LT1506

PRODUCTION

4.5A, 500kHz Step-Down Switching Regulator

Part Models: 24
1ku List Price: Starting From $6.31

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Overview

Constant 500kHz Switching Frequency
Easily Synchronizable
Operates with Input as Low as 4V
Uses All Surface Mount Components
Inductor Size Reduced to 1.8µH
Saturating Switch Design: 0.07Ω
Shutdown Current: 20µA
Cycle-by-Cycle Current Limiting

The LT1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.

A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utilizing a supply boost capacitor to saturate the power switch.

The LT1506 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.

Applications

Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power

Part Models: 24
1ku List Price: Starting From $6.31

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT1506CR#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-3.3#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-3.3#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-3.3SYNC#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-3.3Sync#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-SYNC#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CR-Sync#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506CS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-3.3#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-3.3#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-3.3SYNC#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-3.3Sync#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-SYNC#PBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IR-Sync#TRPBF	7-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1506IS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 10, 2022 - 22_0175 Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark
		PCN22_0175_Form Material_Report Delta Qualification Matrix
LT1506CR#PBF	PRODUCTION
LT1506CR#TRPBF	PRODUCTION
LT1506CR-3.3#PBF	PRODUCTION
LT1506CR-3.3#TRPBF	PRODUCTION
LT1506CR-3.3SYNC#PBF	PRODUCTION
LT1506CR-3.3Sync#TRPBF	PRODUCTION
LT1506CR-SYNC#PBF	PRODUCTION
LT1506CR-Sync#TRPBF	PRODUCTION
LT1506IR#PBF	PRODUCTION
LT1506IR#TRPBF	PRODUCTION
LT1506IR-3.3#PBF	PRODUCTION
LT1506IR-3.3#TRPBF	PRODUCTION
LT1506IR-3.3SYNC#PBF	PRODUCTION
LT1506IR-3.3Sync#TRPBF	PRODUCTION
LT1506IR-SYNC#PBF	PRODUCTION
LT1506IR-Sync#TRPBF	PRODUCTION
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0236_Form Material_Report Marking Comparison Delta Qualification Matrix
LT1506CS8#PBF	PRODUCTION
LT1506CS8#TRPBF	PRODUCTION
LT1506CS8-3.3#PBF	PRODUCTION
LT1506CS8-3.3#TRPBF	PRODUCTION
LT1506IS8#PBF	PRODUCTION
LT1506IS8#TRPBF	PRODUCTION
LT1506IS8-3.3#PBF	PRODUCTION
LT1506IS8-3.3#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)
		PCN22_0254_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1506CS8#PBF	PRODUCTION
LT1506CS8#TRPBF	PRODUCTION
LT1506CS8-3.3#PBF	PRODUCTION
LT1506CS8-3.3#TRPBF	PRODUCTION
LT1506IS8#PBF	PRODUCTION
LT1506IS8#TRPBF	PRODUCTION
LT1506IS8-3.3#PBF	PRODUCTION
LT1506IS8-3.3#TRPBF	PRODUCTION
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0060_Form Material_Report Delta Qualification Matrix
LT1506CS8#PBF	PRODUCTION
LT1506CS8#TRPBF	PRODUCTION
LT1506CS8-3.3#PBF	PRODUCTION
LT1506CS8-3.3#TRPBF	PRODUCTION
LT1506IS8#PBF	PRODUCTION
LT1506IS8#TRPBF	PRODUCTION
LT1506IS8-3.3#PBF	PRODUCTION
LT1506IS8-3.3#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT1506
LT1506-3.3

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.