www.austriamicrosystems.com/DC-DC_Step-Up/AS1310

Revision 1.8

15 - 19

AS1310

Datasheet - Application In formatio n

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

for a list of capacitors for input and output capacitor selection.

On the pin REF a 10nF capacitor with an Insulation resistance >1G

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.

LQH32CN6R8M53L

6.8µH

250m

Ω

0.54A

3.2x2.5x1.55 mm

Murata

www.murata.com

LQH3NPN6R8NJ0L

6.8µH

210m

Ω

0.7A

3.0x3.0x1.1 mm

LQH44PN6R8MJ0L

6.8µH

143m

Ω

0.72A

4.0x4.0x1.1 mm

Table 5. Recommended Input and Output Capacitors

Part Number

C

TC 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

Table 6. Recommended Capacitors for REF

Part Number

C

TC Code

Insulation

Resistance

Rated

Voltage

Dimensions (L/W/T)

Manufacturer

GRM188R71C104KA01

100nF

X7R

>5G

Ω

16V

0603, T=0.8mm

Murata

www.murata.com

GRM31CR61C226KE15

100nF

X7R

>5G

Ω

50V

0805, T=1.25mm

Table 4. Recommended Inductors

Part Number

L

DCR

Current Rating

Dimensions (L/W/T)

Manufacturer