CAT660_07 Datasheet, PDF (9/16 Pages) Catalyst Semiconductor – 100mA CMOS Charge Pump Inverter/Doubler

CAT660
CAPACITOR SUPPLIERS
The following manufacturers supply low-ESR capacitors:
Manufacturer Capacitor Type Phone
AVX/Kyocera TPS/TPS3
843-448-9411
Vishay/Sprague 595
402-563-6866
Sanyo
MV-AX, UGX 619-661-6835
Nichicon
F55
847-843-7500
HC/HD
WEB
Email
Comments
www.avxcorp.com [e-mail] Tantalum
www.vishay.com
—
Aluminum
www.sanyo.com
[e-mail] Aluminum
www.nichicon-us.com
—
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 CAT660 APPLICATIONS
There are three primary sources of voltage loss:
1. Output resistance
VLOSSΩ = ILOAD x ROUT, where ROUT is
the CAT660 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 CAT660 circuit is
approximately:
Rcircuit ≈ Rout 660 + (4 x ESRC1) + ESRC2
9
Doc. No. MD-5000, Rev. W