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LM2766
SNVS071C –MARCH 2000–REVISED SEPTEMBER 2015
LM2766 Switched Capacitor Voltage Converter
1 Features 3 Description
The LM2766 CMOS charge-pump voltage converter
1• Doubles Input Supply Voltage operates as a voltage doubler for an input voltage in
• SOT-23 6-Pin Package the range of 1.8 V to 5.5 V. Two low-cost capacitors
• 20-ΩTypical 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
• 0.1-µA Typical Shutdown Current The LM2766 operates at 200-kHz switching
frequency to reduce output resistance and voltage
2 Applications ripple. With an operating current of only 350 µA
(operating efficiency greater than 90% with most
• Cellular Phones loads) and 0.1-µA 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 Device Information(1)
• Handheld Instruments PART NUMBER PACKAGE BODY SIZE (NOM)
LM2766 SOT-23 (6) 2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
space
space
space
Typical Voltage Doubler Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2766
SNVS071C –MARCH 2000–REVISED SEPTEMBER 2015
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Table of Contents
8.3 Feature Description................................................... 8
1 Features.................................................................. 18.4 Device Functional Modes.......................................... 8
2 Applications ........................................................... 19 Application and Implementation .......................... 9
3 Description............................................................. 19.1 Application Information.............................................. 9
4 Revision History..................................................... 29.2 Typical Application ................................................... 9
5 Pin Configuration and Functions......................... 310 Power Supply Recommendations ..................... 12
6 Specifications......................................................... 411 Layout................................................................... 13
6.1 Absolute Maximum Ratings ...................................... 411.1 Layout Guidelines ................................................. 13
6.2 ESD Ratings.............................................................. 411.2 Layout Example .................................................... 13
6.3 Recommended Operating Conditions....................... 412 Device and Documentation Support................. 14
6.4 Thermal Information.................................................. 412.1 Device Support...................................................... 14
6.5 Electrical Characteristics........................................... 512.2 Community Resources.......................................... 14
6.6 Typical Characteristics ............................................. 612.3 Trademarks........................................................... 14
7 Parameter Measurement Information .................. 712.4 Electrostatic Discharge Caution............................ 14
7.1 Test Circuit................................................................ 712.5 Glossary................................................................ 14
8 Detailed Description.............................................. 813 Mechanical, Packaging, and Orderable
8.1 Overview................................................................... 8Information........................................................... 14
8.2 Functional Block Diagram......................................... 8
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (May 2013) to Revision C Page
• Added Device Information and Pin Configuration and Functions sections, ESD Rating table, Feature Description,
Device Functional Modes,Application and Implementation,Power Supply Recommendations,Layout,Device and
Documentation Support, and Mechanical, Packaging, and Orderable Information sections................................................. 1
Changes from Revision A (May 2013) to Revision B Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 12
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5 Pin Configuration and Functions
DBV Package
6-Pin SOT-23
Top View
Pin Functions
PIN TYPE DESCRIPTION
NO. NAME
1 V+ Power Power supply positive voltage input.
2 GND Ground Power supply ground input.
3 CAP−Power Connect this pin to the negative terminal of the charge-pump capacitor.
4 SD Input Shutdown control pin, tie this pin to V+ in normal operation.
5 VOUT Power Positive voltage output.
6 CAP+ Power Connect this pin to the positive terminal of the charge-pump capacitor.
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
Supply voltage (V+ to GND, or V+ to VOUT) 5.8 V
SD (GND −0.3) (V+ + 0.3) V
VOUT continuous output current 40 mA
Output short-circuit duration to GND(3) 1 sec
Continuous power dissipation (TA= 25°C)(4) 600 mW
TJMax(4) 150 °C
Storage temperature, Tstg −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, contact the TI Sales Office/ Distributors for availability and specifications.
(3) VOUT may be shorted to GND for one second without damage. For temperatures above 85°C, VOUT must not be shorted to GND or
device may be damaged.
(4) The maximum allowable power dissipation is calculated by using PDMax = (TJMax −TA)/RθJA, where TJMax is the maximum junction
temperature, TAis the ambient temperature, and RθJA is the junction-to-ambient thermal resistance of the specified package.
