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MAX4173F, MAX4173H, MAX4173T

Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier

Product Details

Key Features

Applications/Uses

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 3000
Output Format Voltage
CMVR (V) (min) 0
CMVR (V) (max) 28
VCC (V) (min) 3
VCC (V) (max) 28
ICC (µA) (typ) 420
Bi-Dir. Curr. Sense No
Gain 100 V/V
20 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 2.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/6
Budgetary
Price (See Notes)
1.26
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Simplified Block Diagram

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 3000
Output Format Voltage
CMVR (V) (min) 0
CMVR (V) (max) 28
VCC (V) (min) 3
VCC (V) (max) 28
ICC (µA) (typ) 420
Bi-Dir. Curr. Sense No
Gain 100 V/V
20 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 2.5
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/6
Budgetary
Price (See Notes)
1.26

Key Features

  • Low-Cost, Compact Current-Sense Solution
  • High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
  • Three Gain Versions Available
    • +20V/V (MAX4173T)
    • +50V/V (MAX4173F)
    • +100V/V (MAX4173H)
  • ±0.5% Full-Scale Accuracy
  • ±3mV Input Offset Voltage (MAX4173T)
  • Wide 1.7MHz Bandwidth (MAX4173T)
  • 420µA Supply Current
  • Available in Space-Saving SOT23 Package

Applications/Uses

  • Cell Phones
  • General System/Board-Level Current Monitoring
  • Notebook Computers
  • PA Bias Control
  • Portable Battery-Powered Systems
  • Power-Management Systems
  • Precision Current Sources
  • Smart Battery Packs/Chargers

Description

The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package. It features a voltage output that eliminates the need for gain-setting resistors and it is ideal for today's notebook computers, cell phones, and other systems where current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems, since it does not interfere with the ground path of the battery charger. The input common-mode range of 0 to +28V is independent of the supply voltage and ensures that the current-sense feedback remains viable even when connected to a battery in deep discharge. The MAX4173's wide 1.7MHz bandwidth makes it suitable for use inside battery charger control loops.

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

The MAX4173 operates from a single +3V to +28V supply, typically draws only 420µA of supply current over the extended operating temperature range (-40°C to +85°C), and is offered in the space-saving SOT23 package.



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Simplified Block Diagram

MAX4173F, MAX4173H, MAX4173T: Typical Operating Circuit MAX4173F, MAX4173H, MAX4173T: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .