- 您現(xiàn)在的位置：買賣IC網 > PDF目錄44991 > LTC3541EDD-3 (LINEAR TECHNOLOGY CORP) 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 PDF資料下載
參數資料
| 型號： | LTC3541EDD-3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, PLASTIC, M0-229WEED-2, DFN-10 |
| 文件頁數： | 6/20頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC3541EDD-3 |
LTC3541-3
35413fc
APPLICATIO S I FOR ATIO
W
U
orlessisrecommendedtoensurestability.TheLTC3541-3
VLDOisamicropowerdeviceandoutputtransientresponse
willbeafunctionofoutputcapacitance.Largervalues
ofoutputcapacitancedecreasethepeakdeviationsand
provideimprovedtransientresponseforlargerloadcurrent
changes.Notethatbypasscapacitorsusedtodecouple
individualcomponentspoweredbytheLTC3541-3will
increasetheeffectiveoutputcapacitorvalue.HighESR
tantalum and electrolytic capacitors may be used, but
alowESRceramiccapacitormustbeinparallelatthe
output.ThereisnominimumESRormaximumcapacitor
sizerequirement.
Extraconsiderationmustbegiventotheuseofceramic
capacitors.Ceramiccapacitorsaremanufacturedwitha
varietyofdielectrics,eachwithdifferentbehavioracross
temperature and applied voltage. The most common
dielectricsusedareZ5U,Y5V,X5RandX7R.TheZ5U
andY5Vdielectricsaregoodforprovidinghighcapaci-
tancesinasmallpackage,butexhibitlargevoltageand
temperaturecoefficientsasshowninFigures6and7.
Whenusedwitha2Vregulator,a1FY5Vcapacitorcan
loseasmuchas75%ofitsinitialcapacitanceoverthe
operatingtemperaturerange.TheX5RandX7Rdielectrics
resultinmorestablecharacteristicsandareusuallymore
suitableforuseastheoutputcapacitor.TheX7Rtypehas
betterstabilityacrosstemperature,whiletheX5Risless
expensiveandisavailableinhighervalues.Inallcases,
theoutputcapacitanceshouldneverdropbelow1For
instabilityordegradedperformancemayoccur.
EFFICIENCY CONSIDERATIONS
Generally,theefficiencyofaregulatorisequaltotheout-
putpowerdividedbytheinputpowertimes100%.Itis
oftenusefultoanalyzeindividuallosstermstodetermine
whichtermsarelimitingefficiencyandwhatifanychange
wouldyieldthegreatestimprovement.Efficiencycanbe
expressedas:
Efficiency=100%–(L1+L2+L3+...)
whereL1,L2,etc.aretheindividuallosstermsasaper-
centageofinputpower.
Althoughalldissipativeelementsinthecircuitproduce
losses,threemainsourcestypicallyaccountforthemajor-
ityofthelossesintheLTC3541-3circuits:VINquiescent
current,I2RlossesandlossacrossVLDOoutputdevice.
WhenoperatingwithboththebuckandVLDOregulator
active(ENBUCKandENVLDOequaltologichigh),VIN
quiescentcurrentlossandlossacrosstheVLDOoutput
devicedominatetheefficiencylossatlowloadcurrents,
whereastheI2RlossandlossacrosstheVLDOoutput
devicedominatetheefficiencylossatmediumtohighload
currents.Atlowloadcurrentswiththepartoperatingwith
thelinearregulator(ENBUCKequaltologiclow,ENVLDO
Figure 6. Change in Capacitor vs Bias Voltage
Figure 7. Change in Capacitor vs Temperature
Dc BIAS VOLTAGE (V)
cHANGE
IN
VALUE
(%)
35413 F06
20
0
–20
–40
–60
–80
–100
0
4
8
10
2
6
X5R
Y5V
BOTH cAPAcITORS ARE 1
F,
10V, 0603 cASE SIZE
TEMPERATURE (
°c)
–50
–100
cHANGE
IN
VALUE
(%)
–80
–60
–40
–20
X5R
Y5V
20
–25
0
25
50
35413 F07
75
0
BOTH cAPAcITORS ARE 1
F,
10V, 0603 cASE SIZE
相關PDF資料 |
PDF描述 |
|---|---|
| LTC3541EDD-3#TR | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3542EDC | 0.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3542ES6 | 0.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3543EDCB#PBF | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3543EDCB#TRM | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC3541EDD-3#PBF | 功能描述:IC REG DL BCK/LINEAR SYNC 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LTC3541EDD-3#TRPBF | 功能描述:IC REG DL BCK/LINEAR SYNC 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LTC3542 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA, 2.25MHz Synchronous Step-Down DC/DC Converter |
| LTC3542-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA, 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter |
| LTC3542EDC#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 2.25MHZ 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 2.25MHZ, 500mA, DFN-6; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:500mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:6-DFN ;RoHS Compliant: Yes |
發(fā)布緊急采購，3分鐘左右您將得到回復。