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Analog Devices Inc./Maxim Integrated MAX4373FEUA
- Part No.:
- MAX4373FEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4373FEUA.pdf
- Description:
- IC AMP COMP REF 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,911
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Product details
Overview
MAX4373FEUA from Maxim Integrated is a micropower, high-side current-sense amplifier with integrated comparator and 600mV bandgap reference, designed for overcurrent supervision in battery-powered systems. It delivers +50V/V gain, 1mV max input offset voltage, 2% full-scale accuracy, and operates from +2.7V to +28V supply while consuming only 50µA - enabling precise, low-power current monitoring in notebook computers and smart battery chargers.
For engineers reviewing the MAX4373FEUA datasheet, MAX4373FEUA pinout, MAX4373FEUA application, or MAX4373FEUA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the 8-pin µMAX package with +50V/V gain.
Technical Context
The MAX4373FEUA implements a single high-side current-sense amplifier with rail-to-rail common-mode input range (0V to +28V), independent of VCC, ensuring reliable operation during battery deep discharge. Its latching comparator uses an internal 600mV reference and responds to CIN1 voltage exceeding that threshold, eliminating oscillation during overcurrent events.
Unlike the MAX4374/MAX4375 variants, the MAX4373FEUA contains only one comparator and no second comparator input (CIN2) or output (COUT2). Its OUT pin provides a voltage output proportional to sense voltage (VSENSE = VRS+ − VRS−), eliminating external gain-setting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +50V/V - sets output voltage scaling for 100mV full-scale sense voltage; enables accurate detection of ~20mA load current with 5mΩ sense resistor |
| Input Offset Voltage | 1mV (max) - limits worst-case error to ±2% at 50mV sense input, critical for low-current precision |
| Supply Current | 50µA - extends battery life in portable systems; stable across +2.7V to +28V supply range |
| Common-Mode Range | 0V to +28V, supply-independent - supports monitoring of deeply discharged batteries without ground path interference |
| Full-Scale Accuracy | 2% (max) - includes combined gain and offset errors; validated over −40°C to +85°C operating temperature |
| Bandgap Reference | 600mV (±1.6%) - provides stable trip point for latching comparator; enables repeatable overcurrent threshold setting |
| Propagation Delay | 4µs - ensures fast response to overcurrent events; measured with 5mV overdrive and 10kΩ pull-up |
Pinout & Package
MAX4373FEUA is housed in an 8-pin µMAX® package (lead-free/RoHS-compliant), measuring 3mm × 3mm × 0.8mm, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts +2.7V to +28V; powers all internal blocks including amplifier, reference, and comparator |
| OUT (Pin 2) | Current-sense amplifier output | Voltage output = 50 × (VRS+ − VRS−); no external gain resistors required |
| CIN1 (Pin 3) | Comparator positive input | Connected to amplifier output; compared against internal 600mV reference to trigger latch |
| RESET (Pin 4) | Latch control input | Pull low ≥1.5µs to reset latched comparator output; must be held low until VCC ≥2.7V at power-up |
| GND (Pin 5) | Analog/digital ground | Reference for all internal circuitry; substrate tied to GND per chip information |
| RS− (Pin 6) | Sense resistor negative terminal | Low-side connection of external current-sense resistor; differential input with RS+ |
| RS+ (Pin 7) | Sense resistor positive terminal | High-side connection to load/battery; supports 0V to +28V common-mode voltage |
| COUT1 (Pin 8) | Latching comparator open-drain output | Drives low when CIN1 > 600mV; requires external pull-up (≤5V); remains latched until RESET pulse |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side sensing + comparator + reference | Reduces BOM count by eliminating discrete op-amp, reference, and comparator ICs plus associated passives |
| Voltage-output architecture | Removes need for gain-setting resistors and output buffer stages - simplifies layout and improves accuracy |
| Latching comparator with 600mV reference | Prevents oscillation during sustained overcurrent; eliminates need for external hysteresis or debounce circuitry |
| 0V to +28V supply-independent common-mode range | Enables monitoring of battery packs down to 0V without compromising accuracy or functionality |
| 50µA quiescent current | Supports multi-year battery life in always-on current-monitoring applications such as smart battery fuel gauging |
Applications
| Smart Battery Charger Supervision | Notebook Computer Power Path Monitoring |
|---|---|
Use Scenario: Real-time monitoring of charging current in Li-ion battery packs to prevent overcharge and thermal runaway. IC Role / Device Role / Timing Role: High-side current-sense amplifier feeds voltage output to system microcontroller ADC; latching comparator triggers immediate charger disable on fault. Use Value: 1mV max offset and 2% full-scale accuracy ensure ±20mA detection resolution at 1A charge current, improving safety margin compliance. | Use Scenario: Continuous measurement of CPU/GPU rail current during dynamic load changes to enable adaptive power management. IC Role / Device Role / Timing Role: Provides analog current feedback to PMIC or host controller; OUT pin directly interfaces with 12-bit ADC inputs. Use Value: 0V–28V common-mode range allows placement between battery and buck converter input, preserving ground integrity and avoiding noise coupling. |
| Portable Medical Device Load Protection | Industrial Handheld Meter Current Calibration |
