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.