STBB1PUR Datasheet, PDF (6/21 Pages) STMicroelectronics – 1 A, high efficiency single inductor

Typical application
4
Typical application
Figure 3. Application circuit - adjustable output version
L
VIN
CIN
SW1
VIN
SW2
VINA
VOUT
STBB1PUR
EN
FB
MODE/SYN
GND
PGND
VOUT
COUT
R1
R2
STBB1XX
Figure 4. Application circuit - fixed output version
L
VIN
CIN
SW1
VIN
SW2
VINA
VOUT
STBB1PUR33
EN
FB
MODE/SYN
GND
PGND
VOUT
COUT
Table 5. List of external components ⁽¹⁾
Component
Manufacturer
Part number
Value
Size
CIN
COUT
L
R1
R2
Murata
Murata
TDK
GRM188R60J106ME47D
GRM188R60J106ME47D
VLCF4020T-2R2N1R7
560 kΩ (V_O = 3.3 V)
100 kΩ
10 µF
10 µF
2.2 µH
(2)
0603
0603
4 x 4 x 2 mm
0402
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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Doc ID 15474 Rev 5