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5V input charge 1 cell li-on battery

Knighty Nimp
Expert 1260 points
Other Parts Discussed in Thread: BQ24125, BQ24133, BQ24103, BQ24113

All,

We plan to use bq24125 to charge 1 cell Li-on battery from 5V(64%-84% duty) but we concern thermal so is there any solution from TI to do such application?

NT

  • 0 in reply to Knighty Nimp
    TI__Guru 56650 points

    Please check bq24133. It supports up to 2A.

  • 0 in reply to Wang5577
    Expert 1260 points

    Wang,

    Thanks!! Anyway, how bq24133 can improve temperature issue compare to bq24125? Only reduce RDS on both high side and low size?

    NT

  • 0 in reply to Knighty Nimp
    TI__Guru 56650 points

    bq24125 use PFET for the high side switching FETs. The two input PFETs total resistor is 400mohm.  The bq24133 use NFET and the resistor is much lower than PFET.

    Here is the comparison table, it will be available online soon.

     

    bq24103/123

    bq24113

    bq24133

    Control Scheme

    Standalone

    Host Control

    Standalone

    Package

    QFN-20, 3.5x4.5

    QFN-20, 3.5x4.5

    QFN-24, 3.5x5.5

    Maximum Current

    2A

    2A

    2.5A

    Input Voltage Range

    4.35V-16V

    4.35V-16V

    4.5V-17V

    Output Voltage

    1,2 cell, 4.2V/cell

    +/-1% (0-85C)

    1,2 cell, 4.2V/cell

    +/-1% (0-85C)

    1,2,3 cell, 4.2V/cell

    +/-0.5% (0-85C)

    Switching Frequency

    1.1MHz

    1.1MHz

    1.6MHz

    Power Path

    Management

    No

    No

    NMOS ACFET

    PMOS BATFET

    Input Current

    Regulation

    No

    No

    Yes, +/-7%

    Charge Current

    Regulation

    +/-10%

    +/-10%

    +/-5%

    Switching MOSFETs Rdson (typ)

    HS PMOS 250mohm

    LS NMOS 90mohm

    HS PMOS 250mohm

    LS NMOS 90mohm

    HS NMOS 80mohm

    LS NMOS 90mohm

    Battery Detection

    NTC + load C

    detection

    NTC + load C

    detection

    NTC + load C

    detection

    Programmable

    Input OVP

    No

    No

    Yes

    Integrated BTST Schottky Diode

    No

    No

    Yes

    Thermal Regulation

    No

    No

    Yes