Datasheet

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SLVS273− FEBRUARY 2000
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
capacitor selection (continued)
Table 2. Recommended Capacitor Values
I
O
(mA)
C
i
(µF)
C
(xF)
(µF)
C
o
(µF)
V
PP
TYP
(mV)
0 − 50 4.7 2.2 4.7 40
0 − 100 4.7 2.2 10 40
0 − 100 4.7 2.2 22 18
If the measured output voltage ripple is too high for the application, improvements can be made. The first step
is to increase the capacitance at the output. If the ripple is still too high, the second step would be to increase
the capacitance at the input. For lower output currents, lower value flying capacitors can be used. Tables 3 and
4 lists the manufacturers of recommended capacitors.
Table 3. Recommended Capacitors
MANUFACTURER PART NUMBER CAPACITANCE CASE SIZE TYPE
Taiyo Yuden
LMK212BJ105KG−T 1 µF 0805 Ceramic
Taiyo Yuden
LMK212BJ225MG−T 2.2 µF 0805 Ceramic
LMK316BJ475KL−T 4.7 µF 1206 Ceramic
LMK325BJ106MN−T 10 µF 1210 Ceramic
LMK432226MM−T 22 µF 1812 Ceramic
AVX
0805ZC105KAT2A 1 µF 0805 Ceramic
AVX
1206ZC225KAT2A 2.2 µF 1206 Ceramic
NOTE: Case code compatibility with EIA 535BAAC and CECC30801 molded chips.
Table 4. Recommended Capacitor Manufacturers
MANUFACTURER CAPACITOR TYPE INTERNET SITE
Taiyo Yuden X7R/X5R ceramic http://www.t−yuden.com/
AVX X7R/X5R ceramic http://www.avxcorp.com/