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LTC3541 PDF预览

LTC3541

更新时间： 2024-11-12 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
20页 346K
描述
High Efficiency Buck + VLDO Regulator

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中文翻译

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LTC3541 数据手册

 浏览型号LTC3541的Datasheet PDF文件第2页浏览型号LTC3541的Datasheet PDF文件第3页浏览型号LTC3541的Datasheet PDF文件第4页浏览型号LTC3541的Datasheet PDF文件第5页浏览型号LTC3541的Datasheet PDF文件第6页浏览型号LTC3541的Datasheet PDF文件第7页 
LTC3541  
High Efficiency  
Buck + VLDO Regulator  
U
DESCRIPTIO  
FEATURES  
ꢀ High Efficiency, 500mA Buck Plus 300mA VLDO  
Regulator  
TM  
TheꢀLTC®3541ꢀcombinesꢀaꢀsynchronousꢀbuckꢀDC/DCꢀ  
converterꢀwithꢀaꢀveryꢀlowꢀdropoutꢀlinearꢀregulatorꢀ  
(VLDO)ꢀtoꢀprovideꢀupꢀtoꢀtwoꢀoutputꢀvoltagesꢀfromꢀaꢀsingleꢀ  
inputꢀvoltageꢀwithꢀminimalꢀexternalꢀcomponents.ꢀWhenꢀ  
configuredꢀforꢀdualꢀoutputꢀoperation,ꢀtheꢀLTC3541’sꢀautoꢀ  
start-upꢀfeatureꢀwillꢀbringꢀtheꢀBuckꢀoutputꢀintoꢀregulationꢀ  
inꢀaꢀcontrolledꢀmannerꢀpriorꢀtoꢀenablingꢀtheꢀVLDOꢀregulatorꢀ  
outputꢀwithoutꢀtheꢀneedꢀforꢀexternalꢀpinꢀcontrol.ꢀVLDO/  
linearꢀregulatorꢀoutputꢀpriorꢀtoꢀBuckꢀoutputꢀsequencingꢀ  
mayꢀalsoꢀbeꢀobtainedꢀviaꢀexternalꢀpinꢀcontrol.ꢀTheꢀinputꢀ  
voltageꢀrangeꢀisꢀideallyꢀsuitedꢀforꢀLi-Ionꢀbattery-poweredꢀ  
applications,ꢀasꢀwellꢀasꢀpoweringꢀsub-3.3Vꢀlogicꢀfromꢀ5Vꢀ  
orꢀ3.3Vꢀrails.  
■
Auto Start-Up Powers Buck Output Prior to  
VLDO/Linear Regulator Output  
■
ꢀ Independent High Efficiency, 500mA Buck  
(V : 2.7V to 5.5V)  
IN  
■
■
■
■
■
■
ꢀ 300mA VLDO Regulator with 30mA Standalone Mode  
ꢀ No External Schottky Diodes Required  
ꢀ Buck Output Voltage Range: 0.8V to 5V  
ꢀ VLDO Input Voltage Range (LV ): 0.9V to 5.5V  
IN  
ꢀ VLDO Output Voltage Range VLDO: 0.4V to 4.1V  
ꢀ SelectableꢀFixedꢀFrequency,ꢀPulse-SkipꢀOperationꢀor  
ꢀ BurstꢀMode®ꢀOperation  
■
ꢀ Short-CircuitꢀProtected  
Theꢀsynchronousꢀbuckꢀconverterꢀprovidesꢀaꢀhighꢀefficiencyꢀ  
output,ꢀtypicallyꢀ90%,ꢀcapableꢀofꢀprovidingꢀupꢀtoꢀ500mAꢀ  
ofꢀcontinuousꢀoutputꢀcurrentꢀwhileꢀswitchingꢀatꢀ2.25MHz,ꢀ  
allowingꢀtheꢀuseꢀofꢀsmallꢀsurfaceꢀmountꢀinductorsꢀandꢀca-  
pacitors.ꢀAꢀmode-selectꢀpinꢀallowsꢀBurstꢀModeꢀoperationꢀ  
toꢀbeꢀenabledꢀforꢀhigherꢀefficiencyꢀatꢀlightꢀloadꢀcurrents,ꢀorꢀ  
disabledꢀforꢀlowerꢀnoise,ꢀconstantꢀfrequencyꢀoperation.ꢀ  
■
ꢀ CurrentꢀModeꢀOperationꢀforꢀExcellentꢀLineꢀandꢀLoadꢀ  
TransientꢀResponse  
■
ꢀ ConstantꢀFrequencyꢀOperation:ꢀ2.25MHz  
■
ꢀ LowꢀDropoutꢀBuckꢀOperation:ꢀ100%ꢀDutyꢀCycle  
■
ꢀ Small,ꢀThermallyꢀEnhanced,ꢀ10-Leadꢀ(3mmꢀ×ꢀ3mm)ꢀ  
DFNꢀPackage  
U
APPLICATIO S  
TheꢀVLDOꢀregulatorꢀprovidesꢀaꢀlowꢀnoise,ꢀlowꢀvoltageꢀ  
outputꢀcapableꢀofꢀprovidingꢀupꢀtoꢀ300mAꢀofꢀcontinuousꢀ  
outputꢀcurrentꢀusingꢀonlyꢀaꢀ2.2µFꢀceramicꢀcapacitor.ꢀTheꢀ  
inputꢀsupplyꢀvoltageꢀofꢀtheꢀVLDOꢀregulatorꢀ(LV )ꢀmayꢀ  
comeꢀfromꢀtheꢀbuckꢀregulatorꢀorꢀaꢀseparateꢀsupply.  
, LT, LTc and LTM are registered trademarks of Linear Teꢀhnology corporation.  
VLDO is a trademark of Linear Teꢀhnology corporation.  
All other trademarks are the property of their respeꢀtive owners.  
Proteꢀted by U.S. Patents, inꢀluding 5481178, 6611131, 6304066, 6498466, 6580258  
■
ꢀ PDAs/PalmtopꢀPCs  
■
ꢀ DigitalꢀCameras  
IN  
■
ꢀ CellularꢀPhones  
ꢀ PCꢀCards  
ꢀ WirelessꢀandꢀDSLꢀModems  
ꢀ OtherꢀPortableꢀPowerꢀSystems  
■
■
■
U
Buck (Burst) Efficiency and Power Loss vs Load Current  
TYPICAL APPLICATIO  
100  
1
LTC3541 Typical Application  
90  
EFFICIENCY  
80  
V
IN  
0.1  
2.9V TO 5.5V  
70  
SW  
ENVLDO  
MODE  
60  
50  
POWER LOSS  
V
2.2µH  
IN  
0.01  
0.001  
0.0001  
LTC3541  
150k  
412k  
243k  
ENBUCK  
BUCKFB  
GND  
LFB  
40  
30  
20  
10  
0
V
OUT1  
2.5V  
22pF  
200mA  
LV  
LV  
OUT  
IN  
V
V
V
= 3.3V  
OUT2  
IN  
OUT  
PGND  
1.5V  
= 2.5V  
10µF  
115k  
300mA  
2.2µF  
1
10  
100  
1000  
3541 TA01b  
LOAD CURRENT (mA)  
3541 TA01a  
3541fa  
ꢀ
1234567...20

中文翻译

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与LTC3541相关器件

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 		高效率降压 + VLDO 稳压器
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LTC3541EDD-1#PBF Linear

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 		LTC3541-1 - High Efficiency Buck + VLDO Regulator; Package: DFN; Pins: 10; Temperature Ran
LTC3541EDD-1-PBF Linear

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 		High Efficiency Buck + VLDO Regulator

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