LT1578
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LT1578

1.5A, 200kHz Step-Down Switching Regulator

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LTspice LT1578 - Step-Down (Buck) Regulators Download 1.75 KB
Part Models 8
1ku List Price Starting From $3.98
Features
  • 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
Additional Details
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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
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Documentation View All Documentation
LTspice LT1578 - Step-Down (Buck) Regulators Download 1.75 KB
Part Models 8
1ku List Price Starting From $3.98
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LT1578

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Data Sheet

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UPDATED 08/30/2007
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LT1578: 1.5A, 200kHz Step-Down Switching Regulator Data Sheet

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Reliability Data

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UPDATED 03/26/2018
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User Guide

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UPDATED 09/24/2009
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Documentation

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) external-link
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LT1578CS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LT1578CS8-2.5#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1578CS8-2.5#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LT1578IS8#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1578IS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1578IS8-2.5#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1578IS8-2.5#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Product Lifecycle

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Oct 12, 2022

- 22_0254

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)

LT1578CS8#PBF

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LT1578CS8#TRPBF

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LT1578CS8-2.5#PBF

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LT1578CS8-2.5#TRPBF

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Qualification Results Summary

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Jun 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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

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PCN21_0060_Form

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Material_Report

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Delta Qualification Matrix

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PCN

Oct 12, 2022

- 22_0254

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)

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

pdf

PCN22_0254_Form

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xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

Download
Jun 11, 2021

- 21_0060

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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

pdf

PCN21_0060_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC303A

LT1578CS8 | 1.5A 200KHz Buck DC/DC with Shutdown & Sync, 5-15VIN, Jumper Selectable 3.3VOUT or 5VOUT @1.25A

Evaluation Kits1

evaluation kit item images

DC303A

LT1578CS8 | 1.5A 200KHz Buck DC/DC with Shutdown & Sync, 5-15VIN, Jumper Selectable 3.3VOUT or 5VOUT @1.25A
Tools & Simulations

Tools & Simulations 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.

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LT1578 - Step-Down (Buck) Regulators Download

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