BQ24070_14 Datasheet, PDF (20/33 Pages) Texas Instruments – System Power-Path Management IC

bq24070, bq24071
SLUS694G – MARCH 2006 – REVISED DECEMBER 2014
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Compared to chargers without dynamic power path management (DPPM), this single-cell LiIon battery charger
provides instant system power even with a deeply discharged battery. The maximum charge current is set by
ISET2 but the input current limit circuitry, controlled by ISET1 and MODE pins or the DPPM circuitry can reduce
the charge current from the maximum desired value.
9.2 Typical Application
Figure 7. Typical Application Circuit
9.2.1 Design Requirements
A bq24070 (V_OUT = 4.4 V_reg) is powered through an AC adaptor with IN input is set for approximately 5.1 V (1.5 A
current limit), I_(CHG) = 1 A, V_(DPPM-SET) = 3.7 V, V_(DPPM-REG) = 1.15 × V_(DPPM-SET) = 4.26 V, Mode = H, and USB
input is not connected. A 103AT thermistor is inside the battery pack. A 6-hour saftey time-out is desired.
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