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BQ24610: BQ24610: 5 Cells bat charger from USB PD 20V

Shlomi Yehezkia
Mastermind 6150 points
Part Number: BQ24610

Hi Team,

I would like to design 5 Cells bat charger from USB PD 20V.

Consist on the flowing parts: TPS65982, BQ24610

1: Are these parts remommended for my application.

2: For Prof of consept I need Evaloation boards for both parts

As I have seen in TI Web: TPS65982 EVM Does not have the native hardware to support the 5, 9, 15 and 20V rails. Do you have anather Evaloation board that can help?

TI BU recommend using the TPS65987D for my application as it is our latest PD3.0 controller. The TPS65987EVM supports 5V, 9V, 15V, and 20V rails natively.

My Application: Battery Charger that get its power from of the shelf Power USB power PD 20V.

I shell be only Upstream Facing Port (UFP) device Sink. No need for DRP, The external PS shell be the host.

My application deal only with the USB no need to support the data USB Data signals.

 

Battery is made of INR18650-25R from Samsung (datasheet attached).

 

 S= series

P=Parallel

5S1P

Chemistry

Li Ion Samsung

Cell Model

INR18650-25R

Voltage (nominal)

18V

Capacity (Nominal)

2.5Ah 
(60% at 20A discharge)

Pack Power [Wh]

45

Cycles

200-250

Number of cells

5

.

 

Allowed Current are: 0.5A up to 1.25A.

Cut off current at end of charge is 100mA.

Pre charge can be 100mA as well.

 

  1. Please Go over our Block Diagram What do you think ? 
  2. Do you see any problem to charge 5 Cells of that battery from USB 20V?

 

Thanks,

Shlomi

Block Diagram 251018.pdf

130109_INR18650-25R Cell SPEC (3) (1).pdf

  • 0
    TI__Guru 57341 points
    Shlomi,

    This is battery charger support. BQ24610 may support your application depending on the system design. The charger is basically a step-down DC-DC (buck) converter. It requires the input voltage to be higher than the output voltage with some headroom for normal operations. Please refer to the paper below for the details. Users should avoid maximum duty ratio operations in their designs.

    Extract maximum power from the supply when charging a battery
    www.ti.com/.../slyt569.pdf

    It is highly recommended to get familiar with the BQ24610 charger system by testing the BQ24610 EVM first (www.ti.com/.../BQ24610EVM) before working on your own board.

    Please submit separate forum message for TPS65892 support.

    Thanks,

    Ning.
    Please click "This Resolved my issue" button if this post answer your question.