TPS60140, TPS60141

LOW POWER DC-DC CONVERTER

REGULATED 5 V, 100-mA CHARGE PUMP VOLTAGE TRIPLER

SLVS273– FEBRUARY 2000

13

POST OFFICE BOX 655303

APPLICATION INFORMATION

capacitor selection (continued)

Table 2. Recommended Capacitor Values

IO

(mA)

Ci

(

µF)

C(xF)

(

µF)

Co

(

µF)

VPPTYP

(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

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

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/