LTC3402 - 2A, 3MHz Micropower Synchronous Boost Converter

Features

  • Synchronous Rectification: Up to 97% Efficiency
  • 2A Switch Current Rating
  • Fixed Frequency Operation Up to 3MHz
  • Wide Input Range: 0.5V to 5V
  • Very Low Quiescent Current: 38µA (Burst Mode Operation)
  • 2.6V to 5V Adjustable Output Voltage
  • 0.85V (Typ) Start-Up Voltage
  • No External Schottky Diode Required (VOUT < 4.3V)
  • Synchronizable Switching Frequency
  • Burst Mode Enable Control
  • Antiringing Control Reduces Switching Noise
  • PGOOD Output
  • OPTI-LOOP Compensation
  • Very Low Shutdown Current: <1µA
  • Small 10-Pin MSOP Package

Typical Application

LTC3402 Typical Application
LTC3402 Typical Application

Description

The LTC3402 is a high efficiency, fixed frequency, step-up DC/DC converter that operates from an input voltage below 1V. The device includes a 0.16 Ohms N-channel MOSFET switch and a 0.18 Ohms P-channel synchronous rectifier. Switching frequencies up to 3MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock. An external Schottky diode is optional but will slightly improve efficiency.

Quiescent current is only 38µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin has either a clock or is driven low, then fixed frequency switching is enabled.

Other features include a 1µA shutdown, antiringing control, open-drain power good output, thermal shutdown and current limit. The LTC3402 is available in the 10-lead thermally enhanced MSOP package. Lower current applications should use the 1A rated LTC3401 synchronous boost converter. Applications that require VOUT < 2.6V should use the LTC3424.

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
LTC3402EMS#PBF MS-10 MS E 05-08-1661 Yes
LTC3402EMS#TRPBF MS-10 MS E 05-08-1661 Yes


LTC3402 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
LTC3402EMS#PBF MS-10 E $4.14 $3.50 Yes
LTC3402EMS#TRPBF MS-10 E $3.56 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
DC409A LTC3402EMS | Synchronous Boost Converter, Vin=1 to 4.5V, Vout=3.3V or 5V $75.00
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Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Handheld Computers
  • MP3 Players
  • 2-Way Pagers
  • GPS Receivers
  • Battery Backup Supplies
  • CCFL Backlights

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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:
LTC3402

Technical Support