LM2765

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SNVS070C – MARCH 2000 – REVISED MAY 2013

CAPACITOR SELECTION

As discussed in the Positive Voltage Doubler section, the output resistance and ripple voltage are dependent on

the capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the

output resistance, and the power efficiency is

(3)

switch on-resistance, the two external capacitors and their ESRs.

output voltage ripple, and the converter efficiency. 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

Other Applications

PARALLELING DEVICES

Any number of LM2765s can be paralleled to reduce the output resistance. Each device must have its own

output resistance is:

(4)

Figure 14. Lowering Output Resistance by Paralleling Devices

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