LT1578

PRODUCTION

1.5A, 200kHz Step-Down Switching Regulator

Part Models: 8
1ku List Price: Starting From $3.98

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Overview

1.5A Switch Current
High Efficiency—Low Loss 0.2Ω Switch
Constant 200kHz Switching Frequency
4V to 15V Input Voltage Range
Minimum Output: 1.21V
Low Supply Current: 1.9mA
Low Shutdown Current: 20µA
Easily Synchronizable Up to 400kHz
Cycle-by-Cycle Current Limit
Reduced EMI Generation
Low Thermal Resistance SO-8 Package
Uses Small Low Value Inductors

The LT1578 is a 200kHz monolithic buck mode switching regulator. A 1.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. The topology is current mode for fast transient response and good loop stability. The LT1578 is a modified version of the LT1507 that has been optimized for noise sensitive applications. It will operate over a 4V to 15V input range.

In addition, the reference voltage has been lowered to allow the device to produce output voltages down to 1.2V. Quiescent current has been reduced by a factor of two. Switch on resistance has been reduced by 30%. Switch transition times have been slowed to reduce EMI generation. The oscillator frequency has been reduced to 200kHz to maintain high efficiency over a wide output current range.

The pinout has been changed to improve PC layout by allowing the high current, high frequency switching circuitry to be easily isolated from low current, noise sensitive control circuitry. The new SO-8 package includes a fused ground lead that significantly reduces the thermal resistance of the device to extend the ambient operating temperature range. Standard surface mount external parts can be used including the inductor and capacitors.

Applications

Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power Systems

Part Models: 8
1ku List Price: Starting From $3.98

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
LT1578CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578CS8-2.5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578CS8-2.5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578IS8-2.5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1578IS8-2.5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LT1578CS8#PBF	PRODUCTION
LT1578CS8#TRPBF	PRODUCTION
LT1578CS8-2.5#PBF	PRODUCTION
LT1578CS8-2.5#TRPBF	PRODUCTION
LT1578IS8#PBF	PRODUCTION
LT1578IS8#TRPBF	PRODUCTION
LT1578IS8-2.5#PBF	PRODUCTION
LT1578IS8-2.5#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
LT1578CS8#PBF	PRODUCTION
LT1578CS8#TRPBF	PRODUCTION
LT1578CS8-2.5#PBF	PRODUCTION
LT1578CS8-2.5#TRPBF	PRODUCTION
LT1578IS8#PBF	PRODUCTION
LT1578IS8#TRPBF	PRODUCTION
LT1578IS8-2.5#PBF	PRODUCTION
LT1578IS8-2.5#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
LT1578CS8#PBF	PRODUCTION
LT1578CS8#TRPBF	PRODUCTION
LT1578CS8-2.5#PBF	PRODUCTION
LT1578CS8-2.5#TRPBF	PRODUCTION
LT1578IS8#PBF	PRODUCTION
LT1578IS8#TRPBF	PRODUCTION
LT1578IS8-2.5#PBF	PRODUCTION
LT1578IS8-2.5#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:

LT1578
LT1578-2.5

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.