TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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5.4.5 External Circuit for Adjustable Switching Regulator 1
Switching regulator 1 is an internal buck switching regulator and generates an adjustable supply rail with
approximately 500mA. The voltage at SW1 can be adjusted using a resistor network in the switching
regulator’s feedback path at VOUT_FB. VOUT_FB should be at 1.2V using a resistor divider. SW1 can be
used to power the high voltage IOs using VIO1, VIO2, VIO3 as well as switching regulator 0 input VS0 (which
generates a fixed 3.3V rail). SW1 can also be used to power other peripheral devices, e.g., Hall signals of a
BLDC motor or external encoders.
More information on the switching regulators is given in Section 7.21.
VS
TMC8462
VS1
22µH
adj. out
SW1
100kΩ
22µF
47µF
VOUT
4.7kΩ
VOUT_FB
GND1
Figure 23: External circuit for adjustable buck regulator
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