BQ25570 Reference Design Circuit | Buck Converter Application Circuit

The BQ25570 is a highly integrated energy harvesting nanopower management solution that is ideally suited to meet the specific needs of ultra-low power applications. This article mainly introduces the BQ25570 features, application range, reference design circuit and circuit analysis to help you shorten the design time.

BQ25570 features: ultra low power DC / DC boost charger; battery charging and protection; battery normal output flag; programmable buck regulator output (buck)

Typical application range of BQ25570: solar charger; low power wireless monitoring; environmental monitoring; portable and wearable health devices

BQ25570 reference design application circuit:

Figure 1BQ25570 internal structure diagram

The product is specifically designed to efficiently acquire and manage the microwatts (μW) to milliwatts (mW) of Power generated from a variety of DC sources like photovoltaic (solar) or thermal electric generators.

Figure 2BQ25570 reference design

Thebq25570 also implements a programmable maximum power point tracking sampling network to optimize the transfer of power into the device. The fraction of open circuit voltage that is sampled and held can be controlled by pulling VOC_SAMP high or low (80% or 50% respectively) or By using external resistors.

BQ25570 Datasheet: Click to download

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