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Automotive Current-Sense Amplifier with Reverse-Battery Protection

Current-Sense Amplifier with Reverse-Battery and Load-Dump Protection from -20V to +40V

Product Details

Key Features

Parametric specs for Current Sense Amplifiers
VOS @25°C (µV) (max) 1200
Output Format Voltage
CMVR (V) (min) 4
CMVR (V) (max) 28
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 20
Bi-Dir. Curr. Sense No
Gain Adj.
Gain Accuracy @25°C (%) (max) 1.5
Oper. Temp. (°C) -40 to +125
Package/Pins SC70/5
Budgetary
Price (See Notes)
1.33
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Simplified Block Diagram

Support & Training

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Sampling:
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Parameters

Parametric specs for Current Sense Amplifiers
VOS @25°C (µV) (max) 1200
Output Format Voltage
CMVR (V) (min) 4
CMVR (V) (max) 28
VCC (V) (min) 2.7
VCC (V) (max) 5.5
ICC (µA) (typ) 20
Bi-Dir. Curr. Sense No
Gain Adj.
Gain Accuracy @25°C (%) (max) 1.5
Oper. Temp. (°C) -40 to +125
Package/Pins SC70/5
Budgetary
Price (See Notes)
1.33

Key Features

  • Reverse Battery and Load-Dump Protection
    • -20V to +40V
  • +4V to +28V Input Common-Mode Range
  • Flexible EMI Filtering
  • Low VOS: ±1.2mV (max)
  • Low VOS Drift : 1µV/°C (typ)
  • 20µA Supply Current
  • 350kHz, 3dB Small-Signal Bandwidth

Applications/Uses

  • Battery Current Sense
  • ECU Current Monitor
  • Fuse Box Current Sense

Description

The MAX9937 is a tiny current-sense amplifier designed for unidirectional high-side current-sense applications. This device addresses major areas of concern for various applications including load-dump protection up to +40V, reverse-battery protection, and filtering for EMI and transient performance.

The MAX9937 also features a low input offset voltage of ±1.2mV (max) at +25°C with a low temperature drift of just 1µV/°C (typ).

The MAX9937 is available in a 5-pin SC70 package and is rated over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX9937: Typical Operating Circuit MAX9937: 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.