My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX4377FAUA+T
- Part No.:
- MAX4377FAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4377FAUA+T.pdf
- Description:
- IC CURRENT SENSE 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,415
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX4377FAUA+T from Maxim Integrated is a dual-channel, high-side current-sense amplifier with fixed +50V/V gain, 0–28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and 1.7MHz bandwidth (gain = +50V/V). It operates from +3V to +28V supply, draws 1mA per amplifier, and supports automotive temperature range (−40°C to +125°C), enabling precise battery-current monitoring in notebook computers and smart battery packs.
For engineers reviewing the MAX4377FAUA+T datasheet, MAX4377FAUA+T pinout, MAX4377FAUA+T application, or MAX4377FAUA+T equivalent, key selection criteria include guaranteed high-side sensing down to 0V common-mode, buffered 2mA-output voltage interface, AEC-Q100-qualified operation, and compatibility with external sense resistors for scalable current measurement across portable and automotive power systems.
Technical Context
The MAX4377FAUA+T implements a precision high-side current-sense architecture using internal matched resistors and a current-mirror-based gain stage, delivering fixed +50V/V output scaling without external gain-setting components. Its input common-mode range remains fully functional from 0V to +28V regardless of VCC, enabling accurate sensing during deep battery discharge.
Each channel features a buffered voltage output capable of sourcing/sinking up to 2mA into ground-referenced loads, with 1.7MHz small-signal bandwidth and 1µs saturation recovery time. The device uses BiCMOS process technology and is qualified to AEC-Q100 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain enables direct voltage output proportional to sense resistor voltage drop, eliminating external feedback networks. |
| Input Common-Mode Range | 0V to +28V - supports high-side sensing even when battery voltage drops below system supply, critical for fuel gauge and charger control. |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before output clipping; sets minimum RSENSE value for target load current. |
| Supply Voltage Range | +3V to +28V - allows direct connection to 12V/24V automotive rails or wide-input DC-DC outputs without regulation. |
| Bandwidth (Gain = +50) | 1.7MHz - sufficient for real-time response inside battery-charger control loops and fast overcurrent detection. |
| Total Output Voltage Error | ±0.5% (typ, +25°C) - ensures <±1mV error at 200mV output, enabling sub-1% current measurement accuracy in stable thermal conditions. |
| Supply Current per Amplifier | 1mA (typ) - low quiescent draw supports always-on monitoring in battery-powered systems without significant runtime penalty. |
Pinout & Package
MAX4377FAUA+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 1 marked by dot; pins 2 and 6 are no-connect (N.C.).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Buffered voltage output of Channel 1; scales (RS1+ − RS1−) × 50; drives up to 2mA into ground-referenced load. |
| 2 | N.C. | No internal connection; must be left floating or tied to GND per layout best practice. |
| 3 | VCC | Positive supply input; accepts +3V to +28V; decoupling capacitor required at pin. |
| 4 | RS1− | Load-side terminal of external sense resistor for Channel 1; connects to load return path. |
| 5 | RS2− | Load-side terminal of external sense resistor for Channel 2; electrically isolated from RS1−. |
| 6 | N.C. | No internal connection; must be left floating or tied to GND per layout best practice. |
| 7 | RS2+ | Power-side terminal of external sense resistor for Channel 2; connects to battery or supply rail. |
| 8 | GND | Analog ground reference; must be connected to system ground plane with low-impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V gain | Eliminates need for external gain resistors, reducing BOM count and layout sensitivity while ensuring repeatable scaling. |
| 0V to +28V common-mode range | Enables reliable current sensing during battery deep-discharge (e.g., <2V pack voltage) without loss of accuracy or functionality. |
| Buffered 2mA output drive | Directly interfaces with ADC inputs, comparator thresholds, or microcontroller analog pins without external op-amp buffering. |
| AEC-Q100 qualification | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD robustness-suitable for under-hood applications. |
| 1.7MHz bandwidth | Supports dynamic current monitoring in switching regulator feedback paths and fast fault detection (<1µs recovery from saturation). |
Applications
| Smart Battery Fuel Gauge | Battery Charger Control Loop |
|---|---|
|
Use Scenario: Real-time bidirectional current measurement in laptop battery packs to compute state-of-charge (SoC) and detect charge/discharge termination. IC Role / Device Role / Timing Role: Dual-channel high-side current-sense amplifier providing two independent voltage outputs proportional to charge and discharge currents. Use Value: Enables ±0.5% full-scale accuracy at room temperature and stable offset over −40°C to +125°C, directly supporting coulomb counting algorithms with minimal calibration. |
Use Scenario: Closed-loop current regulation in switch-mode battery chargers where sensed current feeds back to PWM controller. IC Role / Device Role / Timing Role: High-bandwidth (+50V/V) current sensor feeding analog input of charger IC or microcontroller ADC with <1µs saturation recovery. Use Value: 1.7MHz bandwidth and 1µs recovery ensure loop stability and fast overcurrent shutdown, preventing cell damage during transient faults. |
| Notebook System Power Monitoring | Automotive Body Control Module (BCM) |
|
