Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier

 

Part Number	Replacement	Explanation

Description

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The MAX4073 low-cost, high-side current-sense amplifier features a voltage output that eliminates the need for gain-setting resistors making it ideal for cell phones, notebook computers, PDAs, and other systems where current monitoring is crucial. High-side current monitoring does not interfere with the ground path of the battery charger making the MAX4073 particularly useful in battery-powered systems. The input common-mode range of +2V to +28V is independent of the supply voltage. The MAX4073's wide 1.8MHz bandwidth makes it suitable for use inside battery-charger control loops.

The combination of three gain versions and a selectable external-sense resistor sets the full-scale current reading. The MAX4073 offers a high level of integration, resulting in a simple and compact current-sense solution.

The MAX4073 operates from a +3V to +28V single supply and draws only 0.5mA of supply current. This device is specified over the automotive operating temperature range (-40°C to +125°C) and is available in a space-saving 5-pin SC70 package (half the size of the SOT23).

For a similar device in a 6-pin SOT23 with a wider common-mode voltage range (0 to +28V), see the MAX4173 data sheet.

MAX4073F, MAX4073H, MAX4073T: Typical Operating Circuit Enlarge+

Key Features

• Low-Cost, Compact, Current-Sense Solution
• Three Gain Versions Available
  • +20V/V (MAX4073T)
  • +50V/V (MAX4073F)
  • +100V/V (MAX4073H)
• ±1.0% Full-Scale Accuracy
• 500µA Supply Current
• Wide 1.8MHz Bandwidth
• +3V to +28V Operating Supply
• Wide +2V to +28V Common-Mode Range Independent of Supply Voltage
• Automotive Temperature Range (-40°C to +125°C)
• Available in Space-Saving 5-Pin SC70 Package