AS3630 datasheet(63/72 Pages) AMSCO

63 / 72 page

8A Supercap Flash Driver

AS3630 – 63

Figure AS3630 – 49:

Recommended Inductor

If a different inductor is chosen, ensure similar DCR values and

at least0.6μH inductance at ILDCCD1 set by coil1_peak.

Inductor LDCDC2

LDCDC2 is used in parallel to LDCDC1 to power the LED during

flash. The whole current from the Supercap flows through

LDCDC2 therefore a high power inductor is required.

The fast switching frequency (4MHz) of the AS3649 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 ILDCCD214. The inductor should have very

low DC resistance (DCR) to reduce the I2R power losses - high

DCR values will reduce efficiency

Part Number

DCR

max. coil1_peak

setting for

Size

Manufacturer

Other modes

Flash

LQM32PN1R0MG0

1.0μH

>0.6μH @

3.0A

60m

2.0A

3.0A1

1. 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)

3.2x2.5x0.9mm

max 1.0mm

height

Murata

www.murata.com

SPM3012T-1R0M

1.0μH

±20%

57m

±10%

2.5A

3.0A

(3.5A2)

2. Check with coil supplier

3.2x3x1.2

height is max

TDK

www.tdk.com

CIG32W1R0MNE

1.0μH

>0.7μH @

2.7A

>0.6μH @

3.0A

60m

±25%

2.0A

3.0A

3.2x2.5mm

max 1.0mm

height

Samsung

Electro-Mechancs

www.sem.samsun

g.co.kr

CKP3225N1R0M

1.0μH

>0.6μH @

3.0A

<60m

1.0A

3.0A3

3. Check with coil supplier for worst case flash pattern.

3.2x2.5x0.9mm

max 1.0mm

height

Taiyo Yuden

www.t-yuden.com

MAMK2520T1R0M

1.0μH

>0.6μH@

2.75A

45m

2.5A

2.5x2.0x1.2mm

height is max

14. Can be adjusted in I²C mode with register coil2_peak

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