Datasheet > LM2621_05

LM2621_05

更新时间： 2024-11-26 04:44:39

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
页数	文件大小	规格书
11页	655K
描述
Low Input Voltage, Step-Up DC-DC Converter

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LM2621_05 数据手册

March 2005

LM2621

Low Input Voltage, Step-Up DC-DC Converter

n 1.09 mm Package Height

n Up to 2 MHz Switching Frequency

The LM2621 is a high efficiency, step-up DC-DC switching

n 1.2V to 14V Input Voltage

General Description

regulator for battery-powered and low input voltage systems.

It accepts an input voltage between 1.2V and 14V and

converts it into a regulated output voltage. The output volt-

age can be adjusted between 1.24V and 14V. It has an

internal 0.17Ω N-Channel MOSFET power switch. Efficien-

cies up to 90% are achievable using the LM2621.

n 1.24V - 14V Adjustable Output Voltage

n Up to 1A Load Current

n 0.17 Ω Internal MOSFET

n Up to 90% Regulator Efficiency

n 80 µA Typical Operating Current

2.5µA Guaranteed Supply Current In Shutdown

The high switching frequency (adjustable up to 2MHz) of the

LM2621 allows for tiny surface mount inductors and capaci-

tors. Because of the unique constant-duty-cycle gated oscil-

lator topology very high efficiencies are realized over a wide

load range. The supply current is reduced to 80µA because

of the BiCMOS process technology. In the shutdown mode,

the supply current is less than 2.5µA.

Applications

n PDAs, Cellular Phones

n 2-Cell and 3-Cell Battery-Operated Equipment

n PCMCIA Cards, Memory Cards

n Flash Memory Programming

n TFT/LCD Applications

n 3.3V to 5.0V Conversion

n GPS Devices

The LM2621 is available in a Mini-SO-8 package. This pack-

age uses half the board area of a standard 8-pin SO and has

a height of just 1.09 mm.

n Two-Way Pagers

n Palmtop Computers

n Hand-Held Instruments

Features

n Small Mini-SO8 Package (Half the Footprint of Standard

8-Pin SO Package)

Typical Application Circuit

10093412

DS100934

www.national.com

12 3 4 5 6 7...11

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LM2621MMX	NSC	获取价格	Low Input Voltage, Step-Up DC-DC Converter
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