LTC3425

RECOMMENDED FOR NEW DESIGNS

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

Part Models: 2
1ku List Price: Starting From $5.81

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Overview

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

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 R_DS(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 (V_OUT < 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

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
LTC3425EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3425EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3425EUH#PBF	PRODUCTION
LTC3425EUH#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3425

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.

Evaluation Kits

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

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Product Details

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.