LMP8646

更新时间： 2024-10-26 11:46:03

品牌	Logo	应用领域
德州仪器 - TI		限制器
页数	文件大小	规格书
23页	492K
描述
Precision Current Limiter

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LMP8646 数据手册

February 1, 2012

LMP8646

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.

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

2.7V to 12V

0 to 5 mA

2.0% (max)

200 µA/V

±1 mV (max)

380 µA

■

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.

■

12 µA (typ)

85 dB

■

Applications

■

CMRR

Temperature range

6-Pin TSOT Package

95 dB

■

High-side and low-side current limit

■

−40°C to 125°C

■

Circuit fault protection

■

Battery and supercap charging

LED constant current drive

Power management

■

Typical Application

30123534

LMP™ is a trademark of National Semiconductor Corporation.

301235 SNOSC63

www.ti.com

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