Application. Notebook Computers
. Current-Limited Power
. Supplies
. Fuel Gauges in PC
. General-System/Board-
. Level Current Monitoring
. Battery Chargers
. Portable/Battery-Powered
. Systems
. Cell Phones
. Smart Battery Packages
. Automotive Current Detect
. Power Management
. Systems
. PA Bias ControlPinout
SpecificationsVCC, RS+, RS- to GND .......................................-0.3V to +30V
OUT to GND ...........................................-0.3V to (VCC + 0.3V)
Differential Input Voltage (VRS+ - VRS- )..........................±8V
Output Short Circuit to VCC..................................Continuous
Output Short Circuit to GND ...............................................1s
Current into Any Pin.....................................................±20mA
Continuous Power Dissipation (TA = +70°C)
5-pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
8-pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-pin SO (derate 5.88mW/°C above +70°C)................471mW
14-pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW
Operating Temperature Range ....................-40°C to +125°C
Junction Temperature.................................................+150°C
Storage Temperature Range .......................-65°C to +150°C
Lead Temperature (soldering, 10s) ...........................+300°CDescriptionThe MAX4376/MAX4377/MAX4378 single, dual, and quad precision high-side current-sense amplifiers are available in space-saving packages. They feature buffered voltage outputs that eliminate the need for gain-setting resistors and are ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. These precision devices are offered in three fixed-gain versions of 20, 50, and 100:GAIN SUFFIX 20T 50 F 100 H For example, MAX4376TAUK is a single high-side amplifier with a gain of 20.
High-side current monitoring MAX4378 is especially useful in battery- powered systems since it does not interfere with the ground path of the battery charger. The input common- mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery pack in deep discharge.
The full-scale current reading of MAX4378 can be set by choosing the appropriate voltage gain and external-sense resistor. This capability offers a high level of integration and flexibility, resulting in a simple and compact currentsense solution.
The MAX4376/MAX4377/MAX4378 operate over a supply voltage range of +3V to +28V, draw 1mA of supply current per amplifier, and operate over the full automotive temperature range of -40°C to +125°C. These devices have a wide bandwidth of 2MHz, making them suitable for use inside battery-charger control loops. The buffered outputs drive up to 2mA of output current into a ground-referenced load.
The MAX4376 is available in a tiny 5-pin SOT23 package. The MAX4377/MAX4378 are available in spacesaving 8-pin µMAX and 14-pin TSSOP packages,respectively.
MAX4378 Data Sheet
