參數(shù)資料
型號(hào)： LTC3541EDD-3#TR
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(shù)： 8/20頁
文件大?。?/td> 379K
代理商： LTC3541EDD-3#TR
LTC3541-3
35413fc
APPLICATIO S I FOR ATIO
W
U
85°Cisapproximately0.25
Ω.TheRDS(ON)oftheN-channel
switchisapproximately0.4
Ω.Therefore,powerdissipated
bythepartisapproximately:
PD=(ILOADBUCK)2RSW(ON)+(ILOADVLDO)
(LVIN–LVOUT)=145mW
Forthe3mm
×3mmDFNpackage,theθJAis43°C/W.
Thus,thejunctiontemperatureoftheregulatoris:
TJ=85°C+(0.145)(43)=91°C
whichiswellbelowthemaximumjunctiontemperature
of125°C.
Notethatathighersupplyvoltages,thejunctiontempera-
tureislowerduetoreducedswitchresistanceRDS(ON).
PC BOARD LAYOUT CHECKLIST
Whenlayingouttheprintedcircuitboard,thefollowing
checklistshouldbeusedtoensureproperoperationofthe
LTC3541-3.Checkthefollowinginyourlayout:
1.Thepowertraces,consistingoftheGNDtrace,theSW
traceandtheVINtraceshouldbekeptshort,directand
wide.
2.Doesthe(+)plateofCINconnecttoVINascloselyas
possible?ThiscapacitorprovidestheACcurrenttothe
internalpowerMOSFETs.
3.Keeptheswitchingnode,SW,awayfromthesensitive
LFBnode.
4. Keep the (–) plates of CIN and COUT as close as
possible.
DESIGN EXAMPLE
Asadesignexample,assumetheLTC3541-3isusedin
asinglelithium-ionbatterypoweredcellularphoneap-
plication.TheVINwillbeoperatingfromamaximumof
4.2Vdowntoabout3V.Theloadcurrentrequirementis
amaximumof0.5Aforthebuckoutputbutmostofthe
timeitwillbeinstandbymode,requiringonly2mA.Ef-
ficiencyatbothlowandhighloadcurrentsisimportant.
Theoutputvoltageforthebuckis1.8V.Therequirementfor
theoutputvoltageoftheVLDOregulatoris1.575Vwhile
providingupto0.3Aofcurrent.Withthisinformationwe
cancalculateLusingEquation2:
L
f
I
V
L
OUT
IN
= ( ) Δ( )
1
(2)
SubstitutingVOUT=1.8V,VIN=3.6V(typ),ΔIL=200mA
andf=2.25MHzinEquation3gives:
L
V
MHz
mA
V
H
=
=
1 8
2 25
200
1
1 8
3 6
2
.
(
)
.
(3)
A2.2
Hinductorworkswellforthisapplication.Forbest
efficiencychoosea600mAorgreaterinductorwithless
than0.2
Ωseriesresistance.
CINwillrequireanRMScurrentratingofatleast0.25A
= ILOAD(MAX)/2 at temperature. COUT for the buck is
chosentohaveavalueof22
FandanESRoflessthan
0.25
Ω.Inmostcases,aceramiccapacitorwillsatisfy
thisrequirement.
COUTfortheVLDOregulatorischosenas2.2F.
相關(guān)PDF資料
PDF描述
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
LTC3543EDCB 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
LTC3542EDC#TRMPBF 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN 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:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關(guān):1MHz 電流 - 輸出:1.5A 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR
LTC3542EDC#TRPBF 功能描述:IC REG BUCK SYNC ADJ 0.5A 6DFN 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:- 標(biāo)準(zhǔn)包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*