LTC660 - 100mA CMOS Voltage Converter

Features

  • Simple Conversion of 5V to -5V Supply
  • Output Drive: 100mA
  • ROUT: 6.5 ohms (0.65V Loss at 100mA)
  • Boost Pin (Pin 1) for Higher Switching Frequency
  • Inverting and Doubling Modes
  • Minimum Open Circuit Voltage Conversion Efficiency: 99%
  • Typical Power Conversion Efficiency with a 100mA Load: 88%
  • Easy to Use

Typical Application

LTC660 Typical Application
LTC660 Typical Application

Description

The LTC®660 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 1.5V to 5.5V, resulting in complementary output voltages of �1.5V to ±5.5V. It also performs a doubling at an input voltage range of 2.5V to 5.5V, resulting in a doubled output voltage of 5V to 11V. Only two external capacitors are needed for the charge pump and charge reservoir functions. The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the BOOST pin is tied to V+. The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs.

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
LTC660CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC660CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC660CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC660 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
LTC660CN8#PBF N-8 C $3.33 $2.75 Yes
LTC660CS8#PBF SO-8 C $3.67 $3.00 Yes
LTC660CS8#TRPBF SO-8 C $3.06 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

  • Conversion of 5V to ±5V Supplies
  • Inexpensive Negative Supplies
  • Data Acquisition Systems
  • High Current Upgrade to LTC1044 or 7660

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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:
LTC660

Technical Support