LMP8646 Datasheet, PDF (1/23 Pages) Texas Instruments – Precision Current Limiter

LMP8646
February 1, 2012
Precision Current Limiter
General 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 common mode
voltage ranging from -2V to 76V. It has a variable gain which
is used to adjust the sense current. The gain is configured
with a single external resistor, R_G, 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 applica-
tions, is configurable with a single external capacitor in par-
allel with R_G. 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 cir-
cuit protection and improved precision systems are required.
The LMP8646 is available in a 6-pin TSOT package and can
operate at temperature range of −40°C to 125°C.
Applications
■ ^{High-side and low-side current limit}
■ ^{Circuit fault protection}
■ ^{Battery and supercap charging}
■ ^{LED constant current drive}
■ ^{Power management}
Features
■ ^{Provides circuit protection and current limiting}
■ ^{Single supply operation}
■ ^{-2V to +76V 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}
■ ^{Output current (source)}
■ ^{Gain accuracy}
■ ^{Transconductance}
■ ^Offset
■ ^{Quiescent current}
■ ^{Input bias}
■ ^PSRR
■ ^CMRR
■ ^{Temperature range}
■ ^{6-Pin TSOT Package}
2.7V to 12V
0 to 5 mA
2.0% (max)
200 µA/V
±1 mV (max)
380 µA
12 µA (typ)
85 dB
95 dB
−40°C to 125°C
Typical Application
LMP™ is a trademark of National Semiconductor Corporation.
© 2012 Texas Instruments Incorporated 301235 SNOSC63
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