LT1959
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LT1959

4.5A, 500kHz Step-Down Switching Regulator

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Info: : PRODUCTION tooltip
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Part Details
Part Models 8
1ku List Price Starting From $5.48
Features
  • Operates with Input as Low as 4V
  • Output Range Down to 1.21V
  • Constant 500kHz Switching Frequency
  • Uses All Surface Mount Components
  • Inductor Size Reduced to 1.8µH
  • Saturating Switch Design: 0.07Ω
  • Shutdown Current: 20µA
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • 4.5A Switch
  • Current Mode Control
Additional Details
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The LT1959 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1506 but optimized for lower output voltage applications. It will operate down to 1.21V output compared to 2.42V for the LT1506. 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.

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 LT1959 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 Chargers
  • Distributed Power
  • 5V to 3.3V Conversion
  • 5V to 2.5V Conversion
  • 5V to 1.8V Conversion
Part Models 8
1ku List Price Starting From $5.48

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LT1959CR#TRPBF
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LT1959CS8#PBF
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LT1959CS8#TRPBF
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LT1959IR#PBF
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LT1959IR#TRPBF
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LT1959IS8#PBF
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LT1959IS8#TRPBF
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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

LT1959CR#PBF

PRODUCTION

LT1959CR#TRPBF

PRODUCTION

LT1959IR#PBF

PRODUCTION

LT1959IR#TRPBF

PRODUCTION

Oct 12, 2022

- 22_0255

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

LT1959CS8#PBF

PRODUCTION

LT1959CS8#TRPBF

PRODUCTION

LT1959IS8#PBF

PRODUCTION

LT1959IS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

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

LT1959CS8#PBF

PRODUCTION

LT1959CS8#TRPBF

PRODUCTION

LT1959IS8#PBF

PRODUCTION

LT1959IS8#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 10, 2022

- 22_0175

arrow down

Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark

LT1959CR#PBF

PRODUCTION

LT1959CR#TRPBF

PRODUCTION

LT1959IR#PBF

PRODUCTION

LT1959IR#TRPBF

PRODUCTION

Oct 12, 2022

- 22_0255

arrow down

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

LT1959CS8#PBF

PRODUCTION

LT1959CS8#TRPBF

PRODUCTION

LT1959IS8#PBF

PRODUCTION

LT1959IS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

arrow down

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

LT1959CS8#PBF

PRODUCTION

LT1959CS8#TRPBF

PRODUCTION

LT1959IS8#PBF

PRODUCTION

LT1959IS8#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC356A

LT1959CR | 4.5A Switch, 500kHz Step-Down Regulator, 5V to 15VIN, 1.8VOUT @ 4A

reference details image

DC355A

LT1959CS8 | 4.5A Switch, 500kHz Step-Down Regulator, 5V to 15VIN, 1.8VOUT @ 4A

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.

Reference Designs

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link
View 1

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altera-nios-ii-embedded-evaluation-kit-cyclone-iii-edition

Circuits from the lab

tooltip Info:Circuits from the lab

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

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