36V, Input Common-Mode, High-Precision, Low-Power Current-Sense Amplifier

 

Part Number	Replacement	Explanation

Description

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The MAX44284 is a high-side, current-sense amplifier that operates with a 1.7V to 5.5V single supply and is optimized for very low power operation with only 21µA of quiescent current.

The MAX44284 offers precision accuracy specifications of 2µV VOS and gain error of 0.05%. The device features an input common-mode voltage range from -0.1V to +36V. This current-sense amplifier has a voltage output and is offered in four different gain versions.

The MAX44284 is offered in small 6-bump, 0.4mm-pitch WLP (1.3mm x 0.9mm) and 6-pin SOT23 packages and is specified for operation over the -40°C to +125°C automotive temperature range.

MAX44284: Typical Application Circuit Enlarge+

Key Features

• Supports Use of Small Current-Sense Resistors to Improve Power-Supply Conversion Efficiency and Measurement Accuracy
  • Input Bias Current of 80nA (max)
  • Very Low 2µV Input Offset Voltage (MAX44284F/H)
  • Extremely Low 50nV/°C Input Offset Tempco Coefficient
  • -0.1V to +36V Wide Input Common-Mode Range
  • Low 0.05% Gain Error
• Extends Battery Life
  • Low Supply Current of 21µA
  • 1.7V to 5.5V Single Supply
  • Shutdown Input (Independent of V_DD)
• Four Fixed Gain Options Simplify Design
  • 50V/V – MAX44284F
  • 100V/V – MAX44284H
  • 200V/V – MAX44284W
  • 500V/V – MAX44284E

Applications/Uses

• Base-Stations
• DC-DC Current Sensing in Power Management
• Medical Pulse Oximeters and Infusion Pumps
• Notebook Computers
• Portable-/Battery-Powered Systems
• Smartphones and Tablets