AN2390 datasheet(35/42 Pages) STMICROELECTRONICS

35 / 42 page

AN2390

Conclusion: a low-cost flexible solution

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Conclusion: a low-cost flexible solution

Everything on the evaluation board has been designed to make it easy to adapt in any way

(to other types of battery, new behavior specifications, additional design constraints, etc.).

●

The demo is developed with an ST72324L microcontroller device but you can choose

another MCU device if you so desire.

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Because of the flexibility of the MCU, you can modify the firmware for wide variety of

applications and this is well supported by the flexible non inverting buck boost converter

which can adapt to different supply voltages. For example, you could easily make a

USB charger to charge a 4.2 V Li-ion battery.

●

The firmware is developed in ‘C’ language. So it is easily upgradeable.

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The number of components needed for each slot (charging and feedback) is minimal,

so replacing them is inexpensive.

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The code size is approximately 3 Kbytes. The current firmware supports Li-ion and

NiMh battery chemistry but it can be easily converted to charge other battery

chemistries, for example to charge SLA batteries.

●

ST’s low cost PNP and NPN transistors and diodes are used to implement this

converter which makes it even more cost-effective.

AN2390 Datasheet(PDF) 35 Page - STMicroelectronics