MAX660 datasheet(7/11 Pages) NSC

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Application Information (Continued)

TABLE 2. Low ESR Capacitor Manufacturers

Manufacturer

Phone

FAX

Capacitor Type

Nichicon Corp.

(708)-843-7500

(708)-843-2798

PL, PF series, through-hole aluminum electrolytic

AVX Corp.

(803)-448-9411

(803)-448-1943

TPS series, surface-mount tantalum

Sprague

(207)-324-4140

(207)-324-7223

593D, 594D, 595D series, surface-mount tantalum

Sanyo

(619)-661-6835

(619)-661-1055

OS-CON series, through-hole aluminum electrolytic

Other Applications

PARALLELING DEVICES

Any number of MAX660s can be paralleled to reduce the output resistance. Each device must have its own pumping capacitor

1, while only one output capacitor Cout is needed as shown in Figure 5. The composite output resistance is:

CASCADING DEVICES

Cascading the is an easy way to produce a greater negative voltage (as shown in

Figure 6). If n is the integer representing the

number of devices cascaded, the unloaded output voltage V

out is (−nVin). The effective output resistance is equal to the weighted

sum of each individual device:

DS100898-32

FIGURE 4. Output Source Resistance vs Oscillator Frequency

DS100898-7

FIGURE 5. Lowering Output Resistance by Paralleling Devices

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