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參數(shù)資料
| 型號： | LM2623MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | General Purpose, Gated Oscillator Based, DC/DC Boost Converter |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MINI, SO-8 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 216K |
| 代理商： | LM2623MMX |
LM2623
General Purpose, Gated Oscillator Based, DC/DC Boost
Converter
General Description
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.
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).
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.
For Alternative Solutions, See Also: LM2700, LM2622,
LM2731, LM2733, and LM2621.
Features
n
Good Efficiency Over a Very Wide Load Range
n
Very Low Output Voltage Ripple
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
0.17
Internal MOSFET
n
Up to 90% Regulator Efficiency
n
80 μA Typical Operating Current (into V
DD
pin of supply)
n
<
2.5μA Guaranteed Supply Current In Shutdown
n
4mm x 4mm Thermally Enhanced LLP Package Option
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
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
July 2003
L
2003 National Semiconductor Corporation
DS200388
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2623MMX/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM2625M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM2630 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Step-Down Power Supply Controller |
| LM2630B-ADJ WAF | 制造商:Texas Instruments 功能描述: |
| LM2630MTCADJ | 制造商:Texas Instruments 功能描述:NEW |
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