LTC3525L-3 - 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect

Features

  • Start-Up at 0.7V Typical, 0.88V Guaranteed
  • Up to 95% Efficiency
  • Output Disconnect and Inrush Current Limit
  • 3V Fixed Output Voltage
  • Delivers 65mA at 3V from a 1V Input or 160mA from a 1.8V Input
  • Burst Mode® Operation: IQ = 7μA
  • VIN: 0.5V to 4.5V
  • Only Three External Components
  • VIN > VOUT Operation
  • <1μA Shutdown Current
  • Anti-Ringing Control
  • Short-Circuit and Overtemperature Protection
  • Tiny 6-Pin SC70 Package

Typical Application

LTC3525L-3 Typical Application
LTC3525L-3 Typical Application

Description

The LTC3525L-3 is a high efficiency synchronous step-up DC/DC converter with output disconnect that can start up with an input as low as 0.7V. It offers a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline applications. Only three small external components are required. The LTC3525L-3 generates a fixed 3V output voltage.

The device includes a 0.5 N-channel MOSFET switch and a 0.85 P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7μA, maximizing battery life in portable applications.

Other features include <1μA shutdown current, antiringing control and thermal shutdown. The LTC3525L-3 is available in a tiny 6-pin SC70 package.

  Vout Min Startup Voltage Features
LTC3525-3/3.3/5 3V/3.3V/5V 1V Output Disconnect
LTC3525D-3.3 3.3V 0.85V Pass Through Mode
LTC3525L-3 3V 0.85V Output Disconnect

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
LTC3525LESC6-3#TRMPBF SC-70 SC6 E 05-08-1638 Yes
LTC3525LESC6-3#TRPBF SC-70 SC6 E 05-08-1638 Yes


LTC3525L-3 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
LTC3525LESC6-3#TRMPBF SC-70 E $2.71 $1.95 Yes
LTC3525LESC6-3#TRPBF SC-70 E $2.71 $1.90 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.

Click here to view our complete list of demo boards

Applications

  • MP3 Players
  • Portable Instruments
  • Glucose Meters
  • Digital Cameras

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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:
LTC3525-3
LTC3525-3.3
LTC3525-5

Technical Support