AS3630 datasheet(62/72 Pages) AMSCO

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AS3630 – 62

8A Supercap Flash Driver

Output Capacitor CDCDC1, CDCDC2

Low ESR capacitors should be used to minimize VDCDC ripple

and therefore current ripple on the LED. Multi-layer ceramic

capacitors are recommended since they have extremely low

ESR and are available in small footprints. The capacitor should

be located as close to the device as is practical.

X5R dielectric material is recommended due to their ability to

maintain capacitance over wide voltage and temperature

range.

Figure AS3630 – 48:

Recommended DCDCs Capacitor

If a different output capacitor is chosen, ensure similar ESR

values and at least 4.2μF capacitance at 5V output voltage and

for CDCDC1 10V voltage rating, CDCDC2 6.3V voltage rating.

Inductor LDCDC1

LDCDC1 is used for charging of the Supercap, operate the LED in

torch and PWM operation and in parallel to LDCDC2 to power the

LED during flash. Due to the different durations of the operation

modes, different peak current limits apply (see Figure 49).

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 ILDCCD113. The inductor should have very

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

DCR values will reduce efficiency.

Part Number

TC Code

Voltage

Size

Manufacturer

GRM219R61A106ME47

10μF ±20%

>4.8μF@5V

X5R

10V

0805

(2.0x1.25x0.85mm

max 1mm height)

Murata

www.murata.com

GRM219R61A106ME441

1. If TAMB<70ºC or higher output voltage ripple can be tolerated.

10μF ±10%

>4.05μF@5V

2 x C2012X5R1A106M2

2. Use 2 in parallel for CDCDC1 and CDCDC2 to reach the required output capacitor of >4.2μF capacitance at 5V.

10μF ±20%

X5R

10V

2x0805

(2.0x1.25x0.85mm

max 0.95mm

height)

TDK

www.tdk.com

13. Can be adjusted in I²C mode with register coil1_peak

AS3630 Datasheet(PDF) 62 Page - ams AG

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