BQ24070_14 Datasheet, PDF (9/33 Pages) Texas Instruments – System Power-Path Management IC

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8 Detailed Description
bq24070, bq24071
SLUS694G – MARCH 2006 – REVISED DECEMBER 2014
8.1 Overview
The bq2407x device is a highly-integrated Li-ion linear charger and system power-path management device
targeted at space-limited portable applications. The bq2407x devices offer DC supply (AC adapter) power-path
management with autonomous power-source selection, power FETs and current sensors, high-accuracy current
and voltage regulation, charge status, and charge termination, in a single monolithic device.
The bq2407x devices support a precision Li-ion or Li-polymer charging system suitable for single-cell portable
devices. See a typical charge profile, application circuits, and an operational flow chart in Figure 2 through
Figure 6, respectively.
Pre-Conditioning
Phase
Current Regulation Phase
Voltage Regulation and Charge Termination Phase
Regulation
Voltage
Regulation
Current
Minimum
Charge
Voltage
Charge
Voltage
Charge
Complete
Pre−
Conditioning
and Term
Detect
Charge
Current
Figure 2. Charge Profile
UDG−04087
The bq2407x devices power the system while independently charging the battery. This feature reduces the
charge and discharge cycles on the battery, allows for proper charge termination and allows the system to run
with an absent or defective battery pack. This feature also allows for the system to instantaneously turn on from
an external power source in the case of a deeply discharged battery pack. The IC design is focused on supplying
continuous power to the system when available from the AC adapter or battery sources.
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