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Analog Devices Inc./Maxim Integrated MAX4376FAUK
- Part No.:
- MAX4376FAUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4376FAUK.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,029
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Product details
Overview
MAX4376FAUK from Maxim Integrated is a single-channel, high-side current-sense amplifier with fixed +50V/V gain, 0V to +28V input common-mode range independent of supply voltage, ±0.5% typical full-scale accuracy at +25°C, and 2MHz bandwidth (gain = +50V/V). It operates from +3V to +28V supply, draws 1mA typical supply current, and targets battery-charger control loops and notebook power monitoring.
For engineers reviewing the MAX4376FAUK datasheet, MAX4376FAUK pinout, MAX4376FAUK application, or MAX4376FAUK equivalent, key selection criteria include its internal gain configuration, SOT23-5 package constraints, high common-mode rejection (90dB), buffered 2mA output drive, and automotive-grade temperature operation (-40°C to +125°C).
Technical Context
The MAX4376FAUK implements a precision high-side sensing architecture using an internal current-mirror-based gain stage with fixed +50V/V amplification. Its input common-mode range extends from 0V to +28V regardless of VCC, enabling accurate current measurement in deeply discharged battery systems.
It features a buffered voltage output capable of sourcing/sinking up to 2mA into ground-referenced loads, with 5Ω output resistance and 1µs saturation recovery time. The device achieves ±0.5% gain accuracy over temperature and maintains stable performance across supply voltages from +3V to +28V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - fixed internal gain eliminates external resistor network for output scaling |
| Common-Mode Input Range | 0V to +28V - functional down to 0V and independent of supply voltage, supports deep-discharge battery monitoring |
| Supply Voltage Range | +3V to +28V - enables direct integration into wide-input industrial and automotive power rails |
| Bandwidth | 1.7MHz - sufficient for closed-loop battery charger control with fast transient response |
| Full-Scale Sense Voltage | 150mV - defines maximum differential input before clipping; sets minimum RSENSE for target current range |
| Supply Current per Amplifier | 1mA typical - low quiescent consumption suitable for always-on current monitoring in portable systems |
| Total Output Voltage Error | ±3.25% max over -40°C to +125°C - includes gain and offset contributions at VSENSE = 100mV, VCC = 12V |
| Output Drive Capability | 2mA into ground-referenced load - eliminates need for external buffer in most ADC interface configurations |
Pinout & Package
MAX4376FAUK is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+1, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for internal circuitry and output stage; must be connected to system ground plane |
| 2 (OUT) | Buffered voltage output | Provides gain-scaled (×50) replica of sense voltage; drives up to 2mA into grounded load |
| 3 (RS+) | High-side sense input (+) | Connects to power source side of external sense resistor; accepts up to +28V common-mode |
| 4 (VCC) | Positive supply input | Supplies internal circuitry; operates from +3V to +28V; decoupling capacitor required at pin |
| 5 (RS-) | High-side sense input (-) | Connects to load side of external sense resistor; differential input with RS+ defines VSENSE |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +50V/V internal gain | Eliminates gain-setting resistors, reduces BOM count, and avoids resistor tolerance-induced error |
| 0V to +28V common-mode range | Enables high-side sensing on batteries in deep discharge without ground-path interference |
| ±0.5% typical full-scale accuracy | Supports precise fuel gauging and current-limited supply design without calibration overhead |
| 2mA buffered output drive | Directly interfaces with 12-bit SAR ADCs or microcontroller analog inputs without external op-amp |
| -40°C to +125°C operating range | Qualified for under-hood automotive, industrial power management, and ruggedized portable equipment |
| 1.7MHz bandwidth at G = +50V/V | Meets dynamic response requirements for switching regulator current-loop compensation |
Applications
| Battery Charger Control Loop | Smart Fuel Gauge in Notebook PCs |
|---|---|
|
Use Scenario: Real-time current feedback within constant-current/constant-voltage (CC/CV) battery charging circuits. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing isolated, ground-independent analog feedback to charger controller. Use Value: Enables accurate charge termination and thermal management by delivering 1.7MHz-bandwidth, ±0.5% accurate current data without disrupting battery ground return path. |
Use Scenario: Bidirectional current monitoring for state-of-charge estimation in lithium-ion battery packs inside ultrabooks. IC Role / Device Role / Timing Role: Precision high-side sense element feeding ADC for coulomb counting algorithm. Use Value: Delivers 0V–28V common-mode operation and ±3.25% total error over full temperature range, ensuring reliable SoC calculation during deep discharge and fast charge cycles. |
| Current-Limited Industrial Power Supply | PA Bias Current Monitoring in 5G Small Cells |
|
Use Scenario: Overcurrent protection and foldback limiting in programmable DC power supplies used in test equipment. IC Role / Device Role / Timing Role: High-speed current monitor interfacing with fast comparator or microcontroller for fault detection. Use Value: 1µs saturation recovery and 1.7MHz bandwidth allow sub-microsecond response to short-circuit events, improving system reliability. |
