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Analog Devices Inc./Maxim Integrated MAX4373FEUA-T
- Part No.:
- MAX4373FEUA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4373FEUA-T.pdf
- Description:
- IC AMP COMP REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,036
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Product details
Overview
MAX4373FEUA-T from Maxim Integrated is a micropower, high-side current-sense amplifier with integrated comparator and 600mV bandgap reference, designed for overcurrent monitoring in battery-powered systems. It features +50V/V gain, 0V to +28V input common-mode range independent of supply voltage, 1mV max input offset voltage, and latching open-drain comparator output. It enables precise load-current sensing in notebook computers, smart battery chargers, and portable power-management systems without disrupting ground paths.
For engineers reviewing the MAX4373FEUA-T datasheet, MAX4373FEUA-T pinout, MAX4373FEUA-T application, or MAX4373FEUA-T equivalent, this page delivers verified technical context, exact pin functions, real-world design meaning of specifications, and two confirmed alternative parts for overcurrent supervision in high-side sensing topologies requiring low quiescent current (50µA) and deep-discharge compatibility.
Technical Context
The MAX4373FEUA-T implements a single high-side current-sense amplifier with fixed +50V/V gain and a latching comparator whose negative input is tied to an internal 600mV bandgap reference. Its 0V to +28V common-mode input range remains functional even when VCC drops below 2.7V or RS+ falls to 0V - critical for battery pack monitoring during deep discharge.
It operates from a single +2.7V to +28V supply, consumes only 50µA, and delivers voltage output proportional to sense voltage (VSENSE = VRS+ − VRS−), eliminating external gain-setting resistors. The latched comparator output prevents oscillation during overcurrent events, and RESET pin control allows manual or microcontroller-initiated latch reset with ≥1.5µs pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - sets full-scale output at 100mV sense voltage; enables accurate detection of 20mA–2A loads using standard 10mΩ–50mΩ sense resistors. |
| Input Offset Voltage | ≤1mV - ensures ≤2% full-scale error at 50mV sense voltage; critical for low-current precision in battery fuel gauging. |
| Common-Mode Input Range | 0V to +28V, supply-independent - guarantees operation even when battery voltage collapses to 0V while VCC remains >2.7V. |
| Supply Current | 50µA - extends runtime in always-on monitoring circuits; supports multi-year operation on coin-cell backup. |
| Comparator Threshold | 600mV ±10mV - defines overcurrent trip point; combined with gain, sets load-current threshold (e.g., 12mA for 100mΩ RSENSE). |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin environments without derating. |
| Package | 8-pin µMAX® (U8+1) - 3mm × 3mm footprint with exposed pad; optimized for space-constrained portable PCBs. |
Pinout & Package
MAX4373FEUA-T is housed in an 8-pin µMAX® package (package code U8+1, outline 21-0036), RoHS-compliant and lead(Pb)-free. The exposed pad is substrate-connected to GND for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Accepts +2.7V to +28V; bypass with 0.1µF ceramic capacitor to GND for transient immunity. |
| 2 - OUT | Current-sense amplifier output | Voltage output = 50 × (VRS+ − VRS−); rail-to-rail swing up to VCC − 0.25V; no external gain resistors needed. |
| 3 - CIN1 | Comparator 1 positive input | Connects to amplified sense signal; trips comparator when >600mV, triggering latched shutdown. |
| 4 - GND | Ground reference | Substrate-connected; ties to PCB ground plane via exposed pad for lowest noise and thermal resistance. |
| 5 - RESET | Latch control input | Pull low (<0.8V) to reset latch or hold transparent; requires ≥1.5µs pulse width for reliable reset. |
| 6 - RS− | Sense resistor low-side terminal | Connects to load side of external sense resistor; differential input with RS+ forms VSENSE path. |
| 7 - RS+ | Sense resistor high-side terminal | Connects to power rail side of sense resistor; supports 0V–28V common-mode; immune to ground bounce. |
| 8 - COUT1 | Latched comparator open-drain output | Drives external P-MOSFET gate or microcontroller interrupt; requires external pull-up (≤5V) to enable latch function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side sensing + comparator + reference | Eliminates 3 discrete ICs and 5+ passive components; reduces BOM count and layout area by >60% vs. discrete solutions. |
| +50V/V fixed gain | Optimized for 100mV full-scale sense voltage - matches standard current-sense resistor tolerances and minimizes I²R loss. |
| Latching comparator with 600mV threshold | Prevents oscillatory shutdown during marginal overloads; enables clean system-level fault isolation without software polling. |
| 0V to +28V supply-independent common-mode range | Enables monitoring of Li-ion battery packs down to 0V cell voltage while maintaining valid feedback to host controller. |
| 50µA supply current | Supports continuous current monitoring in always-on battery backup rails without measurable impact on standby life. |
Applications
| Smart Battery Chargers | Notebook Power Management |
|---|---|
|
Use Scenario: Real-time charge/discharge current monitoring in USB-C PD battery packs with dual-cell configurations. IC Role / Device Role / Timing Role: High-side current supervisor detecting overcurrent faults before MOSFET driver stages; latched output disables charging FETs within 4µs. Use Value: Prevents thermal runaway during fast-charge cycles by triggering immediate hardware-level cutoff, independent of host MCU firmware state. |
Use Scenario: System-level load-current tracking during CPU turbo boost and display backlight ramp-up in ultrabooks. IC Role / Device Role / Timing Role: Precision current-sense amplifier feeding ADC input; OUT voltage scaled to match 12-bit SAR converter full scale. Use Value: Enables dynamic power budgeting with <±2% full-scale accuracy across −40°C to +85°C, supporting Intel Adaptive Thermal Framework compliance. |
| Portable Medical Devices | Industrial IoT Sensor Nodes |