6.2 ESD Ratings VALUE UNIT
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000
Electrostatic
V(ESD) V
discharge Machine model (CDM), per JEDEC specification JESD22-C101(2) ±200
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) MIN NOM MAX UNIT
Junction temperature −40 100 °C
Ambient temperature −40 85 °C
Lead temperature (soldering, 10 sec.) 240 °C
6.4 Thermal Information LM2766
THERMAL METRIC(1) DBV (SOT-23) UNIT
6 PINS
RθJA Junction-to-ambient thermal resistance 210 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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6.5 Electrical Characteristics
Unless otherwise specified, typical limits are for TJ= 25°C, minimum and maximum limits apply over the full operating
temperature range: V+ = 5 V, C1= C2= 10 μF.(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V+ Supply voltage 1.8 5.5 V
IQSupply current No load 350 950 µA
TJ= 25°C 0.1 0.5 µA
ISD Shutdown supply current TA= 85°C 0.2
0.6 V
VSD Shutdown pin input voltage 2
2.5 V ≤VIN ≤5.5 V 20
ILOutput current mA
1.8 V ≤VIN ≤2.5 V 10
ROUT Output resistance(2) IL= 15 mA 20 55 Ω
ƒOSC Oscillator frequency See(3) 220 400 700 kHz
ƒSW Switching frequency See(3) 110 200 350 kHz
PEFF Power efficiency IL= 20 mA to GND 94%
VOEFF Voltage conversion efficiency No load 99.96%
(1) In the test circuit, capacitors C1and C2are 10-µF, 0.3-Ωmaximum ESR capacitors. Capacitors with higher ESR may increase output
resistance, and reduce output voltage and efficiency.
(2) Specified output resistance includes internal switch resistance and capacitor ESR. See the details in Application and Implementation for
positive voltage doubler.
(3) The output switches operate at one half of the oscillator frequency, ƒOSC = 2 × ƒSW.
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6.6 Typical Characteristics
(Circuit of Typical Voltage Doubler Application, VIN = 5 V, TA= 25°C unless otherwise specified)
Figure 1. Supply Current vs Supply Voltage Figure 2. Output Resistance vs Capacitance
Figure 3. Output Resistance vs Supply Voltage Figure 4. Output Resistance vs Temperature
Figure 5. Output Voltage vs Load Current Figure 6. Switching Frequency vs Supply Voltage
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Typical Characteristics (continued)
(Circuit of Typical Voltage Doubler Application, VIN = 5 V, TA= 25°C unless otherwise specified)
Figure 7. Switching Frequency vs Temperature Figure 8. Output Ripple vs Load Current
7 Parameter Measurement Information
7.1 Test Circuit
Figure 9. LM2766 Test Circuit
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LM2766
SD
V+
CAP+
OUT
GND
OSCILLATOR Switch Array
Switch Drivers CAP-
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8 Detailed Description
8.1 Overview
The LM2766 CMOS charge-pump voltage converter operates as a voltage doubler for an input voltage in the
range of 1.8 V to 5.5 V. Two low-cost capacitors and a diode (needed during start-up) are used in this circuit.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Test Circuit
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 10 illustrates the voltage
conversion scheme. When S2and S4are closed, C1charges to the supply voltage V+. During this time interval,
switches S1and S3are open. In the next time interval, S2and S4are open; at the same time, S1and S3are
closed, the sum of the input voltage V+ and the voltage across C1gives the 2 V+ output voltage when there is no
load. The output voltage drop when a load is added is determined by the parasitic resistance (Rds(on) of the
MOSFET switches and the ESR of the capacitors) and the charge transfer loss between capacitors. See
Application and Implementation for further details.
Figure 10. Voltage Doubling Principle
8.4 Device Functional Modes
8.4.1 Shutdown Mode
A shutdown (SD) pin is available to disable the device and reduce the quiescent current to 0.1 µA. In normal
operating mode, the SD pin is connected to V+. The device can be brought into the shutdown mode by applying
to the SD pin a voltage less than 20% of the V+ pin voltage.
