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LM2767

www.ti.com

SNVS069C –FEBRUARY 2000–REVISED MAY 2013

LM2767 Switched Capacitor Voltage Converter

Check for Samples: LM2767

FEATURES

DESCRIPTION

• Doubles Input Supply Voltage

The LM2767 CMOS charge-pump voltage converter

• SOT-23 5-Pin Package

operates as a voltage doubler for an input voltage in

• 20Ω Typical Output Impedance

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

and a diode are used in this circuit to provide at least

• 96% Typical Conversion Efficiency at 15mA

15 mA of output current.

APPLICATIONS

The LM2767 operates at 11 kHz switching frequency

to avoid audio voice-band interference. With an

• Cellular Phones

operating current of only 40 µA (operating efficiency

• Pagers

greater than 90% with most loads), the LM2767

• PDAs, Organizers

provides ideal performance for battery powered

systems. The device is manufactured in a SOT-23 5-

• Operational Amplifier Power Suppliers

pin package.

• Interface Power Suppliers

• Handheld Instruments

Basic Application Circuit

Figure 1. Voltage Doubler

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 (16 pages)

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LM2767 www.ti.
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LM2767 SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Connection Diagram 5-Pin Small Outline Package 1 5 2 3 4 Figure 2. DBV Package Top View Figure 3. Actual Size PIN FUNCTIONS Pin Name 1 VOUT Positive voltage output. 2 GND Power supply ground input. 3 CAP− Connect this pin to the negative terminal of the charge-pump capacitor. 4 V+ 5 CAP+ Function Power supply positive voltage input. Connect this pin to the positive terminal of the charge-pump capacitor.
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LM2767 www.ti.com SNVS069C – FEBRUARY 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 = 10 μF. (1) Symbol Parameter Condition Min Typ 1.8 Max Units 5.5 V V+ Supply Voltage IQ Supply Current No Load IL Output Current 1.8V ≤ V+ ≤ 5.
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LM2767 SNVS069C – FEBRUARY 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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LM2767 www.ti.com SNVS069C – FEBRUARY 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. CIRCUIT DESCRIPTION The LM2767 contains four large CMOS switches which are switched in a sequence to double the input supply voltage.
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LM2767 SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Figure 14. Voltage Doubling Principle POSITIVE VOLTAGE DOUBLER The main application of the LM2767 is to double the input voltage. The range of the input supply voltage is 1.8V to 5.5V. The output characteristics of this circuit can be approximated by an ideal voltage source in series with a resistance. The voltage source equals 2V+.
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LM2767 www.ti.com SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 The selection of capacitors is based on the allowable voltage droop (which equals Iout Rout), and the desired output voltage ripple. Low ESR capacitors (Table 1) are recommended to maximize efficiency, reduce the output voltage drop and voltage ripple. Table 1. Low ESR Capacitor Manufacturers Phone Website Nichicon Corp. Manufacturer (847)-843-7500 www.nichicon.
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LM2767 SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 www.ti.com Figure 16. Increasing Output Voltage by Cascading Devices REGULATING VOUT It is possible to regulate the output of the LM2767 by use of a low dropout regulator (such as LP2980-5.0). The whole converter is depicted in Figure 17. A different output voltage is possible by use of LP2980-3.3, LP2980-3.0, or LP2980-adj.
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LM2767 www.ti.com SNVS069C – FEBRUARY 2000 – REVISED MAY 2013 REVISION HISTORY Changes from Revision B (May 2013) to Revision C • 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 8-May-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) B0 (mm) K0 (mm) P1 (mm) LM2767M5 SOT-23 DBV 5 1000 178.0 8.4 LM2767M5/NOPB SOT-23 DBV 5 1000 178.0 LM2767M5X SOT-23 DBV 5 3000 178.0 LM2767M5X/NOPB SOT-23 DBV 5 3000 178.0 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2767M5 SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2767M5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2767M5X SOT-23 DBV 5 3000 210.0 185.0 35.0 LM2767M5X/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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