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

15

POST OFFICE BOX 655303

APPLICATION INFORMATION

OUT1

5

+

C(OUT1)

1

µF

OUT2

6

+

C(OUT2)

1

µF

OUTPUT

3.3 V, 20 mA

R1

10

PG

VIN

3

CIN

1

µF

INPUT

0.9 V to 1.8 V

1

EN

OFF/ON

GND

9

TPS60300

PG

7

8

C2F

1

µF

C2+

C2–

C1+

C1–

C1F

1

µF

4

2

+

Figure 20. Typical Operating Circuit

For the maximum output current and best performance, five ceramic capacitors of 1

µF are recommended. For

lower currents or higher allowed output voltage ripple, other capacitors can be used. It is recommended that the

input and output capacitors have a minimum value of 1

µF. This value is necessary to assure a stable operation

of the system due to the linear mode. With flying capacitors lower than 1

µF, the maximum output power will

decrease. This means that the device will work in the linear mode with lower output currents.

output filter design

The power-good output is capable of driving light loads up to 5 mA (see Figure 21). Therefore, the output

resistance of the power-good pin, in addition with an output capacitor, can be used as an RC-filter.

_

+

Charge Pumps,

Logic and Control

C1F

C1+

C1–

_

+

Vref

C2+

C2–

C2F

OUT2

C(OUT2)

OUT1

C(OUT1)

PG

CPG

R(PG1)

R(PG0)

GND

VIN

EN

Figure 21. TPS60302, TPS60303 Push-Pull Power-Good Output-Stage as Filtered Supply