MAX4374
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
Simplify Current Monitoring/Protection with One Tiny 10-Pin Package
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Overview
Features and Benefits
- Integrated Current-Sensing Solution Simplifies High-Side Current Monitoring
- Current-Sense Amplifier plus Internal Comparator and Bandgap Reference with Improved Accuracy
- 1mV (max) Input Offset Voltage
- 2% (max) Full-Scale Accuracy
- Internal Bandgap Reference (±1.6% Accuracy)
- High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage Ensures Current Monitoring Even In Deep Discharge of Battery Pack
- Low Power Consumption Extends Battery Life
- 50µA Supply Current
- Single +2.7V to +28V Operating Supply
- Latching Comparator Output Eliminates Oscillation
- Three Gain Versions (+20V/V, +50V/V, +100V/V) Support Different Size Battery Packs
Product Details
The MAX4373/MAX4374/MAX4375 low-cost, micropower, high-side current-sense supervisors contain a high-side current-sense amplifier, bandgap reference, and comparator with latching output. They feature a voltage output that eliminates the need for gain-setting resistors, making them ideal for today's notebook computers, cell phones, and other systems where battery/DC current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The 0 to +28V input common-mode range is independent of the supply voltage, which ensures that the current-sense feedback remains viable even when connected to a battery pack in deep discharge.
The comparator output of the MAX4373/MAX4374/ MAX4375 is latched to provide a turn-off flag that doesn't oscillate. In addition, the MAX4374/MAX4375 contain a second comparator for use in window-detection functions. The MAX4373/MAX4374/MAX4375 are available in three different gain versions (T = +20V/V, F = +50V/V, H = +100V/V) and use an external sense resistor to set the sensitivity of the input voltage to the load current. These features offer a high level of integration, resulting in a simple and compact current-sense solution.
The MAX4373/MAX4374/MAX4375 operate from a single +2.7V to +28V supply and consume 50µA. They are specified for the extended operating temperature range (-40°C to +85°C) and are available in 8-pin and 10-pin µMAX® packages.
Applications
- Cell Phones
- General-System/Board-Level Current Monitoring
- Notebook Computers
- Portable Battery-Powered Systems
- Power-Management Systems
- Precision Current Sources
- Smart Battery Packs/Chargers
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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How to Accurately Calculate Overcurrent in High-Side Current-Sense Amplifiers8/28/2017
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DC Error Budget Calculator Simplifies Selection of Optimal Current-Sense Amplifiers4/9/2013
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Performance of Current-Sense Amplifiers with Input Series Resistors1/3/2007
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High-Side Current Sensor Has Period Output5/31/2002
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High-Side Current-Sense Measurement: Circuits and Principles11/19/2001
Tools & Simulations
SPICE Models
Product Recommendations
MAX4374 Companion Parts
Design Resources
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.