AS1310 datasheet(23/30 Pages) AMSCO

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[v1-11] 2015-Jan-28

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AS1310 − Application Information

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 Figure 23 for a list of

capacitors for input and output capacitor selection.

Figure 23:

Recommended Input and Output Capacitors

On the pin REF a 10nF capacitor with an Insulation resistance

>1G

Ω is recommended.

Figure 24:

Recommended Capacitors for REF

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 2, 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.

Part Number

Code

Rated

Voltage

Dimensions

(L/W/T)

Manufacturer

GRM21BR60J226ME99

22μF

X5R

6.3V

0805, T=1.25mm

Murata

www.murata.com

GRM31CR61C226KE15

22μF

X5R

16V

1206, T=1.6mm

GRM31CR60J475KA01

47μF

X5R

6.3V

1206, T=1.6mm

Part Number

Code

Insulation

Resistance

Rated

Voltage

Dimensions

(L/W/T)

Manufacturer

GRM188R71C104KA01

100nF

X7R

>5G

16V

0603,

T=0.8mm

Murata

www.murata.com

GRM31CR61C226KE15

100nF

X7R

>5G

50V

0805,

T=1.25mm

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