Datasheet > LM3487MMX

LM3487MMX

更新时间： 2024-11-26 04:44:27

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关控制器
页数	文件大小	规格书
22页	2284K
描述
High Efficiency High-Side N-Channel Controller for Switching Regulator

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LM3487MMX 数据手册

February 19, 2008

LM3487

High Efficiency High-Side N-Channel Controller for

Switching Regulator

General Description

Features

The LM3487 is a high-side N-channel MOSFET switching

regulator controller. It can be used in topologies requiring a

high side MOSFET such as buck, inverting (buck-boost) and

zeta regulators. The LM3487's internal push pull driver allows

compatibility with a wide range of MOSFETs. A wide input

voltage range and an adjustable current limit allow the

LM3487 to be optimized for a wide variety of applications.

Adjustable/synchronizable switching frequency from

100kHz to 1.4MHz

Adjustable cycle by cycle current limit

■

Wide 3V-35V input voltage range

Thermal shutdown

Frequency compensation optimized with a single

capacitor and resistor

External softstart

The LM3487 has an adjustable switching frequency which

can also be synchronized to an external clock. Current-mode

control requires only a single resistor and capacitor for fre-

quency compensation. The current mode architecture also

yields superior line and load regulation and cycle-by-cycle

current limiting. A 7µA shutdown state can be used for power

savings and for power supply sequencing. Other features in-

clude external soft-start to reduce inrush current and output

over voltage protection.

■

Current mode operation

Undervoltage lockout with hysteresis

10-lead Mini-SO10 (MSOP-10) package

Automotive grade including AEC-Q100 is available

■

Applications

ADSL Modems

■

Local Voltage Regulation

Distributed Power

Notebook and Palmtop Computers

Internet Appliances

Printers and Office Automation

Battery operated Devices

Cable Modems

Battery Chargers

■

Typical Application Circuit

20049233

Typical High Efficiency Step-Down (Buck) Converter

200492

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