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CAT661 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT661
Beschreibung High Frequency 100mA CMOS Charge Pump / Inverter/Doubler
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 17 Seiten
CAT661 Datasheet, Funktion
www.DataSheet4U.com
CAT661
High Frequency 100mA CMOS Charge Pump, Inverter/Doubler
FEATURES
ALOGEN FR
LEA D F REETM
s Converts V+ to V- or V+ to 2V+
s Low output resistance, 10max.
s High power efficiency
s Selectable charge pump frequency of 25kHz
or 135kHz; optimize capacitor size.
s Low quiescent current
s Pin-compatible to MAX660, LTC660 with higher
frequency operation
s Available in 8-pin SOIC andDIP packages
s 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 CAT661 is a charge-pump voltage converter. It can
invert a positive input voltage to a negative output. Only
two external capacitors are needed. With a guaranteed
100mA output current capability, the CAT661 can replace
a switching regulator and its inductor. Lower EMI is
achieved due to the absence of an inductor.
In addition, the CAT661 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.
A Frequency Control pin (BOOST/FC) is provided to
select either a high (typically 135kHz) or low (25kHz)
internal oscillator frequency, thus allowing quiescent
current vs. capacitor size trade-offs to be made. The
135kHz 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 SO packages are available. For die
availability, contact Catalyst Semiconductor marketing.
The CAT661 can replace the MAX660 and the LTC660
in applications where higher oscillator frequency and
smaller capacitors are needed. In addition, the CAT661
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+
OSC 7
CAT661
3 GND
LV 6
4 CAP-
OUT 5
VOLTAGE INVERTER
Inverted
Negative
Voltage
Output
C1 +
VIN = 2.5V to 5.5V
1 BOOST/FC
V+ 8
2 CAP+ CAT661 OSC 7
3 GND
LV 6
4 CAP-
OUT 5
POSITIVE VOLTAGE DOUBLER
Doubled
Positive
Voltage
Output
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5003, Rev. K






CAT661 Datasheet, Funktion
CAT661
www.FDaigtauSrheee2t4. UT.ceosmt Circuit Voltage Doubler
V+
C1
100µF
+
V+
5V
1
BOOST/FC
8
V+
27
CAP+
OSC
3 CAT661 6
GND
LV
4 CAP-
OUT 5
10V VOUT
External
Oscillator
C2
100µF
TYPICAL OPERATING CHARACTERISTICS
Typical characteristic curves are generated using the circuit in Figure 2. Doubler test conditions are: V+ 5V, LV = GND,
BOOST/FC = Open and TA = 25˚C unless otherwise indicated.
Supply Current vs. Input Voltage (No Load)
Output Resistance vs. Input Voltage
3000
10
2500
2000
1500
1000
500
FC = V+
FC = open
8
6
4
2
0
0 12 3 45 6
INPUT VOLTAGE [V]
Supply Current vs. Oscillator Frequency
0
1 23 45 6
INPUT VOLTAGE [V]
Output Voltage Drop vs. Load Current
10000
1.0
1000
No Load
0.8
0.6
100
10
1
10 100 1000
OSCILLATOR FREQUENCY [KHz]
0.4
0.2
0.0
0
V+ = 3V
V+ = 5V
20 40 60 80
LOAD CURRENT [mA]
100
Doc. No. MD-5003, Rev. K
6

6 Page









CAT661 pdf, datenblatt
CAT661
www.BDaAtaTSThEeeRt4YU.VcoOmLTAGE SPLITTER
Positive and negative voltages that track each other can be obtained from a battery. Figure 11 shows how a 9V battery
can provide symmetrical positive and negative voltages equal to one-half the battery voltage.
BATTERY
9V
VBAT
3V < VBAT < 11V
+
1 BOOST/FC
V+ 8
2
CAP+
7
OSC
3
CAT661
GND
LV 6
4 CAP-
OUT 5
+ VBAT (4.5V)
2
-
VBAT
2
(-4.5V)
+
Figure 11: Battery Splitter
CASCADE OPERATION FOR HIGHER NEGATIVE VOLTAGES
The CAT661 can be cascaded as shown in figure 12 to generate more negative voltage levels. The output resistance
is approximately the sum of the individual CAT661 output resistance.
VOUT= -N x VIN, where N represents the number of cascaded devices.
+
C1
+VIN
8
2 CAT661
3 "1"
+
C1N
45
8
2 CAT661
3 "N"
45
+ C2 VOUT = -NVIN
+ C2
Figure 12: Cascading to Increase Output Voltage
Doc. No. MD-5003, Rev. K
12

12 Page





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