LT3506 - Dual Monolithic 1.6A Step-Down Switching Regulator

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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3506 Typical Application
LT3506 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3506AEDHD#PBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LT3506AEDHD#TRPBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LT3506AEFE#PBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LT3506AEFE#TRPBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LT3506AIDHD#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LT3506AIDHD#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LT3506AIFE#PBF TSSOP-16 FE I 05-08-1663 (BA) Yes
LT3506AIFE#TRPBF TSSOP-16 FE I 05-08-1663 (BA) Yes
LT3506EDHD#PBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LT3506EDHD#TRPBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LT3506EFE#PBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LT3506EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LT3506IDHD#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LT3506IDHD#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LT3506IFE#PBF TSSOP-16 FE I 05-08-1663 (BA) Yes
LT3506IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BA) Yes


LT3506 Package Drawing
LT3506 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3506AEDHD#PBF 5x4 DFN-16 E $4.21 $2.95 Yes
LT3506AEDHD#TRPBF 5x4 DFN-16 E $3.01 Yes
LT3506AEFE#PBF TSSOP-16 E $4.36 $3.05 Yes
LT3506AEFE#TRPBF TSSOP-16 E $3.11 Yes
LT3506AIDHD#PBF 5x4 DFN-16 I $5.06 $3.54 Yes
LT3506AIDHD#TRPBF 5x4 DFN-16 I $3.60 Yes
LT3506AIFE#PBF TSSOP-16 I $5.23 $3.66 Yes
LT3506AIFE#TRPBF TSSOP-16 I $3.72 Yes
LT3506EDHD#PBF 5x4 DFN-16 E $4.21 $2.95 Yes
LT3506EDHD#TRPBF 5x4 DFN-16 E $3.01 Yes
LT3506EFE#PBF TSSOP-16 E $4.36 $3.05 Yes
LT3506EFE#TRPBF TSSOP-16 E $3.11 Yes
LT3506IDHD#PBF 5x4 DFN-16 I $5.06 $3.54 Yes
LT3506IDHD#TRPBF 5x4 DFN-16 I $3.60 Yes
LT3506IFE#PBF TSSOP-16 I $5.23 $3.66 Yes
LT3506IFE#TRPBF TSSOP-16 I $3.72 Yes
Buy NowRequest Samples
* 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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC958A LT3506/LT3506A Demo Board | 2 Circuits, Dual, 25V, 1.6A Monolithic Step-Down Converter Contact Factory
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3506AIDHD#PBF 5x4 DFN-16 I $5.06 $3.54 Yes
LT3506AIDHD#TRPBF 5x4 DFN-16 I $3.60 Yes
LT3506AIFE#PBF TSSOP-16 I $5.23 $3.66 Yes
LT3506AIFE#TRPBF TSSOP-16 I $3.72 Yes
LT3506IDHD#PBF 5x4 DFN-16 I $5.06 $3.54 Yes
LT3506IDHD#TRPBF 5x4 DFN-16 I $3.60 Yes
LT3506IFE#PBF TSSOP-16 I $5.23 $3.66 Yes
LT3506IFE#TRPBF TSSOP-16 I $3.72 Yes
Buy NowRequest Samples
* 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.

Applications

  • Disk Drives
  • DSP Power Supplies
  • Wall Transformer Regulation
  • Distributed Power Regulation
  • DSL Modems
  • Cable Modems

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3506
LT3506A

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT3506
LT3506A

Technical Support