General Description

The MAX4069–MAX4072 low-cost, bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. They feature up to 24V input common-mode voltage range, low 100μA supply current (which drops to only 10μA in shutdown), and a total output error of less than 1.5. The wide 1.35V to 24V input common-mode range is independent of the supply voltage, ensuring that the current-sense feedback remains accurate even when connected to a battery pack in deep discharge.

Features

● Bidirectional, Compact, Current-Sense Solution

● Total Output Error Less than 1.5

● Selectable Gain of 50V/V or 100V/V

● Wide 1.35V to 24V Common-Mode Range

Independent of Supply Voltage

● 2.7V to 24V Single-Supply Operation

● Internal Precision Reference

? Adjustable (MAX4069)

? 2.50V (MAX4070)

? 1.50V (MAX4071)

● Low 100μA Supply Current

● 10μA Supply Current in Shutdown

● Available in Space-Saving Packages

? 8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)

? 8-Pin μMAX (MAX4070/MAX4071/MAX4072)

? 10-Pin μMAX (MAX4069)

Applications

● Notebook Fuel Gauging

● Smart-Battery Packs/Chargers

● Motor Control

● Power-Management Systems

● Cell-Phone Battery-Current Monitoring