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MAX471

Maxim
Part Number MAX471
Manufacturer Maxim
Description Precision / High-Side Current-Sense Amplifiers
Published Apr 29, 2005
Detailed Description 19-0335; Rev 2; 12/96 Precision, High-Side Current-Sense Amplifiers _______________General Description The MAX471/MAX47...
Datasheet PDF File MAX471 PDF File

MAX471
MAX471

Overview
19-0335; Rev 2; 12/96 Precision, High-Side Current-Sense Amplifiers _______________General Description The MAX471/MAX472 are complete, bidirectional, highside current-sense amplifiers for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical.
High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the ground paths of the battery chargers or monitors often found in “smart” batteries.
The MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A.
For applications requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-setting resistors.
Both devices have a current output that can be converted to a ground-referred voltage with a single resistor, allowing a wide range of battery voltages and currents.
An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged.
Both devices operate from 3V to 36V, draw less than 100µA over temperature, and include a 18µA max shutdown mode.
____________________________Features o Complete High-Side Current Sensing o Precision Internal Sense Resistor (MAX471) o 2% Accuracy Over Temperature o Monitors Both Charge and Discharge o 3A Sense Capability with Internal Sense Resistor (MAX471) o Higher Current-Sense Capability with External Sense Resistor (MAX472) o 100µA Max Supply Current o 18µA Max Shutdown Mode o 3V to 36V Supply Operation o 8-Pin DIP/SO Packages MAX471/MAX472 ______________Ordering Information PART MAX471CPA MAX471CSA MAX471EPA MAX471ESA MAX472CPA MAX472CSA MAX472EPA MAX472ESA TEMP.
RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO ________________________Applications Portable PCs: Notebooks/Subnotebooks/Palmtops Smart ...


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