1. Products
  2. Power Management
  3. Inductorless (Charge Pump) DC/DC Converters
  4. GaAsFET Bias Generators
  5. LTC1261


Overview

Features and Benefits

  • Regulated Negative Voltage from a Single Positive Supply
  • Can Provide Regulated -5V from a 3V Supply
  • REG Pin Indicates Output is in Regulation
  • Low Output Ripple: 5mV Typ
  • Supply Current: 600µA Typ
  • Shutdown Mode Drops Supply Current to 5µA
  • Up to 15mA Output Current
  • Adjustable or Fixed Output Voltages
  • Requires Only Three or Four External Capacitors
  • Available in SO-8 Packages

Product Details

The LTC1261 is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply. The LTC1261CS operates from a single 3V to 8V supply and provides an adjustable output voltage from –1.25V to –8V. An on-chip resistor string allows the LTC1261CS to be configured for output voltages of –3.5V, –4V, –4.5V or –5V with no external components. The LTC1261CS8 is optimized for applications which use a 5V or higher supply or which require low output voltages. It requires a single external 0.1µF capacitor and provides adjustable and fixed output voltage options in 8-pin SO packages. The LTC1261CS requires one or two external 0.1µF capacitors, depending on input voltage. Both versions require additional external 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 LTC1261 will supply up to 12mA output current with guaranteed output regulation of 5%. The LTC1261 includes an open-drain REG output which pulls low when the output is within 5% of the set value. Output ripple is typically as low as 5mV. Quiescent current is typically 600µA when operating and 5µA in shutdown.

The LTC1261 is available in a 14-pin narrow body SO package and an 8-pin SO package.

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LTC1261
LTC1261CS8
LTC1261CS8-4
LTC1261CS8-4.5
LTC1261LCS8
LTC1261LCS8-4
LTC1261LCS8-4.5

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1261CS#PBF Material Declaration Reliability Data 14-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS#TRPBF Material Declaration Reliability Data 14-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8-4#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8-4#TR Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8-4#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8-4.5#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261CS8-4.5#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261IS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1261IS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
Wafer Fabrication Data R320 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy


Ordering FAQs


See our Ordering FAQs for answers to questions about online orders, payment options and more.

 

Buy Now Pricing


(**) Displayed Buy Now Price and Price Range is based on small quantity orders.

 

List Pricing


(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

 

Lead Times


Please see the latest communication from our CCO regarding lead times.

 

Sampling


Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.


Price Table Help