1 Features
1• 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 VSENSE = 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

2 Applications
• High-Side and Low-Side Current Limit
• Circuit Fault Protection
• Battery and Supercap Charging
• LED Constant Current Drive
• Power Management

3 Description
The LMP8646 is a precision current limiter used to
improve the current limit accuracy of any switching or
linear regulator with an available feedback node.
The LMP8646 accepts input signals with a commonmode
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 a single external
resistor, RG, providing a high level of flexibility and
accuracy up to 2%. The adjustable bandwidth, which
allows the device to be used with a variety of
applications, is configurable with a single external
capacitor in parallel with RG. In addition, the output is
buffered in order to provide a low output impedance.
The LMP8646 is an ideal choice for industrial,
automotive, telecommunications, and consumer
applications where circuit protection and improved
precision systems are required. The LMP8646 is
available in a 6-pin SOT package and can operate at
temperature range of −40°C to 125°C.