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PDF ICL7660S Data sheet ( Hoja de datos )
| Número de pieza | ICL7660S | |
| Descripción | Super Voltage Converter | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ICL7660S, ICL7660A
January 23, 2013
FN3179.7
Super Voltage Converters
The ICL7660S and ICL7660A Super Voltage Converters are
monolithic CMOS voltage conversion ICs that guarantee
significant performance advantages over other similar
devices. They are direct replacements for the industry
standard ICL7660 offering an extended operating supply
voltage range up to 12V, with lower supply current. A
Frequency Boost pin has been incorporated to enable the
user to achieve lower output impedance despite using smaller
capacitors. All improvements are highlighted in the “Electrical
Specifications” section on page 3. Critical parameters are
guaranteed over the entire commercial and industrial
temperature ranges.
The ICL7660S and ICL7660A perform supply voltage
conversions from positive to negative for an input range of
1.5V to 12V, resulting in complementary output voltages of
-1.5V to -12V. Only two non-critical external capacitors are
needed, for the charge pump and charge reservoir functions.
The ICL7660S and ICL7660A can be connected to function
as a voltage doubler and will generate up to 22.8V with a
12V input. They can also be used as a voltage multipliers or
voltage dividers.
Each chip contains a series DC power supply regulator, RC
oscillator, voltage level translator, and four output power
MOS switches. The oscillator, when unloaded, oscillates at a
nominal frequency of 10kHz for an input supply voltage of
5.0V. This frequency can be lowered by the addition of an
external capacitor to the “OSC” terminal, or the oscillator
may be over-driven by an external clock.
The “LV” terminal may be tied to GND to bypass the internal
series regulator and improve low voltage (LV) operation. At
medium to high voltages (3.5V to 12V), the LV pin is left
floating to prevent device latchup.
In some applications, an external Schottky diode from VOUT
to CAP- is needed to guarantee latchup free operation (see
Do’s and Dont’s section on page 8).
Pin Configurations
ICL7660S
(8 LD PDIP, SOIC)
TOP VIEW
BOOST 1
CAP+ 2
GND 3
CAP- 4
8 V+
7 OSC
6 LV
5 VOUT
Features
• Guaranteed Lower Max Supply Current for All
Temperature Ranges
• Wide Operating Voltage Range: 1.5V to 12V
• 100% Tested at 3V
• Boost Pin (Pin 1) for Higher Switching Frequency
• Guaranteed Minimum Power Efficiency of 96%
• Improved Minimum Open Circuit Voltage Conversion
Efficiency of 99%
• Improved SCR Latchup Protection
• Simple Conversion of +5V Logic Supply to ±5V Supplies
• Simple Voltage Multiplication VOUT = (-)nVIN
• Easy to Use; Requires Only Two External Non-Critical
Passive Components
• Improved Direct Replacement for Industry Standard
ICL7660 and Other Second Source Devices
• Pb-Free Available (RoHS Compliant)
Applications
• Simple Conversion of +5V to ±5V Supplies
• Voltage Multiplication VOUT = ±nVIN
• Negative Supplies for Data Acquisition Systems and
Instrumentation
• RS232 Power Supplies
• Supply Splitter, VOUT = ±VS
ICL7660A
(8 LD PDIP, SOIC)
TOP VIEW
NC 1
CAP+ 2
GND 3
CAP- 4
8 V+
7 OSC
6 LV
5 VOUT
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 1999, 2004, 2005, 2008, 2011, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
