ST STM32F4 Series

DocID026304 Rev 3 9/44
AN4488 Power supplies
43
Figure 1. Power supply scheme
1. Optional. If a separate, external reference voltage is connected on V
REF+
, the two capacitors (100 nF and
1 µF) must be connected.
2. V
CAP2
is not available on all packages. In that case, a single 4.7 µF (ESR < 1Ω) is connected to V
CAP1
3. V
REF+
is either connected to V
REF+
or to V
DDA
(depending on package).
4. V
REF-
is either connected to V
REF-
or to V
SSA
(depending on package).
5. N is the number of V
DD
and V
SS
inputs.
6. Refer to section “Voltage regulator” in datasheet (Table 1) to connect BYPASS_REG and PDR_ON pins.
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