Power Management Switching Regulator Step-Up (Boost) Regulators Micropower Boost

Obsolete

LT1309 - 500kHz Micropower DC/DC Converterfor Flash Memory

Features

  • OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
  • 60mA Output Current at 12V from 3V or 5V Supply
  • Shutdown to 9µA
  • VPP VALID Comparator
  • Up to 85% Efficiency
  • Switching Frequency: 500kHz (Typical)
  • Quiescent Current: 650µA
  • Low VCESAT Switch: 300mV at 0.5A (Typical)
  • Soft Start Reduces Supply Current Transients
  • Uses Low Value, Small Size, Surface Mount Inductors
  • Available in 8-Lead SO Package

Typical Application

LT1309 Typical Application
LT1309 Typical Application

Description

OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.

The LT1309 is a 500kHz micropower DC/DC converter for Flash Memory. The regulator features Burst Mode™ operation with a 0.5A, 300mV switch, enabling 85% efficiency at the fixed 12V output. High frequency operation permits the use of small value, and therefore small size, surface mount inductors and capacitors. The LT1309 comes in an 8-lead SO package allowing extremely compact PC board layouts. These features make the device attractive for PCMCIA cards, cellular phones and other applications where PC board space is limited.

Quiescent current is 650µA decreasing to 9µA when the part shuts down. The device includes a soft start feature which limits supply current transients during turn-on.

The LT1309 contains a VPP VALID comparator with a logic output that goes low when the output voltage is ready to program 12V Flash Memory. This comparator simplifies the interface to external control logic.

Packaging

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

LT1309 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

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

  • Flash Memory VPP Generators
  • Type II and III PCMCIA Card DC/DC Converters
  • 3V to 12V, 5V to 12V Converters
  • Portable Computers and Instruments
  • Cellular Telephones
  • DC/DC Converter Module Replacements

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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:
LT1309

Technical Support