LTC1261L - Switched Capacitor Regulated Voltage Inverter

Features

  • Regulated Negative Voltage from a Single Positive Supply
  • REG Pin Indicates Output is in Regulation
  • Adjustable or Fixed Output Voltages
  • Output Regulation: ±3.5%
  • Supply Current: 650µA Typ
  • Shutdown Mode Drops Supply Current to 5µA
  • Up to 20mA Output Current
  • Requires Only Three or Four External Capacitors
  • Available in MS8 and SO-8 Packages

Typical Application

LTC1261L Typical Application
LTC1261L Typical Application

Description

The LTC1261L is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply. The LTC1261L operates from a single 2.7V to 5.25V supply and provides an adjustable output voltage from -1.23V to ±5V. The LTC1261L-4/LTC1261L-4.5 needs a single 4.5V to 5.25V supply and provides a fixed output voltage of -4V to -4.5V respectively. Three external capacitors are required: a 0.1µF flying capacitor and an input and output bypass capacitors. An optional compensation capacitor at ADJ (COMP) can be used to reduce the output voltage ripple.

Each version of the LTC1261L will supply up to 20mA output current with guaranteed output regulation of ±3.5%. The LTC1261L includes an open-drain REG output that pulls low when the output is within 5% of the set value. Quiescent current is typically 650µA when operating and 5µA in shutdown.

The LTC1261L is available in 8-pin MSOP and SO packages.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC1261LCMS8-4.5#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCMS8-4.5#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCMS8-4#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCMS8-4#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1261LCS8-4.5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LCS8-4.5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LCS8-4#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LCS8-4#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1261LIMS8-4.5#PBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIMS8-4.5#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIMS8-4#PBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIMS8-4#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC1261LIS8-4.5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1261LIS8-4.5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1261LIS8-4#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1261LIS8-4#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1261LIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1261LIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC1261L Package Drawing
LTC1261L Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC1261LCMS8-4.5#PBF MS-8 C $2.25 $1.90 Yes
LTC1261LCMS8-4.5#TRPBF MS-8 C $1.96 Yes
LTC1261LCMS8-4#PBF MS-8 C $2.25 $1.90 Yes
LTC1261LCMS8-4#TRPBF MS-8 C $1.96 Yes
LTC1261LCMS8#PBF MS-8 C $2.25 $1.90 Yes
LTC1261LCMS8#TRPBF MS-8 C $1.96 Yes
LTC1261LCS8-4.5#PBF SO-8 C $2.00 $1.70 Yes
LTC1261LCS8-4.5#TRPBF SO-8 C $1.76 Yes
LTC1261LCS8-4#PBF SO-8 C $2.00 $1.70 Yes
LTC1261LCS8-4#TRPBF SO-8 C $1.76 Yes
LTC1261LCS8#PBF SO-8 C $2.00 $1.70 Yes
LTC1261LCS8#TRPBF SO-8 C $1.76 Yes
LTC1261LIMS8-4.5#PBF MS-8 I $3.14 $2.20 Yes
LTC1261LIMS8-4.5#TRPBF MS-8 I $2.26 Yes
LTC1261LIMS8-4#PBF MS-8 I $3.14 $2.20 Yes
LTC1261LIMS8-4#TRPBF MS-8 I $2.26 Yes
LTC1261LIMS8#PBF MS-8 I $3.14 $2.20 Yes
LTC1261LIMS8#TRPBF MS-8 I $2.26 Yes
LTC1261LIS8-4.5#PBF SO-8 I $2.79 $1.95 Yes
LTC1261LIS8-4.5#TRPBF SO-8 I $2.01 Yes
LTC1261LIS8-4#PBF SO-8 I $2.79 $1.95 Yes
LTC1261LIS8-4#TRPBF SO-8 I $2.01 Yes
LTC1261LIS8#PBF SO-8 I $2.79 $1.95 Yes
LTC1261LIS8#TRPBF SO-8 I $2.01 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • GaAs FET Bias Generators
  • Negative Supply Generators
  • Battery-Powered Systems
  • Single Supply Applications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1261
LTC1261CS8
LTC1261CS8-4
LTC1261CS8-4.5
LTC1261LCS8
LTC1261LCS8-4
LTC1261LCS8-4.5

Technical Support