Use Scenario: Overcurrent shutdown in battery-powered infusion pumps to halt motor drive upon occlusion detection. IC Role / Device Role / Timing Role: Comparator output drives gate driver enable/disable logic; latching behavior holds shutdown state until manual reset. Use Value: 4µs propagation delay ensures sub-10µs fault response, meeting IEC 60601-1 timing requirements for Class BF equipment. | Use Scenario: Precision current sourcing verification in handheld multimeters using shunt-based calibration loops. IC Role / Device Role / Timing Role: Amplifier output feeds precision DAC reference; stable 600mV bandgap enables traceable 0.1% current source accuracy. Use Value: ±1.6% reference accuracy and <1mV offset allow calibration against NIST-traceable standards without additional trimming components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier with comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4373TEUA+ | +20V/V gain (vs. +50V/V); same package, temp range, and core architecture | Better suited for higher full-scale sense voltages (e.g., 150mV) and larger sense resistors (>10mΩ) | Select when lower gain reduces sensitivity to PCB leakage or enables use of standard 1% tolerance sense resistors |
| MAX4373HEUA+ | +100V/V gain (vs. +50V/V); identical pinout and functional block diagram | Optimized for ultra-low current detection (<10mA) with 10mΩ or smaller sense resistors | Choose when maximizing signal-to-noise ratio is critical and board space allows tighter layout control for low-mV signals |
Compared with MAX4373TEUA+ and MAX4373HEUA+, the MAX4373FEUA offers balanced sensitivity for mid-range current monitoring (e.g., 50–500mA), delivering optimal trade-off between noise immunity, sense resistor power loss, and ADC resolution without requiring layout rework.
Availability
MAX4373FEUA is available at Aetrix Electronics and suitable for notebook computers, smart battery chargers, and portable medical devices requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4373FEUA 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 supervision in battery-critical systems, integrating amplifier, reference, and latch comparator to replace discrete solutions while maintaining micropower operation and wide common-mode range.
FAQ
What is the function of the RESET pin on the MAX4373FEUA?
The RESET pin controls the latching behavior of the internal comparator. When held high (>2.0V), the comparator output at COUT1 latches upon overcurrent detection and remains asserted until RESET is pulsed low for ≥1.5µs. During power-up, RESET must be held low until VCC reaches ≥2.7V to prevent false triggering. The MAX4373FEUA does not include internal power-on reset circuitry, so external RC timing or microcontroller control is required for reliable initialization.
Does the MAX4373FEUA support low-side current sensing?
Yes, the MAX4373FEUA can be used for low-side current sensing by connecting RS+ to the load side and RS− to ground. However, total output voltage error increases when VRS+ falls below 2V, as specified in the Electrical Characteristics table. For best accuracy in low-side configurations, keep VRS+ ≥2V. The device's 0V–28V common-mode range remains fully functional, but the amplifier's performance near 0V is de-rated per datasheet graphs (toc04–toc08).
What is the maximum sense resistor value supported by the MAX4373FEUA?
The maximum sense resistor value depends on full-scale load current and desired output swing. With +50V/V gain and 100mV full-scale sense voltage, RSENSE(max) = VSENSE(max) / ILOAD(max) = 100mV / ILOAD(max). For example, at 1A load, RSENSE ≤ 100mΩ. Higher values increase I²R heating and require careful thermal design. The MAX4373FEUA's 1mV input offset limits usable RSENSE to ≥5mΩ for reliable 20mA detection, assuming 100mV full-scale headroom.
Can the MAX4373FEUA operate with a 3.3V supply?
Yes, the MAX4373FEUA operates from +2.7V to +28V, making 3.3V fully compatible. At 3.3V supply, the OUT pin delivers up to 3.05V (VCC − 0.25V) for full-scale input, and COUT1 open-drain output supports pull-up to ≤5V. Supply current remains 50µA typical. Note that comparator trip point (600mV) and reference accuracy (±1.6%) are maintained across the full supply range, including 3.3V operation.
Is the MAX4373FEUA pin-compatible with other MAX4373 variants?
Yes, all MAX4373 variants (T/F/H suffixes) in the 8-pin µMAX package - including MAX4373TEUA+, MAX4373FEUA+, and MAX4373HEUA+ - share identical pinout, footprint, and electrical interface. Gain differences are implemented internally; no PCB changes are needed when substituting between them. This allows design flexibility during prototyping and production ramp without layout revision.
MAX4373FEUA 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:
- Obsolete
- Type:
- Amplifier, Comparator, Reference
- Applications:
- Current Sensing, Power Management
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4373FEUA FAQ
1.How can I place an order for MAX4373FEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4373FEUA 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 reliable?
The price and inventory of MAX4373FEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4373FEUA is usually 5 days.
3.What payment methods are accepted for MAX4373FEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4373FEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4373FEUA?
MAX4373FEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4373FEUA 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?
For technical support, including MAX4373FEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4373FEUA requirements.
6.How does Aetrix verify that MAX4373FEUA is sourced from the original manufacturer or authorized distributors?
All MAX4373FEUA 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 meets industry standards.
7.What is the process for return or replacement of MAX4373FEUA?
All MAX4373FEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4373FEUA, 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 part is unused and in its original packaging.
Return procedure for MAX4373FEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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