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LM2765

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SNVS070C –MARCH 2000–REVISED MAY 2013

LM2765 Switched Capacitor Voltage Converter

Check for Samples: LM2765

FEATURES

DESCRIPTION

The LM2765 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 LM2765 operates at 50 kHz switching frequency

to reduce output resistance and voltage ripple. With

an operating current of only 130 µA (operating

APPLICATIONS

efficiency greater than 90% with most loads) and

• Cellular Phones

0.1µA typical shutdown current, the LM2765 provides

• Pagers

ideal performance for battery powered systems. The

device is manufactured in a SOT-23 6-pin package.

• PDAs

• Operational Amplifier Power Supplies

• Interface Power Supplies

• Handheld Instruments

Basic Application Circuits

Voltage Doubler

Connection Diagram

6-Pin Small Outline Package

Figure 1. DBV Package Top View Figure 2. 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 (14 pages)

PAGE 1
LM2765 www.ti.com SNVS070C – MARCH 2000 – REVISED MAY 2013 LM2765 Switched Capacitor Voltage Converter Check for Samples: LM2765 FEATURES DESCRIPTION • • • • • The LM2765 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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LM2765 SNVS070C – 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 ground 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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LM2765 www.ti.com SNVS070C – 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 = 3.3 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 130 450 µA 0.1 0.5 1.8 Shutdown Mode 0.2 2.
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LM2765 SNVS070C – MARCH 2000 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (Circuit of Figure 3, VIN = 5V, TA = 25°C unless otherwise specified) 4 Supply Current vs Supply Voltage Output Resistance vs Capacitance Figure 4. Figure 5. Output Resistance vs Supply Voltage Output Resistance vs Temperature Figure 6. Figure 7. Output Voltage vs Load Current Efficiency vs Load Current Figure 8. Figure 9.
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LM2765 www.ti.com SNVS070C – MARCH 2000 – REVISED MAY 2013 Typical Performance Characteristics (continued) (Circuit of Figure 3, VIN = 5V, TA = 25°C unless otherwise specified) Switching Frequency vs Supply Voltage Switching Frequency vs Temperature Figure 10. Figure 11. Output Ripple vs Load Current Figure 12.
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LM2765 SNVS070C – MARCH 2000 – REVISED MAY 2013 www.ti.com CIRCUIT DESCRIPTION The LM2765 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 13 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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LM2765 www.ti.com SNVS070C – 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.
PAGE 8
LM2765 SNVS070C – MARCH 2000 – REVISED MAY 2013 www.ti.com CASCADING DEVICES Cascading the LM2765s is an easy way to produce a greater voltage (A two-stage cascade circuit is shown in Figure 15). 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 15.
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LM2765 www.ti.com SNVS070C – MARCH 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 ............................................................................................................
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) LM2765M6X/NOPB ACTIVE Package Type Package Pins Package Drawing Qty SOT-23 DBV 6 3000 Eco Plan Lead/Ball Finish (2) Green (RoHS & no Sb/Br) MSL Peak Temp Op Temp (°C) Device Marking (3) CU SN Level-1-260C-UNLIM (4/5) -40 to 85 S15B (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM2765M6X/NOPB Package Package Pins Type Drawing SPQ SOT-23 3000 DBV 6 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 178.0 8.4 Pack Materials-Page 1 3.2 B0 (mm) K0 (mm) P1 (mm) 3.2 1.4 4.0 W Pin1 (mm) Quadrant 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2765M6X/NOPB SOT-23 DBV 6 3000 210.0 185.0 35.
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