AS3647 datasheet(32/38 Pages) AMSCO

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AS3647/47B

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

Inductor LDCDC

The fast switching frequency (4MHz) of the AS3647/47B allows for the use of small SMDs for the external inductor.

The saturation current ISATURATION should be chosen to be above the maximum value of ILIMIT

11. The inductor should

have very low DC resistance (DCR) to reduce the I

2R power losses - high DCR values will reduce efficiency.

If a different inductor is chosen, ensure similar DCR values and at least0.6µH inductance at ILIMIT.

11.Can be adjusted in I

2C mode with register coil_peak (see page 24)

Table 24. Recommended Inductor

Part Number

DCR

ISATURATION

Size

Manufacturer

C3-P1.5R

1.5µH

58m



2.4A@25ºC,

2.0A

1. Do not exceed maximum ISATURATION - can be ensured by setting coil_peak (will limit LED current)

3x3x1.5mm

(height is

max.)

Mitsumi

www.mitsumi.com

LQM32PN1R0MG0

1.0µH

>0.6µH @ 3.0A

60m



3.0A

2. Flash pattern: 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again (no limit on the number of total cycles)

Alternative pattern with 1000ms/1.6A, 200ms pause, 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat

again. (no limit on the number of total cycles)

3.2x2.5x0.9

max 1.0mm

height

Murata

www.murata.com

LQM2HPN1R0MGC

1.0µH

>0.6µH @ 2.0A

100m



1.5A (2.0A)

3. Set current limit to 2A (coil_peak=00b) - will limit maximum output current.

Flash cycle limit: 150ms on, 500ms off; repeat maximum 50 times.

2.5x2.0x0.9

max 1.00mm

height

CIG32W1R0MNE

1.0µH

>0.7µH @ 2.7A

>0.6µH @ 3.0A

60m



+/-25%

3.0A

3.2x2.5mm

max 1.0mm

height

Samsung Electro-

Mechancs

www.sem.samsung.co.kr

NRH2412T1R0N

1.0µH

>0.6µH @ 2.5A

77m



2.5A

4. Set current limit to 2.5A (coil_peak=01b) - will limit maximum output current.

2.4x2.4x1.2

mm (height

is max.)

Taiyo Yuden

www.t-yuden.com

CKP3225N1R0M

1.0µH

>0.6µH @ 3.0A

<60m



3.0A

3.2x2.5x0.9

max 1.0mm

height

MAMK2520T1R0M

1.0µH

>0.6µH @ 2.75A

45m



3.0A

5. Set current limit to 3.0A (coil_peak=10b) - can limit maximum output current.

2.5x2.0x1.2

height is max

MDMK2020T1R0M

1.0µH

>0.6µH @ 2.75A

56m



2.55A

6. Set current limit to 2.5A (coil_peak=01b) - will limit maximum output current.

2.0x2.0x1.2

height is max

MAKK2016T1R0M

1.0µH

>0.6µH @ 2.75A

65m



2.0A

7. Set current limit to 2A (coil_peak=00b) - will limit maximum output current.

2.0x1.6x1.0

height is max

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