bq25046

SLUSA83 – SEPTEMBER 2010

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Figure 3 shows typical waveforms for BQ25046 used in the wireless power system shown in Figure 2. In this plot

the BQ25046 IN voltage is blue, OUT voltage is red, PG voltage is green, and CHG voltage is magenta. As you

can see at the initial ping (i.e., beginning of power transfer) the IN voltage rises to 5 V and then the

MSP430BQ1010 begins to communicate to the transmitter via load modulation. After sending several messages

to establish communication with the transmitter, the BQ25046 OUT voltage is enabled and then the CHG pin is

pulled low. From this point forward the MSP430BQ1010 periodically communicates with the transmitter, and a

5-V regulated DC output voltage is present at the BQ25046 OUT pin.

Figure 3. Power-Up In a Wireless Power Application

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