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PDF ICL828 Data sheet ( Hoja de datos )

Número de pieza ICL828
Descripción Switched-Capacitor Voltage Inverter
Fabricantes Intersil Corporation 
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TM
Data Sheet
ICL828
June 2000 File Number 4835.1
Switched-Capacitor Voltage Inverter
The ICL828 IC performs supply voltage conversions from
positive to negative for an input range of +1.5V to +5.5V
resulting in complementary output voltages of -1.5V to -5.5V.
The ICL828 has a 12kHz internal oscillator and requires two
capacitors to invert the supply voltage. Cascading may be
made to increase the output voltage. The high efficiency
(greater than 90% over most of the load-current range) and
low operating current (60µA typical) make these devices
ideal for both battery-powered and board-level voltage
conversion applications.
Ordering Information
PART
TEMP.
NUMBER RANGE (oC) PACKAGE PKG. NO BRAND
ICL828IH-T -40 to 85 5 Lead SOT23 P5.064 828
Block Diagram
NEGATIVE VOLTAGE CONVERTER
OUTPUT
VOLTAGE
INPUT
VOLTAGE
OUT
1
+
IN
2
C1+
5
+
3
C1-
4
GND
Features
• 5-Lead SOT23-5 Package
• 99% Open Circuit Voltage Conversion Efficiency
• Inverts Input Supply Voltage
• High Power Supply Efficiency
• Input Voltage Range . . . . . . . . . . . . . . . . . . +1.5V to +5.5V
• May be Cascaded to Increase Output Voltage
• Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
• Quiescent Current . . . . . . . . . . . . . . . . . . . . . . . . . . 60µA
• Pin for Pin Compatible to MAX828
• Small Package Size
Applications
• Simple Conversion . . . . . . . . . . . . . . . . . . . . . +5V to -5V
• Voltage Multiplication . . . . . . . . . . . . . . . . . . VOUT = -nVIN
• Supply Splitter
- Operational Amplifiers
- Bias Supplies
• Hand Held Products
- Cell Phones
- PDAs
- GPS
- Pagers
• LCD Panels
Pinout
ICL828 (SOT23)
TOP VIEW
OUT 1
IN 2
C1- 3
5 C1+
4 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000

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ICL828 pdf
ICL828
load. The drop at B is IOUT x t1/C2V. The peak-to-peak
ripple voltage is the sum of these voltage drops:
V
RIPPLE
2-----×-----C-----2----X-1---f--P-----U----M------P--
+
2
ESRC2
×
IO
U
T
Again, a low ESR capacitor will result in a higher
performance output.
Positive Voltage Doubling
The ICL828 may be employed to achieve positive voltage
doubling using the circuit shown in Figure 13. In this
application, the pump inverter switches of the ICL828 are
used to charge C1 to a voltage level of VIN -VF where VIN is
the supply voltage and VF is the forward voltage on C1 plus
the supply voltage (VIN) is applied through diode D2 to
capacitor C2. The voltage thus created on C2 becomes
(2VIN) - (2VF) or twice the supply voltage minus the
combined forward voltage drops of diodes D1 and D2.
The source impedance of the output (VOUT) will depend on
the output current.
Combined Negative Conversion and
Positive Supply Doubling
Figure 14 combines the functions shown on front page and
Figure 13 to provide negative voltage conversion and
positive voltage doubling simultaneously. This approach
would be, for example, suitable for generating +9V and -5V
from an existing +5V supply. In this instance capacitors C1
and C3 perform the pump and reservoir functions
respectively for the generation of the negative voltage, while
capacitors C2 and C4 are pump and reservoir respectively
for the doubled positive voltage. There is a penalty in this
configuration which combines both functions, however, in
that the source impedances of the generated supplies will be
somewhat higher due to the finite impedance of the common
charge pump driver at pin 2 of the device.
Cascading Devices
The ICL828 may be cascaded to produce a larger
multiplication supply voltage (see Figure 15). The output
voltage is:
VOUT = -n(VIN),
where n is an integer representing the number of devices
cascaded.
The resulting output resistance would be approximately the
sum of the individual ICL828 ROUT values.
t1
0
V
- (VIN)
B
A
FIGURE 12. OUTPUT RIPPLE
V+
1
2
3
D1
5-
C1
+
D2
4
VOUT =
(2VIN) - (2VF)
+
- C2
NOTE: D1 and D2 can be any suitable diode.
FIGURE 13. POSITIVE VOLTAGE DOUBLER
VIN
1
2
-3
+C1
VOUT = -VIN
5 - C3
+
D1
4
-+
C2
D2
VOUT = (2VIN) -
(VFD1) - (VFD2)
+
- C4
FIGURE 14. COMBINED NEGATIVE VOLTAGE AND POSITIVE
DOUBLER
1
OUT
5
C1+
C2
+
1
OUT
5
C1+
+VIN 2 IN
1
3 C1-
4
GND
+
C1
2
IN
3
C1 -
n
GND 4
C4
+
C3 +
VOUT
VOUT = - nVIN
FIGURE 15. CASCADING TO INCREASE OUTPUT VOLTAGE
5

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