Texas Instruments LM3686 Handleiding

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V

BATT

SW

PGND

QGND

EN_DCDC

EN_LDO

2.7 V to 5.5 V

Dual Rail

LILO

350 mA

3 MHz

DC-DC

Linear Regulator

300 mA

1 PH

10 PF

0603

0.7 V to 2 V

350 mA

LILO

LDO

300 mA

2.2 PF,

0402

1.2 V to 3.3 V

FB_DCDC

LM3686

4.7 PF, 0603

V

IN_LILO

VIN_LDO

EN_LILO

QGND

1 PF, 0402

QGND

PGND

PGND

1.8 V

1 PF,

0402

QGND

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM3686

SNVS520F–AUGUST2008–REVISEDNOVEMBER2016

LM3686Step-DownDC-DCConverterWithIntegratedPostLinearRegulatorsSystemAnd

Low-NoiseLinearRegulator

1

1Features

1

•DC-DCRegulator

–V

OUT_DCDC

=1.2Vto2.5V

–600-mAMaximumI

LOAD

–3-MHzTypicalPWMFixedSwitching

Frequency

–AutomaticPFM/PWMModeSwitching

–InternalSynchronousRectification

–InternalSoftStart

•Dual-RailLinearRegulator:LILO

–LoadTransients<50-mVPeakTypical

–LineTransients<1-mVPeakTypical

–V

OUT_LILO

=0.7Vto2V

–70-µATypicalI

Q

and300-mAMaximumI

LOAD

•LinearRegulator:LDO

–LoadTransients<80-mVPeakTypical

–LineTransients<1-mVPeakTypical

–V

OUT_LDO

=1.5Vto3.3V

–50-µATypicalI

Q

and350-mAMaximumI

LOAD

•CombinedGlobalFeatures

–V

BATT

≥Maximum(V

OUT_LILO

+1.5V,2.7V)

–OperatesFromaSingleLi-IonCellor3-Cell

NiMH/NiCdBatteries

–100-µAI

Q

and900-mAMaximumI

LOAD

2Applications

•MobileTVs,Hand-HeldRadios

•PersonalDigitalAssistants,Palm-TopPCs

•PortableInstrumentsandPersonalClients

•Battery-PoweredDevices

3Description

TheLM3686isastep-downDC-DCconverterwitha

verylow-dropoutlinearregulatorandalow-noise

linearregulatoroptimizedforpoweringultra-low

voltagecircuits.Itprovidesthreeoutputswith

combinedloadcurrentupto900mAoveraninput

voltagerangefrom2.7Vto5.5V.

Thedeviceofferssuperiorfeaturesandperformance

formanyapplications.Automaticintelligentswitching

betweenPWMlow-noiseandPFMlow-currentmode

offersimprovedsystemcontrol.Duringfull-power

operation,afixed-frequency3MHz(typical),PWM

modedrivesloadsfromapproximately70mAto600

mAmaximum.HystereticPFMmodeextendsthe

batterylifethroughreductionofthequiescentcurrent

to28μA(typical)atlightloadandsystemstandby.

Internalsynchronousrectificationprovideshigh

efficiency.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LM3686DSBGA(12)2.435mm×1.687mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplication

Product specificaties