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LM2766

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SNVS071B –MARCH 2000–REVISED MAY 2013

LM2766 Switched Capacitor Voltage Converter

Check for Samples: LM2766

FEATURES

DESCRIPTION

The LM2766 CMOS charge-pump voltage converter

• Doubles Input Supply Voltage

operates as a voltage doubler for an input voltage in

• SOT-23 6-Pin Package

the range of +1.8V to +5.5V. Two low cost capacitors

• 20Ω Typical Output Impedance

and a diode are used in this circuit to provide up to 20

mA of output current.

• 90% Typical Conversion Efficiency at 20 mA

• 0.1µA Typical Shutdown Current

The LM2766 operates at 200 kHz switching

frequency to reduce output resistance and voltage

ripple. With an operating current of only 350 µA

APPLICATIONS

(operating efficiency greater than 90% with most

• Cellular Phones

loads) and 0.1µA typical shutdown current, the

• Pagers

LM2766 provides ideal performance for battery

powered systems. The device is manufactured in a

• PDAs

SOT-23 6-pin package.

• Operational Amplifier Power Supplies

• Interface Power Supplies

• Handheld Instruments

Basic Application Circuits

Figure 1. Voltage Doubler

Connection Diagram

Figure 2. DBV Package Top View

Figure 3. Actual Size

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (15 pages)

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LM2766 www.ti.com SNVS071B – MARCH 2000 – REVISED MAY 2013 LM2766 Switched Capacitor Voltage Converter Check for Samples: LM2766 FEATURES DESCRIPTION • • • • • The LM2766 CMOS charge-pump voltage converter operates as a voltage doubler for an input voltage in the range of +1.8V to +5.5V. Two low cost capacitors and a diode are used in this circuit to provide up to 20 mA of output current.
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LM2766 SNVS071B – MARCH 2000 – REVISED MAY 2013 www.ti.com Pin Description Pin Name Function 1 V+ 2 GND Power supply positive voltage input. Power supply ground input. 3 CAP− Connect this pin to the negative terminal of the charge-pump capacitor. 4 SD 5 VOUT Shutdown control pin, tie this pin to V+ in normal operation. Positive voltage output. 6 CAP+ Connect this pin to the positive terminal of the charge-pump capacitor. These devices have limited built-in ESD protection.
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LM2766 www.ti.com SNVS071B – MARCH 2000 – REVISED MAY 2013 Electrical Characteristics Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: V+ = 5V, C1 = C2 = 1.0 μF. (1) Symbol Parameter V+ Supply Voltage IQ Supply Current ISD Shutdown Supply Current Condition Min No Load TA = 85°C VSD Shutdown Pin Input Voltage Typ Max Units 5.5 V 350 950 µA 0.1 0.5 1.8 Shutdown Mode 0.2 0.
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LM2766 SNVS071B – MARCH 2000 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (Circuit of Figure 4, VIN = 5V, TA = 25°C unless otherwise specified) 4 Supply Current vs Supply Voltage Output Resistance vs Capacitance Figure 5. Figure 6. Output Resistance vs Supply Voltage Output Resistance vs Temperature Figure 7. Figure 8. Output Voltage vs Load Current Efficiency vs Load Current Figure 9. Figure 10.
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LM2766 www.ti.com SNVS071B – MARCH 2000 – REVISED MAY 2013 Typical Performance Characteristics (continued) (Circuit of Figure 4, VIN = 5V, TA = 25°C unless otherwise specified) Switching Frequency vs Supply Voltage Switching Frequency vs Temperature Figure 11. Figure 12. Output Ripple vs Load Current Figure 13.
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LM2766 SNVS071B – MARCH 2000 – REVISED MAY 2013 www.ti.com CIRCUIT DESCRIPTION The LM2766 contains four large CMOS switches which are switched in a sequence to double the input supply voltage. Energy transfer and storage are provided by external capacitors. Figure 14 illustrates the voltage conversion scheme. When S2 and S4 are closed, C1 charges to the supply voltage V+. During this time interval, switches S1 and S3 are open.
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LM2766 www.ti.com SNVS071B – MARCH 2000 – REVISED MAY 2013 CAPACITOR SELECTION As discussed in the Positive Voltage Doubler section, the output resistance and ripple voltage are dependent on the capacitance and ESR values of the external capacitors.
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LM2766 SNVS071B – MARCH 2000 – REVISED MAY 2013 www.ti.com CASCADING DEVICES Cascading the LM2766s is an easy way to produce a greater voltage (A two-stage cascade circuit is shown in Figure 16). The effective output resistance is equal to the weighted sum of each individual device: Rout = 1.5Rout_1 + Rout_2 (5) Note that increasing the number of cascading stages is pracitically limited since it significantly reduces the efficiency, increases the output resistance and output voltage ripple. Figure 16.
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LM2766 www.ti.com SNVS071B – MARCH 2000 – REVISED MAY 2013 REVISION HISTORY Changes from Revision A (May 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ............................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LM2766M6 SOT-23 DBV 6 1000 178.0 8.4 LM2766M6X/NOPB SOT-23 DBV 6 3000 178.0 8.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2766M6 SOT-23 DBV 6 1000 210.0 185.0 35.0 LM2766M6X/NOPB SOT-23 DBV 6 3000 210.0 185.0 35.
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