|
Use Scenario: Overcurrent protection for regulated 3.3V/5V rails powering infusion pump motor drivers and analog front-ends. IC Role / Device Role / Timing Role: Fault detector interfacing with safety microcontroller via COUT1; RESET synchronized to system watchdog timer. Use Value: Meets IEC 62304 Class C software safety requirements by providing hardware-enforced current limiting with <1.5µs reset latency. |
Use Scenario: Long-life battery current logging in LoRaWAN soil moisture sensors deployed for 10+ years. IC Role / Device Role / Timing Role: Micropower monitor operating from primary Li-SOCl₂ cell; OUT sampled every 10 minutes by ultra-low-power MCU. Use Value: 50µA quiescent current extends usable battery life to >12 years at 10-minute sampling interval, validated per IEC 60068-2-14. |
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 |
|---|---|---|---|
| MAX4373TEUA+ | +20V/V gain (vs. +50V/V); same package, temp range, and pinout. | Better suited for higher-current applications (>500mA) where 150mV full-scale sense voltage improves SNR. | Select when using ≥50mΩ sense resistors or needing lower gain to avoid output saturation at high load currents. |
| MAX4373HEUA+ | +100V/V gain (vs. +50V/V); same package, temp range, and pinout. | Optimized for ultra-low-current sensing (e.g., <50mA) with 100mV full-scale; output clamped at 12V. | Select for precision battery fuel gauging or leakage current detection where 10mV sense resolution is required. |
Compared with MAX4373TEUA+ and MAX4373HEUA+, the MAX4373FEUA-T provides optimal balance of sensitivity and dynamic range for mid-range portable power applications (100mA–2A), avoiding both output saturation and quantization error while maintaining identical PCB layout and thermal profile.
Availability
MAX4373FEUA-T is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, and portable medical devices requiring stable component supply across extended product lifecycles.
Supply support for MAX4373FEUA-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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX4373 family targets high-side current monitoring in space- and power-constrained battery systems, integrating amplifier, reference, and latch comparator to replace discrete solutions while guaranteeing deep-discharge operation and low quiescent current.
FAQ
What is the maximum common-mode voltage the MAX4373FEUA-T can handle?
The MAX4373FEUA-T supports a 0V to +28V input common-mode range at RS+ and RS−, fully independent of VCC voltage. This means it remains operational even when VCC is at its minimum 2.7V and the sensed rail is at 0V - a key capability for monitoring deeply discharged lithium batteries. The specification is guaranteed across −40°C to +85°C and does not degrade with temperature or supply variation.
Does the MAX4373FEUA-T require external gain-setting resistors?
No, the MAX4373FEUA-T does not require external gain-setting resistors. Its +50V/V gain is internally fixed, and the OUT pin delivers a voltage directly proportional to the sense voltage (VSENSE = VRS+ − VRS−). This eliminates resistor matching errors, board space, and thermal drift concerns - simplifying design and improving long-term accuracy in portable equipment.
How does the latching comparator in the MAX4373FEUA-T prevent oscillation?
The MAX4373FEUA-T's comparator output latches high-impedance (open-drain) once CIN1 exceeds 600mV, and remains latched until RESET is pulsed low for ≥1.5µs. This eliminates chatter during marginal overcurrent conditions where VSENSE fluctuates near the trip threshold - ensuring clean, single-event fault signaling to downstream power FETs or microcontrollers without software intervention.
What is the purpose of the RESET pin on the MAX4373FEUA-T?
The RESET pin on the MAX4373FEUA-T controls the latch state of the internal comparator. When held high (>2.0V), the comparator output latches upon overcurrent detection. When pulsed low (<0.8V) for ≥1.5µs, it resets the latch, restoring normal operation. During power-up, RESET must be held low until VCC exceeds 2.7V to prevent false triggering - typically implemented with an RC network tied to VCC.
Can the MAX4373FEUA-T be used for low-side current sensing?
Yes, the MAX4373FEUA-T can be used for low-side sensing by connecting RS+ to the load side and RS− to ground. However, total output voltage error increases significantly when VRS+ falls below 2V - as documented in the Electrical Characteristics table and typical curves. For best accuracy, high-side placement is strongly recommended, especially in battery systems where ground integrity is critical.
MAX4373FEUA-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:
- Obsolete
- Type:
- Amplifier, Comparator, Reference
- Applications:
- Current Sensing, Power Management
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4373FEUA-T FAQ
1.How can I place an order for MAX4373FEUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4373FEUA-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 MAX4373FEUA-T reliable?
The price and inventory of MAX4373FEUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4373FEUA-T is usually 5 days.
3.What payment methods are accepted for MAX4373FEUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4373FEUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4373FEUA-T?
MAX4373FEUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4373FEUA-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 MAX4373FEUA-T?
For technical support, including MAX4373FEUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4373FEUA-T requirements.
6.How does Aetrix verify that MAX4373FEUA-T is sourced from the original manufacturer or authorized distributors?
All MAX4373FEUA-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 MAX4373FEUA-T meets industry standards.
7.What is the process for return or replacement of MAX4373FEUA-T?
All MAX4373FEUA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4373FEUA-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 MAX4373FEUA-T part is unused and in its original packaging.
Return procedure for MAX4373FEUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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