as1331 austriamicrosystems, as1331 Datasheet - Page 13

• Manufacturer Part Number: as1331
• Description: 300ma Buck-boost Synchronous Dc/dc Converters
• Manufacturer: austriamicrosystems

AS1331
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Component Selection
Only three power components are required to complete the design of the buck-boost converter. For the adjustable
version V
allow the use of low value, low profile inductors and tiny external ceramic capacitors.
Inductor Selection
For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. The
inductor should have low DCR (DC resistance) to reduce the I²R losses, and must be able to handle the peak inductor
current without saturating. A 6.8µH inductor with a >600mA current rating and <400m Ω DCR is recommended.
Table 4. Recommended Inductors
Capacitor Selection
The buck-boost convertor requires two capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while
maintaining capacitance at rated voltage over temperature. The V
capacitor should be between 10µF and 47µF. A larger output capacitor should be used if lower peak to peak output
voltage ripple is desired. A larger output capacitor will also improve load regulation on V
capacitors for input and output capacitor selection.
Table 5. Recommended Input Capacitor
Table 6. Recommended Output Capacitor
www.austriamicrosystems.com
GRM31CR61C226KE15
GRM31CR60J475ME19
GRM188R61A225KE34
GRM21BR61A106KE19
GRM319R61A106KE19
GRM319R61A106KE19
GRM188R60J475KE19
GRM219R60J106KE19
LPS3015-682M
EPL2014-682M
XPL2010-682M
Part Number
Part Number
Part Number
OUT
programming resistors are needed. The high operating frequency and low peak currents of the AS1331
6.8µH
6.8µH
6.8µH
L
2.2µF
4.7µF
10µF
10µF
10µF
10µF
22µF
47µF
C
C
300m Ω
287m Ω
336m Ω
TC Code Rated Voltage
TC Code Rated Voltage
DCR
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
Revision 1.02
Current Rating Dimensions (L/W/T)
0.89A
0.80A
0.73A
6.3V
6.3V
6.3V
10V
10V
10V
10V
16V
IN
capacitor should be at least 2.2µF. The V
Dimensions (L/W/T)
Dimensions (L/W/T)
0603, T=0.87mm
0603, T=0.87mm
0805, T=0.95mm
0805, T=1.35mm
1206, T=0.95mm
1210, T=0.95mm
1206, T=1.75mm
3.0x3.0x1.5mm
2.0x2.0x1.4mm
2.0x1.9x1.0mm
1206, T=1.8mm
OUT
. See
Coilcraft
www.coilcraft.com
Murata
www.murata.com
Murata
www.murata.com
Table 5
Manufacturer
Manufacturer
Manufacturer
for a list of
OUT
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