BQ24161B_15 Datasheet, PDF (38/52 Pages) Texas Instruments – bq2416xx 2.5A, Dual-Input, Single-Cell Switched-Mode Li-Ion Battery Charger with Power Path Management and I2C Interface

bq24160, bq24160A, bq24161
bq24161B, bq24163, bq24168
SLUSAO0F – NOVEMBER 2011 – REVISED JULY 2014
11 Power Supply Recommendations
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11.1 Requirements for SYS Output
In order to provide an output voltage on SYS, the bq2416xx requires either a power supply between 4.2 V and
6.0 V for USB input on all versions, 4.2 V and 6.0 V for IN input on bq24168 and 4.2 V and 10.0 V on the
remaining versions with at least 100 mA current rating connected to IN or USB OR a single-cell LiIon battery with
voltage > V_BATUVLO connected to BAT. The source current rating needs to be at least 2.5 A in order for the
charger's buck converter to provide maximum output power to SYS.
11.2 Requirements for Charging
In order for charging to occur, the source voltage as measured at the IC's USB or IN pins (factoring in cable/trace
losses from the source) must be greater than the VINDPM threshold (but less than the maximum values above)
and the source's current rating must be higher than the buck converter needs to provide the load on SYS. For
charging at a desired charge current of I_CHRG, V_USBorINx I_USBorIN x η > V_SYS x (I_SYS+ I_CHRG) where η is the
efficiency estimate from Figure 1 or Figure 2 and V_SYS = V_BAT when V_BAT charges above V_MINSYS. The charger
limits I_USBorIN to that input's current limit setting. With I_SYS = 0 A, the charger consumes maximum power at the
end of CC mode, when the voltage at the BAT pin is near V_BATREG but I_CHRG has not started to taper off toward
I_TERM.
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