Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21
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VSx
SWx
VREG3V3_FB
SAW_FREQ[1..0]
PMOS
Driver
SAW
oscillator
IMAX
Set
S
R
Q
Undervolt
1

MOSFET
Dutycycle limit
VS
VDD5_OUT
Bandgap
and 5V
auxiliary
regulator
VDD5_INx
Switch reg supply
1.2V Ref
SC_DISABLE
VOUT_DISABLE
SC_DETECT
C
FB
FB_CAP[1..0]
R
FB
FB_AMPL[1..0]
Soft Start
Circuit
250k
Sum
Amplifier &
Compa-
rator
+
+
-
VOUT1_FB
Reg. 1 only
0→
1.2V
1.2V Ref
Disable
UV
VOUT_DISABLE (Reg. 1) /
Overtemp (3.3V Reg.)
SW0_DIODE
GND0_DIODE
3.3VRegulatoronly
0.8A Schottky
92k53k
SWx_IN
VOUT1_DAMP
Reg. 1 only
Dampening
Circuit
+VIO
CSW
L
SW
CSWE
R
V1
R
V2
470nF
SW regulator output
+VS
100nF
100nF
Regulator 1 /
3.3V Regulator
Figure 52: Internal schematic and external components for both switching regulators
Input voltage Output voltage L
SW
C
SW
5V 3.3V 15µH 22µF
24V 3.3V to 12V 68µH 47µF
35V 3.3V to 25V 68µH 47µF
Table 210: Switching regulator component selection for L and C
Info
The capacitor can either be a ceramic type, or an electrolytic low-ESR capacitor in
parallel to a 1µF or larger ceramic capacitor.
7.21.3 Analog Block Status Register
MFC IO Register 59 HV_ANA_STATUS provides various status flags on the actual state of the analog block.
This includes:
• short to ground and short to supply detection for the HV IOs
• high voltage detection flags for the HV IOs
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