高精度、ハイサイド電流検出アンプ

 

型番	Replacement	Explanation

説明

EE-Sim^®を使って設計とシミュレーションを行う:

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.

MAX471、MAX472：標準動作回路 拡大表示+

主な特長

• 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

アプリケーション/用途

• バッテリ駆動アプリケーション
• 携帯電話
• エネルギー管理
• ポータブルPC：ノートブック、サブノートブック、パームトップ
• ポータブル電話
• ポータブル試験/測定システム
• スマートバッテリパック/充電器