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Analog Devices Inc./Maxim Integrated MAX4374HESD+
- Part No.:
- MAX4374HESD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Amplifiers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4374HESD+.pdf
- Description:
- IC AMP COMP REF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
MAX4374HESD+ from Maxim Integrated is a micropower, high-side current-sense amplifier with integrated latching comparator and 600mV bandgap reference, designed for overcurrent monitoring in battery-powered systems. It features +100V/V gain, 0V to +28V input common-mode range independent of supply, 1mV max input offset voltage, and 50µA supply current. Used in smart battery chargers to detect load overcurrent without disrupting ground paths.
For engineers reviewing the MAX4374HESD+ datasheet, MAX4374HESD+ pinout, MAX4374HESD+ application, or MAX4374HESD+ equivalent, this page delivers verified specifications, package mapping, functional pin roles, real-world use cases, and validated alternative options for high-side current supervision in portable power systems.
Technical Context
The MAX4374HESD+ implements a precision current-sense amplifier with rail-to-rail common-mode operation down to 0V, enabling reliable monitoring during deep battery discharge. Its internal 600mV reference feeds two comparators: one latched (CIN1 → COUT1) for overcurrent flagging, and a second (CIN2 ↔ COUT2) supporting window detection configurations.
It operates from a single +2.7V to +28V supply and uses an external sense resistor to set sensitivity. The +100V/V gain version targets low-current applications where full-scale sense voltage is 100mV, and output is internally clamped at 12V to prevent overvoltage stress on downstream logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | +100V/V - sets output voltage = 100 × sense voltage; enables 100mV full-scale sensing for high-resolution low-current detection |
| Input Offset Voltage | 1mV (max) - ensures <±0.1% error at 100mV sense input, critical for precision battery charge termination |
| Common-Mode Range | 0V to +28V, supply-independent - maintains functionality even when battery voltage drops below VCC or exceeds supply |
| Supply Current | 50µA - extends runtime in always-on monitoring circuits such as smart battery fuel gauges |
| Comparator Threshold | 600mV ±10mV - fixed internal reference enables consistent overcurrent trip point across temperature and supply variation |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive cabin-temperature embedded power management |
| Output Clamping | 12V max - protects 5V logic interfaces when used with higher VCC supplies up to +28V |
Pinout & Package
MAX4374HESD+ is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with exposed pad, RoHS-compliant and lead-free. Pin assignments are fully defined in Maxim's official datasheet Rev 5 (May 2015), with no NC pins internally connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 | Physical package terminals | Standard 14-pin SOIC footprint; pin 1 marked by notch/dot; thermal pad (EP) electrically tied to GND for improved power dissipation |
| RS+ | High-side sense input positive | Connects to battery/load side of external sense resistor; supports up to +28V common-mode voltage |
| RS- | High-side sense input negative | Connects to power supply side of sense resistor; differential input limited to ±0.3V |
| OUT | Current-sense amplifier output | Voltage output = 100 × (RS+ − RS−); clamped at 12V; drives ADC or analog monitoring circuitry |
| CIN1 | Latched comparator positive input | Monitors amplified sense voltage; trips COUT1 when >600mV; latch reset via RESET pin |
| CIN2 | Second comparator input | Configurable as high/low threshold input for window detection (MAX4374/MAX4375 function) |
| COUT1 | Latched open-drain comparator output | Drives external MOSFET gate or microcontroller interrupt; remains latched until RESET pulse |
| COUT2 | Unlatched open-drain comparator output | Provides real-time window detection status; no internal latch; requires external pull-up |
| RESET | Latch control input | Pulse low ≥1.5µs to reset COUT1; hold low to make comparator transparent |
| VCC | Power supply input | Single +2.7V to +28V supply; bypass with 0.1µF ceramic capacitor to GND |
| GND | Analog and digital ground | Reference for all internal circuitry; connects to thermal pad (EP) for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bandgap reference | 600mV ±10mV accuracy over -40°C to +85°C - eliminates need for external reference and reduces BOM count in overcurrent protection circuits |
| Latching comparator output | COUT1 remains asserted after overcurrent event until explicit RESET - prevents oscillation in power-switching feedback loops |
| Supply-independent common-mode range | 0V to +28V operation regardless of VCC level - enables monitoring of deeply discharged batteries (e.g., Li-ion <2.5V) while powered from +5V rail |
| Three factory-set gain options | +100V/V variant (H-grade) optimized for 10–100mV sense ranges - improves signal-to-noise ratio in low-current battery monitoring |
| Low quiescent current | 50µA typical - allows continuous current monitoring in energy-sensitive applications like IoT sensor nodes and wearable health monitors |
Applications
| Smart Battery Chargers | Portable Medical Devices |
|---|---|
Use Scenario: Real-time load current monitoring during Li-ion charging cycles to detect abnormal draw or cell imbalance. IC Role / Device Role / Timing Role: High-side current-sense amplifier provides isolated feedback to charger controller; latched comparator triggers immediate shutdown on overcurrent. Use Value: Prevents thermal runaway by cutting power within microseconds of fault detection, using only 50µA quiescent current during standby. | Use Scenario: Monitoring battery discharge current in handheld ECG or glucose meters to estimate remaining runtime and warn before shutdown. IC Role / Device Role / Timing Role: Amplifies mV-level sense voltage across shunt; +100V/V gain delivers measurable 1–5V output for low-resolution MCU ADCs. Use Value: Enables accurate fuel-gauge estimation with <1% full-scale error, extending usable battery life through precise low-current tracking. |
| Industrial Power Supplies | Automotive Body Control Modules |
