LM2767

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SNVS069C – FEBRUARY 2000 – REVISED MAY 2013

output voltage ripple. Low ESR capacitors (Table 1) are recommended to maximize efficiency, reduce the output

voltage drop and voltage ripple.

Table 1. Low ESR Capacitor Manufacturers

Manufacturer

Phone

Website

Capacitor Type

Nichicon Corp.

(847)-843-7500

www.nichicon.com

PL & PF series, through-hole aluminum electrolytic

AVX Corp.

(843)-448-9411

www.avxcorp.com

TPS series, surface-mount tantalum

Sprague

(207)-324-4140

www.vishay.com

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

Sanyo

(619)-661-6835

www.sanyovideo.com

OS-CON series, through-hole aluminum electrolytic

Murata

(800)-831-9172

www.murata.com

Ceramic chip capacitors

Taiyo Yuden

(800)-348-2496

www.t-yuden.com

Ceramic chip capacitors

Tokin

(408)-432-8020

www.tokin.com

Ceramic chip capacitors

PARALLELING DEVICES

Any number of LM2767s can be paralleled to reduce the output resistance. Since there is no closed loop

feedback, as found in regulated circuits, stable operation is assured. Each device must have its own pumping

resistance is:

(4)

Figure 15. Lowering Output Resistance by Paralleling Devices

CASCADING DEVICES

Cascading the LM2767s is an easy way to produce a greater voltage (A two-stage cascade circuit is shown in

Figure 16).

The effective output resistance is equal to the weighted sum of each individual device:

(5)

Note that increasing the number of cascading stages is pracitically limited since it significantly reduces the

efficiency, increases the output resistance and output voltage ripple.

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