www.austriamicrosystems.com/AS3642

1.2-2

21 - 26

AS3642

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

If a different inductor is chosen, ensure similar DCR values and at least 0.7µH inductance at 0.9A input current.

LED

Use LED and optics as required by the system.

PCB Layout Guideline

The high speed operation requires proper layout for optimum performance. Route the power traces first and try to min-

imize the area and wire length of the two high frequency/high current loops:

At the pin GND a single via (or more vias, which are closely combined) connects to the common ground plane. This

via(s) will isolate the DCDC high frequency currents from the common ground (as most high frequency current will flow

between Loop1 and Loop2 and will not pass the ground plane) - see the ‘ground via’ in Figure 24.

CIG21K1R0SCE

1.17µH

135m



>0.7µH

2x1.25x0.9mm

Samsung Electro-

Mechancs

www.sem.samsung.co.kr

CKP2012N1R0M

1.0µH

110m



>0.7µH

2x1.25x0.9mm

Taiyo Yuden

www.t-yuden.com

MLP2012L1R0MT

1.0µH

>0.7µH

2x1.25x0.9mm

TDK

www.tdk.com

MDT2012-CR1R0AN

1.0µH

110m



>0.7µH

2x1.25x0.9mm

Toko

www.toko.co.jp

Table 13. Recommended LEDs

Part Number

Name

Lumen @ 300mA

Size

Manufacturer

CERAMOS LUW

C9SM

Ceramos

55

2.04x1.64x0.75mm Osram Opto Semiconductors

www.osram-os.com

LXCL-PWF3

Luxeon PWF3

30

2.04x1.64x0.7mm

Philips Lumileds

www.philipslumileds.com

Table 12. Recommended Inductor (Continued)

Part Number

L

DCR

L @ 0.9A

Size

Manufacturer