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LM3279

Perico Eldelospalotes
Intellectual 505 points
Other Parts Discussed in Thread: LM3279, LM3248

Hello everybody!

            We are designing a new device. Our device will integrate various modules, including a GSM modem. This modem is 2G. I was wondering if it is a good idea to add a buck-boost converter to regulate the recheargable battery voltage to a fixed voltage of 3.8 V. As you know, the lithium battery voltage goes from 4.2 V when the battery is full and goes to 3 V when is dead, so with a buck-boost we will assure a constant voltage of 3.8 V. These are my doubts:

- Can we use LM3279 on 2G applications?

- Is it a good idea to use a buck-boost to get the most out of the battery?

                         Thank you in advance!!

 

  • 0
    TI__Mastermind 18550 points
    Hello,
    LM3279 cannot be used for 2G applications because of the need for big and fast load step transitions. In addition, 2G requires peak load current in the 2.5A range and LM3279 is not rated for such high load current as it was designed only for 3G/4G applications.
    Our LM3248 device (a boost/buck) does support 2G operation and should fit your application.

    Regards,

    Liaqat