
LTC4099
4099fd
n
MediaPlayers
n
PortableNavigationDevices
n
SmartPhones
n
IndustrialHandhelds
n
PortableMedicalInstruments
n
Switching Regulator with Bat-Track Adaptive Output
Control Makes Optimal Use of Limited Input Power
n
I2C Port for Optimal System Performance and
Status Information
n
InputOvervoltage Protection
n
Bat-Track Control of External Step-Down Switching
Regulator Maximizes Efficiency from Automotive
and Other High Voltage Sources
n
Instant-On Operation with Low Battery
n
OptionalOvertemperatureBatteryConditioner
ImprovesHighTemperatureBatterySafetyMargin
n
IdealDiodeSeamlesslyConnectsBatteryWhenInput
PowerisLimitedorUnavailable
n
Full-FeaturedLi-Ion/PolymerBatteryCharger
n
1.5AMaximumChargeCurrentwithThermalLimiting
n
SlewControlReducesSwitchingEMI
n
20-Lead3mm
×4mm×0.75mmQFNPackage
Typical applicaTion
FeaTures
applicaTions
DescripTion
I2C Controlled
USB Power Manager/Charger
with Overvoltage Protection
TheLTC4099isanI2CcontrolledhighefficiencyUSB
PowerPathcontrollerandfull-featuredLi-Ion/Polymer
batterycharger.Itseamlesslymanagespowerdistribution
frommultiplesourcesincludingUSB,awalladapterand
aLi-Ion/Polymerbattery.
TheLTC4099automaticallylimitsitsinputcurrentfor
USBcompatibility.Forautomotiveandotherhighvolt-
ageapplications,theLTC4099interfaceswithanexternal
switchingregulator.BoththeUSBinputandtheauxiliary
inputcontrollerfeatureBat-Trackoptimizedchargingto
providemaximumpowertotheapplicationandreduced
heatinhighpowerdensityapplications.
TheI2Cportallowsdigitalcontrolofimportantapplication
parametersincludinginputcurrentlimit,chargecurrent
andfloatvoltage.Severalstatusbitscanalsobereadback
viaI2C.
AnovervoltageprotectioncircuitguardstheLTC4099
fromhighvoltagedamageonthelowvoltageVBUSpin.The
LTC4099isavailableina20-Lead3mm
×4mm×0.75mm
QFNPackage.
L
,LT,LTC,LTM,LinearTechnologyandtheLinearlogoareregisteredtrademarksof
LinearTechnologyCorporation.PowerPath,Bat-TrackandThinSOTaretrademarksofLinear
TechnologyCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners.
ProtectedbyU.S.Patents,including6522118,6570372,6700364,6819094.Otherpatents
pending.
I2C Controlled High Efficiency Battery Charger/
USB Power Manager
Reduced Power Dissipation
vs Linear Battery Charger
VBUS
USB
OVERVOLTAGE
PROTECTION
10F
0.1F
3.01k
1.02k
6.2k
TO CONTROLLER
SYSTEM
LOAD
4099 TA01a
CLPROG PROG
LTC4099
GND
SW
3.3H
NTC
OVSENS
I2C
OVGATE
VOUT
BAT
BATSENS
NTCBIAS
2
Li-Ion
100k
T
+
LINEAR BATTERY
CHARGER
SWITCHING BATTERY
CHARGER
BATTERY VOLTAGE (V)
3.3
POWER
DISSIP
ATION
(W)
1.2
1.4
1.6
4
1.0
0.8
3.5
3.7
3.4
3.6
3.8 3.9
4.1
0.2
0
0.6
1.8
0.4
4099 TA01b
VIN = 5V
ICHARGE = 1A
ADDITIONAL POWER
AVAILABLE FOR CHARGING