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參數(shù)資料
| 型號： | LM3351MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched Capacitor Voltage Converter |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 275 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MINI, SO-8 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 265K |
| 代理商： | LM3351MMX |
Typical Performance Characteristics
(Continued)
Pin Description
Pin
1
Name
Cap1+
Function
Positive terminal for the first charge
pump capacitor.
Negative terminal for the first charge
pump capacitor.
Positive terminal for the second charge
pump capacitor.
Negative terminal for the second charge
pump capacitor.
In Step-Up mode, this will be the input
terminal. In Step-Down mode, this will
be the output terminal.
Ground
In Step-Down mode, this will be the
input terminal. In Step-Up mode, this
will be the output terminal.
Active high CMOS logic level Enable
Input. Connect to Voltage Input terminal
to enable the IC. Connect to Ground
(Pin 6) to disable.
2
Cap1
3
Cap2+
4
Cap2
5
V
low
6
7
Gnd
V
high
8
Enable
Detailed Operation
OPERATING PRINCIPLE
The LM3351 is a charge-pump voltage converter that pro-
vides a voltage conversion ratio of 3/2 in step-up mode and
a conversion ratio of 2/3 in the step-down mode. Thus it can
be used in the step-down mode to provide a 3.3V output
from a regulated 5V input or in the step-up mode to provide
a 5V output from a regulated 3.3V input. Other values of in-
put voltages can be used as long as they are within the lim-
its.
The LM3351 contains an array of CMOS switches which are
operated in a certain sequence to provide the step-up or
step-down of the input supply. An internal RC oscillator pro-
vides the timing signals.
Energy transfer and storage are provided by four inexpen-
sive ceramic capacitors. The selection of these capacitors is
explained in the Capacitor Selection section under Applica-
tion Information.
V
out
vs I
load
(Step-Down)
DS100146-7
P
η
vs I
load
(Step-Down)
DS100146-8
Output Source Impedance vs
Temperature (Step-Down)
DS100146-9
Switching Frequency vs
Temperature
DS100146-10
L
www.national.com
4
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| LM3352-3.3EVAL | 功能描述:EVALUATION BOARD FOR LM3352-3.3 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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