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Analog Devices Inc./Maxim Integrated MAX4372FESA+
- Part No.:
- MAX4372FESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4372FESA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MAX4372FESA+ from Maxim Integrated is a precision high-side current-sense amplifier with 50V/V fixed gain, operating from 2.7V to 28V supply and consuming only 30μA quiescent current. It delivers 0.3mV input offset voltage, 0.18% full-scale accuracy, and supports 0–28V input common-mode range independent of supply voltage-enabling accurate battery current monitoring in notebook computers and smart-battery chargers.
For engineers reviewing the MAX4372FESA+ datasheet, MAX4372FESA+ pinout, MAX4372FESA+ application, or MAX4372FESA+ equivalent, this device offers verified high-side sensing capability, voltage-output architecture eliminating external gain resistors, and validated performance across -40°C to +85°C for portable power-management systems requiring low-power, high-accuracy current feedback.
Technical Context
The MAX4372FESA+ implements a high-impedance current-mirror-based topology that converts differential sense voltage (VRS+ – VRS−) into a proportional voltage output without external gain-setting components. Its input stage maintains functional operation down to 0V common-mode voltage, enabling deep-discharge battery monitoring.
It features internal clamping limiting output voltage to ≤12V, 1.5Ω output impedance for robust load driving, and 200kHz −3dB bandwidth at 50V/V gain with 10pF capacitive load-optimized for stable response in DC/DC converter current-loop feedback and battery fuel-gauge interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - fixed internal gain enables direct conversion of 20mV sense voltage to 1V output, simplifying ADC interface design. |
| Supply Voltage Range | 2.7V to 28V - supports single-supply operation across wide-input battery and industrial DC bus applications. |
| Input Common-Mode Range | 0V to 28V, supply-independent - allows monitoring of battery discharge down to 0V while maintaining valid output. |
| Full-Scale Accuracy | ±0.18% at +25°C - ensures <±1.8mV error on 100mV sense input, critical for precision battery charge-state estimation. |
| Input Offset Voltage | ±0.8mV max at +25°C - contributes <±0.04V output error at 50V/V gain, directly limiting minimum resolvable current. |
| Quiescent Current | 30μA - enables always-on current monitoring in ultra-low-power portable devices without compromising battery life. |
| −3dB Bandwidth | 200kHz at 50V/V gain - supports fast transient detection in overcurrent protection circuits and switching regulator loops. |
Pinout & Package
MAX4372FESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement. Pin functions are electrically identical across SOT23, SO, and UCSP variants per datasheet Pin/Bump Description table.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output stage; must be connected to system ground plane for accuracy. |
| 2 | OUT | Voltage output proportional to sensed current; drives ADC inputs or comparator thresholds with 1.5Ω source impedance. |
| 3 | VCC | Positive supply input; requires ≥0.1μF local decoupling capacitor to suppress switching noise coupling into gain path. |
| 4 | RS+ | High-side connection to sense resistor; accepts up to +30V absolute maximum, enabling direct placement between battery and load. |
| 5 | RS− | Load-side connection to sense resistor; forms differential input pair with RS+; no internal connection to GND or VCC. |
| 6, 7, 8 | N.C. | No internal connection - left unconnected; no electrical or thermal function; not used for PCB routing or thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-output architecture | Eliminates need for external gain resistors or op-amp feedback networks-reducing BOM count and layout sensitivity. |
| 0.18% full-scale accuracy | Enables ±0.1% current measurement resolution at full scale, meeting requirements for smart-battery fuel gauging per JEITA standards. |
| 30μA supply current | Supports continuous current monitoring in standby mode of battery-powered systems without measurable impact on runtime. |
| 0–28V common-mode range | Permits direct sensing on 2-cell Li-ion packs (0–8.4V) and 24V industrial rails without level-shifting or auxiliary supplies. |
| 50V/V fixed gain | Optimizes signal-to-noise ratio for mid-range currents (e.g., 1A–10A with 10–100mΩ sense resistors), reducing ADC quantization error. |
Applications
| Notebook Computer Power Management | Smart-Battery Charger Monitoring |
|---|---|
|
Use Scenario: Real-time battery discharge current tracking during active CPU/GPU load transitions. IC Role / Device Role / Timing Role: High-side current-sense amplifier providing analog voltage output to system microcontroller ADC. Use Value: Enables accurate remaining battery capacity estimation and thermal throttling decisions using 0.18% full-scale accuracy and 200kHz bandwidth. |
Use Scenario: Bidirectional current monitoring in CC/CV charging circuits for multi-cell Li-ion battery packs. IC Role / Device Role / Timing Role: Precision high-side sensor feeding charge/discharge current data to fuel-gauge IC or charger controller. Use Value: Supports JEITA-compliant charge termination via precise 0.3mV offset-limited current measurement across full 0–28V pack voltage range. |
| Portable Medical Device Power Supervision | Industrial DC Power Supply OCP |
|
Use Scenario: Low-power, always-on current monitoring in handheld diagnostic instruments with rechargeable batteries. IC Role / Device Role / Timing Role: Micropower (30μA) current-sense amplifier interfacing to ultra-low-power MCU with 12-bit ADC. Use Value: Delivers sub-1% current measurement accuracy while extending battery life by minimizing quiescent consumption in sleep mode. |
