BQ24172: NiMH charging solutions

Ed Walker

Part Number: BQ24172
Other Parts Discussed in Thread: BQ2000

Hello Battery Charger team.
Split from original thread: https://e2e.ti.com/support/power-management/f/196/t/883196

Please provide some suggestions NiMH charger, deep discharge protection, disconnecting from load, automatic reset if new batteries are inserted.

At the moment I develop a new product and need some help with the power components to find the best solution.

- primary battery with 3x AA as alkaline or NiMh

over 5 years ago

0 Jeff F over 5 years ago

TI__Guru**** 166626 points

Hi Ed,

If slow charging NiMh batteries at < 0.5C rate, then using the BQ24172 safety timer (or any charger with adjustable safety timer) to terminate is okay. If fast charging at > 0.5C rate, then using the BQ24172 is not recommended unless there is an MCU with ADC to perform dV/dt or dT/dt termination. The BQ2000 is TI's only NiMh charger family that can fast charge and terminate with dV/dt or dT/dt. BQ2000 does not provide discharge protection, disconnection from load but will auto reset when new batteries are inserted.

Regards,

Jeff

0 Jing Zou over 5 years ago

TI__Mastermind 20570 points

Hi Ed,

Would you please let us know what type of EE is for? Mainly trying to understand the reason and application need for NiMH battery.

0 Ed Walker over 5 years ago in reply to Jing Zou

Prodigy 5 points

Hello Jing,
Please see the original thread.
The customer questions crossed product lines so I had to divide for the various product groups.
This is all I know.

original thread: https://e2e.ti.com/support/power-management/f/196/t/883196

You can reply to the customers original post with your questions.

0 Jim Carrillo over 5 years ago in reply to Ed Walker

TI__Genius 9148 points

Jens H - can you comment on Jing's questions above?

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BQ24172: NiMH charging solutions