Yet another way to get longer battery life for the nRF24L01+


  • Hero Member

    I was just noticing that for the CC1101 transceiver TI uses the TPS62730 as a neat trick to make it draw less current while in TX or RX, and I presume that same trick might also work for the nRF24L01+:

    Reduced Battery Current using
    TPS62730
     The TPS62730 [26] is a step down
    converter with bypass mode for ultra low
    power wireless applications.
     In RX, the current drawn from a 3.6 V
    battery is typically less than 11 mA when
    TPS62730 output voltage is 2.1 V. When
    connecting CC1101 directly to a 3.6 V
    battery the current drawn is typically 17
    mA (see Figure 1)
     In TX, at maximum output power (+12
    dBm), the current drawn from a 3.6 V
    battery is typically 22 mA when TPS62730
    output voltage is 2.1 V. When connecting
    CC1101 directly to a 3.6 V battery the
    current drawn is typically 34 mA (see
    Figure 2).
     When CC1101 enters SLEEP mode, the
    TPS62730 can be put in bypass mode for
    very low power down current
     The typical TPS62730 current consumption
    is 30 nA in bypass mode.
     The CC1101 is connected to the battery via
    an integrated 2.1 Ω (typical) switch in
    bypass mode


    http://www.ti.com/product/TPS62730

    The nRF52 has this kind of DC-DC converter already built into the chip itself, and it works quite well! I'm especially interested in whether it would work for LoRa modules, which tend to draw a lot of current because of their low datarate.

    I suppose you could also use it for the MCU and maybe get some benefits that way as well.


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