BQ24617: How to avoid entering sleep mode when using 5V adapter?

Jamie Tseng

Intellectual 2405 points

Part Number: BQ24617
Other Parts Discussed in Thread: BQ25606

Hi Teams,

My customer applies BQ24617 in their project.

The use case is Lithium battery 1S3P with charge voltage 4.35V/ charge current 3A.

They have two kinds of input voltage,12VIN and 5VIN.

When Vin=12V, everything goes well.

But when Vin=5V, the BQ24617 stop charging until the battery is discharged.

We know that BQ2461X series Vcc must be at least 500mV higher than SRN to avoid entering sleep mode.

Due to the customer must have 5V and 12V input voltage in their application, do you have any suggestions to solve this problem?

If BQ24617 cannot meet this requirement, could you kindly recommend a suitable device for this application?

Thanks and best regards,

Jamie

over 5 years ago

0 Kedar Manishankar over 5 years ago

TI__Mastermind 24075 points

Hi Jamie,

As BQ24617 is a charge controller, customer has more flexibility in choosing external components as well as layout. It is critical to minimize trace length (impedance) between adapter plug in and VCC of the IC, and to account for voltage drop across the input reverse blocking FETs (minimize RDSon of these PFETs). When monitoring for SLEEP mode, measure VCC and SRN as close to IC as possible. If you are looking for standalone part you can take a look at BQ25606 as well which is more integrated.

0 Jamie Tseng over 5 years ago in reply to Kedar Manishankar

TI__Intellectual 2405 points

Hi Kedar,

I'll send you the layout file and schematic privately, could you kindly help on how to improve the voltage drop and let the device not to enter sleep mode when 5VIN?

Thanks and best regards,

Jamie

0 Kedar Manishankar over 5 years ago in reply to Jamie Tseng

TI__Mastermind 24075 points

Thread resolved offline.

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BQ24617: How to avoid entering sleep mode when using 5V adapter?