Functional Block Diagram
OSC
7
LV
6
OSCILLATOR
AND DIVIDE-BY-
2 COUNTER
INTERNAL SUPPLY
REGULATOR
3
ICL7660S, ICL7660A
VOLTAGE
LEVEL
TRANSLATOR
Q4
Q3
3
Q1
Q2
SUBSTRATE
LOGIC
NETWORK
3
V+
8
2 CAP+
GND
3
CAP-
4
5 VOUT
Typical Performance Curves
See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7
12 250
10
8
SUPPLY VOLTAGE RANGE
(NO DIODE REQUIRED)
6
4
200
150
100
TA = +125°C
TA = +25°C
TA = -55°C
2 50
0
-55 -25 0 25 50 100 125
TEMPERATURE (°C)
FIGURE 1. OPERATING VOLTAGE AS A
FUNCTION OF TEMPERATURE
0
02
46
8 10
SUPPLY VOLTAGE (V)
FIGURE 2. OUTPUT SOURCE RESISTANCE AS A
FUNCTION OF SUPPLY VOLTAGE
12
350
300
250
200 IOUT = 20mA,
V+ = 5V
IOUT = 3mA,
V+ = 2V
150 IOUT = 20mA,
V+ = 5V
100
50
0
-50
-25
IOUT = 20mA,
V+ = 12V
0 25 50 75 100
TEMPERATURE (°C)
FIGURE 3. OUTPUT SOURCE RESISTANCE AS A
FUNCTION OF TEMPERATURE
125
98
96 V+ = 5V
94 TA = +25°C
IOUT = 1mA
92
90
88
86
84
82
80
100 1k 10k 50k
OSC FREQUENCY fOSC (Hz)
FIGURE 4. POWER CONVERSION EFFICIENCY AS A
FUNCTION OF OSCILLATOR FREQUENCY
5 FN3179.7
January 23, 2013
5 Page 
ICL7660S, ICL7660A
V+
C1
+
-
18
2 ICL7660S 7
3 ICL7660A 6
45
-+
C2
D3
VOUT = -VIN
-
D1
C3
+
D2 VOUT = (2V+) -
(VFD1) - (VFD2)
+
-
C4
FIGURE 19. COMBINED NEGATIVE VOLTAGE CONVERTER
AND POSITIVE DOUBLER
Voltage Splitting
The bidirectional characteristics can also be used to split a
high supply in half, as shown in Figure 20. The combined
load will be evenly shared between the two sides, and a high
value resistor to the LV pin ensures start-up. Because the
switches share the load in parallel, the output impedance is
much lower than in the standard circuits, and higher currents
can be drawn from the device. By using this circuit, and then
the circuit of Figure 15, +15V can be converted, via +7.5 and
-7.5, to a nominal -15V, although with rather high series
output resistance (∼250Ω).
+
RL1 50µF -
VOUT
=
V+ -
2
V-
50µF
RL2
+
-
50µF
+
-
18
2 ICL7660S 7
3 ICL7660A 6
45
FIGURE 20. SPLITTING A SUPPLY IN HALF
V+
V-
Regulated Negative Voltage Supply
In some cases, the output impedance of the ICL7660S and
ICL7660A can be a problem, particularly if the load current
varies substantially. The circuit of Figure 21 can be used to
overcome this by controlling the input voltage, via an
ICL7611 low-power CMOS op amp, in such a way as to
maintain a nearly constant output voltage. Direct feedback is
inadvisable, since the ICL7660S’s and ICL7660A’s output
does not respond instantaneously to change in input, but
only after the switching delay. The circuit shown supplies
enough delay to accommodate the ICL7660S and
ICL7660A, while maintaining adequate feedback. An
increase in pump and storage capacitors is desirable, and
the values shown provide an output impedance of less than
5Ω to a load of 10mA.
Other Applications
Further information on the operation and use of the
ICL7660S and ICL7660A may be found in application note
AN051, “Principles and Applications of the ICL7660 CMOS
Voltage Converter”.
+8V
56k
50k
100k
50k
+8V
-
ICL7611
+
ICL8069
+
100µF -
100Ω
-
10µF
+
18
2 ICL7660S 7
3 ICL7660A 6
45
VOUT
800k
250k
VOLTAGE
ADJUST
-
+ 100µF
FIGURE 21. REGULATING THE OUTPUT VOLTAGE
11 FN3179.7
January 23, 2013
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ICL7660S.PDF ] | |
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