TPS60310, TPS60311, TPS60312, TPS60313

SINGLE-CELL TO 3-V/3.3-V, 20-mA DUAL OUTPUT,

HIGH-EFFICIENCY CHARGE PUMP WITH SNOOZE MODE

SLVS362A – MAY 2001 – REVISED AUGUST 2001

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

design procedure

capacitor selection

The TPS6031X devices require only five external capacitors. Their values are closely linked to the required

output current and the output noise and ripple requirements. It is possible to only use 1-

µF capacitors of the

same type.

The input capacitor improves system efficiency by reducing the input impedance and stabilizing the input

current.

maximum allowed output ripple voltage, larger values can be chosen. Table 1 shows capacitor values

recommended for low output voltage ripple operation. A recommendation is given for the smallest size.

Table 1. Recommended Capacitor Values for Low-Output Voltage Ripple Operation

VIN

[V]

IO(OUT2)

[mA]

CIN

[

µF]

CXF

[

µF]

COUT

[

µF]

VP–P

[mV]

AT 20 mA/

[V]

[mA]

CERAMIC

CERAMIC

CERAMIC

AT 20 mA/

VIN = 1.1 V

0.9...1.8

0

…20

1

1

1

16

0.9

…1.8

0

…20

1

1

2.2

10

0.9

…1.8

0

…20

1

1

10 // 0.1

6

Table 2. Recommended Capacitors

MANUFACTURER

PART NUMBER

SIZE

CAPACITANCE

TYPE

Taiyo Yuden

UMK212BJ104MG

LMK212BJ105KG

LMK212BJ225MG

JMK316BJ475KL

0805

0805

0805

1206

0.1

µF

1

µF

2.2

µF

4.7

µF

Ceramic

Ceramic

Ceramic

Ceramic

AVX

0805ZC105KAT2A

1206ZC225KAT2A

0805

1206

1

µF

2.2

µF

Ceramic

Ceramic

Table 3 lists the manufacturers of recommended capacitors. However, ceramic capacitors will provide the

lowest output voltage ripple due to their typically lower ESR.

Table 3. Recommended Capacitor Manufacturers

MANUFACTURER

CAPACITOR TYPE

INTERNET

Taiyo Yuden

X7R/X5R ceramic

www.t-yuden.com

AVX

X7R/X5R ceramic

www.avxcorp.com

Vishay

X7R/X5R ceramic

www.vishay.com

Kemet

X7R/X5R ceramic

www.kemet.com

TDK

X7R/X5R ceramic

www.component.tdk.com