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Analog Devices Inc./Maxim Integrated MAX4373HESA
- Part No.:
- MAX4373HESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4373HESA.pdf
- Description:
- IC AMP COMP REF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,931
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Product details
Overview
MAX4373HESA 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 +100V/V gain, 1mV max input offset voltage, 2% max full-scale accuracy, and operates from +2.7V to +28V supply while consuming only 50µA. It enables precise load-current monitoring in notebook computers and smart battery chargers without disrupting ground paths.
For engineers reviewing the MAX4373HESA datasheet, MAX4373HESA pinout, MAX4373HESA application, or MAX4373HESA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across 0V–28V common-mode range, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The MAX4373HESA implements a single high-side current-sense amplifier with rail-to-rail input common-mode range (0V to +28V, independent of VCC), enabling accurate sensing during battery deep discharge. Its latching open-drain comparator uses an internal 600mV reference and responds to voltage at CIN1, eliminating oscillation during overcurrent events.
Unlike the MAX4374/MAX4375, the MAX4373HESA contains only one comparator and no second comparator input (CIN2) or output (COUT2). It supports reset via the RESET pin to clear the latch, with propagation delay under 4µs and saturation recovery time of 0.1ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +100V/V - sets output voltage scaling for 100mV full-scale sense voltage, enabling high-resolution current detection with small sense resistors |
| Input Offset Voltage | 1mV (max) - ensures minimal error in low-current sensing applications such as standby power monitoring |
| Full-Scale Accuracy | 2% (max) - guarantees reliable trip-point consistency across temperature and supply variations in protection circuits |
| Supply Current | 50µA - extends battery life in portable systems without compromising response speed or accuracy |
| Common-Mode Range | 0V to +28V, independent of VCC - maintains functionality even when battery voltage drops below regulator output or exceeds supply rail |
| Comparator Threshold | 600mV ±10mV - fixed internal reference enables consistent overcurrent detection without external components |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive-adjacent embedded power management environments |
Pinout & Package
MAX4373HESA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead(Pb)-free. Pin assignments are validated per Maxim's official datasheet (Rev 5, May 2015), Figure 1 and Pin Configurations on page 12.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense resistor positive terminal | Connects to battery/load side of external sense resistor; accepts up to +28V common-mode voltage |
| 2 RS- | High-side sense resistor negative terminal | Connects to power supply side of sense resistor; differential input with RS+ defines VSENSE = (RS+ − RS−) |
| 3 OUT | Current-sense amplifier output | Voltage output proportional to VSENSE × 100; clamped at 12V max; drives ADC or analog monitoring circuitry |
| 4 CIN1 | Comparator 1 positive input | Accepts amplified VSENSE; comparator triggers when voltage exceeds internal 600mV reference |
| 5 GND | Analog ground reference | Return path for internal bandgap reference and amplifier biasing; must be low-impedance connection |
| 6 RESET | Latch control input | Active-high logic input: >2.0V enables latching, <0.8V resets latch or makes comparator transparent |
| 7 VCC | Power supply input | Single supply rail (+2.7V to +28V); powers all internal blocks including reference and comparator |
| 8 COUT1 | Latched open-drain comparator output | Drives external MOSFET gate or microcontroller interrupt; requires external pull-up (≤5V) to enable logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bandgap reference | ±1.6% accuracy 600mV reference eliminates need for external precision voltage source in overcurrent threshold setting |
| Latching comparator output | Prevents oscillation during sustained overcurrent, enabling clean shutdown without external debounce or hysteresis circuitry |
| Voltage-output amplifier | Eliminates gain-setting resistors-reduces BOM count and layout area while improving accuracy vs. current-output alternatives |
| 0V–28V common-mode range | Ensures operation during battery deep discharge (e.g., Li-ion down to 2.5V) without loss of sensing capability or accuracy degradation |
| 50µA supply current | Enables always-on current monitoring in ultra-low-power systems such as IoT edge nodes and backup battery supervisors |
Applications
| Smart Battery Chargers | Notebook Computer Power Rails |
|---|---|
|
Use Scenario: Real-time monitoring of charge/discharge current in Li-ion battery packs with integrated fuel gauging. IC Role / Device Role / Timing Role: High-side current supervisor detecting overcurrent faults and triggering charger disable via latched COUT1 signal. Use Value: Prevents thermal runaway by halting charging within 4µs of fault detection, while maintaining accuracy down to 0V battery voltage. |
Use Scenario: Monitoring 5V/12V system rails for short-circuit or overload conditions during active CPU/GPU operation. IC Role / Device Role / Timing Role: Current-sense amplifier feeding analog-to-digital converter (ADC) input, with comparator providing hardware-level fault flag. Use Value: Enables dual-path monitoring-precision analog feedback for dynamic power budgeting and fast digital fault response without software latency. |
| Portable Medical Devices | Industrial Sensor Node Power Management |
|
Use Scenario: Supervising current draw of portable ultrasound or glucose meter during battery-powered operation. IC Role / Device Role / Timing Role: High-side monitor ensuring compliance with IEC 60601 leakage limits and triggering safe shutdown on abnormal load. Use Value: Maintains isolation between patient-connected circuitry and battery ground, avoiding safety-ground interference in Class II devices. |
