CAT660
100mA CMOS Charge Pump Inverter/Doubler
FEATURES
s
Replaces MAX660 and LTC®660
s
Converts V+ to V- or V+ to 2V+
s
Low output resistance, 4
Ω
typical
s
High power efficiency
s
Selectable charge pump frequency
s
Low quiescent current
H
GEN
FR
ALO
EE
LE
A
D
F
R
E
E
TM
s
Pin-compatible, high-current alternative to
7660/1044
s
Industrial temperature range
s
Available in 8-pin SOIC and DIP packages
- 10kHz or 80kHz
- Optimize capacitor size
- Lead-free, halogen-free package option
APPLICATIONS
s
Negative voltage generator
s
Voltage doubler
s
Voltage splitter
s
Low EMI power source
s
GaAs FET biasing
s
Lithium battery power supply
s
Instrumentation
s
LCD contrast bias
s
Cellular phones, pagers
DESCRIPTION
The CAT660 is a charge-pump voltage converter. It will
invert a 1.5V to 5.5V input to a -1.5V to -5.5V output. Only
two external capacitors are needed. With a guaranteed
100mA output current capability, the CAT660 can replace
a switching regulator and its inductor. Lower EMI is
achieved due to the absence of an inductor.
In addition, the CAT660 can double a voltage supplied
from a battery or power supply. Inputs from 2.5V to 5.5V
will yield a doubled, 5V to 11V output voltage.
A Frequency Control pin (BOOST/FC) is provided to
select either a high (80kHz) or low (10kHz) internal
oscillator frequency, thus allowing quiescent current vs.
capacitor size trade-offs to be made. The 80kHz
frequency is selected when the FC pin is connected to
V+. The operating frequency can also be adjusted with
an external capacitor at the OSC pin or by driving OSC
with an external clock.
Both 8-pin DIP and SOIC packages are available in the
industrial temperature range.
The CAT660 replaces the MAX660 and the LTC660.
In addition, the CAT660 is pin compatible with the 7660/
1044, offering an easy upgrade for applications with
100mA loads.
TYPICAL APPLICATION
+VIN
1.5V to 5.5V
1
BOOST/FC
C1
+
V+
OSC
LV
OUT
8
7
6
5
Inverted
Negative
Output
Voltage
C1
+
1
BOOST/FC
2
CAP+
CAT660
V+
OSC
LV
OUT
8
7
6
5
Doubled
Positive
Output
Voltage
2
CAP+
3
GND
4
CAP-
CAT660
3
GND
4
CAP-
VIN = 2.5V to 5.5V
VOLTAGE INVERTER
POSITIVE
VOLTAGE DOUBLER
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5000, Rev. W
CATALYST [ CATALYST SEMICONDUCTOR ]
