MAX4373TESA+T Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs

General Description

The MAX4373/MAX4374/MAX4375 low-cost, micropower, high-side current-sense supervisors contain a highside 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 currentsense 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

Notebook Computers

Portable/Battery-Powered Systems

Smart Battery Packs/Chargers

Cell Phones

Power-Management Systems

General-System/Board-Level Current Monitoring

Precision Current Sources

Features

Current-Sense Amplifier plus Internal Comparator and Bandgap Reference

50µA Supply Current

Single +2.7V to +28V Operating Supply

0.66% Full-Scale Accuracy

Internal Bandgap Reference

Latching Comparator Output

Three Gain Versions Available (+20V/V, +50V/V, +100V/V)

Wide 0 to +28V Common-Mode Range, Independent of Supply Voltage

Ordering Information

ABSOLUTE MAXIMUM RATINGS

VCC, RS+, RS- to GND ...........................................-0.3V to +30V

OUT to GND ................................................-0.3V to the lesser of (VCC + 0.3V) or +15V

CIN1, CIN2, RESET to GND ........................-0.3V to the lesser of (VCC + 0.3V) or +12V

Differential Input Voltage (VRS+ - VRS-)..............................±0.3V

COUT1, COUT2 to GND........................................-0.3V to +6.0V

Current into Any Pin..........................................................±10mA

Continuous Power Dissipation (T A = +70°C)

8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW

14-Pin SO (derate 8.3mW/°C above +70°C)................667mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VCC = +2.7V to +28V, VRS+ = 0 to +28V, VSENSE = 0, VRESET = 0, RLOAD= 1M Ω, T A = TMIN to TMAX, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)

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