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기능 CMOS Voltage Converters
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7660CBA 데이터시트, 핀배열, 회로
®
Data Sheet
ICL7660, ICL7660A
October 10, 2005
FN3072.7
CMOS Voltage Converters
The Intersil ICL7660 and ICL7660A are monolithic CMOS
power supply circuits which offer unique performance
advantages over previously available devices. The ICL7660
performs supply voltage conversions from positive to
negative for an input range of +1.5V to +10.0V resulting in
complementary output voltages of -1.5V to -10.0V and the
ICL7660A does the same conversions with an input range of
+1.5V to +12.0V resulting in complementary output voltages
www.DataSheoeft-41U..5cVomto -12.0V. Only 2 noncritical external capacitors are
needed for the charge pump and charge reservoir functions.
The ICL7660 and ICL7660A can also be connected to
function as voltage doublers and will generate output
voltages up to +18.6V with a +10V input.
Contained on the chip are a series DC supply regulator, RC
oscillator, voltage level translator, and four output power
MOS switches. A unique logic element senses the most
negative voltage in the device and ensures that the output
N-Channel switch source-substrate junctions are not forward
biased. This assures latchup free operation.
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
overdriven by an external clock.
The “LV” terminal may be tied to GROUND to bypass the
internal series regulator and improve low voltage (LV)
operation. At medium to high voltages (+3.5V to +10.0V for
the ICL7660 and +3.5V to +12.0V for the ICL7660A), the LV
pin is left floating to prevent device latchup.
Pinouts
ICL7660, ICL7660A
(8 LD PDIP, SOIC)
TOP VIEW
NC 1
CAP+ 2
GND 3
CAP- 4
8 V+
7 OSC
6 LV
5 VOUT
Features
• Simple Conversion of +5V Logic Supply to ±5V Supplies
• Simple Voltage Multiplication (VOUT = (-) nVIN)
• Typical Open Circuit Voltage Conversion Efficiency 99.9%
• Typical Power Efficiency 98%
• Wide Operating Voltage Range
- ICL7660 . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 10.0V
- ICL7660A . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 12.0V
• ICL7660A 100% Tested at 3V
• Easy to Use - Requires Only 2 External Non-Critical
Passive Components
• No External Diode Over Full Temp. and Voltage Range
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• On Board Negative Supply for Dynamic RAMs
• Localized µProcessor (8080 Type) Negative Supplies
• Inexpensive Negative Supplies
• Data Acquisition Systems
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 1999-2004, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.




7660CBA pdf, 반도체, 판매, 대치품
ICL7660, ICL7660A
Electrical Specifications ICL7660 and ICL7660A, V+ = 5V, TA = 25°C, COSC = 0, Test Circuit Figure 11
Unless Otherwise Specified (Continued)
ICL7660
ICL7660A
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX UNITS
Voltage Conversion Efficiency
VOUTEFF V+ = 3V, RL =
- - - 99 - - %
TMIN < TA < TMAX
- - - 99 - - %
Power Efficiency
PEFF V+ = 3V, RL = 5k
- - - 96 - - %
TMIN < TA < TMAX
- - - 95 - - %
NOTES:
2. Connecting any input terminal to voltages greater than V+ or less than GND may cause destructive latchup. It is recommended that no inputs
from sources operating from external supplies be applied prior to “power up” of the ICL7660, ICL7660A.
3. Derate linearly above 50°C by 5.5mW/°C.
www.DataShee4t.4UIsnm.cthaoelml bteusttficniritceusitt,rtahyerceapisanciotaenxcteerpnraelsceanpt,aociftothreapoprdlieerdotof 5ppinF.7. However, when the device is plugged into a test socket, there is usually a very
5. The Intersil ICL7660A can operate without an external diode over the full temperature and voltage range. This device will function in existing
designs which incorporate an external diode with no degradation in overall circuit performance.
Functional Block Diagram
V+
RC
OSCILLATOR
÷2
VOLTAGE
LEVEL
TRANSLATOR
CAP+
CAP-
OSC
LV
VOUT
VOLTAGE
REGULATOR
LOGIC
NETWORK
Typical Performance Curves (Test Circuit of Figure 11)
10
8 SUPPLY VOLTAGE RANGE
(NO DIODE REQUIRED)
6
4
2
0
-55 -25
0 25 50
TEMPERATURE (°C)
100 125
FIGURE 1. OPERATING VOLTAGE AS A FUNCTION OF
TEMPERATURE
10K
1000
TA = 25°C
100
10
0 1 23 4 56 7 8
SUPPLY VOLTAGE (V+)
FIGURE 2. OUTPUT SOURCE RESISTANCE AS A FUNCTION
OF SUPPLY VOLTAGE
4 FN3072.7
October 10, 2005

