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參數(shù)資料
| 型號(hào)： | LM3351 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Switched Capacitor Voltage Converter |
| 中文描述： | 開關(guān)電容電壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | LM3351 |
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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| LM3351MM | Switched Capacitor Voltage Converter |
| LM3351MMX | Switched Capacitor Voltage Converter |
| LM3355MM-4.1 | Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter |
| LM3355MMX-4.1 | Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter |
| LM336AH-2.5 | 2.5V Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3351A WAF | 制造商:Texas Instruments 功能描述: |
| LM3351AM E WAF | 制造商:Texas Instruments 功能描述: |
| LM3351MM | 功能描述:IC REG MULTI CONFIG 50MA 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| LM3351MM/NOPB | 功能描述:IC REG MULTI CONFIG 50MA 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| LM3351MM/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
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