BQ24232HA Datasheet, PDF (29/36 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger

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Typical Application (continued)
bq24232HA
SLUSCG4 – MAY 2016
V_IN
10 V/div
I_BAT
V_OUT
4.4 V
V_BAT
4.2 V
200 mA/div
200 mV/div
40 ms/div
R_LOAD = 25Ω
Figure 28. OVP Fault V_IN = 6 V to 15 V
9 Power Supply Recommendations
9.1 Requirements for OUT Output
In order to provide an output voltage on SYS, the bq24232HA requires a power supply between 4.35 V and 10 V
to fully charge a battery. The supply must have at least 100 mA current rating connected to IN; or, a single-cell
Li-Ion battery with voltage around 2.2 V connected to BAT. The source current rating needs to be at least 1.5 A
in order to provide maximum output current to SYS.
9.2 USB Sources and Standard AC Adapters
In order for charging to occur the source voltage measured at the IN terminals of the IC, factoring in cable/trace
losses from the source, must be greater than the VINDPM threshold (in USB mode), but less than the maximum
values shown above. The current rating of the source must be higher than the load requirements for OUT in the
application. For charging at a desired charge current of ICHRG, IIN > (ISYS+ ICHRG). The charger limits IIN to
the current limit setting of EN1/EN2.
9.3 Half-Wave Adapters
Some low-cost adapters implement a half rectifier topology, which causes the adapter output voltage to fall below
the battery voltage during part of the cycle. To enable operation with low-cost adapters under those conditions,
the bq24232HA keeps the charger on for at least 20 ms (typical) after the input power puts the part in sleep
mode. This feature enables use of external low-cost adapters using 50-Hz networks.
Copyright © 2016, Texas Instruments Incorporated
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