BL3406B
1.5 MHz, 800mA Synchronous Buck Converter
ꢀ
•ꢀ GPSꢀReceiversꢀ
FEATURES
ꢀ
DESCRIPTION
ꢀ
•ꢀ HighꢀEfficiency:ꢀUpꢀtoꢀ96%ꢀ
•ꢀ 1.5MHzꢀConstantꢀSwitchingꢀFrequencyꢀ
•ꢀ CurrentꢀModeꢀOperationꢀforꢀExcellentꢀ
LineꢀandꢀLoadꢀTransientꢀResponseꢀ
•ꢀ NoꢀSchottkyꢀDiodeꢀRequiredꢀ
•ꢀ 2.5Vꢀtoꢀ5.5VꢀInputꢀVoltageꢀRangeꢀꢀ
•ꢀ 1.0V,1.2V,1.5V,1.8V,2.5Vꢀandꢀ3.3Vꢀ
Fixed/AdjustableꢀOutputꢀVoltageꢀ
•ꢀ 100%ꢀDutyꢀCycleꢀinꢀDropoutꢀModeꢀ
•ꢀ LowꢀQuiescentꢀCurrent:ꢀ180ꢁAꢀ
•ꢀ OverꢀtemperatureꢀProtectionꢀ
•ꢀ ShortꢀCircuitꢀProtectionꢀ
•ꢀ ShutdownꢀQuiescentꢀCurrentꢀ<ꢀ1ꢁAꢀ
•ꢀ SpaceꢀSavingꢀ5ꢂPinꢀThinꢀSOT23ꢀPackageꢀ
ꢀ
APPLICATIONS
•ꢀ CellularꢀandꢀSmartꢀPhonesꢀ
•ꢀ WirelessꢀHandsetsꢀandꢀDSLꢀModemsꢀ
•ꢀ MicroprocessorsꢀandꢀDSPꢀCoreꢀSuppliesꢀ
•ꢀ PDAsꢀ
•ꢀ DigitalꢀStillꢀandꢀVideoꢀCamerasꢀ
•ꢀ MP3/MP4/MP5ꢀPlayersꢀ
•ꢀ PortableꢀInstrumentsꢀ
ꢀ
Theꢀ BL3406Bꢀ isꢀ aꢀ constantꢀ frequency,ꢀ
1.5MHz,ꢀ slopeꢀ compensatedꢀ currentꢀ modeꢀ
PWMꢀstepꢂdownꢀconverterꢀworkingꢀunderꢀanꢀ
inputꢀ voltageꢀ rangeꢀ ofꢀ 2.5Vꢀ toꢀ 5.5V.ꢀ Thisꢀ
featureꢀ makesꢀ theꢀ BL3406Bꢀ suitableꢀ forꢀ
singleꢀcellꢀLiꢂionꢀbatteryꢂpoweredꢀapplications.ꢀ
Theꢀ internalꢀ synchronousꢀ rectifierꢀ isꢀ desiredꢀ
toꢀ increaseꢀ efficiencyꢀ withoutꢀ anꢀ externalꢀ
Schottkyꢀ diode.ꢀ 100%ꢀ dutyꢀ cycleꢀ capabilityꢀ
extendsꢀbatteryꢀlifeꢀinꢀportableꢀdevices,ꢀwhileꢀ
theꢀ quiescentꢀ currentꢀ isꢀ 180ꢁAꢀ atꢀ noꢀ load,ꢀ
andꢀ dropsꢀ toꢀ <ꢀ 1ꢁAꢀ inꢀ shutdown.ꢀ Pulseꢀ
SkippingꢀModeꢀoperationꢀincreasesꢀefficiencyꢀ
atꢀ lightꢀ loads,ꢀ furtherꢀ extendingꢀ batteryꢀ life.ꢀ
TheꢀBL3406Bꢀisꢀofferedꢀinꢀaꢀlowꢀprofileꢀ(1mm)ꢀ
5ꢂpin,ꢀ thinꢀ SOT23ꢀ package,ꢀ andꢀ isꢀ availableꢀ
inꢀ anꢀ adjustableꢀ versionꢀ andꢀ fixedꢀ outputꢀ
versionsꢀofꢀ1.0V,ꢀ1.2V,ꢀ1.5Vꢀ,ꢀ1.8V,ꢀ2.5Vꢀandꢀ
3.3V.ꢀ
ꢀ
ꢀ
ORDERING INFORMATIONꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ TYPICAL APPLICATIONꢀ
BL3406Bꢀ–XXꢀXꢀXXXꢀ
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ
ꢀ
Package:ꢀ
TRN:ꢀTSOT23ꢂ5ꢀ
RN:ꢀSOT23ꢂ5ꢀ
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ
ꢀ
ꢀ
H
2.2Lꢀ1
ꢁ
ꢀ
ꢀ
2.7Vꢀꢂꢀ4.2V
ꢀ
VOUTꢀ
ꢀ
1.8V
ꢀ
ꢀ
SWꢀ 3
ꢀ
4
ꢀ
VINꢀ
Features:ꢀ
P:ꢀStandardꢀ(default,ꢀ
leadꢀfree)ꢀ
VIN
ꢀ
ꢀ
C1
ꢀ
ꢀ
C2
ꢀ
2C23pFꢀ
BL3406B-ADJ
ꢀ
4.7uF
ꢀ
10uF
ꢀ
C:ꢀCustomizedꢀ
5ꢀ
1
ꢀ
VFB
ꢀ
Run
ꢀ
ꢀ
R2
200k
R1
100k
ꢀ
ꢀ
OutputꢀVoltage:ꢀ
ꢀꢀꢀ10:ꢀ1.0Vꢀ
ꢀꢀꢀ12:ꢀ1.2Vꢀ
GND
ꢀ
ꢀ
ꢀ
2
ꢀ
ꢀꢀꢀ15:ꢀ1.5Vꢀ
ꢀꢀꢀ18:ꢀ1.8Vꢀ
ꢀꢀꢀ25:ꢀ2.5Vꢀ
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ
Figureꢀ1.ꢀꢀBL3406BꢂADJꢀTypicalꢀApplicationꢀCircuit
ꢀꢀꢀ33:ꢀ3.3Vꢀ
ꢀꢀꢀAD:ꢀAdjustableꢀꢀ
PPMIC BU
BL3406B Rev 1.5
10/2009
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