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Analog Devices Inc./Maxim Integrated MAX4377TAUA+
- Part No.:
- MAX4377TAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377TAUA+.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
MAX4377TAUA+ 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-designed for precision battery-current monitoring in automotive-grade notebook computers and smart battery packs.
For engineers reviewing the MAX4377TAUA+ datasheet, MAX4377TAUA+ pinout, MAX4377TAUA+ application, or MAX4377TAUA+ equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MAX4377TAUA+ implements a BiCMOS-based high-side sensing architecture that maintains accurate current measurement even when VRS+ drops to 0V (deep battery discharge), without ground-path interference. Its buffered voltage output drives up to 2mA into ground-referenced loads while rejecting supply variations with 66–90dB PSR.
It operates from +3V to +28V supply, draws 1mA per channel, and sustains full functionality across –40°C to +125°C. The internal gain is fixed at +20V/V (T-suffix), eliminating external gain-setting resistors and reducing layout sensitivity to parasitic capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +20V/V - fixed internal gain enables direct voltage output proportional to sense resistor drop, no external feedback network required. |
| Common-Mode Input Range | 0V to +28V - supports monitoring of battery packs in deep discharge and high-voltage rails exceeding VCC. |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before output saturation; sets minimum RSENSE for target load current. |
| Supply Current per Channel | 1mA (typ) - enables low-power operation in always-on battery-monitoring circuits without compromising response time. |
| Bandwidth | 2MHz - sufficient for closed-loop control in fast-switching battery chargers and DC-DC converters. |
| Total Output Voltage Error | ±0.5% (typ, +25°C) - ensures high-accuracy fuel gauging and overcurrent detection without calibration. |
| Operating Temperature | –40°C to +125°C - AEC-Q100-compatible performance for automotive and industrial embedded systems. |
Pinout & Package
MAX4377TAUA+ is housed in an 8-pin µMAX® package (outline 21-0036, land pattern 90-0092), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 marked by dot; pin count and orientation follow JEDEC MO-178 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | OUT1, OUT2 | Dual buffered voltage outputs - each proportional to respective sense voltage (VRS+ – VRS−); drive ≤2mA into ground-referenced loads. |
| 2, 6 | RS1−, RS2− | Load-side terminals of external sense resistors - connect to load/battery return path; high-impedance inputs minimize current error. |
| 3, 5 | RS1+, RS2+ | Power-side terminals of external sense resistors - connect to battery/PSU positive rail; tolerate 0–28V common-mode regardless of VCC. |
| 4 | GND | Analog ground reference - must be connected to system ground plane; separates signal return from power return to avoid ground bounce. |
| 8 | VCC | Positive supply input - accepts +3V to +28V; powers both channels; PSR >66dB minimizes supply noise coupling to output. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +20V/V gain | Eliminates external gain resistors and associated layout sensitivity, reducing BOM count and PCB area in dual-channel monitoring designs. |
| 0V to +28V common-mode range | Enables uninterrupted current sensing during battery deep discharge (<1V) and compatibility with 24V automotive systems without level-shifting. |
| ±0.5% full-scale accuracy (typ) | Supports precise fuel gauging and charge-state estimation in smart batteries without factory calibration or temperature compensation circuitry. |
| 2MHz bandwidth | Allows real-time detection of transient overcurrent events in switching charger loops and fast-response protection schemes. |
| Buffered 2mA output drive | Directly interfaces with SAR ADCs or comparator inputs without external op-amp buffering, simplifying signal chain design. |
Applications
| Automotive Battery Monitoring | Notebook PC Fuel Gauging |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in 12V/24V vehicle battery management systems for state-of-charge (SoC) and health (SoH) estimation. IC Role / Device Role / Timing Role: Dual high-side current-sense amplifier providing isolated, ground-independent analog outputs for microcontroller ADC sampling at 10kHz. Use Value: Enables accurate SoC calculation over full temperature range (–40°C to +125°C) and battery voltage range (0–28V), meeting AEC-Q100 requirements. |
Use Scenario: Simultaneous monitoring of main battery discharge current and USB-C PD charging current in ultrabooks with dual-battery architectures. IC Role / Device Role / Timing Role: Dual-channel current sensor delivering synchronized analog outputs to system PMIC's integrated ADC for dynamic power budgeting. Use Value: Reduces component count vs. discrete op-amp solutions while maintaining <±1% total error across –10°C to +70°C operating envelope. |
| Smart Battery Pack Protection | Industrial Power Supply OCP |
|
Use Scenario: Embedded current sensing in Li-ion smart battery packs compliant with SMBus/Gauge Interface standards for charge/discharge cycle tracking. IC Role / Device Role / Timing Role: High-accuracy dual amplifier feeding dedicated fuel-gauge IC (e.g., MAX17055) with calibrated voltage outputs representing load and charge currents. Use Value: Achieves ±0.5% full-scale error at +25°C and ±3.25% over full temperature range, enabling <1% SoC drift per 100 cycles. |
