描述 Description

The MAX471/MAX472 are complete, bidirectional, high-side 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.

特性 Features

? Complete High-Side Current Sensing
? Precision Internal Sense Resistor (MAX471)
? 2% Accuracy Over Temperature
? Monitors Both Charge and Discharge
? 3A Sense Capability with Internal Sense Resistor (MAX471)
? Higher Current-Sense Capability with External Sense Resistor (MAX472)
? 100μA Max Supply Current
? 18μA Max Shutdown Mode
? 3V to 36V Supply Operation
? 8-Pin DIP/SO Packages

應用 Application

? 電池供電應用
? 蜂窩電話
? 能量管理
? 便攜式PC：筆記本電腦、亞筆記本電腦、掌上電腦
? 便攜電話
? 便攜式測試/測量系統(tǒng)
? 智能電池組/充電器

簡介

MAX471屬于集成電路（IC）的模擬開關多路復用器解復用器。由制造生產(chǎn)的MAX471模擬開關，多路復用器，解復用器該系列產(chǎn)品可用于在多個可用信號路徑之間互連或路由模擬信號。功能類似于傳統(tǒng)的機電開關，但與機電開關相比，它們的固態(tài)特性有利于電子控制、延長使用壽命及降低開關噪聲，但作為代價，切換信號的幅度和偏壓限制有所增加。