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MAX9937
Automotive Current-Sense Amplifier with Reverse-Battery Protection

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


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Description
FULL DATA SHEET (PDF, 264kB)
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The MAX9937 is a tiny automotive grade current-sense amplifier designed for unidirectional high-side current-sense applications. This device addresses major areas of concern for automotive 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.

Key Features   Applications/Uses
  • 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

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

    Key Specifications:   Current Sense Amplifiers
    Part Number CMVR (min) (V) CMVR (max) (V) VCC (min) (V) VCC (max) (V) ICC (typ) (µA) Bidirectional Current-Sense VOS (max) @25°C (µV) AV (Gain) Gain Accuracy @25°C (max) (%) -3dB BW (kHz) Comparators Package Operating Temp. Range (°C) Price**
    MAX9937  4 28 2.7 5.5 20 No 1,200 Adj. 1.5 350 0 SC70/5 -40 to +125 $0.58 @ 1k
    See All Current Sense Amplifiers (25)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX9937: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-4233; Rev 0; 2008-08-15
    This page last modified: 2009-01-08


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