LMP8646_15 Datasheet, PDF (1/31 Pages) Texas Instruments – LMP8646 Precision Current Limiter

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LMP8646
SNOSC63B – FEBRUARY 2012 – REVISED DECEMBER 2014
LMP8646 Precision Current Limiter
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 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
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 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 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
applications, is configurable with a single external
capacitor in parallel 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 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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMP8646
SOT (6)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
RON
VIN
CIN
CIN
CSS
RON
CBST
BST
VIN
SW
LM3102
VCC
SS
LOUT
V+
FB
COUT
ILIMIT
RSENSE
RG
CG
ROUT
+IN
-IN _V⁺
LMP8646 V^-
-
VOUT
VO_LOAD
SUPER-
CAP
RFBB
RFBT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.