TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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5.4.4 External Circuit for Fixed Switching Regulator 0
Switching regulator 0 is an internal buck switching regulator and generates a fixed 3.3V supply with approx-
imately 500mA. This 3.3V supply shall be used to power VCCIO and PLLCLK_VCCIO. This regulator comes
with an integrated Schottky diode which minimizes part count, when an external 5V supply is available.
This 3.3V can also be used to power other on-board devices, e.g., EEPROM or LEDs. The 3.3V rail is available
at switching regulator 0 output SW0.
More information on the switching regulators is given in Section 7.21.
VS=5V
TMC8462
VS0
SW0
22µH
3.3V out
SW_DIODE
GND_DIODE
22µF
47µF
GND0
Figure 21: External circuit for switching regulator 0 with VS0 = 5V
VS>5V
TMC8462
VS0
SW0
22µH
3.3V out
SW_DIODE
GND_DIODE
22µF
47µF
GND0
Figure 22: External circuit for switching regulator 0 with VS0 > 5V
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