LI-ion USB charger that detects USB current capabilities?

Doug Hauck

Other Parts Discussed in Thread: BQ24253, BQ24250

I want to build a device that can be charged by any USB jack. The difficulty I'm having is in finding a single chip that will handle the variety of USB ports and wall wart power supplies out there: high-power SDP (Standard Downstream Port, 500mA), low power SDP (100mA), CDP (Charging Downstream Port, 900mA to 1.5A), and DCP (Dedicated Charging Port, 1.5A).

I've been looking at the BQ24075T, but it requires setting the available current via EN1 and EN2. What I'm hoping to find is a Li-ion charging chip that can recognize the type of USB jack it is plugged into (SDP, CDP or DCP) and automatically charge the battery with the maximum available current. If necessary, it should enumerate the USB port so the host allows 500mA.

Does such a chip exist?

over 10 years ago

0 Tahar Allag over 10 years ago

TI__Mastermind 28720 points

Hi,

There is also bq2425x and bq2426x for the switch mode charges.

Thanks

Tahar

0 Doug Hauck over 10 years ago in reply to Tahar Allag

Prodigy 90 points

Both the linear and the switch mode chargers are nice parts, however they require a micro to control the charge current magnitude. Is there a standalone chip available that would determine the current capabilities of the USB port that it is connected to and automatically draw that amount?

My project requires charging, but does not contain a microcontroller.

Thanks,
Doug

0 Tahar Allag over 10 years ago in reply to Doug Hauck

TI__Mastermind 28720 points

Doug,

bq24253 and 24257 are stand alone parts.

Thanks

Tahar

0 Siddalingayya CG over 10 years ago in reply to Tahar Allag

Prodigy 20 points

Hi Tahar,

I am using BQ24253 battery charger in my power supply design of Hand held device.

Device is supposed run either from DC adapter( 6V,3A) or from Lithium Ion (single 3.7V, 2.5Ahrs).

What do I do with D+ and D- of BQ24253 pins?

Let me know if I can use BQ24250 which is stand alone *** I2C controlled.

I dont have microcontroller to control the charger IC.

Thanks,

Siddu

0 Tahar Allag over 10 years ago in reply to Siddalingayya CG

TI__Mastermind 28720 points

Hi Siddu,

You can leave the D+/D- floating. But actually the bq24250 spin does not have this feature.

You can use the bq24250 without I2C, or chose a spin that does not have I2 such bq24253.

Thanks!

Tahar

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LI-ion USB charger that detects USB current capabilities?