BQ24074RGTR Battery Management Li-Ion Batt Chrgr & Pwr-Path Mgmt IC

1.Features

FullycompliantUSBcharger– Selectable100-mAand 500-mAmaximuminputcurrent– 100-mAMaximumcurrentlimit ensurescomplianceto USB-IFstandard– Input-baseddynamicpowermanagement(VIN-DPM)for protectionagainstpoorUSBsources
• 28-VInputRatingwith OvervoltageProtection
•Integrateddynamicpowerpathmanagement(DPPM)functionsimultaneouslyandindependentlypowersthe systemand chargesthebattery
• Supportsup to 1.5-Achargecurrentwithcurrentmonitoringoutput(ISET)
• Programmableinputcurrentlimit up to 1.5 A forwall adapters
• Systemoutputtracksbatteryvoltage(bq24072)
• Programmableterminationcurrent(bq24074)
• Batterydisconnectfunctionwith SYSOFFinput(bq24075,bq24079)
• ProgrammablePre-chargeand Fast-chargesafetytimers
• Reversecurrent,short-circuitand thermalprotectionNTCthermistorinput
• Proprietarystart-upsequencelimitsinrushcurrent
• Statusindication– Charging/done,powergood

2.Applications

martphones
• Portablemediaplayers
• Portablenavigationdevices
• Low-powerhandhelddevices

3.Description

The BQ2407xseriesof devicesare integratedLi-Ionlinearchargersand systempowerpathmanagementdevicestargetedatspace-limitedportableapplications.The devicesoperatefromeithera USBport or an AC adapterand supportchargecurrentsupto 1.5A. Theinputvoltagerangewithinputovervoltageprotectionsupportsunregulatedadapters.The USBinputcurrentlimitaccuracyandstartup sequenceallowthe BQ2407xto meetUSB-IFinrushcurrentspecifications.Additionally,the inputdynamicpowermanagement(VIN-DPM)preventsthechargerfromcrashingincorrectlyconfiguredUSBsources

The BQ2407xfeaturesdynamicpowerpathmanagement(DPPM)that powersthe systemwhilesimultaneouslyandindependentlychargingthebattery.The DPPMcircuitreducesthe chargecurrentwhenthe inputcurrentlimit causesthe systemoutputto fall to the DPPMthreshold;thus,supplyingthesystemloadat all timeswhilemonitoringthe chargecurrentseparately.Thisfeaturereducesthe numberof chargeand dischargecycleson the battery,allowsfor properchargeterminationand enablesthe systemto run with a defectiveor absentbatterypack

4.TypicalApplicationCircuit

5.

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