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ICL7660SCPAZ Datasheet(PDF) 11 Page - Intersil Corporation

Part # ICL7660SCPAZ
Description  Guaranteed Lower Max Supply Current for All Temperature Ranges
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ICL7660SCPAZ Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN3179.7
January 23, 2013
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).
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
5
Ω 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”.
1
2
3
4
8
7
6
5
ICL7660S
V+
D1
D2
C4
VOUT = (2V+) -
(VFD1) - (VFD2)
+
-
C2
+
-
C3
+
-
VOUT = -VIN
C1
+
-
FIGURE 19. COMBINED NEGATIVE VOLTAGE CONVERTER
AND POSITIVE DOUBLER
D3
ICL7660A
1
2
3
4
8
7
6
5
+
-
+
-
50µF
50µF
+
-
50µF
RL1
VOUT = V+ - V-
2
ICL7660S
V+
V-
RL2
FIGURE 20. SPLITTING A SUPPLY IN HALF
ICL7660A
1
2
3
4
8
7
6
5
+
-
100µF
ICL7660S
100µF
VOUT
+
-
10µF
ICL7611
+
-
100
Ω
50k
+8V
100k
50k
ICL8069
56k
+8V
800k
250k
VOLTAGE
ADJUST
+
-
FIGURE 21. REGULATING THE OUTPUT VOLTAGE
ICL7660A
ICL7660S, ICL7660A


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