LMC7660

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LMC7660 Switched Capacitor Voltage Converter

Check for Samples: LMC7660

1FEATURES DESCRIPTION
2• Operation Over Full Temperature and Voltage The LMC7660 is a CMOS voltage converter capable
Range without an External Diode of converting a positive voltage in the range of +1.5V
to +10V to the corresponding negative voltage of
• Low Supply Current, 200 μA Max −1.5V to −10V. The LMC7660 is a pin-for-pin
• Pin-for-pin Replacement for the 7660 replacement for the industry-standard 7660. The
• Wide Operating Range 1.5V to 10V converter features: operation over full temperature
and voltage range without need for an external diode,
• 97% Voltage Conversion Efficiency low quiescent current, and high power efficiency.
• 95% Power Conversion Efficiency
The LMC7660 uses its built-in oscillator to switch 4
• Easy to Use, Only 2 External Components power MOS switches and charge two inexpensive
• Extended Temperature Range electrolytic capacitors.

Block Diagram

Pin Configuration

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2 All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 1997–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LMC7660
SNOSBZ9C – APRIL 1997 – REVISED APRIL 2013 www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.

ABSOLUTE MAXIMUM RATINGS (1) (2)

Supply Voltage 10.5V
−0.3V to (V+ + 0.3V)
for V+ < 5.5V
Input Voltage on Pin 6, 7 (3)
(V − 5.5V) to (V+ + 0.3V)
+

for V+ > 5.5V

(3)
Current into Pin 6 20 μA
Output Short Circuit
Duration (V+ ≤ 5.5V) Continuous
(4)
Power Dissipation
PDIP Package 1.4W
SOIC Package 0.6W
(4)
TJ Max 150°C
θJA (4)
PDIP Package 90°C/W
SOIC Package 160°C/W
Storage Temp. Range −65°C ≤ T ≤ 150°C
Lead Temperature
(Soldering, 5 sec.) 260°C
(5)
ESD Tolerance ± 2000V

(1) Absolute Maximum ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not
apply when operating the device beyond its rated operating conditions. See Note (1) under Electrical Characteristics for conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) Connecting any input terminal to voltages greater than V+ or less than ground may cause destructive latchup. It is recommended that no
inputs from sources operating from external supplies be applied prior to “power-up” of the LMC7660.
(4) For operation at elevated temperature, these devices must be derated based on a thermal resistance of θja and Tj max, Tj = TA + θja PD.
(5) The test circuit consists of the human body model of 100 pF in series with 1500Ω.

ELECTRICAL CHARACTERISTICS (1)

LMC7660IN/
LMC7660IM Units
Symbol Parameter Conditions Typ
(2)
Limits
Limit
Is Supply Current RL = ∞ 120 200 μA
400 max
V+H Supply Voltage RL = 10 kΩ, Pin 6 Open 3 to 10 3 to 10 V
(3)
Range High Voltage Efficiency ≥ 90% 3 to 10
V+L Supply Voltage RL = 10 kΩ, Pin 6 to Gnd. 1.5 to 3.5 1.5 to 3.5 V
Range Low Voltage Efficiency ≥ 90% 1.5 to 3.5

(1) Boldface numbers apply at temperature extremes. All other numbers apply at TA = 25°C, V+ = 5V, Cosc = 0, and apply for the LMC7660
unless otherwise specified. Test circuit is shown in Figure 1 .
(2) Limits at room temperature are specified and 100% production tested. Limits in boldface are specified over the operating temperature
range (but not 100% tested), and are not used to calculate outgoing quality levels.
(3) The LMC7660 can operate without an external diode over the full temperature and voltage range. The LMC7660 can also be used with
the external diode Dx, when replacing previous 7660 designs.

