MAX828, MAX829

http://onsemi.com

13

0

14.0

12.0

20

10

10.0

8.0

2.0

30

40

6.0

Figure 40. Tripler Load Regulation,

Output Voltage vs. Output Current MAX828

A

B

C

D

A

3.0

1N4148

B

3.0

MBRA120E

Curve

Diodes

110

96.5

MAX828

C

5.0

1N4148

D

5.0

MBRA120E

84.5

78.2

111

96.7

MAX829

87.3

77.1

020

10

30

40

Figure 41. Tripler Load Regulation,

Output Voltage vs. Output Current MAX829

A

B

C

D

4.0

14.0

12.0

10.0

8.0

2.0

6.0

4.0

+

5

4

2

3

1

OSC

MAX828 Capacitors = 10

mF

MAX829 Capacitors = 3.3

mF

5

4

2

3

1

OSC

+

+

+

Figure 42. Paralleling Devices for Increased Negative Output Current

An increase in converter output current capability with a reduction in output resistance can be obtained by paralleling two

or more devices. The output current capability is approximately equal to the number of devices paralleled. A single shared

output capacitor is sufficient for proper operation but each device does require it’s own pump capacitor. Note that the output

ripple frequency will be complex since the oscillators are not synchronized. The output resistance is approximately equal to

the output resistance of one device divided by the total number of devices paralleled. The performance characteristics for a

converter consisting of two paralleled devices is shown below.