2.2 F

m

C

IN

V

IN

2.2 F

m

2.2 F

m

C

OUT

+

-

0.22 F

m

C

P1

REG710-3.3

REG710-3

REG71050

REG710-5

3.3V

3.0V

5.0V

EN

GND

V

IN

V

OUT

0.22 F

m

C

P2

EN

GND

V

IN

V

OUT

1.8V

REG71050, REG71055, REG710

SBAS221H – DECEMBER 2001 – REVISED OCTOBER 2015

www.ti.com

9.3 System Examples

9.3.1 1.8 V to 5.0 V With 10-mA Output Current

The REG710 family of charge pumps can be cascaded to reach higher output voltages, as shown in Figure 21.

Figure 21. REG710 Circuit for Step-Up Operation From 1.8 V to 5 V With 10-mA Output Current

This application circuits operates from 1.8 V input voltage and generates 5 V output voltage supporting 10 mA

load current.

Higher output voltages can be achieved when two REG710 devices are connected in cascade. When cascading

two devices from the REG710 family, the relationship between output current and input voltage must be taken

into account. (see Electrical Characteristics). In this case, REG710 can deliver a maximum of 10 mA. REG710-

3.3 or REG710-3 can be used. A second charge pump, REG71050 or REG710-5, steps up the voltage from 3 V

or 3.3 V to 5 V. Connect both Enable pins together.

14

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