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ELECTRICAL CHARACTERISTICS(1) (continued)

LMC7660IN/
LMC7660IM Units
Symbol Parameter Conditions Typ
(2)
Limits
Limit
Rout Output Source IL = 20 mA 55 100 Ω
Resistance 120 max
V = 2V, IL = 3 mA 110 200 Ω
Pin 6 Short to Gnd. 300 max
Fosc Oscillator 10 kHz
Frequency
Peff Power Efficiency RL = 5 kΩ 97 95 %
90 min
Vo eff Voltage Conversion RL = ∞ 99.9 97 %
Efficiency 95 min
Iosc Oscillator Sink or Pin 7 = Gnd. or V+ 3 μA
Source Current

Figure 1. LMC7660 Test Circuit

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TYPICAL PERFORMANCE CHARACTERISTICS

OSC Freq.
vs Vout
OSC vs
Capacitance Iout @ V+ = 2V

Figure 2. Figure 3.

Vout
vs Supply Current & Power Efficiency
Iout @ V+ = 5V vs Load Current (V+ = 2V)

Figure 4. Figure 5.

Supply Current & Power Efficiency Output Source Resistiance as a

vs Load Current (V+ = 5V) Function of Temperature

Figure 6. Figure 7.

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TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Output R
Unloaded Oscillator Frequency vs
as a Function of Temperature Supply Voltage

Figure 8. Figure 9.

Peff
vs
OSC Freq. @ V+ = 5V

Figure 10.

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APPLICATION INFORMATION

CIRCUIT DESCRIPTION
The LMC7660 contains four large CMOS switches which are switched in a sequence to provide supply inversion
Vout = −Vin. Energy transfer and storage are provided by two inexpensive electrolytic capacitors. Figure 11 shows
how the LMC7660 can be used to generate −V+ from V+. When switches S1 and S3 are closed, Cp charges to
the supply voltage V+. During this time interval, switches S2 and S4 are open. After Cp charges to V+, S1 and S3
are opened, S2 and S4 are then closed. By connecting S2 to ground, Cp develops a voltage −V+/2 on Cr. After a
number of cycles Cr will be pumped to exactly −V+. This transfer will be exact assuming no load on Cr, and no
loss in the switches.
In the circuit of Figure 11, S1 is a P-channel device and S2, S3, and S4 are N-channel devices. Because the
output is biased below ground, it is important that the p− wells of S3 and S4 never become forward biased with
respect to either their sources or drains. A substrate logic circuit specifies that these p− wells are always held at
the proper voltage. Under all conditions S4 p− well must be at the lowest potential in the circuit. To switch off S4,
a level translator generates VGS4 = 0V, and this is accomplished by biasing the level translator from the S4 p−
well.
An internal RC oscillator and ÷ 2 circuit provide timing signals to the level translator. The built-in regulator biases
the oscillator and divider to reduce power dissipation on high supply voltage. The regulator becomes active at
about V+ = 6.5V. Low voltage operation can be improved if the LV pin is shorted to ground for V+ ≤ 3.5V. For V+
≥ 3.5V, the LV pin must be left open to prevent damage to the part.

POWER EFFICIENCY AND RIPPLE

It is theoretically possible to approach 100% efficiency if the following conditions are met:
1. The drive circuitry consumes little power.
2. The power switches are matched and have low Ron.
3. The impedance of the reservoir and pump capacitors are negligibly small at the pumping frequency.
The LMC7660 closely approaches 1 and 2 above. By using a large pump capacitor Cp, the charge removed
while supplying the reservoir capacitor is small compared to Cp's total charge. Small removed charge means
small changes in the pump capacitor voltage, and thus small energy loss and high efficiency. The energy loss by
Cp is:
(1)
By using a large reservoir capacitor, the output ripple can be reduced to an acceptable level. For example, if the
load current is 5 mA and the accepted ripple is 200 mV, then the reservoir capacitor can omit approximately be
calculated from:

(2)

PRECAUTIONS
1. Do not exceed the maximum supply voltage or junction temperature.
2. Do not short pin 6 (LV terminal) to ground for supply voltages greater than 3.5V.
3. Do not short circuit the output to V+.
4. External electrolytic capacitors Cr and Cp should have their polarities connected as shown in Figure 1.

