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AS3643

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

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.

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).

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.

If a different output capacitor is chosen, ensure similar ESR values and at least 4.2µF capacitance at 5V output volt-

age.

Table 22. Recommended Input Capacitor

Part Number

C

TC Code

Rated

Voltage

Size

Manufacturer

GRM188R60J106ME47

10µ

>3µF@4.5V

>2µF@5.25V

X5R

6V3

0603

Murata

www.murata.com

LMK107BBJ106MA

10µ

>3µF@4.5V

X5R

6V3

0603

Taiyo Yuden

www.t-yuden.com

Table 23. Recommended Output Capacitor

Part Number

C

TC Code

Rated

Voltage

Size

Manufacturer

GRM219R61A116U

10µF +/-10%

>4.2µF@5V

X5R

10V

0805

Murata

www.murata.com

GRM188R60J106ME84

1

1. Use only for VLED < 3.75V

10µF +/-20%

>4.2µF@4V

X5R

6.3V

0603

(1.6x0.8x0.85mm

max. 0.95mm

height)