LTC3407 - Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator

Features

  • High Efficiency: Up to 96%
  • Very Low Quiescent Current: Only 40µA
  • 1.5MHz Constant Frequency Operation
  • High Switch Current: 1A on Each Channel
  • No Schottky Diodes Required
  • Low RDS(ON) Internal Switches: 0.35 Ohm
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Ultralow Shutdown Current: IQ < 1µA
  • Output Voltages from 5V down to 0.6V
  • Power-On Reset Output
  • Externally Sychronizable Oscillator
  • Small Thermally Enhanced MSOP Package and 3mm x 3mm DFN Packages

Typical Application

LTC3407 Typical Application
LTC3407 Typical Application

Description

The LTC3407 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 1.5MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade-off ripple noise for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while pulse-skipping mode provides low ripple noise at light loads.

To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA.

  Iout Fsw Features
LTC3407 2x 600mA 1.5MHz
LTC3407-2 2x 800mA 2.25MHz  -
LTC3407-3 2x 800mA 2.25MHz Fixed 1.8V/3.3V
LTC3407-4 2x 800mA 2.25MHz Reduced POR Delay
LTC3407A 2x 600mA 1.5MHz Low Ripple Burst Mode
LTC3407A-2 2x 800mA 2.25MHz Low Ripple Burst Mode

Packaging

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

MS-10, DFN-10

LTC3407 Package Drawing
LTC3407 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3407AEDD#PBF DFN 10 E $3.71 $2.60 View
LTC3407AEDD#TRPBF DFN 10 E $2.66 View
LTC3407AEDD-2 DFN 10 E $4.21 $2.95 View
LTC3407AEDD-2#PBF DFN 10 E $4.21 $2.95 View
LTC3407AEDD-2#TR DFN 10 E $3.01 View
LTC3407AEDD-2#TRPBF DFN 10 E $3.01 View
LTC3407AEMSE#PBF MSOP 10 E $3.71 $2.60 View
LTC3407AEMSE#TRPBF MSOP 10 E $2.66 View
LTC3407AEMSE-2 MSOP 10 E $4.21 $2.95 View
LTC3407AEMSE-2#PBF MSOP 10 E $4.21 $2.95 View
LTC3407AEMSE-2#TR MSOP 10 E $3.01 View
LTC3407AEMSE-2#TRPBF MSOP 10 E $3.01 View
LTC3407AIDD DFN 10 I $4.27 $2.99 View
LTC3407AIDD#PBF DFN 10 I $4.27 $2.99 View
LTC3407AIDD#TR DFN 10 I $3.05 View
LTC3407AIDD#TRPBF DFN 10 I $3.05 View
LTC3407AIDD-2 DFN 10 I $4.84 $3.39 View
LTC3407AIDD-2#PBF DFN 10 I $4.84 $3.39 View
LTC3407AIDD-2#TR DFN 10 I $3.45 View
LTC3407AIDD-2#TRPBF DFN 10 I $3.45 View
LTC3407AIMSE MSOP 10 I $4.27 $2.99 View
LTC3407AIMSE#PBF MSOP 10 I $4.27 $2.99 View
LTC3407AIMSE#TR MSOP 10 I $3.05 View
LTC3407AIMSE#TRPBF MSOP 10 I $3.05 View
LTC3407AIMSE-2 MSOP 10 I $4.84 $3.39 View
LTC3407AIMSE-2#PBF MSOP 10 I $4.84 $3.39 View
LTC3407AIMSE-2#TR MSOP 10 I $3.45 View
LTC3407AIMSE-2#TRPBF MSOP 10 I $3.45 View
LTC3407EDD DFN 10 E $3.71 $2.60 View
LTC3407EDD#PBF DFN 10 E $3.71 $2.60 View
LTC3407EDD#TR DFN 10 E $2.66 View
LTC3407EDD#TRPBF DFN 10 E $2.66 View
LTC3407EDD-2 DFN 10 E $4.21 $2.95 View
LTC3407EDD-2#PBF DFN 10 E $4.21 $2.95 View
LTC3407EDD-2#TR DFN 10 E $3.01 View
LTC3407EDD-2#TRPBF DFN 10 E $3.01 View
LTC3407EDD-3 DFN 10 E $4.21 $2.95 View
LTC3407EDD-3#PBF DFN 10 E $4.21 $2.95 View
LTC3407EDD-3#TR DFN 10 E $3.01 View
LTC3407EDD-3#TRPBF DFN 10 E $3.01 View
LTC3407EDD-4 DFN 10 E $4.21 $2.95 View
LTC3407EDD-4#PBF DFN 10 E $4.21 $2.95 View
LTC3407EDD-4#TR DFN 10 E $3.01 View
LTC3407EDD-4#TRPBF DFN 10 E $3.01 View
LTC3407EMSE MSOP 10 E $3.71 $2.60 View
LTC3407EMSE#PBF MSOP 10 E $3.71 $2.60 View
LTC3407EMSE#TR MSOP 10 E $2.66 View
LTC3407EMSE#TRPBF MSOP 10 E $2.66 View
LTC3407EMSE-2 MSOP 10 E $4.21 $2.95 View
LTC3407EMSE-2#PBF MSOP 10 E $4.21 $2.95 View
LTC3407EMSE-2#TR MSOP 10 E $3.01 View
LTC3407EMSE-2#TRPBF MSOP 10 E $3.01 View
LTC3407EMSE-4 MSOP 10 E $4.21 $2.95 View
LTC3407EMSE-4#PBF MSOP 10 E $4.21 $2.95 View
LTC3407EMSE-4#TR MSOP 10 E $3.01 View
LTC3407EMSE-4#TRPBF MSOP 10 E $3.01 View
LTC3407IDD-2#PBF DFN 10 I $4.84 $3.39 View
LTC3407IDD-2#TRPBF DFN 10 I $3.45 View
LTC3407IMSE-2#PBF MSOP 10 I $4.84 $3.39 View
LTC3407IMSE-2#TRPBF MSOP 10 I $3.45 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.

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
DC568A LTC3407EMSE Demo Board | (MSOP) Vin = 2.5V to 5.5V, Vout1 = 1.2V/1.5V/1.8V @ 600mA, Vout2 = 2.5V @ 600mA. $100.00
DC701A LTC3407EDD Demo Board | (DFN) Vin = 2.5V to 5.5V, Vout1 = 1.2V / 1.5V / 1.8V @ 600mA, Vout2 = 2.5V @ 600mA. $100.00
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Click here to view our complete list of demo boards

Applications

  • PDAs/Palmtop PCs
  • Digital Cameras
  • Cellular Phones
  • Portable Media Players
  • PC Cards
  • Wireless and DSL Modems

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Design Tools

LTpowerCAD

The LTpowerCAD II 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:
LTC3407 (Dual Channel)
LTC3407 (Single Channel)
LTC3407-2 (Dual Channel)
LTC3407-2 (Single Channel)
LTC3407-3 (1.8Vo)
LTC3407-3 (3.3Vo)
LTC3407-4 (Dual Channel)
LTC3407-4 (Single Channel)

LTspiceIV

LTspice IV 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 IV

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 IV:
LTC3407
LTC3407-2
LTC3407-3
LTC3407-4
LTC3407A
LTC3407A-2

Technical Support