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

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.

MAX9937: Typical Operating Circuit MAX9937: Typical Operating Circuit Enlarge+

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
Part NumberOutput FormatCMVR
(V)
CMVR
(V)
VCC
(V)
VCC
(V)
ICC
(µA)
Bi-Dir. Curr. SenseVOS @25°C
(µV)
GainGain Accuracy @25°C
(%)
BW
(kHz)
Comp-
arators
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxminmaxtypmaxmax@ -3dBSee Notes
MAX9937 Voltage4282.75.520No1200Adj.1.53500-40 to +125
SC70/5
$1.17 @1k
See All Current Sense Amplifiers (53)
Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX9937EVKIT: Evaluation Kit for the MAX9937
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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