Use Scenario: Real-time bias current tracking for GaN power amplifiers in active antenna units requiring thermal derating. IC Role / Device Role / Timing Role: High-accuracy, high-common-mode current sensor feeding FPGA-based thermal control logic. Use Value: 90dB CMR and ±0.5% gain accuracy ensure stable bias reporting despite noisy RF supply rails and wide ambient temperature swings (-40°C to +125°C). |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | Gain = +20V/V, wider common-mode (–4V to +80V), higher offset drift (±0.5µV/°C), AEC-Q100 qualified | Designed for automotive motor control; supports negative common-mode for bidirectional sensing | Select when extended common-mode range or AEC-Q100 compliance is mandatory; requires external gain adjustment for +50V/V equivalent |
| MAX40056ATA+T | Gain = +50V/V, lower bandwidth (1.2MHz), improved offset (±50µV max), same SOT23-5 package | Optimized for ultra-low-power portable systems; lower supply current (350µA) but reduced speed | Select when power budget is tighter than bandwidth requirement; retains pin compatibility but trades transient response for quiescent current |
Compared with MAX4376FAUK, INA240A1QDRQ1 offers broader common-mode support and automotive qualification but lacks fixed +50V/V gain, while MAX40056ATA+T matches the gain and package but sacrifices 0.5MHz bandwidth and 0.65mA supply current headroom for lower power.
Availability
MAX4376FAUK is available at Aetrix Electronics and suitable for battery charger control loops, smart fuel gauge implementations, and current-limited industrial power supplies requiring stable component supply across automotive and industrial temperature grades.
Supply support for MAX4376FAUK 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 family delivers integrated high-side current sensing for space-constrained, high-reliability systems where ground-path integrity and wide common-mode operation are critical design requirements.
FAQ
What is the exact gain value and tolerance of MAX4376FAUK?
The MAX4376FAUK has a fixed internal gain of +50V/V. Gain accuracy is ±0.5% at +25°C and ±5.5% over the full –40°C to +125°C temperature range, as specified in the Electrical Characteristics table under ∆AV parameter. This tolerance includes both initial gain error and temperature-induced drift, and applies for VSENSE = 10mV to 150mV with VCC = 12V or 20V.
Can MAX4376FAUK operate with a 3.3V supply while sensing a 24V rail?
Yes, MAX4376FAUK can operate with VCC = +3.3V while monitoring a +24V high-side rail. Its input common-mode range (0V to +28V) is fully independent of supply voltage, and the device remains functional even when VRS+ exceeds VCC by up to 24.7V. The output will swing between ~25mV (low) and (VCC – 0.9V) (high) under load, preserving signal integrity for downstream ADCs.
What is the maximum capacitive load the MAX4376FAUK output can drive without oscillation?
The MAX4376FAUK output is stable with up to 1000pF of capacitive load, as confirmed in the Electrical Characteristics table under "Maximum Capacitive Load." Driving larger capacitances may cause peaking or sustained oscillation; if >1000pF is required, an external series resistor (e.g., 10Ω–50Ω) should be added close to the output pin to isolate the capacitance.
Does MAX4376FAUK support bidirectional current sensing?
No, MAX4376FAUK is a unidirectional high-side current-sense amplifier. Its output voltage is proportional only to (VRS+ – VRS–) and goes to near-zero when VRS– ≥ VRS+, with no phase reversal or negative output swing. For bidirectional sensing, dual-channel devices like MAX4377FAUA+ or dedicated bidirectional amplifiers (e.g., MAX4080) are required.
What is the recommended decoupling for MAX4376FAUK VCC pin?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 4) and GND (Pin 1) is mandatory per the Typical Operating Circuit in the datasheet. This minimizes supply noise coupling into the sensitive analog front-end and ensures stability during fast load transients. No bulk capacitance is required unless long PCB traces exist between the supply source and the IC.
MAX4376FAUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 120 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1mA
- 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:
- SOT-23-5
MAX4376FAUK FAQ
1.How can I place an order for MAX4376FAUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4376FAUK 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 MAX4376FAUK reliable?
The price and inventory of MAX4376FAUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4376FAUK is usually 5 days.
3.What payment methods are accepted for MAX4376FAUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4376FAUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4376FAUK?
MAX4376FAUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4376FAUK 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 MAX4376FAUK?
For technical support, including MAX4376FAUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4376FAUK requirements.
6.How does Aetrix verify that MAX4376FAUK is sourced from the original manufacturer or authorized distributors?
All MAX4376FAUK 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 MAX4376FAUK meets industry standards.
7.What is the process for return or replacement of MAX4376FAUK?
All MAX4376FAUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX4376FAUK, 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 MAX4376FAUK part is unused and in its original packaging.
Return procedure for MAX4376FAUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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