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LM2766 provides a simple and efficient means of creating an output voltage level equal to twice that of the
input voltage. Without the need of an inductor, the application solution size can be reduced versus the magnetic
DC-DC converter solution.
9.2 Typical Application
The main application of the LM2766 is to double the input voltage.
Figure 11. LM2766 Typical Application
9.2.1 Design Requirements
For typical switched-capacitor voltage converter applications, use the parameters listed in Table 1.
Table 1. Design Parameters
DESIGN PARAMETER EXAMPLE VALUE
Minimum input voltage 1.8 to 5.5 V
Output current (minimum), 2.5 V ≤VIN ≤5.5 V 20 mA
Output current (minimum), 1.8 V ≤VIN ≤2.5 V 10 mA
Switching frequency 200 kHz (typical)
9.2.2 Detailed Design Procedure
9.2.2.1 Positive Voltage Doubler
Figure 12. Voltage Doubling Principle
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D=P
OUT
P
IN
=IL2RL
IL2RL+ IL2ROUT + IQ(V+)
V
RIPPLE =
IL
&OSC × C2
+ 2 × IL× ESRC2
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SNVS071C –MARCH 2000–REVISED SEPTEMBER 2015
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The output characteristics of this circuit can be approximated by an ideal voltage source in series with a
resistance. The voltage source equals 2 V+. The output resistance Rout is a function of the ON resistance of the
internal MOSFET switches, the oscillator frequency, and the capacitance and ESR of C1and C2. Because the
switching current charging and discharging C1is approximately twice the output current, the effect of the ESR of
the pumping capacitor C1is multiplied by four in the output resistance. The output capacitor C2is charging and
discharging at a current approximately equal to the output current, therefore, its ESR only counts once in the
output resistance. A good approximation of Rout is:
where
• RSW is the sum of the ON resistance of the internal MOSFET switches shown in Figure 12. (1)
The peak-to-peak output voltage ripple is determined by the oscillator frequency as well as the capacitance and
ESR of the output capacitor C2:
(2)
High capacitance, low ESR capacitors can reduce both the output resistance and the voltage ripple.
The Schottky diode D1is only needed to protect the device from turning on its own parasitic diode and potentially
latching up. During start-up, D1also quickly charges up the output capacitor to VIN minus the diode drop thereby
decreasing the start-up time. Therefore, the Schottky diode D1must have enough current carrying capability to
charge the output capacitor at start-up, as well as a low forward voltage to prevent the internal parasitic diode
from turning on. A Schottky diode like 1N5817 can be used for most applications. If the input voltage ramp is less
than 10 V/ms, a smaller Schottky diode like MBR0520LT1 can be used to reduce the circuit size.
9.2.2.2 Capacitor Selection
As discussed in Positive Voltage Doubler, the output resistance and ripple voltage are dependent on the
capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the
output resistance, and the power efficiency is
where
• IQ(V+) is the quiescent power loss of the device; and
• IL2ROUT is the conversion loss associated with the switch on-resistance, the two external capacitors and their
ESRs. (3)
The selection of capacitors is based on the specifications of the dropout voltage (which equals IOUT ROUT), the
output voltage ripple, and the converter efficiency. Low ESR capacitors (Table 2) are recommended to maximize
efficiency, reduce the output voltage drop and voltage ripple.
Table 2. Low ESR Capacitor Manufacturers
MANUFACTURER WEBSITE CAPACITOR TYPE
Nichicon Corp. www.nichicon.com PL & PF series, through-hole aluminum electrolytic
AVX Corp. www.avxcorp.com TPS series, surface-mount tantalum
Sprague www.vishay.com 593D, 594D, 595D series, surface-mount tantalum
Sanyo www.sanyovideo.com OS-CON series, through-hole aluminum electrolytic
Murata www.murata.com Ceramic chip capacitors
Taiyo Yuden www.t-yuden.com Ceramic chip capacitors
Tokin www.tokin.com Ceramic chip capacitors
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ROUT = ROUT of each LM2766
Number of Devices
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9.2.2.3 Paralleling Devices
Any number of LM2766 devices can be paralleled to reduce the output resistance. Because there is no closed
loop feedback, as found in regulated circuits, stable operation is assured. Each device must have its own
pumping capacitor C1, while only one output capacitor COUT is needed as shown in Figure 13. The composite
output resistance is:
(4)
Figure 13. Lowering Output Resistance By Paralleling Devices
9.2.2.4 Cascading Devices
Cascading the several LM2766 devices is an easy way to produce a greater voltage (a two-stage cascade circuit
is shown in Figure 14).