REPLACING PREVIOUS 7660 DESIGNS

To prevent destructive latchup, previous 7660 designs require a diode in series with the output when operated at
elevated temperature or supply voltage. Although this prevented the latchup problem of these designs, it lowered
the available output voltage and increased the output series resistance.
The TI LMC7660 has been designed to solve the inherent latch problem. The LCM7660 can operate over the
entire supply voltage and temperature range without the need for an output diode. When replacing existing
designs, the LMC7660 can be operated with diode Dx.
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Figure 11. Idealized Voltage Converter

TYPICAL APPLICATIONS

CHANGING OSCILLATOR FREQUENCY

It is possible to dramatically reduce the quiescent operating current of the LMC7660 by lowering the oscillator
frequency. The oscillator frequency can be lowered from a nominal 10 kHz to several hundred hertz, by adding a
slow-down capacitor Cosc (Figure 12). As shown in the Typical Performance Curves the supply current can be
lowered to the 10 μA range. This low current drain can be extremely useful when used in μPower and battery
back-up equipment. It must be understood that the lower operating frequency and supply current cause an
increased impedance of Cr and Cp. The increased impedance, due to a lower switching rate, can be offset by
raising Cr and Cp until ripple and load current requirements are met.

SYNCHRONIZING TO AN EXTERNAL CLOCK

Figure 13 shows an LMC7660 synchronized to an external clock. The CMOS gate overrides the internal oscillator
when it is necessary to switch faster or reduce power supply interference. The external clock still passes through
the ÷2 circuit in the 7660, so the pumping frequency will be ½ the external clock frequency.

Figure 12. Reduce Supply Current by Lowering Oscillator Frequency

Figure 13. Synchronizing to an External Clock

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LOWERING OUTPUT IMPEDANCE

Paralleling two or more LMC7660's lowers output impedance. Each device must have it's own pumping capacitor
Cp, but the reservoir capacitor Cr is shared as depicted in Figure 14. The composite output resistance is:

(3)

INCREASING OUTPUT VOLTAGE

Stacking the LMC7660s is an easy way to produce a greater negative voltage. It should be noted that the input
current required for each stage is twice the load current on that stage as shown in Figure 15. The effective output
resistance is approximately the sum of the individual Rout values, and so only a few levels of multiplication can be
used.
It is possible to generate −15V from +5V by connecting the second 7660's pin 8 to +5V instead of ground as
shown in Figure 16. Note that the second 7660 sees a full 20V and the input supply should not be increased
beyond +5V.

Figure 14. Lowering Output Resistance by Paralleling Devices

Figure 15. Higher Voltage by Cascade

Figure 16. Getting −15V from +5V

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SPLIT V+ IN HALF
Figure 17 is one of the more interesting applications for the LMC7660. The circuit can be used as a precision
voltage divider (for very light loads), alternately it is used to generate a ½ supply point in battery applications. In
the ½ cycle when S1 and S3 are closed, the supply voltage divides across the capacitors in a conventional way
proportional to their value. In the ½ cycle when S2 and S4 are closed, the capacitors switch from a series
connection to a parallel connection. This forces the capacitors to have the same voltage; the charge redistributes
to maintain precisely V+/2, across Cp and Cr. In this application all devices are only V+/2, and the supply voltage
can be raised to 20V giving exactly 10V at Vout.

GETTING UP … AND DOWN

The LMC7660 can also be used as a positive voltage multiplier. This application, shown in Figure 18, requires 2
additional diodes. During the first ½ cycle S2 charges Cp1 through D1; D2 is reverse biased. In the next ½ cycle
S2 is open and S1 is closed. Since Cp1 is charged to V+ − VD1 and is referenced to V+ through S1, the junction of
D1 and D2 is at V+ + (V+ −VD1). D1 is reverse biased in this interval. This application uses only two of the four
switches in the 7660. The other two switches can be put to use in performing a negative conversion at the same
time as shown in Figure 19. In the ½ cycle that D1 is charging Cp1, Cp2 is connected from ground to −Vout via S2
and S4, and Cr2 is storing Cp2's charge. In the interval that S1 and S3 are closed, Cp1 pumps the junction of D1
and D2 above V+, while Cp2 is refreshed from V+.

