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LTC3541-1

更新时间： 2024-09-24 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 356K
描述
High Efficiency Buck + VLDO Regulator

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中文翻译

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LTC3541-1 数据手册

 浏览型号LTC3541-1的Datasheet PDF文件第2页浏览型号LTC3541-1的Datasheet PDF文件第3页浏览型号LTC3541-1的Datasheet PDF文件第4页浏览型号LTC3541-1的Datasheet PDF文件第5页浏览型号LTC3541-1的Datasheet PDF文件第6页浏览型号LTC3541-1的Datasheet PDF文件第7页 
LTC3541-1  
High Efficiency  
Buck + VLDO Regulator  
U
DESCRIPTIO  
FEATURES  
ꢀ High Efficiency, 500mA Buck Plus 300mA VLDO  
Regulator  
TM  
TheꢀLTC®3541-1ꢀcombinesꢀaꢀsynchronousꢀbuckꢀDC/  
DCꢀconverterꢀwithꢀaꢀveryꢀlowꢀdropoutꢀlinearꢀregulatorꢀ  
(VLDO)ꢀtoꢀprovideꢀupꢀtoꢀtwoꢀoutputꢀvoltagesꢀfromꢀaꢀsingleꢀ  
inputꢀvoltageꢀwithꢀminimalꢀexternalꢀcomponents.ꢀWhenꢀ  
configuredꢀforꢀdualꢀoutputꢀoperation,ꢀtheꢀLTC3541-1’sꢀautoꢀ  
start-upꢀfeatureꢀwillꢀbringꢀtheꢀVLDO/linearꢀregulatorꢀoutputꢀ  
intoꢀregulationꢀinꢀaꢀcontrolledꢀmannerꢀpriorꢀtoꢀenablingꢀtheꢀ  
Buckꢀregulatorꢀoutputꢀwithoutꢀtheꢀneedꢀforꢀexternalꢀpinꢀ  
control.ꢀBuckꢀoutputꢀpriorꢀtoꢀVLDO/linearꢀregulatorꢀoutputꢀ  
sequencingꢀmayꢀalsoꢀbeꢀobtainedꢀviaꢀexternalꢀpinꢀcontrol.ꢀ  
TheꢀinputꢀvoltageꢀrangeꢀisꢀideallyꢀsuitedꢀforꢀLi-Ionꢀbattery-  
poweredꢀapplications,ꢀasꢀwellꢀasꢀpoweringꢀsub-3.3Vꢀlogicꢀ  
fromꢀ5Vꢀorꢀ3.3Vꢀrails.  
■
Auto Start-Up Powers VLDO/Linear Regulator  
Output Prior to Buck 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.  
■
ꢀ PDAs/PalmtopꢀPCs  
■
ꢀ DigitalꢀCameras  
IN  
■
ꢀ CellularꢀPhones  
ꢀ PCꢀCards  
ꢀ WirelessꢀandꢀDSLꢀModems  
ꢀ OtherꢀPortableꢀPowerꢀSystems  
■
, LT, LTc, LTM and Burst Mode 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  
U
Buck (Burst) Efficiency and Power Loss vs Load Current  
TYPICAL APPLICATIO  
100  
1
LTC3541-1 Typical Application  
90  
EFFICIENCY  
80  
V
IN  
2.9V TO 5.5V  
0.1  
70  
V
ENVLDO  
IN  
60  
50  
POWER LOSS  
ENBUCK MODE  
LTC3541-1  
0.01  
0.001  
0.0001  
2.2µH  
V
150k  
412k  
OUT1  
2.5V  
SW  
GND  
40  
30  
20  
10  
0
200mA  
LV  
LFB  
IN  
243k  
22pF  
BUCKFB LV  
PGND  
OUT  
V
V
V
= 3.3V  
OUT2  
IN  
OUT  
1.5V  
= 2.5V  
115k  
10µF  
300mA  
2.2µF  
1
10  
100  
1000  
35411 TA01b  
LOAD CURRENT (mA)  
35411 TA01a  
35411fa  
ꢀ
1234567...20

中文翻译

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