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CC2652R: cc2652 Internal DC/DC Converter vs Global LDO

Dhanraj
Guru 14820 points
Part Number: CC2652R
Other Parts Discussed in Thread: CC1310

Hello,

I have some queries after reading 13x2,26x2 TRM section 7.3.1 Internal DC/DC Converter and Global LDO, which says -

Normally, the VDDS supply pins of the CC13x2 and CC26x2 device platform are powered from a 1.8-V to 3.8-V supply (for example, batteries), and the VDDR supply pins are powered from the internal DC/DC regulator. Alternatively, the internal global LDO can be used instead of the DC/DC regulator, but this increases the current consumption of the device. In this mode, disconnect DCDC_SW and connect VDDS_DCDC to the VDDS supply. The Global LDO is connected internally to the VDDR pin, which must be connected externally to the VDDR_RF pin. The Global LDO must be decoupled by a µF-sized capacitor on the VDDR net.


 

 

 

1) As per the cc2652 Launchpad reference design by default, Internal DC/DC Converter is used or Global LDO ??

2) how much more current will be consumed when Global LDO is used as compared to Internal DC/DC Converter ??

3) In any scenario, any possibility that power will be switched from Internal DC/DC Converter to Global LDO without any hardware change and result in more power consumption??

  • 0
    TI__Mastermind 27145 points

    Hi Dhanraj,

    1. We used DC-DC Converter on Launchpads.

    2. I will get back to you on this.

    3.

    When operating in DC/DC mode, the power system dynamically switches between the Global LDO and

    DC/DC converter depending on the required load to achieve maximum efficiency. If VDDS drops below

    2.0 V, the DC/DC converter will be less efficient than the LDO and the device will run in global LDO mode.

    Thanks,

    PM

  • 0 in reply to PM
    TI__Mastermind 27145 points

    Hi Dhanraj,

    For Q2:

    Please refer to Figures 5.4, 5.17 and 5.22 in the CC1310 data sheet.  Below 2V corresponds to the Global LDO usage. This is estimated as 20 ~30% higher than the use of DC-DC Converter.

    Thanks,

    PM