CMOS Monolithic Voltage Converter

8

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The following is a list of manufacturers who provide

low-ESR electrolytic capacitors:

Cascading Devices

To produce larger negative multiplication of the initial

supply voltage, the MAX660 may be cascaded as

shown in Figure 3. The resulting output resistance is

approximately equal to the sum of the individual

an integer representing the number of devices cascad-

Paralleling Devices

Paralleling multiple MAX660s reduces the output resis-

tance. As illustrated in Figure 4, each device requires

its own pump capacitor C1, but the reservoir capacitor

C2 serves all devices. The value of C2 should be

increased by a factor of n, where n is the number of

devices. Figure 4 shows the equation for calculating

output resistance.

3

4

2

C1n

3

4

88

2

5

C1

C2

C2n

5

MAX660

"n"

MAX660

"1"

Figure 3. Cascading MAX660s to Increase Output Voltage

3

4

2

C1n

3

4

8

8

2

5

C1

C2

MAX660

"n"

5

n (NUMBER OF DEVICES)

MAX660

"1"

Figure 4. Paralleling MAX660s to Reduce Output Resistance

Manufacturer/

Series

Phone

Fax

Comments

AVX TPS Series

(803) 946-0690

(803) 626-3123

Low-ESR

tantalum SMT

AVX TAG Series

(803) 946-0690

(803) 626-3123

Low-cost

tantalum SMT

Matsuo 267 Series

(714) 969-2491

(714) 960-6492

Low-cost

tantalum SMT

Sprague 595

Series

(603) 224-1961

(603) 224-1430

Aluminum elec-

trolytic thru-hole

Sanyo MV-GX

Series

(619) 661-6835

(619) 661-1055

Aluminum elec-

trolytic SMT

Sanyo CV-GX

Series

(619) 661-6835

(619) 661-1055

Aluminum elec-

trolytic thru-hole

Nichicon PL

Series

(847) 843-7500

(847) 843-2798

Low-ESR

tantalum SMT

United Chemi-Con

(Marcon)

(847) 696-2000

(847) 696-9278

Ceramic SMT

TDK

(847) 390-4373

(847) 390-4428

Ceramic SMT