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PDF CAT661 Data sheet ( Hoja de datos )
| Número de pieza | CAT661 | |
| Descripción | High Frequency 100 mA CMOS Charge Pump | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT661
High Frequency 100 mA
CMOS Charge Pump,
Inverter/Doubler
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 100 mA 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 2.5 V to 5.5 V will yield a
doubled, 5 V to 11 V output.
A Frequency Control pin (BOOST/FC) is provided to select either a
high (typically 135 kHz) or low (25 kHz) internal oscillator frequency,
thus allowing quiescent current vs. capacitor size trade−offs to be made.
The 135 kHz 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 ON 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 100 mA loads.
Features
• Converts V+ to V− or V+ to 2V+
• Low Output Resistance, 10 W Max.
• High Power Efficiency
• Selectable Charge Pump Frequency of 25 kHz or 135 kHz;
Optimize Capacitor Size
• Low Quiescent Current
• Pin−compatible to MAX660, LTC660 with Higher Frequency
Operation
• Available in 8−pin SOIC and DIP Packages
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Negative Voltage Generator
• Voltage Doubler
• Voltage Splitter
• Low EMI Power Source
• GaAs FET Biasing
• Lithium Battery Power Supply
• Instrumentation
• LCD Contrast Bias
• Cellular Phones, Pagers
© Semiconductor Components Industries, LLC, 2010
May, 2010 − Rev. 11
1
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SOIC−8
V SUFFIX
CASE 751BD
PDIP−8
L SUFFIX
CASE 646AA
PIN CONFIGURATION
1
BOOST/FC
V+
CAP+
OSC
GND
LV
CAP−
OUT
(Top View)
MARKING DIAGRAMS
661ELA
661EVA
661ELA = CAT661ELA
661EVA = CAT661EVA or
660EVA = CAT661EVA−T3
ORDERING INFORMATION
Device
Package
Shipping
CAT661ELA
CAT661EVA
PDIP−8
(Pb−Free)
SOIC−8
(Pb−Free)
50 / Tube
100 / Tube
CAT661EVA−T3
SOIC−8
3,000 /
(Pb−Free) Tape & Reel
Publication Order Number:
CAT661/D
1 page  
CAT661
TYPICAL OPERATING CHARACTERISTICS
5.0 1.0
4.8 0.8
4.6 0.6
4.4
4.2
4.0
0 20 40 60 80 100
LOAD CURRENT (mA)
Figure 8. Inverted Output Voltage vs. Load,
V+ = 5 V
50
0.4
V+ = 3 V
0.2 V+ = 5 V
0
0
200
20 40 60 80
LOAD CURRENT (mA)
Figure 9. Output Voltage Drop vs. Load
Current
100
40 160
30 120 FC = V+
20
FC = Open
80
10 40
0
12 3 4 5
SUPPLY VOLTAGE (V)
Figure 10. Oscillator Frequency vs. Supply
Voltage
6
10,000
No Load
1,000
0
1 2 3 4 56
SUPPLY VOLTAGE (V)
Figure 11. Oscillator Frequency vs. Supply
Voltage
100
V+ = 5 V
90
V+ = 3 V
80
70
100 60
10
1 10 100 1,000
OSCILLATOR FREQUENCY (kHz)
Figure 12. Supply Current vs. Oscillator
Frequency
50
40
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
Figure 13. Efficiency vs. Load Current
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5
5 Page 
CAT661
Typical Applications
Voltage Inversion Positive−to−Negative
The CAT661 easily provides a negative supply voltage from a positive supply in the system. Figure 24 shows a typical circuit.
The LV pin may be left floating for positive input voltages at or above 3.3 V.
NC
+
C1
CAT661
1 BOOST/FC
2 CAP+
3 GND
4 CAP−
V+ 8
OSC 7
LV 6
OUT 5
VIN
1.5 V to 5.5 V
C2
+
VOUT = −VIN
Figure 24. Voltage Inverter
Positive Voltage Doubler
The voltage doubler circuit shown in Figure 25 gives VOUT = 2 x VIN for input voltages from 2.5 V to 5.5 V.
1N5817*
VIN
2.5 V to 5.5 V
C1 +
150 mF
CAT661
1 BOOST/FC
2 CAP+
3 GND
4 CAP−
V+
OSC
LV
OUT
8
7
6
5
*SCHOTTKY DIODE IS FOR START−UP ONLY
Figure 25. Voltage Doubler
+ VOUT = 2VIN
C2
150 mF
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11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CAT661.PDF ] | |
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