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Intersil Electronic Components Datasheet



ICL828

Switched-Capacitor Voltage Inverter



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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
Absolute Maximum Ratings
IN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V, -0.3V
OUT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6.0V, +0.3V
OUT Output CURRENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
OUT Short-circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (oC/W)
SOT23 Package
240
Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. (See Tech Brief TB379 for details.).
Electrical Specifications
PARAMETER
Supply Current
Minimum Supply Voltage
Maximum Supply Voltage
Oscillator Frequency
Power Efficiency
Voltage Conversion Efficiency
Output Resistance
VIN = +5V, C1 = C2 = 10µF, TA = -40oC to 85oC, Unless Otherwise Specified
SYMBOL
TEST CONDITIONS
MIN
ICC 25oC
-40oC to 85oC
-
-
VCC
RL = 10K, 25oC
RL = 10K, -40oC to 85oC
1.25
1.5
VCC
fOSC
PEFF
RL = 10K
-40oC to 85oC
RL = 10K, 25oC
-
6
-
VOUT / VIN
ROUT
RL = Open
IOUT = 5mA, 25oC
IOUT = 5mA, -40 to 85oC
95
-
-
TYP
60
-
1.0
-
-
-
98
99.9
20
-
MAX
90
115
-
-
5.5
20
-
-
50
65
UNITS
µA
µA
V
V
V
kHz
%
%
Typical Performance Curves
45
40
35
30
25
20
15
10
5
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5
FIGURE 1. OUTPUT RESISTANCE vs SUPPLY VOLTAGE
500
400
300 VIN = 3.15V, VOUT = -2.5V
200 VIN = 1.9V, VOUT = -1.5V
100 VIN = 4.75V, VOUT = -4.0V
0
1.5
20 40 60
CAPACITANCE (µF)
80
FIGURE 2. OUTPUT VOLTAGE RIPPLE vs CAPACITANCE
2



Part Number ICL828
Description Switched-Capacitor Voltage Inverter
Maker Intersil Corporation - Intersil Corporation
Total Page 7 Pages
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