Figure 17. Split V+ in Half

Figure 18. Positive Voltage Multiplier

Figure 19. Combined Negative Converter and Positive Multiplier

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THERMOMETER SPANS 180°C

Using the combined negative and positive multiplier of Figure 20 with an LM35 it is possible to make a μPower
thermometer that spans a 180°C temperature range. The LM35 temperature sensor has an output sensitivity of
10 mV/°C, while drawing only 50 μA of quiescent current. In order for the LM35 to measure negative
temperatures, a pull down to a negative voltage is required. Figure 20 shows a thermometer circuit for measuring
temperatures from −55°C to +125°C and requiring only two 1.5V cells. End of battery life can be extended by
replacing the up converter diodes with Schottky's.

REGULATING −VOUT
It is possible to regulate the output of the LMC7660 and still maintain μPower performance. This is done by
enclosing the LMC7660 in a loop with a LP2951. The circuit of Figure 21 will regulate Vout to −5V for IL = 10 mA,
and Vin = 6V. For Vin > 7V, the output stays in regulation up to IL = 25 mA. The error flag on pin 5 of the LP2951
sets low when the regulated output at pin 4 drops by about 5%. The LP2951 can be shutdown by taking pin 3
high; the LMC7660 can be shutdown by shorting pin 7 and pin 8.
The LP2951 can be reconfigured to an adjustable type regulator, which means the LMC7660 can give a
regulated output from −2.0V to −10V dependent on the resistor ratios R1 and R2, as shown in Figure 22, Vref =
1.235V:

(4)

*For lower voltage operation, use Schottky rectifiers

Figure 20. μPower Thermometer Spans 180°C, and Pulls Only 150 μA

Figure 21. Regulated −5V with 200 μA Standby Current

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Vref = 1.235V
*Low voltage operation

Figure 22. LMC7660 and LP2951 Make a Negative Adjustable Regulator

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REVISION HISTORY

Changes from Revision B (April 2013) to Revision C Page

• Changed layout of National Data Sheet to TI format .......................................................................................................... 11

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 PACKAGE OPTION ADDENDUM

www.ti.com 3-Nov-2017

PACKAGING INFORMATION

Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples
(1) Drawing Qty (2) (6) (3) (4/5)

LMC7660IM NRND SOIC D 8 95 TBD Call TI Call TI LMC76

60IM
LMC7660IM/NOPB ACTIVE SOIC D 8 95 Green (RoHS CU SN Level-1-260C-UNLIM -40 to 85 LMC76
& no Sb/Br) 60IM
LMC7660IMX NRND SOIC D 8 2500 TBD Call TI Call TI LMC76
60IM
LMC7660IMX/NOPB ACTIVE SOIC D 8 2500 Green (RoHS CU SN Level-1-260C-UNLIM -40 to 85 LMC76
& no Sb/Br) 60IM
LMC7660IN/NOPB ACTIVE PDIP P 8 40 Green (RoHS CU SN Level-1-NA-UNLIM -40 to 85 LMC
& no Sb/Br) 7660IN

(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.

(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.

(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.

Addendum-Page 1
 PACKAGE OPTION ADDENDUM

www.ti.com 3-Nov-2017

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 2
 PACKAGE MATERIALS INFORMATION

www.ti.com 8-Apr-2013

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1
Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LMC7660IMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1
LMC7660IMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1

Pack Materials-Page 1
 PACKAGE MATERIALS INFORMATION

www.ti.com 8-Apr-2013

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LMC7660IMX SOIC D 8 2500 367.0 367.0 35.0
LMC7660IMX/NOPB SOIC D 8 2500 367.0 367.0 35.0

Pack Materials-Page 2
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