CAT661 データシートの表示（PDF） - ON Semiconductor

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CAT661

High Frequency 100 mA CMOS Charge Pump, Inverter/Doubler

ON Semiconductor 

CAT661

Capacitor Suppliers

The following manufacturers supply low−ESR capacitors:

Table 6. CAPACITOR SUPPLIERS

Manufacturer

Capacitor Type

AVX/Kyocera

TPS/TPS3

Vishay/Sprague

595

Sanyo

MV−AX, UGX

Nichicon

F55

HC/HD

Phone

843−448−9411

402−563−6866

619−661−6835

847−843−7500

WEB

www.avxcorp.com

www.vishay.com

www.sanyo.com

www.nichicon−us.com

Email

avx@avxcorp.com

−

Svcsales@sanyo.com

−

Comments

Tantalum

Aluminum

Aluminum

Tantalum

Aluminum

Capacitor manufacturers continually introduce new series and offer different package styles. It is recommended that before

a design is finalized capacitor manufacturers should be surveyed for their latest product offerings.

Controlling Loss in CAT661 Applications

There are three primary sources of voltage loss:

1. Output resistance:

VLOSS = ILOAD x ROUT, where ROUT is the

CAT661 output resistance and ILOAD is the load

current.

2. Charge pump (C1) capacitor ESR:

VLOSSC1 ≈ 4 x ESRC1 x ILOAD, where

ESRC1 is the ESR of capacitor C1.

3. Output or reservoir (C2) capacitor ESR:

VLOSSC2 = ESRC2 x ILOAD, where ESRC2 is

the ESR of capacitor C2.

Increasing the value of C2 and/or decreasing its ESR will

reduce noise and ripple.

The effective output impedance of a CAT661 circuit is

approximately:

Rcircuit [ Rout 661 ) (4 ESRC1) ) ESRC2

http://onsemi.com

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