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The saturation current I SATURATION should be chosen to be above the maximum value of I LIMIT . The inductor should
have very low DC resistance (DCR) to reduce the I R power losses - high DCR values will reduce efficiency.
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 L DCDC
The fast switching frequency (4MHz) of the AS3647/47B allows for the use of small SMDs for the external inductor.
11
2
Table 24. Recommended Inductor
2.0A
3.0A
1.5A (2.0A)
2.5A
3.0A
Part Number
C3-P1.5R
LQM32PN1R0MG0
LQM2HPN1R0MGC
CIG32W1R0MNE
NRH2412T1R0N
CKP3225N1R0M
MAMK2520T1R0M
L
1.5μH
1.0μH
>0.6μH @ 3.0A
1.0μH
>0.6μH @ 2.0A
1.0μH
>0.7μH @ 2.7A
>0.6μH @ 3.0A
1.0μH
>0.6μH @ 2.5A
1.0μH
>0.6μH @ 3.0A
1.0μH
>0.6μH @ 2.75A
DCR
58m ?
60m ?
100m ?
60m ?
+/-25%
77m ?
<60m ?
45m ?
I SATURATION
2.4A@25oC,
1
2
3
3.0A
4
3.0A
5
Size
3x3x1.5mm
(height is
max.)
3.2x2.5x0.9
mm
max 1.0mm
height
2.5x2.0x0.9
mm
max 1.00mm
height
3.2x2.5mm
max 1.0mm
height
2.4x2.4x1.2
mm (height
is max.)
3.2x2.5x0.9
mm
max 1.0mm
height
2.5x2.0x1.2
mm
height is max
Manufacturer
Mitsumi
www.mitsumi.com
Murata
www.murata.com
Samsung Electro-
Mechancs
www.sem.samsung.co.kr
Taiyo Yuden
www.t-yuden.com
MDMK2020T1R0M
1.0μH
>0.6μH @ 2.75A
56m ?
2.55A
6
2.0x2.0x1.2
mm
height is max
2.0A
MAKK2016T1R0M
1.0μH
>0.6μH @ 2.75A
65m ?
7
2.0x1.6x1.0
mm
height is max
11.Can be adjusted in I C mode with register coil_peak (see page 24)
1. Do not exceed maximum I SATURATION - can be ensured by setting coil_peak (will limit LED current)
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. Set current limit to 2A ( coil_peak =00b) - will limit maximum output current.
Flash cycle limit: 150ms on, 500ms off; repeat maximum 50 times.
4. Set current limit to 2.5A ( coil_peak =01b) - will limit maximum output current.
5. Set current limit to 3.0A ( coil_peak =10b) - can limit maximum output current.
6. Set current limit to 2.5A ( coil_peak =01b) - will limit maximum output current.
7. Set current limit to 2A ( coil_peak =00b) - will limit maximum output current.
If a different inductor is chosen, ensure similar DCR values and at least0.6μH inductance at I LIMIT .
2
www.austriamicrosystems.com/AS3647
1.5-4
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