LM2623

更新时间： 2024-11-09 00:01:07

品牌	Logo	应用领域
美国国家半导体 - NSC		振荡器转换器栅升压转换器
页数	文件大小	规格书
12页	212K
描述
General Purpose, Gated Oscillator Based, DC/DC Boost Converter

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LM2623 数据手册

July 2003

LM2623

General Purpose, Gated Oscillator Based, DC/DC Boost

Converter

General Description

Features

n Good Efficiency Over a Very Wide Load Range

n Very Low Output Voltage Ripple

The LM2623 is a high efficiency, general purpose, step-up

DC-DC switching regulator for battery-powered and low in-

put voltage systems. It accepts an input voltage between .8

and 14 volts and converts it into a regulated output voltage

between 1.24 and 14 volts. Efficiencies up to 90% are

achievable with the LM2623.

n Small, Mini-SO-8 Package (Half the Footprint of

Standard 8 pin SO Package)

n 1.09 mm Package Height

n Up to 2 MHz Switching Frequency

n .8V to 14V Operating Voltage

n 1.1V Start-up Voltage

n 1.24V - 14V Adjustable Output Voltage

n Up to 2A Load Current at low Output Voltages

n 0.17Ω Internal MOSFET

n Up to 90% Regulator Efficiency

n 80 µA Typical Operating Current (into V_DDpin of supply)

In order to adapt to a number of applications, the LM2623

allows the designer to vary the output voltage, the operating

frequency (300kHz to 2 MHz) and duty cycle (17% to 90%)

to optimize the part’s performance. The selected values can

be fixed or can vary with battery voltage or input to output

voltage ratio. The LM2623 uses a very simple, on/off regu-

lation mode to produce good efficiency and stable operation

over a wide operating range. It normally regulates by skip-

ping switching cycles when it reaches the regulation limit

(Pulse Frequency Modulation).

2.5µA Guaranteed Supply Current In Shutdown

n 4mm x 4mm Thermally Enhanced LLP Package Option

Note: Please read the "Non-Linear Effect" and "Choosing

The Correct C3 Capacitor" sub-sections of the Design Pro-

cedure section of this data sheet, so that any challenges with

designing with this part can be taken into account before a

board design/layout is finalized.

Applications

n Cameras, Pagers and Cell Phones

n PDAs,Palmtop Computers, GPS devices

n White LED Drive, TFT or Scanned LCDs

n Flash Memory Programming

For Alternative Solutions, See Also: LM2700, LM2622,

LM2731, LM2733, and LM2621.

n Hand-Held Instruments

n 1, 2, 3 or 4 Cell Alkaline Systems

n 1, 2 or 3 Cell Lithium-ion Systems

Typical Application Circuit

20038801

DS200388

www.national.com

12 3 4 5 6 7...12

中文翻译

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与LM2623相关器件

型号	品牌	获取价格	描述	数据表
LM2623_04	NSC	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623_05	NSC	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623_14	TI	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623_15	TI	获取价格	General-Purpose, Gated-Oscillator-Based DC/DC Boost Converter
LM2623ALD	NSC	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623ALD	TI	获取价格	LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623ALD/NOPB	TI	获取价格	0.8V to 14V input voltage, 2A load current, step-up DC-DC 14-WSON -40 to 85
LM2623ALDX	NSC	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623AMM	NSC	获取价格	General Purpose, Gated Oscillator Based, DC/DC Boost Converter
LM2623AMM	TI	获取价格	LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter

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