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参数资料
型号： AS1301A-BWLT
厂商： AUSTRIAMICROSYSTEMS AG
元件分类： DC/DC变换器
英文描述： 5V/50mA Inductorless Boost; Package Type: CS-WLP(1.5x1.5)-8
中文描述： 5V/50mA低噪声电感升压转换器
封装： CS-WLP(1.5x1.5)-8
文件页数： 12/16页
文件大小： 1145K
代理商： AS1301A-BWLT
wwwaustriamcrosystems.com/DC-DC_Step-Up/AS1301
Revision 1.05
12 - 16
AS1301
Datasheet - Application Information
9 Application Information
9.1 External Component Selection
The high internal oscillator frequency of 1MHz permts the use of small capacitors for both, the flying capacitors and the output capacitors. For
any given load value of the flying- and output capacitors as well as their ESR are affecting the output voltage performance.
In general, the capacitor’s ESR is inversely proportional to its physical size. Larger capacitances and higher voltage ratings tend to reduce ESR.
The ESR is a function of the frequency too, so it must be rated at the devices operating frequency. Another factor affecting capacitor ESR is
temperature.
Note:
Many capacitors have a huge capacity variation over temperature. This can be compensated by choosing a capacitor with a better ther-
mal coefficient or by choosing a larger nomnal value to ensure proper operation over temperature.
9.2 Input and Output Capacitor Selection
It is not critical which type of input bypass capacitor C
BAT
and output filter capacitor C
OUT
is used, but it will affect the performance of the charge
pump. Low ESR capacitors should be used to mnimze V
OUT
ripple. Multi-layer ceramc capacitors are recommended since they have
extremely low ESR and are available in small footprints.
Input Capacitor.
An 2.2μF input bypass low ESR capacitor such as tantalumor ceramc is recommended to reduce noise and supply
transients. During startup and mode change it supplies part of the peak input current drawn by the device.
Output Capacitor.
The output capacitor is charged to the V
OUT
voltage during pumping phase. The ESR of the output capacitor introduces
steps in the output voltage waveformwhenever the charge pump charges C
OUT
. These steps contribute to the ripple voltage of V
OUT
.
Therefore, ceramc or tantalumlow ESR capacitors are recommended for C
OUT
to mnimze the output voltage ripple.
9.3 Flying Capacitor Selection
To ensure the required output current and avoid high peak currents the values of the flying capacitors C
FLY
1
and C
FLY
2
are very critical. A 220nF
capacitor is sufficient for most applications. Dependent on the operation mode the AS1301 alternately charges and discharges C
FLY
1/2
. Since
the flying capacitors lead a higher current than the output capacitor the ESR of C
FLY
1/2
has a greater impact on the performance of the whole
system The voltage drop caused by the ESR of the flying capacitors directly adds to the output source resistance of the charge pump.
Therefore low ESR capacitors, e.g. tantalumor ceramc, are recommended for the flying capacitors as well.
Table 4. Recommended Input and Output Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
GRM21BR71A225KA01
2.2μF
X7R
10V
2x1.2x1.35mm
Murata
wwwmurata.com
Table 5. Recommended Flying Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
GRM188R71E224KA88
220nF
X7R
25V
1.6x0.8x0.87mm
Murata
相关PDF资料
PDF描述
AS1302-BWLT 5V/30mA Inductorless Boost
AS1322A-BTTT Adj., 315mA, 1.2 MHz, Boost; Package Type: TSOT23-6; Miscellaneous: Operation; Miscellaneous: with Automatic Powersave
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