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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)： | 7/11頁 |
| 文件大?。?/td> | 216K |
| 代理商： | LM2623MMX |
Detailed Description
OPERATING PRINCIPLE
The LM2623 is designed to provide step-up DC-DC voltage
regulation in battery-powered and low-input voltage sys-
tems. It combines a step-up switching regulator, N-channel
power MOSFET, built-in current limit, thermal limit, and volt-
age reference in a single 8-pin MSOP package
Figure 1
. The
switching DC-DC regulator boosts an input voltage between
.8V and 14V to a regulated output voltage between 1.24V
and 14V. The LM2623 starts from a low 1.1V input and
remains operational down to below .8V.
This device is optimized for use in cellular phones and other
applications requiring a small size, low profile, as well as low
quiescent current for maximum battery life during stand-by
and shutdown. A high-efficiency gated-oscillator topology
offers an output of up to 2A at low output voltages.
Additional features include a built-in peak switch current
limit, and thermal protection circuitry.
GATED OSCILLATOR CONTROL SCHEME
The on/off regulation mode of the LM2623, along with its
ultra-low quiescent current, results in good efficiency over a
very wide load range. The internal oscillator frequency can
be programmed using an external resistor to be constant or
vary with the battery voltage. Adding a capacitor to program
the frequency allows the designer to adjust the duty cycle
and optimize it for the application. Adding a resistor in addi-
tion to the capacitor allows the duty cycle to dynamically
compensate for changes to the input/output voltage ratio.
We call this a RatioAdaptive Gated Oscillator circuit. See the
Application Notes for sample application circuits. Using the
correct RC components to adjust the oscillator allows the
part to run with low ripple and high efficiency over a wide
range of loads and input/output voltages.
20038814
FIGURE 1. Functional Diagram
L
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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