.How does Aetrix verify that MAX4377TASA+ is sourced from the original manufacturer or authorized distributors?
All MAX4377TASA+ 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 MAX4377TASA+ meets industry standards.
7.What is the process for return or replacement of MAX4377TASA+?
All MAX4377TASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377TASA+, 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 MAX4377TASA+ part is unused and in its original packaging.
Return procedure for MAX4377TASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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