Datasheet

TPS60300, TPS60301, TPS60302, TPS60303
SINGLE-CELL TO 3.0-V/3.3-V, 20-mA DUAL OUTPUT,
HIGH-EFFICIENCY CHARGE PUMP
SLVS302A – DECEMBER 2000 – REVISED MARCH 2001
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
design procedure
capacitor selection
The TPS6030x 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.
The minimum required capacitance of the output capacitor (C
O
) that can be selected is 1 µF. Depending on the
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
V
IN
[V]
I
O(OUT2)
[mA]
C
IN
[µF]
C
XF
[µF]
C
OUT
[µF]
V
P–P
[mV]
@ 20 mA/
[V] [mA]
CERAMIC CERAMIC CERAMIC
@ 20 mA/
V
IN = 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