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Output Ripple

A

B

0

V

t

2

t

1

–V+

Paralleling Devices

+

-

1

2

3

4

8

7

6

5

TL7660

"1"

1

2

3

4

8

7

6

5

TL7660

"n"

+

-

+

+

-

V+

C

1

C

2

R

L

C

1

TL7660

CMOS VOLTAGE CONVERTER

SCAS794 – JUNE 2006

APPLICATION INFORMATION (continued)

ESR also affects the ripple voltage seen at the output. The total ripple is determined by two voltages, A and B,

magnitude of this current change is 2

× I

Again, a low ESR capacitor results in a higher performance output.

Figure 4. Output Ripple

Any number of TL7660 voltage converters may be paralleled to reduce output resistance (see Figure 5). The

output resistance would be approximately:

Figure 5. Paralleling Devices

10

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