LT3506
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LT3506

Dual Monolithic 1.6A Step-Down Switching Regulator

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Part Details
Part Models 16
1ku List Price Starting From $3.54
Features
  • Wide Input Voltage Range, 3.6V to 25V
  • Two 1.6A Output Switching Regulators with Internal Power Switches
  • Constant Switching Frequency
    • LT3506: 575kHz
    • LT3506A: 1.1MHz
  • Anti-Phase Switching Reduces Ripple
  • Accurate 0.8V Reference, ±1%
  • Independent Shutdown/Soft-Start Pins
  • Independent Power Good Indicators Ease Supply Sequencing
  • Uses Small Inductors and Ceramic Capacitors
  • Small 16-Lead Thermally Enhanced 5mm × 4mm DFN and TSSOP Surface Mount Packages
Additional Details
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The LT3506 is a dual current mode PWM step-down DC/DC converter with internal 2A power switches. Both converters are synchronized to a single oscillator and run with opposite phases, reducing input ripple current. The output voltages are set with external resistor dividers, and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power-good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.

The LT3506 switching frequency is 575kHz and the LT3506A is 1.1MHz. These high switching frequencies allow the use of tiny inductors and capacitors, resulting in a very small dual 1.6A output solution. Constant frequency and ceramic capacitors combine to produce low, predictable output ripple voltage. With its wide input range of 3.6V to 25V, the LT3506 regulates a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies. Current mode PWM architecture provides fast transient response with simple compensation components and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection.

Applications

  • Disk Drives
  • DSP Power Supplies
  • Wall Transformer Regulation
  • Distributed Power Regulation
  • DSL Modems
  • Cable Modems
Part Models 16
1ku List Price Starting From $3.54

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Apr 6, 2022

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC958A

LT3506/LT3506A Demo Board | 2 Circuits, Dual, 25V, 1.6A Monolithic Step-Down Converter

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DC958A

LT3506/LT3506A Demo Board | 2 Circuits, Dual, 25V, 1.6A Monolithic Step-Down Converter

LT3506/LT3506A Demo Board | 2 Circuits, Dual, 25V, 1.6A Monolithic Step-Down Converter

Product Detail

Demonstration circuit 958 is a Dual Monolithic 1.6A Step-Down Switching Regulator featuring the LT3506A and LT3506. The top half of the board features the LT3506A circuit and the bottom  half of the board features the LT3506 circuit. These two devices are nearly identical except for the switching frequency, and the two circuits are totally independent on the demo board. The LT3506A circuit switches at 1.1MHz and takes a 6.8V to 25V input voltage and generates a 5V and a 3.3V output, both at 1.6A. The LT3506 circuit switches at 575kHz and takes a 3.6V to 21V input and generates a 1.8V and a 1.2V output, both at 1.6A.

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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