Use Scenario: Board-level current monitoring of CPU/GPU VRMs and peripheral rails to detect short circuits and track power budget compliance. IC Role / Device Role / Timing Role: Dual-channel high-side monitor measuring multiple supply domains simultaneously with shared VCC and GND. Use Value: Space-saving 8-pin µMAX package and 1mA/quiescent current allow integration into dense PCB layouts without thermal or power penalties. |
Use Scenario: Load current supervision in automotive BCMs for seat motor, window lift, or lighting drivers requiring fault logging and diagnostics. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual current sensor interfacing with CAN-connected microcontroller for real-time load profiling. Use Value: Guaranteed operation from −40°C to +125°C and 0–28V common-mode range support 12V/24V vehicle architectures and cold-cranking 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 integrated, ±0.2% gain error, max 26V common-mode, single-channel. | Requires microcontroller I²C interface; lacks analog voltage output for direct control loop use. | Select when digital reporting, energy accumulation, or multi-range auto-scaling are prioritized over analog loop integration. |
| MAX40056AUBB+T | Single-channel, 100V/V gain, 2.5MHz bandwidth, 0.5µA quiescent current, 12V max supply. | Lower supply voltage ceiling limits use in 24V automotive systems; optimized for ultra-low-power wearables. | Select for battery-constrained IoT sensors where 12V operation suffices and sub-µA IQ is mandatory. |
Compared with INA219AIDR and MAX40056AUBB+T, MAX4377FAUA+T uniquely delivers dual analog channels, AEC-Q100 qualification, 0–28V common-mode operation, and 1.7MHz bandwidth in a space-efficient µMAX package-making it optimal for automotive and high-performance portable power management where analog control loop fidelity and ruggedness are essential.
Availability
MAX4377FAUA+T is available at Aetrix Electronics and suitable for notebook computers, battery chargers, and automotive current-detect applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4377FAUA+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, 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 high-side current sensing in battery-powered and automotive systems-prioritizing common-mode independence, low error, and robust thermal performance.
FAQ
What is the absolute maximum common-mode voltage for MAX4377FAUA+T?
The absolute maximum common-mode voltage for MAX4377FAUA+T is +28V on RS+ pins, with operation guaranteed from 0V to +28V independent of VCC. This allows reliable sensing even when battery voltage falls below system supply, such as during deep discharge in smart battery applications. Exceeding +28V may cause permanent damage per Absolute Maximum Ratings.
Does MAX4377FAUA+T support bidirectional current sensing?
MAX4377FAUA+T is a unidirectional high-side current-sense amplifier: its output voltage increases linearly with positive current flow from RS+ to RS−. For true bidirectional sensing (e.g., charge/discharge in fuel gauges), two devices or a dedicated bidirectional part like MAX40080 is required. The MAX4377FAUA+T datasheet confirms output polarity reversal does not occur under normal operation.
What is the recommended decoupling capacitor for MAX4377FAUA+T VCC pin?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 3) and GND (Pin 8) is recommended per the MAX4377FAUA+T typical operating circuit. This minimizes high-frequency noise coupling and stabilizes the internal bias network, especially critical for maintaining ±0.5% accuracy and 1.7MHz bandwidth performance.
Is MAX4377FAUA+T pin-compatible with other MAX4377 variants?
Yes, all MAX4377 variants (T/F/H suffixes) share identical 8-pin µMAX package, pinout, and footprint (outline 21-0036). Only the internal gain differs: MAX4377FAUA+T = +50V/V, MAX4377TAUA+ = +20V/V, MAX4377HAUA+ = +100V/V. No PCB changes are required when substituting between gain versions for design optimization.
What is the thermal resistance (θJA) of the MAX4377FAUA+T µMAX package?
The junction-to-ambient thermal resistance (θJA) for MAX4377FAUA+T in the 8-pin µMAX package is 362°C/W on a standard multi-layer PCB, per JEDEC JESD51-7 test methodology. This value assumes proper thermal land design per Maxim's land pattern 90-0092; inadequate copper pour or missing thermal vias will degrade actual thermal performance.
MAX4377FAUA+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
MAX4377FAUA+T FAQ
1.How can I place an order for MAX4377FAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4377FAUA+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 MAX4377FAUA+T reliable?
The price and inventory of MAX4377FAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4377FAUA+T is usually 5 days.
3.What payment methods are accepted for MAX4377FAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4377FAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4377FAUA+T?
MAX4377FAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4377FAUA+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 MAX4377FAUA+T?
For technical support, including MAX4377FAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4377FAUA+T requirements.
6.How does Aetrix verify that MAX4377FAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4377FAUA+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 MAX4377FAUA+T meets industry standards.
7.What is the process for return or replacement of MAX4377FAUA+T?
All MAX4377FAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4377FAUA+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 MAX4377FAUA+T part is unused and in its original packaging.
Return procedure for MAX4377FAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4377FAUA+T Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
