Power Management Inductorless (Charge Pump) DC/DC Converters Unregulated Doubling/Inverting Charge Pumps

LTC3261 - High Voltage, Low Quiescent Current Inverting Charge Pump

LTC1044S8 - Switched Capacitor Voltage Converter

Features

  • Plug-In Compatible with 7660 with These Additional Features:
  • Guaranteed Operation to 9V, with No External Diode, Over Full Temperature Range
  • Boost Pin (Pin 1) for Higher Switching Frequency
  • Lower Quiescent Power
  • Efficient Voltage Doubler
  • 200µA Max. No Load Supply Current at 5V
  • 97% Min. Open Circuit Voltage Conversion Efficiency
  • 95% Min. Power Conversion Efficiency
  • Wide Operating Supply Voltage Range, 1.5V to 9V
  • Easy to Use
  • Commercial Device Guaranteed Over -40°C to 85°C Temperature Range

Typical Application

LTC1044S8 Typical Application
LTC1044S8 Typical Application

Description

The LTC1044 is a monolithic CMOS switched capacitor voltage converter which is manufactured using Linear Technology's enhanced LTCMOSTM silicon gate process. The LTC1044 provides several voltage conversion functions: the input voltage can be inverted (VOUT=-VIN), doubled (VOUT=2 VIN), divided (VOUT=VIN/2) or multiplied (VOUT=�nVIN). Designed to be pin-for-pin and functionally compatible with the popular 7660, the LTC1044 provides significant features and improvements over earlier 7660 designs. These improvements include: full 1.5V to 9V supply operation over the entire operating temperature range, without the need for external protection diodes; 21/2 times lower quiescent current for greater power conversion efficiency; and a "boost" function which is available to raise the internal oscillator frequency to optimize performance in specific applications. Although the LTC1044 provides significant design and performance advantages over the earlier 7660 device, it still maintains its still maintains its compatibility with existing 7660 designs.

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
LTC1044CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1044CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


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
LTC1044CS8#PBF SO-8 C $2.75 $2.25 Yes
LTC1044CS8#TRPBF SO-8 C $2.31 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
  • Precise Voltage Division, VOUT=VIN/2±20ppm
  • Voltage Multiplication, VOUT=±nVIN
  • Supply Splitter, VOUT=±VS/2

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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:
LTC1044
LTC1044A

Technical Support