BQ51221 datasheet(13/50 Pages) TI2

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RECT

OUT

Figure 7-17. BQ51013B Typical Start-Up With a 1-A

System Load

OUT

RECT

Figure 7-18. Adaptive Communication Limit Event

Where the 400 mA Current Limit is Enabled (IOUT-DC

< 300 mA)

OUT

RECT

Figure 7-19. Adaptive Communication Limit Event

Where the Current Limit is IOUT + 50 mA (IOUT-DC >

300 mA)

Figure 7-20. RX Communication Packet Structure

1. Efficiency measured from DC input to the transmitter to DC output of the receiver. The BQ500210EVM-689

TX was used for these measurements. Measurement subject to change if an alternate TX is used.

2. Total droop experienced at the output is dependent on receiver coil design. The output impedance must be

low enough at that particular operating frequency in order to not collapse the rectifier below 5 V.

3. On-the-go mode is enabled by driving EN1 high. In this test, the external PMOS is connected between the

output of the BQ51013B device and the AD pin; therefore, any voltage source on the output is supplied to the

AD pin.

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BQ51013B

SLUSB62D – MARCH 2013 – REVISED SEPTEMBER 2020

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BQ51221 Datasheet(PDF) 13 Page - Texas Instruments