LTC3525D-3.3

RECOMMENDED FOR NEW DESIGNS

400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode

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Overview

  • 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

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
LTC3525D-3.3
400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode
LTC3525D-3.3 Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3525-3
  • LTC3525-3.3
  • LTC3525-5
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
DC879A-A

LTC3525-3.3 Demo Board | Micropower Synchronous Step-Up, 1V to 3.2VIN, 3.3VOUT @ 140mA

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Product Details

Demonstration circuit 879 is a Micropower Synchronous Step-Up Converter with Output Disconnect featuring the LTC3525-3.3 and LTC3525-5. The LTC3525 is a high performance Burst Mode operation only, synchronous boost converter. The LTC3525 incorporates a feature that maximizes efficiency by adjusting the peak and valley of the inductor current as a function of load. The demo board has two assembly versions: DC879A-A and DC879A-B. The DC879A-A offers fixed 3.3V output. The DC879A-B offers fixed 5V output. They offer a compact, high efficiency solution in single cell or dual cell alkaline or Li-ion applications. Only three small external components are required.
DC879A-A
LTC3525-3.3 Demo Board | Micropower Synchronous Step-Up, 1V to 3.2VIN, 3.3VOUT @ 140mA
DC879A-A Evaluation Board DC879A-A Evaluation Board - Top View DC879A-A Evaluation Board - Bottom View DC879A-A - Schematic

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