Overview

Features and Benefits

  • VOUT Connected to VIN in Shutdown
  • Up to 95% Efficiency
  • 0.85V Minimum Input Start-Up Voltage
  • Fixed Output Voltage of 3.3V
  • Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input
  • Burst Mode® Operation: IQ = 7μA
  • VIN Range: 0.5V to 4.5V
  • Only Three External Components
  • VIN > VOUT Operation
  • Anti-Ringing Control
  • Short-Circuit and Overtemperature Protection
  • Very Low Profile of 1mm
  • Tiny 6-Lead SC70 Package

Product Details

The LTC3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low as 0.85V. It offers a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525D features a fixed output voltage of 3.3V. In shutdown, VOUT is connected to VIN through the inductor.

The device includes a 0.5Ω N-channel MOSFET switch and a 0.8Ω 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 anti-ringing control and thermal shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package.

List of LTC3525 Options
PART NAME
INPUT START-UP VOLTAGE OUTPUT VOLTAGE VOUT STATUS IN SHUTDOWN MODE
LTC3525-3 0.85V 3V Output Disconnect
LTC3525-3.3 0.85V 3.3V Output Disconnect
LTC3525-5 0.85V 5V Output Disconnect
LTC3525D-3.3 0.85V 3.3V Pass Through Mode
LTC3525L-3 0.7V 3V Output Disconnect

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

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.

LTspice

Models for the following parts are available in LTspice:

LTC3525-3
LTC3525-3.3
LTC3525-5

Design Resources

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.

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.