CAT660 Datasheet, PDF (1/16 Pages) Catalyst Semiconductor – 100mA CMOS Charge Pump Inverter/Doubler

Preliminary Information
CAT660
100mA CMOS Charge Pump Inverter/Doubler
FEATURES
ALOGEN ^FR
LEA _{D F REETM}
I Replaces MAX660 and LTC®660
I Converts V+ to V- or V+ to 2V+
I Low output resistance, 4Ω typical
I High power efficiency
I Selectable charge pump frequency
- 10kHz or 80kHz
- Optimize capacitor size
I Low quiescent current
I Pin-compatible, high-current alternative to
7660/1044
I Industrial temperature range
I Available in 8-pin SOIC, DIP and 0.8mm thin 8-
pad TDFN packages
- Lead-free, halogen-free package option
APPLICATIONS
I Negative voltage generator
I Voltage doubler
I Voltage splitter
I Low EMI power source
I GaAs FET biasing
I Lithium battery power supply
I Instrumentation
I LCD contrast bias
I 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 TDFN package has a
4x4mm footprint and features a 0.8mm maximum height.
Compared to the 8-pin SOIC the TDFN package footprint
is nearly 50% less. For die availability, contact Catalyst
Semiconductor marketing.
The CAT660 replaces the MAX660 and the LTC660.
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
C1
+
1 BOOST/FC
V+ 8
2 CAP+
CAT660
3 GND
OSC 7
LV 6
4 CAP-
OUT 5
VOLTAGE INVERTER
Inverted
Negative
Output
Voltage
C1 ⁺
VIN = 2.5V to 5.5V
1 BOOST/FC
V+ 8
2 CAP+
OSC 7
CAT660
3 GND
LV 6
4 CAP-
OUT 5
POSITIVE
VOLTAGE DOUBLER
Doubled
Positive
Output
Voltage
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5000, Rev. U