STBB1-AXX Datasheet, PDF (17/24 Pages) STMicroelectronics – Buck-boost DC-DC converter

STBB1-AXX
Application information
I_{PEAK – BUCK} = ^IOUT/
+
---^V-----^O-----^U----^T------------⁽---^V----^I--^N----^M-----^A---^X-----^–-----^V----^O------^U-- ^T)
2 _VINMAX fs L
equation 5
I_{PEAK – BOOST} = ^V-----^O-----^U----_VT----_I--_N----^I_M--^O---_I-_N-^U---^T- + ^V-----^I--^N----^M---₂--^I-^N-------_V----_O-^V----_U-^O----_T-^U----^T-----_f-^–-_s---^V----^I--_LN-----^M----^I--^N----
where h is the estimated efficiency of the STBB1-AXX. The maximum of the two values
above must be considered when the inductor is selected.
8.3
Input and output capacitor selection
Ceramic capacitors should be with low ESR in order to filter any disturbance present in the
input line and to obtain stable operation. Minimum values of 10 µF for both capacitors are
needed to achieve good behavior of the device.
The input capacitor has to be placed as closer as possible to the device.
DocID022197 Rev 4
17/24