TS32101

Final Datasheet

Rev 2.1

January 26, 2016

www.semtech.com

6 of 12

Semtech

Boost Converter Characteristics

ElectricalCharacteristics,T

Symbol

Parameter

Condition

Min

Typ

Max

Unit

Boost Regulator: L=1.0uH and C=44uF

V

OUT

OutputVoltage

3.0

5.5

V

V

FB

FeedbackVoltage

1.175

1.2

1.225

V

R

DSON

HighSideSwitchOnResistance

I

120

mΩ

LowSideSwitchOnResistance

I

50

mΩ

I

OCD

OverCurrentDetect

LSswitchcurrent

3

A

V

ISEN

OutputCurrentThresholdVoltage

23

mV

V

OUT-OV

VOUTOverVoltageThreshold

101

102

103

%V

OUT

DUTY

MAX

MaxDutyCycle

85

%

Functional Description

TheTS32101isafully-integrated,low-voltagesynchronous

boostconverterICbasedonahighly-efficientswitching

topology.ItisoptimizedtobepoweredfromNiMHorLi-

Ionbatteriesandincludesfeaturestomakeitsuitablefor

poweringportableequipmentasanemergencypower/

chargingsource.A2MHzinternalswitchingfrequencyyieldsa

goodbalancebetweenefficiencyandtheabilitytousesmall,

low-costLCfiltercomponents.

Internal Protection Details

Internal Current Limit

Thecurrentthroughthelowsideswitchissensedonacycleby

cyclebasisandifcurrentlimitisreached,itwillabbreviatethe

cycle.Currentlimitisalwaysactivewhentheboostconverter

isenabled.

Adjustable Output Current Limit

TheTS32101hasanadjustableoutputcurrentlimitthat

isimplementedbysensingthevoltageacrossanexternal

resistorplacedinserieswiththeoutput.Thevoltageacross

thisresistoriscontinuouslymonitoredwithnooutputcurrent

limitoccurringuntiltheoutputcurrentislargeenoughto

produceavoltagedropof23mVacrossthesenseresistor.If

thevoltagedropacrossthesenseresistorreaches23mVthe

TS32101willreducethedutycycletolimittheoutputcurrent

andresultinaconstantoutputcurrentlimit.Thisfeaturecan

bedisabledbyconnectingtheISENtoVOUTandremovalof

thesenseresistor.

Adjustable Output Voltage

TheTS32101hasanadjustableoutputvoltageselectedbyan

externalresistordividerinthefeedbackloop.Tochangethe

outputvoltage,replaceresistorsRTOPandRBOTwithvalues

fromthefollowingequation:

VOUT=1.2*(1+R

Power Good

ThePGsignalprovidestheabilitytomonitorfaultconditions

andpowersupplysequencing.ThePGoutputisvalidhigh

whentheTS32101isenabled,theinputvoltageisabovethe

VINunder-voltagethreshold,theoutputvoltageisabove

90%ofthedesiredvalue,andthedeviceisnotinthermal

shutdown.

ThePGoutputcanbeutilizedforpowersupplysequencing.

Whenthedeviceisoperatingnormallyandtheoutputvoltage

isabove90%ofthedesiredvalue,thePGoutputwillbehigh.

A100usdeglitchtimerisusedtoinsurethatthePGsignaldoes

notrespondtonoiseortransients.

Thermal Shutdown

Ifthetemperatureofthedieexceeds150C(typical),theVSW

outputswilltri-statetoprotectthedevicefromdamage.The

PGandallotherprotectioncircuitrywillstayactivetoinform

thesystemofthefailuremode.Oncethedevicecoolsto

140C(typical),thedevicewillattempttostartupagain.If

thedevicereaches150C,theshutdown/restartsequencewill

repeat.ThePGoutputwillbepulledlowinthiscondition.