LTC3403
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LTC3403

1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

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LTspice LTC3403 - Step-Down (Buck) Regulators Download 1.12 KB
Part Models 2
1ku List Price Starting From $2.85
Features
  • Dynamically Adjustable Output from 0.3V to 3.5V
  • Very Low Quiescent Current: Only 20µA During Operation
  • 600mA Output Current
  • Internal P-Channel MOSFET Bypass Transistor
  • High Efficiency: Up to 96%
  • 1.5MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 2.5V to 5V Input Voltage Range
  • Drives Optional External P-Channel MOSFET
  • Shutdown Mode Draws < 1µA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Available in 8-Lead 3mm x 3mm DFN Package
Additional Details
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The LTC3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input.

Supply current is only 20µA in Burst Mode® operation and drops to <1µA in shutdown. The 2.5V to 5V input voltage range makes the LTC3403 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

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.

The LTC3403 is available in a low profile 8-lead 3mm x 3mm DFN package.

Applications

  • WCDMA Cell Phone Power Amplifiers
  • Wireless Modems
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LTspice LTC3403 - Step-Down (Buck) Regulators Download 1.12 KB
Part Models 2
1ku List Price Starting From $2.85
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LTC3403

Documentation

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Data Sheet

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UPDATED 08/22/2007
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LTC3403: 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor Data Sheet

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UPDATED 08/09/2004
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LTC3403: バイパス・トランジスタ付き、1.5MHz、600mA同期整流式降圧レギュレータ データシート

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UPDATED 09/24/2009
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DC560A - Demo Manual redirect icon

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UPDATED 02/01/2004
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1.5MHz Monolithic Synchronous Step-Down Regulator Brings High Efficiency to WCDMA Cellular Telephone Applications redirect icon

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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.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3403EDD#PBF 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LTC3403EDD#TRPBF 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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Evaluation Kits 1

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DC560A

LTC3403EDD | WCDMA Cellular Phone Buck Regulator, 2.7V to 5V Input, Output @ 600mA

Evaluation Kits1

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DC560A

LTC3403EDD | WCDMA Cellular Phone Buck Regulator, 2.7V to 5V Input, Output @ 600mA

Tools & Simulations 2

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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LTC3403 - Step-Down (Buck) Regulators Download

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