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参数资料
型号： AS1331-BTDT-AD
厂商： AUSTRIAMICROSYSTEMS AG
元件分类： DC/DC变换器
英文描述： 300mA Buck-Boost Converter; Package Type: TDFN(3x3)-10; Output Range: 2.5 to 3.3V
封装： TDFN(3x3)-10
文件页数： 13/16页
文件大小： 2337K
代理商： AS1331-BTDT-AD
wwwaustriamcrosystems.com/DC-DC_Buck-Boost/AS1331
Revision 1.04
13 - 16
AS1331
Datasheet - Application Information
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
OUT
programming resistors are needed. The high operating frequency and low peak currents of the AS1331
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.
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
IN
capacitor should be at least 2.2μF. The V
OUT
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
OUT
. See
Table 5
for a list of
capacitors for input and output capacitor selection.
Table 4. Recommended Inductors
Part Number
LPS3015-682M
EPL2014-682M
XPL2010-682M
L
DCR
300m
Ω
287m
Ω
336m
Ω
Current Rating Dimensions (L/W/T)
0.89A
0.80A
0.73A
Manufacturer
Coilcraft
www.coilcraft.com
6.8μH
6.8μH
6.8μH
3.0x3.0x1.5mm
2.0x2.0x1.4mm
2.0x1.9x1.0mm
Table 5. Recommended Input Capacitor
Part Number
GRM188R61A225KE34
GRM188R60J475KE19
GRM219R60J106KE19
C
TC Code
X5R
X5R
X5R
Rated Voltage
10V
6.3V
6.3V
Dimensions (L/W/T)
0603, T=0.87mm
0603, T=0.87mm
0805, T=0.95mm
Manufacturer
Murata
2.2μF
4.7μF
10μF
Table 6. Recommended Output Capacitor
Part Number
GRM21BR61A106KE19
GRM319R61A106KE19
GRM319R61A106KE19
GRM31CR61C226KE15
GRM31CR60J475ME19
C
TC Code
X5R
X5R
X5R
X5R
X5R
Rated Voltage
10V
10V
10V
16V
6.3V
Dimensions (L/W/T)
0805, T=1.35mm
1206, T=0.95mm
1210, T=0.95mm
1206, T=1.8mm
1206, T=1.75mm
Manufacturer
Murata
www.murata.com
10μF
10μF
10μF
22μF
47μF
相关PDF资料
PDF描述
AS1331-BTDT-33 300mA Buck-Boost Converter; Package Type: TDFN(3x3)-10; Output Range: 3.3V
AS1332-BWLT 650mA, RF Buck Converter, Vcon
AS1333-BWLT 650mA, RF, Buck Converter; Package Type: CS-WLP(1.5x1.5)-8; Output Range: 3.09V
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