LTC6908 - Dual Output Oscillator with Spread Spectrum Modulation
LTC6909 - 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

LT1959 - 4.5A, 500kHz Step-Down Switching Regulator

Features

  • Click Here For LT1959 Evaluation Kits
  • 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: 0.07 Ohms
  • Shutdown Current: 20µA
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • 4.5A Switch
  • Current Mode Control

Typical Application

LT1959
LT1959
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Description

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.

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Packaging

SO-8,DD-7

LT1959
LT1959
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1959CR DD PAK 7 C $5.61 $4.74 View
LT1959CR#PBF DD PAK 7 C $5.61 $4.74 View
LT1959CR#TR DD PAK 7 C   $4.86 View
LT1959CR#TRPBF DD PAK 7 C   $4.86 View
LT1959CS8 SO 8 C $5.19 $4.39 View
LT1959CS8#PBF SO 8 C $5.19 $4.39 View
LT1959CS8#TR SO 8 C   $4.45 View
LT1959CS8#TRPBF SO 8 C   $4.45 View
LT1959IR DD PAK 7 I $6.39 $5.40 View
LT1959IR#PBF DD PAK 7 I $6.39 $5.40 View
LT1959IR#TR DD PAK 7 I   $5.52 View
LT1959IR#TRPBF DD PAK 7 I   $5.52 View
LT1959IS8 SO 8 I $5.98 $5.05 View
LT1959IS8#PBF SO 8 I $5.98 $5.05 View
LT1959IS8#TR SO 8 I   $5.11 View
LT1959IS8#TRPBF SO 8 I   $5.11 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number Description Price
DC356A LT1959CR | 4.5A Switch, 500kHz Step-Down Regulator, 5V to 15Vin, 1.8Vout @ 4A $150.00
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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
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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