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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
9 Application Information
External Components
Input Capacitor C VIN
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic
capacitors are required for input decoupling and should be located as close to the device as is practical.
Table 22. Recommended Input Capacitor
Part Number
GRM188R60J106ME47
LMK107BBJ106MA
C
10μ
>3μF@4.5V
>2μF@5.25V
10μ
>3μF@4.5V
TC Code
X5R
X5R
Rated
Voltage
6V3
6V3
Size
0603
0603
Manufacturer
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
If a different input capacitor is chosen, ensure similar ESR value and at least 3μF capacitance at the maximum input
supply voltage. Larger capacitor values (C) may be used without limitations.
Add a smaller capacitor in parallel to the input pin VIN (e.g. Murata GRM155R61C104, >50nF @ 3V, 0402 size).
Output Capacitor C VOUT
Low ESR capacitors should be used to minimize VOUT ripple. 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.
Table 23. Recommended Output Capacitor
Part Number
GRM219R61A116U
C
10μF +/-10%
>4.2μF@5V
TC Code
X5R
Rated
Voltage
10V
Size
0805
Manufacturer
GRM188R60J106ME84
1
10μF +/-20%
>4.2μF@4V
X5R
6.3V
0603
(1.6x0.8x0.85mm
max. 0.95mm
height)
Murata
www.murata.com
1. Use only for VLED < 3.75V
If a different output capacitor is chosen, ensure similar ESR values and at least 4.2μF capacitance at 5V output volt-
age.
www.austriamicrosystems.com/AS3647
1.5-4
30 - 37
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