LTC3428

RECOMMENDED FOR NEW DESIGNS

4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm × 3mm DFN

Data Sheet Product Selection Table
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Overview

  • High Efficiency: Up to 92%
  • 2-Phase Control Reduces Output Voltage Ripple
  • 5V at 2A from 3.3V Input
  • 3.3V at 1.5A from 1.8V Input
  • 1.6V to 5.25V Adjustable Output Voltage
  • 1.6V to 4.5V Input Range
  • Internal Soft-Start Operation
  • Low Shutdown Current: <1µA
  • Uses Small Surface Mount Components
  • 10-Pin 3mm × 3mm DFN Package

The LTC3428 is a 2-phase, current mode boost converter, capable of supplying 2A at 5V from a 3.3V input. Two 93mΩ, 2A N-channel MOSFET switches allow the LTC3428 to deliver high efficiency from input voltages as low as 1.6V.

External parts count and size are minimized by a 1MHz switching frequency and a 2-phase design. Two phase operation significantly reduces peak inductor currents and capacitor ripple current, doubling the effective switching frequency and minimizing inductor and capacitor size. External compensation allows the feedback loop response to be optimized for a particular application.

Other features include: an active low shutdown pin reduces supply current to below 1µA, internal soft-start, antiringing control and thermal shutdown. The LTC3428 is available in a low profile (0.75mm) 10-lead (3mm × 3mm) DFN package.

Applications

  • Networking Equipment
  • Handheld Instruments
  • Digital Cameras
  • Distributed Power
  • Local 3.3V to 5V Conversion
LTC3428
4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm × 3mm DFN
3.3V to 5V at 2A Converter Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Data Sheet

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

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3428
LTspice

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC700A

LTC3428EDD | 2.4MHz, 2-Phase Boost Converter, VIN = 1.6V - 4.5V, VOUT = 3.3V/5V

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Product Details

Demonstration circuit 700 is a 2.4MHz, Dual Phase Step-Up DC/DC Converter featuring the LTC3428EDD. The demo board demonstrates a dual phase DC/DC boost converter, with a 2A switch (per phase), capable of providing either 5V at 2A or 3.3V at 1.5A. The circuit demonstrates the advantages of the dual phase architecture for an effective switching frequency of 2.4MHz.
DC700A
LTC3428EDD | 2.4MHz, 2-Phase Boost Converter, VIN = 1.6V - 4.5V, VOUT = 3.3V/5V
DC700A Demo Board DC700A Demo Board DC700A Demo Board DC700A Demo Board DC700A Demo Board DC700A - Schematic

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