LM828 datasheet(6/15 Pages) TI

6 / 15 page

LM828

SNOS035D – MARCH 2010 – REVISED MAY 2013

www.ti.com

(2)

Again, using a low ESR capacitor will result in lower ripple.

CAPACITOR SELECTION

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)

Where IQ(V+) is the quiescent power loss of the IC device, and IL

out is the conversion loss associated with the

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

The selection of capacitors is based on the specifications of the dropout voltage (which equals Iout Rout), the

output voltage ripple, and the converter efficiency. Low ESR capacitors (following table) are recommended to

maximize efficiency, reduce the output voltage drop and voltage ripple.

Low ESR Capacitor Manufacturers

Manufacturer

Phone

Capacitor Type

Nichicon Corp.

(708)-843-7500

PL & PF series, through-hole aluminum electrolytic

AVX Corp.

(803)-448-9411

TPS series, surface-mount tantalum

Sprague

(207)-324-4140

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

Sanyo

(619)-661-6835

OS-CON series, through-hole aluminum electrolytic

Murata

(800)-831-9172

Ceramic chip capacitors

Taiyo Yuden

(800)-348-2496

Ceramic chip capacitors

Tokin

(408)-432-8020

Ceramic chip capacitors

Other Applications

PARALLELING DEVICES

Any number of LM828s can be paralleled to reduce the output resistance. Each device must have its own

pumping capacitor C1, while only one output capacitor Cout is needed as shown in Figure 13. The composite

output resistance is:

(4)

Figure 13. Lowering Output Resistance by Paralleling Devices

Submit Documentation Feedback

Product Folder Links: LM828

LM828 Datasheet(PDF) 6 Page - Texas Instruments

LM828 Datasheet(HTML) 6 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Datasheet Download

Link URL