TPS60200, TPS60201, TPS60202, TPS60203

REGULATED 3.3 V, 100-mA LOW-RIPPLE CHARGE PUMP

LOW POWER DC/DC CONVERTERS

SLVS274 – MARCH 2000

13

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

TPS60200

PEAK OUTPUT CURRENT

vs

INPUT VOLTAGE

150

100

50

0

1.6

2.0

2.4

2.8

200

250

350

3.2

3.6

300

VI – Input Voltage – V

Figure 17

APPLICATION INFORMATION

capacitor selection

The TPS6020x devices require only four external capacitors to achieve a very low output voltage ripple. The

capacitor values are closely linked to the required output current. Low ESR (< 0.1

Ω) capacitors should be used

at input and output. In general, the transfer capacitors (C1 and C2) will be the smallest, a 1

µF value is

recommended for maximum load operation. With smaller capacitor values, the maximum possible load current

is reduced and the LinSkip threshold is lowered.

The input capacitor improves system efficiency by reducing the input impedance. It also stabilizes the input

current of the power source. The input capacitor should be chosen according to the power supply used and the

as the flying capacitors C1 and C2.

capacitance is 2.2

µF. Larger values will improve the load transient performance and will reduce the maximum

output ripple voltage.

Only ceramic capacitors are recommended for input, output, and flying capacitors. Depending on the material

used to manufacture them, ceramic capacitors might lose their capacitance over temperature and voltage.

Ceramic capacitors of type X7R or X5R material will keep their capacitance over temperature and voltage,

whereas Z5U or Y5V-type capacitors will decrease in capacitance. Table 2 lists recommended capacitor values.