LMP8646 - 76V, Configurable Gain and Bandwidth, Low-/High-Side, High-Speed, Current Limiter

The LMP8646 is a precision current limiter used to improve the current limit accuracy ofany switching or linear regulator with an available feedback node.

The LMP8646 accepts input signals with a common-mode voltage ranging from –2 V to 76 V.It has a variable gain which is used to adjust the sense current. The gain is configured with asingle external resistor, R_G, providing a high level of flexibility andaccuracy up to 2%. The adjustable bandwidth, which allows the device to be used with a variety ofapplications, is configurable with a single external capacitor in parallel withR_G. In addition, the output is buffered in order to provide a low outputimpedance.

The LMP8646 is an ideal choice for industrial, automotive, telecommunications, andconsumer applications where circuit protection and improved precision systems are required. TheLMP8646 is available in a 6-pin SOT package and can operate at temperature range of −40°C to125°C.

• Provides Circuit Protection and Current Limiting
• Single Supply Operation
• –2-V to 76-V Common-Mode Voltage Range
• Variable Gain Set by External Resistor
• Adjustable Bandwidth Set by External Capacitor
• Buffered Output
• 3% Output Accuracy Achievable at V_SENSE = 100 mV
• Key Specifications:
  • Supply Voltage Range 2.7 V to 12 V
  • Output Current (Source) 0 to 5 mA
  • Gain Accuracy 2.0% (max)
  • Transconductance 200 µA/V
  • Offset ±1 mV (Maximum)
  • Quiescent Current 380 µA
  • Input Bias 12 µA (Typical)
  • PSRR 85 dB
  • CMRR 95 dB
  • Temperature Range −40°C to 125°C
  • 6-Pin SOT Package

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