LT1500

Obsolete

LT1500

Adaptive-Frequency Current Mode Switching Regulators

Obsolete

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Features

OBSOLETE: For Information Purposes Only. Contact Analog Devices 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

Additional Details

OBSOLETE: For Information Purposes Only. Contact Analog Devices 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.

Applications

Portable Instrumentation
Battery Operated Systems
PDA's
Standby Power

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Technical Documents 3

LT1500/LT1501: Adaptive-Frequency Current Mode Switching Regulators Data Sheet 04/07/2009

R386 Reliability Data 03/22/2018

DN151 - The LT1500/LT1501 Low Noise Micropower DC/DC Converters 08/21/2007

LTspice 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.