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Quad Current-Sense Amplifier with Overcurrent Threshold Comparators

Accurate Current Measurement with Automatic Overcurrent Shutdown for Four Supply Rails

Product Details

The MAX34406 is a quad, high-side, unidirectional, current-sense amplifier that offers precision accuracy. It provides analog outputs for each of the four amplifiers that can be routed to an external ADC, and contains four overcurrent comparators with a fixed 1.0V threshold. All four comparators are logically ORed, and the result can be delayed/filtered with an external capacitor before it is fed to a latched common shutdown open-drain output pin.

Key Features

  • Four Precision Current-Sense Amplifiers
  • Fixed Gains of 25V/V, 50V/V, 100V/V, and 200V/V
  • Less Than ±600µV of Input Offset
  • Less Than ±0.6% of Gain Error (T/F/H) or ±0.8% of Gain Error (W)
  • Wide 2.0V to 28V Common Mode Range
  • Analog Voltage Outputs for Each Amplifier
  • Independent Overcurrent Comparators with Fixed 1.0V Threshold
  • Low Power Consumption
  • -40°C to +85°C Temperature Range
  • Small 24-Pin TQFN (4mm x 4mm) Package

Applications/Uses

  • Base Stations
  • Industrial Controls
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems
Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 5
10
20
40
VOS @25°C (µV) (max) 600
Output Format Voltage
CMVR (V) (min) 2
CMVR (V) (max) 28
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 100
Bi-Dir. Curr. Sense No
Gain 100 V/V
200 V/V
25 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 0.6
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/24
Budgetary
Price (See Notes)
$1.70 @1k
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Technical Docs

Design & Development

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Description

The MAX34406 evaluation kit (EV kit) simplifies evaluation of the MAX34406 quad current-sense amplifier with overcurrent threshold comparators. The EV kit is fully assembled and ready for operation. It is shipped with four 10mΩ sense resistors in parallel on each channel, which creates an effective sense resistance of 2.5mΩ. The EV kit ships with the MAX34406 device installed, which provides a fixed gain of 100V/V. The 2.5mΩ sense resistance and 100V/V gain provide an overcurrent threshold of 4A on each channel. The sense resistors on the EV kit can be changed to adjust the overcurrent threshold. The PCB and the terminals on the EV kit can support currents up to 32A on each channel.

View Details

Features

  • Quick Evaluation of the MAX34406
  • Fully Assembled and Tested
  • Ready for Operation Out of the Box
  • Configured for 4A Thresholds on Each Channel
  • Support Currents Up to 32A on Each Channel
  • Access to Sense Resistors for Threshold Adjustment
  • Amplifier Filtering Can be Added
  • Labeled Test Points for Key Signals
  • PCB Mounting Holes

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Support & Training

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 5
10
20
40
VOS @25°C (µV) (max) 600
Output Format Voltage
CMVR (V) (min) 2
CMVR (V) (max) 28
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 100
Bi-Dir. Curr. Sense No
Gain 100 V/V
200 V/V
25 V/V
50 V/V
Gain Accuracy @25°C (%) (max) 0.6
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/24
Budgetary
Price (See Notes)
$1.70 @1k

Key Features

  • Four Precision Current-Sense Amplifiers
  • Fixed Gains of 25V/V, 50V/V, 100V/V, and 200V/V
  • Less Than ±600µV of Input Offset
  • Less Than ±0.6% of Gain Error (T/F/H) or ±0.8% of Gain Error (W)
  • Wide 2.0V to 28V Common Mode Range
  • Analog Voltage Outputs for Each Amplifier
  • Independent Overcurrent Comparators with Fixed 1.0V Threshold
  • Low Power Consumption
  • -40°C to +85°C Temperature Range
  • Small 24-Pin TQFN (4mm x 4mm) Package

Applications/Uses

  • Base Stations
  • Industrial Controls
  • Network Switches/Routers
  • Servers
  • Smart Grid Network Systems

Description

The MAX34406 is a quad, high-side, unidirectional, current-sense amplifier that offers precision accuracy. It provides analog outputs for each of the four amplifiers that can be routed to an external ADC, and contains four overcurrent comparators with a fixed 1.0V threshold. All four comparators are logically ORed, and the result can be delayed/filtered with an external capacitor before it is fed to a latched common shutdown open-drain output pin.

Technical Docs

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