The MAX4373/MAX4374/MAX4375FEUB+T 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/ MAX4375FEUB+T is latched to provide a turn-off flag that doesn't oscillate. In addition, the MAX4374/MAX4375FEUB+T contain a second comparator for use in window-detection functions. The MAX4373/MAX4374/MAX4375FEUB+T 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/MAX4375FEUB+T 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.
Feature
- 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
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