Use Scenario: Long-life remote sensor nodes powered by primary lithium cells requiring decades of unattended operation. IC Role / Device Role / Timing Role: Micropower current supervisor logging baseline consumption and flagging end-of-life battery impedance rise. Use Value: 50µA quiescent current allows continuous monitoring for >10 years on a single CR123A cell, with no calibration drift over temperature. |
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 |
|---|---|---|---|
| MAX4373TESA+ | +20V/V gain (vs. +100V/V); identical 8-pin SO package, same pinout, same temperature range and supply range | Better suited for higher-current applications where 150mV full-scale sense voltage is preferred over 100mV | Select when lower gain enables use of larger, more stable, lower-cost sense resistors and reduces sensitivity to PCB layout parasitics |
| MAX4373FEUA+ | +50V/V gain; 8-pin µMAX package (3mm × 3mm) instead of SO; same electrical specs otherwise | Preferred for space-constrained designs where board area is critical and thermal performance permits smaller footprint | Choose for compact portable electronics where 8-pin SO is too large but µMAX reflow compatibility and test access are acceptable |
Compared with MAX4373TESA+ and MAX4373FEUA+, the MAX4373HESA offers highest gain for ultra-low-current sensing, occupies standard SO footprint for ease of assembly and test, and delivers identical accuracy and temperature stability-making it optimal for precision battery protection where resolution matters most.
Availability
MAX4373HESA is available at Aetrix Electronics and suitable for smart battery chargers, notebook computer power rails, portable medical devices, and industrial sensor node power management requiring stable component supply and long-term lifecycle support.
Supply support for MAX4373HESA 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 analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX4373 family was designed specifically for high-side current monitoring in battery-powered systems, integrating amplifier, reference, and latchable comparator to replace multi-component discrete solutions in space- and power-constrained designs.
FAQ
What is the maximum common-mode voltage supported by the MAX4373HESA?
The MAX4373HESA supports a 0V to +28V input common-mode range at RS+ and RS−, independent of the VCC supply voltage. This allows the MAX4373HESA to remain fully functional even when monitoring battery voltages that fall below the system supply rail or exceed it-critical for deep-discharge detection in Li-ion and multi-cell packs.
Does the MAX4373HESA include an internal voltage reference, and what is its accuracy?
Yes, the MAX4373HESA integrates a precision bandgap reference with ±1.6% accuracy over -40°C to +85°C. This 600mV reference serves both the comparator threshold and internal biasing, eliminating the need for external reference components and ensuring stable overcurrent trip points across temperature and supply variations.
Can the MAX4373HESA be used for low-side current sensing?
While the MAX4373HESA is optimized for high-side sensing, it can be used for low-side configurations. However, total output voltage error increases significantly when RS+ falls below 2V, as documented in the Electrical Characteristics table. For best accuracy in low-side applications, consider dedicated low-side amplifiers or verify error budget against system requirements.
What is the function of the RESET pin on the MAX4373HESA?
The RESET pin controls the latching behavior of the internal comparator. When held high (>2.0V), the MAX4373HESA latches COUT1 upon overcurrent detection and holds it until RESET is pulsed low (<0.8V) for ≥1.5µs. Holding RESET low makes the comparator transparent-allowing real-time monitoring without latching-enabling flexible fault-handling strategies in firmware-controlled systems.
Is the MAX4373HESA pin-compatible with other variants in the MAX4373 family?
Yes, all 8-pin SO variants-including MAX4373TESA+, MAX4373FESA+, and MAX4373HESA+-share identical pinout, package dimensions, and footprint. Gain differences (+20V/V, +50V/V, +100V/V) are the sole functional distinction; no PCB redesign is required when substituting between them, provided the application's full-scale sense voltage and output range remain compatible.
MAX4373HESA 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:
- Obsolete
- Type:
- Amplifier, Comparator, Reference
- Applications:
- Current Sensing, Power Management
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
MAX4373HESA FAQ
1.How can I place an order for MAX4373HESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4373HESA 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 MAX4373HESA reliable?
The price and inventory of MAX4373HESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4373HESA is usually 5 days.
3.What payment methods are accepted for MAX4373HESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4373HESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4373HESA?
MAX4373HESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4373HESA 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 MAX4373HESA?
For technical support, including MAX4373HESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4373HESA requirements.
6.How does Aetrix verify that MAX4373HESA is sourced from the original manufacturer or authorized distributors?
All MAX4373HESA 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 MAX4373HESA meets industry standards.
7.What is the process for return or replacement of MAX4373HESA?
All MAX4373HESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4373HESA, 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 MAX4373HESA part is unused and in its original packaging.
Return procedure for MAX4373HESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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