AS1330 データシートの表示（PDF） - austriamicrosystems AG
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AS1330 Datasheet PDF : 18 Pages
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AS1330
Datasheet - Application Information
Component Selection
Only three power components are required to complete the design of the boost converter, except the additional two resistors for the voltage
divider to set VOUT. The high operating frequency and low peak currents of the AS1330 allow the use of low value, low profile inductors and tiny
external ceramic capacitors.
Inductor Selection
The inductor should have low ESR to reduce the I²R power losses, and must be able to handle the peak inductor current without saturating.
High-frequency ferrite core inductor materials reduce frequency dependent power losses compared to less expensive powdered iron types,
which result in improved converter efficiency.
lid A 1µH inductor with a >850mA current rating and low DCR is recommended. For applications where radiated noise is a concern, a toroidal or
shielded inductor can be used.
Capacitor Selection
a A 4.7µF capacitor is recommended for C1 and for C2. Small-sized ceramic capacitors are recommended. X5R and X7R ceramic capacitors are
v recommended as they retain capacitance over wide ranges of voltages and temperatures.
Output Capacitor Selection
ill Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low
ESR and are available in small footprints. Up to 10µF output capacitor is sufficient for most applications. Larger values up to 22µF may be used
to obtain extremely low output voltage ripple and improve transient response.
t An additional phase lead capacitor may be required with output capacitors larger than 10µF to maintain acceptable phase margin. X5R and X7R
dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
G s Input Capacitor Selection
A t Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are
recommended for input decoupling and should be located as close to the device as is practical. A 4.7µF input capacitor is sufficient for most
s n applications. Larger values may be used without limitations.
Table 4. Recommended External Components
m te Name
a n C1,C2
l co L1
Part Number
GRM219R60J106KE19
GRM188R60J475KE19
LQH32PN1R0NN0
LQH32PNR47NN0
EPL2010-102ML
EPL2010-821ML
EPL2010-471ML
Value
10µF
4.7µF
1µH
470nH
1µH
820nH
470nH
Rating
6.3V
6.3V
2.05A
2.55A
1.35A
1.6A
2.2A
Type
X5R
X5R
45mΩ
30mΩ
99mΩ
68mΩ
40mΩ
Size
0805
0603
3.2x2.5x1.55mm
3.2x2.5x1.55mm
2.0x2.0x1.0mm
2.0x2.0x1.0mm
2.0x2.0x1.0mm
Manufacturer
Murata
www.murata.com
Coilcraft
www.coilcraft.com
ica Diode Selection
n A Schottky diode should be used to carry the output current for the time it takes the PMOS synchronous rectifier to switch on. For VOUT > 3.0V
a schottky diode is mandatory, for VOUT ≤ 3.0V a it is optional, although using one will increase device efficiency by 2 to 3%. On one hand the
schottky diode reduces the overshoot on the output signal but on the other hand the output disconnect function is no longer working.
Tech Note: Do not use ordinary rectifier diodes, since the slow recovery times will compromise efficiency.
www.austriamicrosystems.com/DC-DC_Step-Up/AS1330
Revision 1.06
13 - 17
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