Use Scenario: Overcurrent protection feedback in 24V industrial DC-DC converters powering PLC I/O modules. IC Role / Device Role / Timing Role: High-bandwidth (200kHz) current monitor triggering fast shutdown when load exceeds safe threshold. Use Value: Provides 20μs settling time and supply-independent 0–28V common-mode range to detect fault conditions before MOSFET failure. |
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 |
|---|---|---|---|
| MAX4080FASA+ | 50V/V gain, 2.7V–76V supply, 125μA ICC, 120kHz BW - higher voltage rating but 4× higher quiescent current. | Preferred for 48V telecom or automotive systems where extended common-mode range outweighs power budget constraints. | Select MAX4080FASA+ only if >28V common-mode operation is required; otherwise MAX4372FESA+ offers superior micropower performance. |
| INA219AIDR | I²C digital output, 26V max common-mode, integrated 12-bit ADC, 1mA ICC - eliminates external ADC but consumes 33× more supply current. | Suitable for systems needing direct digital current/power reporting without MCU ADC resources, at cost of higher power and reduced bandwidth. | Choose INA219AIDR when digital interface and onboard ADC are prioritized; MAX4372FESA+ remains optimal for analog-loop control and ultra-low-power designs. |
Compared with MAX4080FASA+, MAX4372FESA+ reduces quiescent current by 76% for battery longevity; versus INA219AIDR, it delivers 33× lower supply draw and 10× higher bandwidth-making it the preferred choice for analog feedback loops in space- and power-constrained portable systems.
Availability
MAX4372FESA+ is available at Aetrix Electronics and suitable for notebook computer power management, smart-battery charger monitoring, and portable medical device power supervision requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4372FESA+ 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, computing, and portable applications.
The MAX4372 family was designed specifically for high-accuracy, micropower high-side current sensing in battery-powered systems-emphasizing supply independence, low offset, and minimal external components.
FAQ
What is the maximum common-mode voltage supported by MAX4372FESA+?
The MAX4372FESA+ supports a 0V to 28V input common-mode voltage range that is fully independent of its supply voltage. This allows the device to accurately monitor current in deeply discharged battery systems (down to 0V) and remain functional even when VRS+ exceeds VCC-a key capability confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does MAX4372FESA+ require external gain-setting resistors?
No, MAX4372FESA+ does not require external gain-setting resistors. It integrates a fixed 50V/V gain amplifier with voltage-output architecture, delivering a direct analog output proportional to the sense resistor voltage drop. This eliminates external feedback networks and reduces layout sensitivity-verified in the General Description and Functional Diagram sections of the datasheet.
What is the supply current consumption of MAX4372FESA+ at room temperature?
The MAX4372FESA+ consumes 30μA typical supply current at +25°C with VRS+ > 2V and VSENSE = 5mV, as specified in the Electrical Characteristics table. This micropower operation is maintained across the full 2.7V–28V supply range and supports always-on current monitoring in battery-critical applications without compromising runtime.
Can MAX4372FESA+ be used with a 2-cell Li-ion battery pack?
Yes, MAX4372FESA+ is explicitly qualified for use with 2-cell Li-ion battery packs. Its 0–28V common-mode range covers the full pack voltage (0–8.4V), including deep discharge states, and its supply voltage range (2.7V–28V) accommodates both battery and system rail operation-confirmed in the Applications section and Typical Operating Characteristics plots.
What is the output impedance of MAX4372FESA+ and why does it matter?
The MAX4372FESA+ has a guaranteed 1.5Ω output impedance, measured at VSENSE = 100mV. This low impedance ensures stable driving of ADC input capacitance and long PCB traces without signal degradation or phase shift-critical for maintaining accuracy in high-resolution current measurements and fast transient response in protection circuits.
MAX4372FESA+ 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:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 30µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 28 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4372FESA+ FAQ
1.How can I place an order for MAX4372FESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4372FESA+ 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 MAX4372FESA+ reliable?
The price and inventory of MAX4372FESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4372FESA+ is usually 5 days.
3.What payment methods are accepted for MAX4372FESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4372FESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4372FESA+?
MAX4372FESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4372FESA+ 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 MAX4372FESA+?
For technical support, including MAX4372FESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4372FESA+ requirements.
6.How does Aetrix verify that MAX4372FESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4372FESA+ 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 MAX4372FESA+ meets industry standards.
7.What is the process for return or replacement of MAX4372FESA+?
All MAX4372FESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4372FESA+, 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 MAX4372FESA+ part is unused and in its original packaging.
Return procedure for MAX4372FESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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