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TPS65217DEVM: TPS65217D default output values for VDCDC1-3 and VLDO1-3

Part Number: TPS65217DEVM
Other Parts Discussed in Thread: TPS65217

Hello Everyone,

I'm trying to design the power supply for AM3352 (ZCZ) package using the TPS65217D. Could someone please tell me the default values for the output of the VDCDC1-3 and LDO1-2.

By default VDCDC1-3 and LDO1-2 Enable bit are disabled in it's corresponding registers then how power-up sequence(LDO1 output) starts by given AC in.

Thanks in advance,

Dhanasekaran K

  • Hello Dhanasekaran,

    I assigned your request to the produc expert, who will get back to you shortly.

    According to Table 6 in the datasheet, the D-variant of the IC has the following output voltages, but I asked the expert to verify for EVM:

    DCDC1  1.35V

    DCDC2  1.1V

    DCDC3  1.1V

    LDO1 1.8V

    LDO2 3.3V

    Meanwhile: You refer to "given AC in": Be aware, that this Input, despite called "AC" expects a DC-voltage (4.3V to 5.8V), but I trust you are aware.

    Best regards,

    Frank

  • Dhanasekaran,

    The Voltage values Frank indicated for the -D variant of the TPS65217 are correct, and they are shown on page 3 of the datasheet.

    The power-on sequence is initiated when a rising edge occurs on AC (or USB) or a battery voltage is applied at BAT and the push-button is pressed (PB_IN high-to-low transition). Until one of these wake-up events occurs all the DC-DCs and LDOs are disabled, which is why the Register Map needs to show '0' (not enabled) as the Reset state for these bits.

    Once a wake-up event occurs, Strobe 15 enables LDO1. After this time, all other rails wait for PWR_EN pin to go high (PMIC_PWR_EN signal from the processor). From the time PWR_EN goes high, Strobe 1 occurs immediately the Strobes 2-7 will occur after Delays 1-6, respectively.

    This is shown in Figure 3 on page 19 of the datasheet. Once a power rail is enabled automatically, the data in Register 0x16 will reflect that it is Enabled with a value of '1'. Once each rail is within regulation, the PGOOD bit will change to a '1' in Register 0x0C.

  • Thanks for your detailed explanation.

    I finally knew the operation of TPS65217 in a simple way, thanks once again and I hope our custom board will power up easily.

    Regards,

    Dhanasekaran k

  • No problem. You're quite welcome and we are happy to help.

    If there are any issues with your custom board, please start a new thread to ask these questions and attach your schematic as a PDF if possible.