Use Scenario: Overcurrent supervision of 12V/24V DC distribution rails feeding multiple subsystems in factory automation equipment. IC Role / Device Role / Timing Role: Acts as primary current supervisor; COUT1 drives solid-state relay driver; RESET synchronized to system watchdog timer. Use Value: Eliminates need for discrete op-amp + comparator + reference IC stack, reducing PCB area by >40% and improving long-term drift stability. | Use Scenario: Monitoring current draw of LED lighting arrays or window motor drivers in vehicle door modules. IC Role / Device Role / Timing Role: High-side sensing avoids ground path interference; dual comparators support both overcurrent and undervoltage (window) detection. Use Value: Detects short-circuit faults before fuse blow, enabling diagnostic logging and graceful fail-safe response per ISO 16750-2 requirements. |
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 |
|---|---|---|---|
| MAX4375HESD+ | +100V/V gain, same 14-pin SOIC package, but includes second comparator configured for low-threshold window detection (CIN2 = negative input) | Supports asymmetric window detection (e.g., undercurrent alarm + overcurrent shutdown) without external components | Select MAX4375HESD+ if dual-threshold behavior is required; otherwise MAX4374HESD+ offers simpler configuration for single-trip overcurrent protection |
| INA219AIDR | I²C digital output, integrated 12-bit ADC, 0.1% gain error, but 1mA supply current and no latching comparator | Suitable for systems requiring digital telemetry and programmable thresholds, not hardwired fault shutdown | Choose INA219AIDR when host MCU can process I²C data and manage fault response in firmware; MAX4374HESD+ preferred for autonomous, analog-triggered protection |
Compared with MAX4375HESD+, the MAX4374HESD+ provides identical gain and package but differs in CIN2 polarity for window detection; versus INA219AIDR, it trades digital flexibility for ultra-low power and deterministic hardware-level latching - critical for safety-critical overcurrent cutoff.
Availability
MAX4374HESD+ is available at Aetrix Electronics and suitable for smart battery chargers, portable medical devices, industrial power supplies, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for MAX4374HESD+ 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 management, sensing, and interface applications, with emphasis on reliability and integration for demanding embedded environments.
The MAX4373/MAX4374/MAX4375 family was engineered specifically for high-side current supervision in space-constrained, battery-sensitive systems - delivering amplifier, reference, and comparator functions in one micropower device to replace multi-component solutions.
FAQ
What is the maximum common-mode voltage supported by the MAX4374HESD+?
The MAX4374HESD+ supports a 0V to +28V input common-mode range at RS+ and RS−, independent of the VCC supply voltage. This allows the device to monitor current in deeply discharged batteries (e.g., Li-ion at 1.8V) while operating from a separate +5V rail, ensuring uninterrupted supervision during brownout conditions. The specification is guaranteed across the full -40°C to +85°C temperature range.
Does the MAX4374HESD+ require external gain-setting resistors?
No, the MAX4374HESD+ does not require external gain-setting resistors. Its +100V/V gain is factory-trimmed and internally fixed. The output voltage is directly proportional to the differential sense voltage (VSENSE = VRS+ − VRS−), eliminating resistor tolerance errors and layout sensitivity. This simplifies design and improves long-term accuracy compared to discrete amplifier implementations.
How does the latching comparator in the MAX4374HESD+ behave during an overcurrent event?
When the voltage at CIN1 exceeds 600mV (the internal bandgap reference), the latched comparator asserts COUT1 in open-drain mode and holds that state indefinitely. The latch remains active even if the overcurrent condition clears, preventing oscillation in power-switching loops. To reset, a ≥1.5µs low pulse must be applied to the RESET pin. This behavior is intrinsic to the MAX4374HESD+ and requires no external timing components.
Can the MAX4374HESD+ be used for low-side current sensing?
Yes, the MAX4374HESD+ 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 significantly when VRS+ falls below 2V, as documented in the Electrical Characteristics table. For optimal accuracy in low-side configurations, ensure VRS+ remains ≥2V - making it less ideal than dedicated low-side amplifiers but viable in constrained layouts where high-side placement is impractical.
What is the purpose of the CIN2 and COUT2 pins on the MAX4374HESD+?
On the MAX4374HESD+, CIN2 serves as the positive input of a second open-drain comparator whose negative input is tied to the internal 600mV reference. COUT2 provides its unlatched output. This enables window detection when paired with COUT1 - for example, using COUT1 for overcurrent and COUT2 for undercurrent flags. Unlike the latched COUT1, COUT2 responds immediately to input changes, supporting real-time status monitoring without software intervention.
MAX4374HESD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Amplifier, Comparator, Reference
- Applications:
- Current Sensing, Power Management
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-SOIC
MAX4374HESD+ FAQ
1.How can I place an order for MAX4374HESD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4374HESD+ 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 MAX4374HESD+ reliable?
The price and inventory of MAX4374HESD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4374HESD+ is usually 5 days.
3.What payment methods are accepted for MAX4374HESD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4374HESD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4374HESD+?
MAX4374HESD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4374HESD+ 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 MAX4374HESD+?
For technical support, including MAX4374HESD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4374HESD+ requirements.
6.How does Aetrix verify that MAX4374HESD+ is sourced from the original manufacturer or authorized distributors?
All MAX4374HESD+ 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 MAX4374HESD+ meets industry standards.
7.What is the process for return or replacement of MAX4374HESD+?
All MAX4374HESD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4374HESD+, 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 MAX4374HESD+ part is unused and in its original packaging.
Return procedure for MAX4374HESD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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