LTC3412A - 3A, 4MHz, Monolithic Synchronous Step-Down Regulator

Features

  • High Efficiency: Up to 95%
  • 3A Output Current
  • Low Quiescent Current: 64μA
  • Low RDS(ON) Internal Switch: 77mΩ
  • 2.25V to 5.5V Input Voltage Range
  • Programmable Frequency: 300kHz to 4MHz
  • ±2% Output Voltage Accuracy
  • 0.8V Reference Allows Low Output Voltage
  • Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp
  • Synchronizable Switching Frequency
  • Low Dropout Operation: 100% Duty Cycle
  • Power Good Output Voltage Monitor
  • Overtemperature Protected
  • Available in 16-Lead Exposed Pad TSSOP and QFN Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3412A Typical Application
LTC3412A Typical Application

Description

The LTC3412A is a high efficiency monolithic synchronous, step-down DC/DC converter utilizing a constant frequency, current mode architecture. It operates from an input voltage range of 2.25V to 5.5V and provides a regulated output voltage from 0.8V to 5V while delivering up to 3A of output current. The internal synchronous power switch with 77mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. Switching frequency is set by an external resistor or can be synchronized to an external clock. 100% duty cycle provides low dropout operation extending battery life in portable systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3412A can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference while Burst Mode operation provides high efficiency by reducing gate charge losses at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the application requirements.

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
LTC3412AEFE#PBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LTC3412AEFE#TRPBF TSSOP-16 FE E 05-08-1663 (BA) Yes
LTC3412AEUF#PBF 4x4 QFN-16 UF E 05-08-1692 Yes
LTC3412AEUF#TRPBF 4x4 QFN-16 UF E 05-08-1692 Yes
LTC3412AIFE#PBF TSSOP-16 FE I 05-08-1663 (BA) Yes
LTC3412AIFE#TRPBF TSSOP-16 FE I 05-08-1663 (BA) Yes
LTC3412AIUF#PBF 4x4 QFN-16 UF I 05-08-1692 Yes
LTC3412AIUF#TRPBF 4x4 QFN-16 UF I 05-08-1692 Yes
LTC3412AMPFE TSSOP-16 FE MP 05-08-1663 (BA) No
LTC3412AMPFE#PBF TSSOP-16 FE MP 05-08-1663 (BA) Yes
LTC3412AMPFE#TR TSSOP-16 FE MP 05-08-1663 (BA) No
LTC3412AMPFE#TRPBF TSSOP-16 FE MP 05-08-1663 (BA) Yes


LTC3412A Package Drawing
LTC3412A 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
LTC3412AEFE#PBF TSSOP-16 E $4.93 $3.45 Yes
LTC3412AEFE#TRPBF TSSOP-16 E $3.51 Yes
LTC3412AEUF#PBF 4x4 QFN-16 E $4.93 $3.45 Yes
LTC3412AEUF#TRPBF 4x4 QFN-16 E $3.51 Yes
LTC3412AIFE#PBF TSSOP-16 I $6.74 $4.72 Yes
LTC3412AIFE#TRPBF TSSOP-16 I $4.78 Yes
LTC3412AIUF#PBF 4x4 QFN-16 I $6.74 $4.72 Yes
LTC3412AIUF#TRPBF 4x4 QFN-16 I $4.78 Yes
LTC3412AMPFE TSSOP-16 MP $9.22 $6.45 No
LTC3412AMPFE#PBF TSSOP-16 MP $9.22 $6.46 Yes
LTC3412AMPFE#TR TSSOP-16 MP $6.51 No
LTC3412AMPFE#TRPBF TSSOP-16 MP $6.51 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
DC652A LTC3412AEFE Demo Board $100.00
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
LTC3412AIFE#PBF TSSOP-16 I $6.74 $4.72 Yes
LTC3412AIFE#TRPBF TSSOP-16 I $4.78 Yes
LTC3412AIUF#PBF 4x4 QFN-16 I $6.74 $4.72 Yes
LTC3412AIUF#TRPBF 4x4 QFN-16 I $4.78 Yes
LTC3412AMPFE#PBF TSSOP-16 MP $9.22 $6.46 Yes
LTC3412AMPFE#TRPBF TSSOP-16 MP $6.51 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

  • Point-of-Load Regulation
  • Notebook Computers
  • Portable Instruments
  • Distributed Power Systems

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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:
LTC3412
LTC3412A

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

To open the project file for this circuit:

  • Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
  • Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
  • Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu

Design tools for the following parts are available in LTpowerCAD:
LTC3412
LTC3412A

Technical Support