LTC3425
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3425

5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Models 2
1ku List Price Starting From $5.81
Features
  • High Efficiency: Up to 95%
  • Up to 3A Continuous Output Current
  • 4-Phase Operation for Low Output Ripple and Tiny Solution Size
  • Output Disconnect and Inrush Current Limiting
  • Very Low Quiescent Current: 12µA
  • 0.5V to 4.5V Input Range
  • 2.4V to 5.25V Adjustable Output Voltage
  • Adjustable Current Limit
  • Adjustable, Fixed Frequency Operation from 100kHz to 2MHz per Phase
  • Synchronizable Oscillator with Sync Output
  • Internal Synchronous Rectifiers
  • Manual or Automatic Burst Mode® Operation
  • Power Good Comparator
  • <1µA Shutdown Current
  • Antiringing Control
  • 5mm x 5mm Thermally Enhanced QFN Package
Additional Details
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The LTC3425 is a synchronous, 4-phase boost converter with output disconnect capable of operation below 1V input. It includes four N-channel MOSFET switches and four P-channel synchronous rectifiers for an effective RDS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase operation greatly reduces peak inductor currents, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes. True output disconnect eliminates inrush current and allows zero load current in shutdown. External Schottky diodes are not required in most applications (VOUT < 4.3V). Power saving Burst Mode operation can be user controlled or left in automatic mode.

Other features include 1µA shutdown current, programmable frequency with sync in and out, programmable soft-start, antiringing control, thermal shutdown, adjustable current limit, reference output and power good comparator.

The LTC3425 is available in a small, thermally enhanced 32-pin QFN package.

Applications

  • Handheld Computers
  • Point-of-Load Regulators
  • 3.3V to 5V Conversion
Part Models 2
1ku List Price Starting From $5.81

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3425EUH#PBF
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LTC3425EUH#TRPBF
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Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Reset Filters

Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Software & Part Ecosystem

Evaluation Kits 2

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DC616B

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

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DC616B

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 5VOUT1 @ 2A, 5VOUT2 @ 1.5A

Product Detail

Demonstration Circuit 616 is a synchronous, 4-phase boost converter using the LTC3425. It is capable of operating below 1V input. DC616A is set for 3.3V output. DC616B is set for 5V output. On each demo board, the left circuit gives higher efficiency and current rating; while the right circuit has smaller size and lower cost. The switching frequency is set at 1MHz per phase, minimizing inductor and capacitor size. A single resistor at RT pin sets the frequency. If desired, the LTC3425 can be synchronized to an external clock.

reference details image

DC616A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

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DC616A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

LTC3425EUH | 4MHz, Polyphase, 2V to 3VIN, 2 Circuits, 3.3VOUT1 @ 2.25A, 3.3VOUT2 @ 1.8A

Product Detail

Demonstration Circuit 616 is a synchronous, 4-phase boost converter using the LTC3425. It is capable of operating below 1V input. DC616A is set for 3.3V output. DC616B is set for 5V output. On each demo board, the left circuit gives higher efficiency and current rating; while the right circuit has smaller size and lower cost. The switching frequency is set at 1MHz per phase, minimizing inductor and capacitor size. A single resistor at RT pin sets the frequency. If desired, the LTC3425 can be synchronized to an external clock.

Tools & Simulations 1

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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