AS1325 查看數據表（PDF） - austriamicrosystems AG
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AS1325 Datasheet PDF : 17 Pages
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AS1325
Data Sheet - Application Information
Capacitor Selection
Low ESR capacitors (X5R or X7R) should be used to minimize the output voltage ripple.
COUT Selection
Choose a COUT value to achieve the desired output ripple. A 22µF ceramic capacitor is a good initial value. A larger
value for COUT can be used to further reduce ripple and improve AS1325 efficiency.
Table 6. Recommended Output Capacitor
Part Number
C1210C226K9PAK
JMK212BJ226MG-T
C
22µF ±10%
22µF ±20%
TC Code
X5R
X5R
Rated Voltage
6.3V
6.3V
Dimensions (L/W/T)
3.2x2.5x1.5mm
2x1.3x1.3mm
Manufacturer
Kemet
www.kemet.com
Taiyo Yuden
www.t-yuden.com
CIN Selection
CIN reduces the peak current drawn from the battery and can be the same value as COUT.
Table 7. Recommended Input Capacitor
Part Number
C1210C226K9PAK
GRM31CR70J106KA01L
C
22µF ±10%
10µF ±10%
TC Code
X5R
X7R
Rated Voltage
6.3V
6.3V
Dimensions (L/W/T)
3.2x2.5x1.5mm
3.2x1.6x1.6mm
Manufacturer
Kemet
www.kemet.com
Murata
www.murata.com
External Diode (5V Output only)
An external Schottky diode must be connected, in parallel with the on-chip synchronous rectifier, from LX to OUT. Use
diodes such as MBR0520L, EP05Q03L, or the generic 1N5817. The diode should be rated for 500mA, since it carries
current during startup and after the synchronous rectifier turns off. The Schottky diode must be connected as close to
the IC as possible. Ordinary rectifier diodes must not be used, since the slow recovery rate will compromise efficiency.
PC Board Layout and Grounding
Well-designed printed circuit-board layout is important for minimizing ground bounce and noise.
! Place pin GND lead and the ground leads of CIN and COUT as close to the device as possible.
! Keep the lead to pin LX as short as possible.
! To maximize output power and efficiency and minimize output ripple voltage, use a ground plane and solder the
GND pin directly to the ground plane.
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Revision 1.01
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