LTC3407-3
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LTC3407-3

Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator

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LTspice LTC3407-3 - Step-Down (Buck) Regulators Download 1.47 KB
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Features
  • Very Low Quiescent Current: Only 40µA
  • 1.8V at 800mA/3.3V at 800mA
  • High Efficiency: Up to 95%
  • 2.25MHz Constant Frequency Operation
  • High Switch Current: 1.2A on Each Channel
  • No Schottky Diodes Required
  • Low RDS(ON) Internal Switches: 0.35Ω
  • VIN: 3.3V to 5.5V
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Ultralow Shutdown Current: IQ < 1µA
  • Power-On Reset Output
  • Externally Synchronizable Oscillator
  • Small Thermally Enhanced 3mm × 3mm DFN Package
Additional Details
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The LTC3407-3 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 3.3V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.0mm. Internal synchronous 0.35Ω, 1.2A 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 noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while Pulse Skip Mode provides low noise ripple 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

Applications

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

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LTspice LTC3407-3 - Step-Down (Buck) Regulators Download 1.47 KB
Part Models 2
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LTC3407-3

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Data Sheet

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UPDATED 08/07/2009
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LTC3407-3: Dual Synchronous, 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator Data Sheet

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UPDATED 11/09/2009
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LTC3407-3: デュアル1.8V/0.8Aおよび3.3V/0/8A、2.25MHz、同期整流式降圧DC/DCレギュレータ データシート

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Documentation

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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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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