Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost

LTC3428 - 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm × 3mm DFN

Features

  • 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

Typical Application

LTC3428 Typical Application
LTC3428 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC3428EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LTC3428EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes


LTC3428 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC3428EDD#PBF 3x3 DFN-10 E $4.17 $3.50 Yes
LTC3428EDD#TRPBF 3x3 DFN-10 E $3.60 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC700A LTC3428EDD | 2.4MHz, 2-Phase Boost Converter, Vin = 1.6V - 4.5V, Vout = 3.3V/5V $125.00
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Click here to view our complete list of demo boards

Applications

  • Networking Equipment
  • Handheld Instruments
  • Digital Cameras
  • Distributed Power
  • Local 3.3V to 5V Conversion

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3428

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