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7660CBA 전자부품, 판매, 대치품
ICL7660, ICL7660A
The voltage regulator portion of the ICL7660 and ICL7660A is
an integral part of the anti-latchup circuitry, however its inherent
voltage drop can degrade operation at low voltages. Therefore,
to improve low voltage operation the “LV” pin should be
connected to GROUND, disabling the regulator. For supply
voltages greater than 3.5V the LV terminal must be left open to
insure latchup proof operation, and prevent device damage.
8
VIN
3
S1
2 S2
C1
3
www.DataSheet4U.com
S3
S4 C2 5
VOUT = -VIN
7
FIGURE 12. IDEALIZED NEGATIVE VOLTAGE CONVERTER
Theoretical Power Efficiency
Considerations
In theory a voltage converter can approach 100% efficiency
if certain conditions are met.
1. The driver circuitry consumes minimal power.
2. The output switches have extremely low ON resistance
and virtually no offset.
3. The impedances of the pump and reservoir capacitors
are negligible at the pump frequency.
The ICL7660 and ICL7660A approach these conditions for
negative voltage conversion if large values of C1 and C2
are used.
ENERGY IS LOST ONLY IN THE TRANSFER OF
CHARGE BETWEEN CAPACITORS IF A CHANGE IN
VOLTAGE OCCURS. The energy lost is defined by:
E = 1/2 C1 (V12 - V22)
where V1 and V2 are the voltages on C1 during the pump and
transfer cycles. If the impedances of C1 and C2 are relatively
high at the pump frequency (refer to Figure 12) compared to
the value of RL, there will be a substantial difference in the
voltages V1 and V2. Therefore it is not only desirable to make
C2 as large as possible to eliminate output voltage ripple, but
also to employ a correspondingly large value for C1 in order to
achieve maximum efficiency of operation.
Do’s And Don’ts
1. Do not exceed maximum supply voltages.
2. Do not connect LV terminal to GROUND for supply
voltages greater than 3.5V.
3. Do not short circuit the output to V+ supply for supply
voltages above 5.5V for extended periods, however,
transient conditions including start-up are okay.
4. When using polarized capacitors, the + terminal of C1
must be connected to pin 2 of the ICL7660 and ICL7660A
and the + terminal of C2 must be connected to GROUND.
5. If the voltage supply driving the ICL7660 and ICL7660A
has a large source impedance (25- 30), then a 2.2µF
capacitor from pin 8 to ground may be required to limit
rate of rise of input voltage to less than 2V/µs.
6. User should insure that the output (pin 5) does not go
more positive than GND (pin 3). Device latch up will occur
under these conditions. A 1N914 or similar diode placed
in parallel with C2 will prevent the device from latching up
under these conditions. (Anode pin 5, Cathode pin 3).
+
10µF
-
18
2 ICL7660 7
ICL7660A
36
45
V+
-
10µF
+
VOUT = - V+
RO
-
V+
+
VOUT
FIGURE 13A. CONFIGURATION
FIGURE 13B. THEVENIN EQUIVALENT
FIGURE 13. SIMPLE NEGATIVE CONVERTER
7 FN3072.7
October 10, 2005

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7660CBA

CMOS Voltage Converters

Intersil Corporation
Intersil Corporation

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