AS1301A-BWLT austriamicrosystems, AS1301A-BWLT Datasheet - Page 12

• Manufacturer Part Number: AS1301A-BWLT
• Description: IC BOOST/SW CAP 5V 50MA 8WLCSP
• Manufacturer: austriamicrosystems
• Type: Step-Up (Boost), Switched Capacitor (Charge Pump)r

Specifications of AS1301A-BWLT

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 50mA
• Frequency - Switching: 1MHz
• Voltage - Input: 2.7 ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: AS1301A-BWLTTR

AS1301
Datasheet - 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
9.1 External Component Selection
The high internal oscillator frequency of 1MHz permits 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-
9.2 Input and Output Capacitor Selection
It is not critical which type of input bypass capacitor C
pump. Low ESR capacitors should be used to minimize V
extremely low ESR and are available in small footprints.
Input Capacitor.
transients. During startup and mode change it supplies part of the peak input current drawn by the device.
Output Capacitor.
steps in the output voltage waveform whenever the charge pump charges C
Therefore, ceramic or tantalum low ESR capacitors are recommended for C
Table 4. Recommended Input and Output Capacitor
9.3 Flying Capacitor Selection
To ensure the required output current and avoid high peak currents the values of the flying capacitors C
capacitor is sufficient for most applications. Dependent on the operation mode the AS1301 alternately charges and discharges C
the flying capacitors lead a higher current than the output capacitor the ESR of C
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. tantalum or ceramic, are recommended for the flying capacitors as well.
Table 5. Recommended Flying Capacitor
www.austriamicrosystems.com/DC-DC_Step-Up/AS1301
GRM21BR71A225KA01
GRM188R71E224KA88
mal coefficient or by choosing a larger nominal value to ensure proper operation over temperature.
Part Number
Part Number
An 2.2µF input bypass low ESR capacitor such as tantalum or ceramic is recommended to reduce noise and supply
The output capacitor is charged to the V
2.2µF
220nF
C
C
TC Code
TC Code
BAT
X7R
X7R
and output filter capacitor C
OUT
OUT
ripple. Multi-layer ceramic capacitors are recommended since they have
Rated Voltage
voltage during pumping phase. The ESR of the output capacitor introduces
Revision 1.05
Rated Voltage
10V
25V
OUT
OUT
. These steps contribute to the ripple voltage of V
to minimize the output voltage ripple.
FLY1/2
OUT
has a greater impact on the performance of the whole
Dimensions (L/W/T)
Dimensions (L/W/T)
is used, but it will affect the performance of the charge
2x1.2x1.35mm
1.6x0.8x0.87mm
FLY1
and C
FLY2
Murata
www.murata.com
Murata
www.murata.com
are very critical. A 220nF
Manufacturer
Manufacturer
FLY1/2
OUT
.
. Since
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