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How does a BST pin function?
DC/DC Switching RegulatorsFunction
The BST pin is necessary for DC/DC converters with a bootstrap circuit.
A bootstrap circuit generates the gate drive voltage for a high-side N-channel driver by constructing a boost charge pump circuit utilizing switching operations of a DC/DC converter.*
- *An N-channel driver has higher driving capability than a P-channel driver. Therefore, the driver size can be small compared with a P-channel driver.
By connecting a capacitor (CBST) between the BST and Lx pins, the voltage between the two pins is regulated to 5 V typically.
When the Lx voltage is low, the CBST is charged. Then, when the BST voltage exceeds the Lx voltage by 5 V, the N-channel driver can be driven.
Any types of capacitors are available as CBST, if the capacitance is equal or more than the recommended value.
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