AS1310
Datasheet - Application Information
Table 4. Recommended Inductors
Part Number
L
DCR
Current Rating
0.54A
Dimensions (L/W/T)
3.2x2.5x1.55 mm
3.0x3.0x1.1 mm
4.0x4.0x1.1 mm
Manufacturer
LQH32CN6R8M53L
LQH3NPN6R8NJ0L
LQH44PN6R8MJ0L
6.8µH
6.8µH
6.8µH
250mΩ
210mΩ
143mΩ
Murata
www.murata.com
0.7A
0.72A
9.5 Capacitor Selection
The convertor requires three capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage
over temperature. The VIN capacitor should be 22µF. The VOUT capacitor should be between 22µF 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 VOUT. See Table 5
for a list of capacitors for input and output capacitor selection.
Table 5. Recommended Input and Output Capacitors
Part Number
C
TC Code
X5R
Rated Voltage
6.3V
Dimensions (L/W/T)
0805, T=1.25mm
1206, T=1.6mm
Manufacturer
GRM21BR60J226ME99
GRM31CR61C226KE15
GRM31CR60J475KA01
22µF
22µF
47µF
Murata
www.murata.com
X5R
16V
X5R
6.3V
1206, T=1.6mm
On the pin REF a 10nF capacitor with an Insulation resistance >1GΩ is recommended.
Table 6. Recommended Capacitors for REF
Insulation
Resistance
Rated
Voltage
Part Number
C
TC Code
Dimensions (L/W/T)
Manufacturer
GRM188R71C104KA01
GRM31CR61C226KE15
100nF
100nF
X7R
X7R
>5GΩ
>5GΩ
16V
0603, T=0.8mm
0805, T=1.25mm
Murata
www.murata.com
50V
9.6 Layout Considerations
Relatively high peak currents of 480mA (max) circulate during normal operation of the AS1310. Long printed circuit tracks can generate
additional ripple and noise that mask correct operation and prove difficult to “de-bug” during production testing. Referring to Figure 1, the input
loop formed by C1, VIN and GND pins should be minimized. Similarly, the output loop formed by C2, VOUT and GND should also be minimized.
Ideally both loops should connect to GND in a “star” fashion. Finally, it is important to return CREF to the GND pin directly.
www.austriamicrosystems.com/DC-DC_Step-Up/AS1310
Revision 1.8
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AMSCO [ AMS(艾迈斯) ]
