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CAT661ESA Datasheet(PDF) 10 Page - Catalyst Semiconductor

Part # CAT661ESA
Description  High Frequency 100mA CMOS Charge Pump, Inverter/Doubler
PDF  16 Pages
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT661ESA Datasheet(HTML) 10 Page - Catalyst Semiconductor

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CAT661
10
Doc. No. 5003, Rev. J
CAPACITOR SUPPLIERS
The following manufacturers supply low-ESR capacitors:
Manufacturer
Capacitor Type
Phone
WEB
Email
Comments
AVX/Kyocera
TPS/TPS3
843-448-9411
www.avxcorp.com
avx@avxcorp.com
Tantalum
Vishay/Sprague 595
402-563-6866
www.vishay.com
—
Aluminum
Sanyo
MV-AX, UGX
619-661-6835
www.sanyo.com
Svcsales@sanyo.com Aluminum
Nichicon
F55
847-843-7500
www.nichicon-us.com
—
Tantalum
HC/HD
Aluminum
The effective output impedance of a CAT661 circuit is
approximately:
Rcircuit
≈ Rout 661 + (4 x ESRC1) + ESRC2
VOLTAGE INVERSION POSITIVE-TO-NEGATIVE
The CAT661 easily provides a negative supply voltage
from a positive supply in the system. Figure 8 shows a
typical circuit. The LV pin may be left floating for positive
input voltages at or above 3.3V.
Figure 8: Voltage Inverter
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.
≈
+
VOUT = -VIN
C2
1
2
3
4
8
7
6
5
CAT661
NC
+
C1
VIN
1.5V to 5.5V
BOOST/FC
CAP+
GND
CAP-
V+
OSC
LV
OUT
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.
TYPICAL APPLICATIONS



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