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PDF CAT661 Data sheet ( Hoja de datos )
| Número de pieza | CAT661 | |
| Descripción | High Frequency 100mA CMOS Charge Pump / Inverter/Doubler | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT661 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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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, 10Ω max.
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
1 page  
CAT661
www.DataTSYhePetI4CUA.coLmOPERATING CHARACTERISTICS
Inverted Output voltage vs. Load, V+ = 5V
5.0
4.8
4.6
4.4
4.2
4.0
0
20 40 60 80
LOAD CURRENT [mA]
100
Oscillator Frequency vs. Supply Voltage
50
40
30
20 FC = Open
10
0
12 34 56
SUPPLY VOLTAGE [V]
Output Voltage Drop vs. Load Current
1.0
0.8
0.6
0.4
0.2
0.0
0
V+ = 3V
V+ = 5V
20 40 60 80
LOAD CURRENT [mA]
100
Oscillator Frequency vs. Supply Voltage
200
160
120 FC = V+
80
40
0
12 34 56
SUPPLY VOLTAGE [V]
Supply Current vs. Oscillator Frequency
10000
1000
NNooLoad
Ld
100
10
1 10 100 1000
OSCILLATOR FREQUENCY [KHz]
Efficiency vs. Load Current
100
90
80
70
60
50
40
0
V+ =5V
V+ = 3V
50
LOAD CURRENT [mA]
100
5 Doc. No. MD-5003, Rev. K
5 Page 
CAT661
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POSITIVE VOLTAGE DOUBLER
The voltage doubler circuit shown in figure 9 gives VOUT = 2 x VIN for input voltages from 2.5V to 5.5V.
1N5817*
VIN
2.5V to 5.5V
1
BOOST/FC
8
V+
27
+
CAP+
OSC
3 CAT661 6
GND
LV
4
CAP-
5
OUT
*SCHOTTKY DIODE IS FOR START-UP ONLY
+
Figure 9: Voltage Doubler
VOUT = 2VIN
PRECISION VOLTAGE DIVIDER
A precision voltage divider is shown in figure 10. With load currents under 100nA, the voltage at pin 2 will be within
0.002% of V+/2 .
+
V+
2
+
0.002%
IL < 100nA
+
1 BOOST/FC
V+ 8
2 CAP+
OSC 7
3
CAT661
GND
LV 6
4 CAP-
OUT 5
V+
3V to 11V
Figure 10: Precision Voltage Divider (Load ≤ 100nA)
11 Doc. No. MD-5003, Rev. K
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet CAT661.PDF ] | |
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