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LI- POLYMER CHARGER

eli
Guru 13485 points
Other Parts Discussed in Thread: BQ24072T

looking for buttery charger for 1cell, li-polymer, 4.2V,0.5A with USB and power path.

needed to be with very low power consumption

  • 0
    TI__Guru**** 166086 points

    I suggest bq24072T.

  • 0 in reply to Jeff F
    Guru 13485 points

    Hi,

    See below and advise:

    1)      In the BQ12072 there is an option to connect the battery thermistor in order to monitor the temperature.

         As I use battery with low capacity and the current from Vin to GND in the TS input can drain the battery (see figure below):

     

    I would like to know what is the current there?

    Is there a device without this option (for example from microchip - MCP73831)?

  • 0 in reply to eli
    TI__Guru**** 166086 points

    Although not shown in the block diagram, Q1's body diode (not shown in the block diagram) blocks current from flowing from BAT through Q2 back to VIN when no input source is connected.  Therefore current will only flow through TS's internal resistor divider when the input source is attached.  The current is on the order of 10uA-100uA.