LTC3406B - 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

Features

  • High Efficiency: Up to 96%
  • 600mA Output Current at VIN = 3V
  • 2.5V to 5.5V Input Voltage Range
  • 1.5MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • Low Quiescent Current: 300µA
  • 0.6V Reference Allows Low Output Voltages
  • Shutdown Mode Draws <1µA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Low Profile (1mm) ThinSOT™ Package

Typical Application

LTC3406B Typical Application
LTC3406B Typical Application

Description

The LTC3406B is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current with no load is 300µA and drops to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406B ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3406B is available in a low profile (1mm) ThinSOT package. Refer to LTC3406 for applications that require Burst Mode® operation.

Protected by U.S. Patents, including 6580258, 5481178.

  Vout Fsw Features
LTC3406 Adj. 1.5MHz  Burst Mode
LTC3406-1.2 1.2V 1.5MHz   Burst Mode
LTC3406-1.5 1.5V 1.5MHz  Burst Mode
LTC3406-1.8 1.8V 1.5MHz  Burst Mode
LTC3406B Adj. 1.5MHz Burst Mode Disabled
LTC3406B-1.2 1.2V 1.5MHz Burst Mode Disabled
LTC3406B-2 Adj. 2.25MHz Burst Mode Disabled
LTC3406A Adj. 1.5MHz Low Ripple Burst Mode
LTC3406AB Adj. 1.5MHz Burst Mode Disabled
LTC3406AB-2 Adj. 2.25MHz Burst Mode Disabled

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
LTC3406BES5-1.5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC3406BES5-1.5#TRPBF SOT-23 S5 E 05-08-1635 Yes
LTC3406BES5-1.8#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC3406BES5-1.8#TRPBF SOT-23 S5 E 05-08-1635 Yes
LTC3406BES5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC3406BES5#TRPBF SOT-23 S5 E 05-08-1635 Yes


LTC3406B Package Drawing
LTC3406B 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
LTC3406BES5-1.5#TRMPBF SOT-23 E $2.86 $2.03 Yes
LTC3406BES5-1.5#TRPBF SOT-23 E $2.86 $2.01 Yes
LTC3406BES5-1.8#TRMPBF SOT-23 E $2.86 $2.03 Yes
LTC3406BES5-1.8#TRPBF SOT-23 E $2.86 $2.01 Yes
LTC3406BES5#TRMPBF SOT-23 E $2.86 $2.03 Yes
LTC3406BES5#TRPBF SOT-23 E $2.86 $2.01 Yes
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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.

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
DC500A-D LTC3406BES5 Demo Board | 2.7V to 5.5Vin, 1.2Vout @ 600mA(max) $75.00
DC500A-E LTC3406BES5-1.5 Demo Board | 2.7V to 5.5Vin, 1.5Vout @ 600mA(max) $75.00
DC500A-F LTC3406BES5-1.8 Demo Board | 2.7V to 5.5Vin, 1.8Vout @ 600mA(max) $75.00
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Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments

Product Notifications

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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:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

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

Models for the following parts are available in LTspice:
LTC3406
LTC3406-1.2
LTC3406-1.5
LTC3406-1.8
LTC3406A
LTC3406AB
LTC3406B
LTC3406B-1.2
LTC3406B-1.5
LTC3406B-1.8
LTC3406B-2

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:
LT3406B
LTC3406
LTC3406-1.2
LTC3406-1.5
LTC3406-1.8
LTC3406A
LTC3406AB
LTC3406AB-2
LTC3406B
LTC3406B-1.2
LTC3406B-2

Technical Support