Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost

LT1500 - Adaptive-Frequency Current Mode Switching Regulators

Features

  • OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
  • Low Noise Adaptive-Frequency Current Mode
  • Operation Avoids Low Frequency Noise at
  • Most Load Currents
  • Can Be Externally Synchronized (LT1500)
  • Micropower Quiescent Current: 200µA
  • Shutdown Current: 8µA Typ
  • Internal Loop Compensation
  • Low-Battery Comparator Active in Shutdown
  • Minimum Input Voltage: 1.8V Typ
  • Additional Negative Voltage Feedback Pin (LT1500)
  • Up to 500kHz Switching Frequency
  • Uses Low Profile, Low Cost Surface Mount Inductors

Typical Application

LT1500 Typical Application

Description

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

The LT1500 is an adaptive-frequency current mode step-up switching regulator with an internal power switch that is rated up to 700mA. In contrast to pulse skipping switching regulators, the LT1500 uses a current mode topology that provides lower noise operation and improved efficiency. Only at very light loads is Burst Mode™ activated to give high efficiency and micropower operation. High switching frequency (up to 500kHz) allows very small inductors to be used, along with ceramic capacitors if desired.

The LT1500 operates with input voltages from 1.8V to 15V and has only 200µA operating current dropping to 8µA in shutdown. A low-battery comparator is included which stays alive in shutdown. A second output feedback pin with negative polarity allows negative output voltages to be regulated when the switcher is connected up as a Cuk or a flyback converter.

Two package types are available. The LT1500 comes in a 14-pin SO package, with two options available for fixed output (3.3V or 5V) or adjustable operation. A reduced feature part, the LT1501, comes in the smaller 8-pin SO package with internal frequency compensation. It is also available in adjustable and fixed output voltage versions.


Packaging

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

LT1500 Package Drawing
LT1500 Package Drawing
LT1500 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

  • Portable Instrumentation
  • Battery Operated Systems
  • Standby Power
  • PDA''s

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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:
LT1500
LT1500-3

Technical Support