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dungeonlords789
dungeonlords789
Associate III
November 12, 2021
Question

L6470/powerstep01 charge pump

  • November 12, 2021
  • 1 reply
  • 1396 views

How I can calculate capacitors and diode for charge pump? Can I use schematic (charge pump part) from powerstep01 to L6470?

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1 reply

Cristiana SCARAMEL
Cristiana SCARAMEL
Technical Moderator
November 17, 2021

Hello @dungeonlords789​,

the charge pump circuitry values have been chosen according to the power stage integrated in the device.

In the device datasheet you can find the recommended values for both device (the same used in the evaluation board)

  • powerSTEP01 47 nF on CP and 470 nF between VBOOT and VS.
  • L6470 10 nF on CP and 220 nF between VBOOT and VS.

The capacitors voltage rating may vary according to the rating of the application.

Due to the high charge pump frequency, fast diodes are required. The BAR43SFILM - small signal Schottky diode - can be used for both ICs.

Let me know if I fully answered your question, if so please "Select as Best" button.

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