Use Scenario: Overcurrent protection in programmable bench power supplies where fast, repeatable trip thresholds are required across 0–30V output range. IC Role / Device Role / Timing Role: Dual high-side monitor feeding comparators for independent channel current limiting and foldback control. Use Value: 2MHz bandwidth and <800ns output settling enable sub-microsecond fault response, improving reliability under short-circuit conditions. |
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 | I²C digital output, 16-bit ADC, ±0.2% gain error, but only 0–26V common-mode range and 10kHz bandwidth. | Suitable for microcontroller-based systems requiring digital bus interface and lower bandwidth; not viable for fast charger loop closure. | Select when digital integration and calibration flexibility outweigh need for analog speed and extended common-mode range. |
| MAX40088AUB+ | Single-channel, +50V/V gain, 1.5MHz bandwidth, same µMAX-8 package, but only ±1% full-scale accuracy (typ). | Applicable where higher gain is needed for low-RSENSE designs, but accuracy-critical fuel gauging requires tighter error budget. | Choose for cost-sensitive single-channel applications where ±1% error is acceptable and gain matching to 50V/V is required. |
Compared with INA219AIDR and MAX40088AUB+, the MAX4377TAUA+ uniquely combines dual-channel analog output, 2MHz bandwidth, 0–28V common-mode tolerance, and ±0.5% accuracy in a single µMAX-8 package-making it optimal for high-fidelity, real-time analog current monitoring in automotive and premium portable systems.
Availability
MAX4377TAUA+ is available at Aetrix Electronics and suitable for automotive battery monitoring, notebook PC fuel gauging, smart battery pack protection, and industrial power supply overcurrent protection requiring stable component supply and long-term lifecycle support.
Supply support for MAX4377TAUA+ 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 industrial, automotive, and computing applications.
The MAX4377TAUA+ belongs to Maxim's high-side current-sense amplifier product line, engineered specifically for accurate, ground-independent current measurement in battery-powered and automotive systems demanding wide common-mode range and high DC accuracy.
FAQ
What is the common-mode input voltage range of the MAX4377TAUA+?
The MAX4377TAUA+ supports a 0V to +28V common-mode input voltage range that is fully independent of its supply voltage (VCC). This allows reliable current sensing even when the battery voltage drops below 1V during deep discharge, and enables use in 24V automotive systems without level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C temperature range.
Does the MAX4377TAUA+ require external gain-setting resistors?
No, the MAX4377TAUA+ does not require external gain-setting resistors. It features an internally fixed +20V/V gain (denoted by the "T" suffix), which eliminates resistor matching errors, reduces PCB footprint, and improves temperature stability compared to discrete amplifier configurations. The buffered output directly delivers a voltage proportional to the sense resistor voltage drop.
What is the supply voltage range for the MAX4377TAUA+?
The MAX4377TAUA+ operates from a single supply voltage ranging from +3V to +28V. This wide range supports direct connection to 3.3V, 5V, 12V, and 24V system rails without regulation. Its power-supply rejection ratio exceeds 66dB, ensuring minimal output voltage error due to supply ripple or noise-even at the extremes of the operating range.
Can the MAX4377TAUA+ be used for bidirectional current sensing?
The MAX4377TAUA+ is a unidirectional high-side current-sense amplifier optimized for sensing current flowing from source to load. While it can detect reverse current if VRS− exceeds VRS+, its output saturates near 0V and lacks inherent polarity indication. For true bidirectional applications (e.g., smart battery charge/discharge), a dedicated bidirectional amplifier like the MAX40088 or discrete solution is recommended instead of the MAX4377TAUA+.
What package type is used for the MAX4377TAUA+?
The MAX4377TAUA+ is packaged in an 8-pin µMAX® package (JEDEC MO-178 compliant, outline 21-0036), featuring a compact 3mm × 3mm footprint and exposed thermal pad. This RoHS-compliant package provides superior thermal performance versus SOIC-8 and is optimized for space-constrained applications such as notebook PCs and automotive ECUs where board area and thermal dissipation are critical.
MAX4377TAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-uMAX/uSOP
MAX4377TAUA+ FAQ
1.How can I place an order for MAX4377TAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377TAUA+ 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+ reliable?
The price and inventory of MAX4377TAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377TAUA+ is usually 5 days.
3.What payment methods are accepted for MAX4377TAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377TAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377TAUA+?
MAX4377TAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377TAUA+ 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+?
For technical support, including MAX4377TAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377TAUA+ requirements.
6.How does Aetrix verify that MAX4377TAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4377TAUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4377TAUA+?
All MAX4377TAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377TAUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX4377TAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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