STBB1XX STMicroelectronics, STBB1XX Datasheet - Page 14

• Manufacturer Part Number: STBB1XX
• Description: 1 A, high efficiency single inductor dual mode buck-boost DC-DC converter
• Manufacturer: STMicroelectronics

Specifications of STBB1XX

• Typical Efficiency: > 94 %

Application information
8.3
14/21
The minimum inductor value for the application is the higher between
Equation 3
handle must be calculated in order to avoid saturation.
Equation 4
Equation 5
Where η is the estimated efficiency of STBB1. The maximum of the two values above must
be considered when selecting the inductor.
Input and output capacitor selection
It is recommended to use ceramic capacitors with low ESR as input and output capacitors 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 must be placed as close as possible to the device.
I
I
PEAK
PEAK
−
−
BOOST
BUCK
. In addition to the inductance value the maximum current the inductor can
=
=
I (
VOUT
OUT
η
×
VIN
/
η
×
)
I
MIN
+
OUT
VOUT
+
2
VIN
Doc ID 15474 Rev 5
×
×
VIN
MIN
(
2
VIN
×
MAX
×
VOUT
(
MAX
VOUT
×
fs
−
×
VOUT
×
fs
−
L
VIN
×
L
)
MIN
)
Equation 2
STBB1XX
and