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RON

RON

CSS

VIN

LM3102

COUT

LOUT

V+

FB

RG

CG

VOUT

ROUT

RFBT

RFBB

V

+

+IN

-IN

RSENSE

LMP8646

VCC

ILIMIT

CIN

CIN

CBST

BST

SW

VIN

SS

V

-

SUPER-

CAP

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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.

LMP8646

SNOSC63B – FEBRUARY 2012 – REVISED DECEMBER 2014

LMP8646 Precision Current Limiter

1

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 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, 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.

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