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Technology Front


Published: May 20,2021

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Holtek announced the release of its new power bank dedicated Flash MCUs, the BP45F4NB and BP45FH4NB. Using their internal complementary PWM drive function, the devices can implement full charge and discharge battery management operations. By using their fully integrated I²C, SPI and UART interfaces, the residual battery capacity and other parameters can be uploaded to a connected host controller. These features combine to make these new devices extremely suitable to meet the demands of shared power bank applications.

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The devices include an integrated 2.4V reference voltage source which has a tolerance of ±1%, over/under voltage protection (OUVP) function and over current protection (OCP) function. The A/D Converter works together with an internal voltage divider to read the battery voltage as well as the input/output voltage.

There is a four stage programmable I/O output current which can directly drive LEDs, providing savings on external components and reducing the product PCB area. The BP45FH4NB device also includes an integrated 5V LDO and two 28V Gate Drivers, which makes it suitable for use with two to six serially connected lithium batteries and for quick charging applications.

Both devices contain a flash program memory of 4K×16 and a data memory of 256×8. With regards to packaging, the BP45F4NB is supplied in 24-pin SSOP and 28-pin SSOP/QFN(4mm×4mm) package types while the BP45FH4NB is supplied in a 28-pin SSOP package type. These devices have abundant MCU peripheral resources and are suitable for products such as shared power banks, quick charging power banks and car emergency jump starters.

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