STBB1XX Datasheet, PDF (6/20 Pages) STMicroelectronics – Buck-boost DC-DC converter

Typical application
4
Typical application
Figure 3. Application circuit adjustable version
L
VIN
CIN
SW1
VIN
SW2
VINA
VOUT
STBB1 -A
EN
FB
MODE/SYN
GND
PGND
VOUT
COUT
R1
R2
STBB1xx
Figure 4. Application circuit fixed output voltage
L
VIN
CIN
SW1
VIN
SW2
VINA
VOUT
STBB1 -XX
EN
FB
MODE/SYN
GND
PGND
VOUT
COUT
Table 5. List of external components ⁽¹⁾
Component
Manufacturer
Part number
Value
Size
CIN
Murata
GRM188R60J106ME47D
10 µF
0603
COUT
Murata
GRM188R60J106ME47D
10 µF
0603
L
TDK
VLCF4020T-2R2N1R7
2.2 µH
4 x 4 x 2 mm
R1
560 kΩ (V_O = 3.3 V)
(2)
0402
R2
100 kΩ
0402
1. Above listed components refer to typical application. Operation of the STBB1 is not limited to the choice of these external
components.
2. R1 and R2 are calculated according to the following formula.
R1 = R2 x (VOUT/VFB - 1).
Suggested value for R2 is 100 kΩ. In order to reduce the quiescent current a maximum value of 500 kΩ is possible.
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