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 practically limited because it significantly reduces the
efficiency, increases the output resistance and output voltage ripple.
Figure 14. Increasing Output Voltage By Cascading Devices
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9.2.2.5 Regulating VOUT
It is possible to regulate the output of the LM2766 by use of a low dropout regulator (such as LP2980-5.0). The
whole converter is depicted in Figure 15.
A different output voltage is possible by use of LP2980-3.3, LP2980-3.0, or LP2980-ADJ.
The following conditions must be satisfied simultaneously for worst case design:
2Vin_min >Vout_min +Vdrop_max (LP2980) + Iout_max × Rout_max (LM2766) (6)
2Vin_max < Vout_max +Vdrop_min (LP2980) + Iout_min × Rout_min (LM2766) (7)
Figure 15. Generate a Regulated 5-V From 3-V Input Voltage
9.2.3 Application Curve
Figure 16. Efficiency vs Load Current
10 Power Supply Recommendations
The LM2766 is designed to operate from as an inverter over an input voltage supply range from 1.8 V and 5.5 V.
This input supply must be well-regulated and capable to supply the required input current. If the input supply is
located far from the device, additional bulk capacitance may be required in addition to the ceramic bypass
capacitors.
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V+
GND
LM2766
CAP-
CAP+
OUT
SD
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11 Layout
11.1 Layout Guidelines
The high switching frequency and large switching currents of the LM2766 make the choice of layout important.
Use the following steps as a reference to ensure the device is stable and maintains proper LED current
regulation across its intended operating voltage and current range.
• Place CIN on the top layer (same layer as the LM2766) and as close to the device as possible. Connecting
the input capacitor through short, wide traces to both the V+ and GND pins reduces the inductive voltage
spikes that occur during switching which can corrupt the V+ line.
• Place COUT on the top layer (same layer as the LM2766) and as close as possible to the OUT and GND pin.
The returns for both CIN and COUT must come together at one point, as close to the GND pin as possible.
Connecting COUT through short, wide traces reduce the series inductance on the OUT and GND pins that can
corrupt the VOUT and GND lines and cause excessive noise in the device and surrounding circuitry.
• Place C1 on the top layer (same layer as the LM2766 device) and as close to the device as possible.
Connect the flying capacitor through short, wide traces to both the CAP+ and CAP– pins.
11.2 Layout Example
Figure 17. LM2766 Layout Example
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12 Device and Documentation Support
12.1 Device Support
12.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
12.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.4 Electrostatic Discharge Caution
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.
12.5 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2766M6/NOPB ACTIVE SOT-23 DBV 6 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 S16B
LM2766M6X/NOPB ACTIVE SOT-23 DBV 6 3000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 85 S16B
(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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(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.
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.
PACKAGE OPTION ADDENDUM
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Addendum-Page 2
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.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2766M6/NOPB SOT-23 DBV 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM2766M6X/NOPB SOT-23 DBV 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Dec-2016
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2766M6/NOPB SOT-23 DBV 6 1000 210.0 185.0 35.0
LM2766M6X/NOPB SOT-23 DBV 6 3000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Dec-2016
Pack Materials-Page 2
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No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed a special agreement specifically governing such use.
Only those TI components which TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components
which have not been so designated is solely at the Buyer's risk, and that Buyer is solely responsible for compliance with all legal and
regulatory requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.
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Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video
RFID www.ti-rfid.com
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Wireless Connectivity www.ti.com/wirelessconnectivity
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