LTC3526

PRODUCTION

500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN

Data Sheet (Rev. E) Product Selection Table
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Overview

  • Delivers 3.3V at 100mA from a Single Alkaline/NiMH Cell or 3.3V at 200mA from Two Cells
  • VIN Start-Up Voltage: 850mV
  • 1.6V to 5.25V VOUT Range
  • Up to 94% Efficiency
  • Output Disconnect
  • 1MHz Fixed Frequency Operation
  • VIN > VOUT Operation
  • Integrated Soft-Start
  • Current Mode Control with Internal Compensation
  • Automatic Burst Mode® Operation with 9μA Quiescent Current (LTC3526)
  • Low Noise PWM Operation (LTC3526B)
  • Internal Synchronous Rectifier
  • Logic Controlled Shutdown (IQ < 1μA)
  • Anti-Ringing Control
  • Low Profile (2mm × 2mm × 0.75mm) DFN Package

The LTC3526/LTC3526B are synchronous, fixed frequency step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 2mm DFN package. Battery life in single AA/AAA powered products is extended further with an 850mV start-up voltage and operation down to 500mV once started.

A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3526 features automatic Burst Mode operation at light load conditions, while the LTC3526B features continuous switching at light loads. Anti-ringing control circuitry also reduces EMI concerns by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal shutdown.

The LTC3526/LTC3526B are housed in a 2mm × 2mm × 0.75mm DFN package.

For new designs, we recommend the LTC3526L/LTC3526LB.

  Startup Voltage Frequency Burst Mode Notes
LTC3526 1V 1MHz Yes Not Recommended For New Designs
LTC3526B 1V 1MHz No Not Recommended For New Designs
LTC3526-2 1V 2MHz Yes Not Recommended For New Designs
LTC3526B-2 1V 2MHz No Not Recommended For New Designs
LTC3526L 0.85V 1MHz Yes  
LTC3526LB 0.85V 1MHz No  
LTC3526L-2 0.85V 2MHz Yes  
LTC3526LB-2 0.85V 2MHz No  

Applications

  • Medical Instruments
  • Flash-Based MP3 Players
  • Noise Canceling Headphones
  • Wireless Mice
  • Bluetooth Headsets
LTC3526
500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN
LTC3526 Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC3526L
LTC3526LB
550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3526
  • LTC3526-2
  • LTC3526B
  • LTC3526B-2
  • LTC3526L
  • LTC3526L-2
  • LTC3526LB
  • LTC3526LB-2
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.

Latest Discussions

2 Years Ago
LTC3526 Startup Issues
6 Years Ago
LTC3526-2 Quiescent Current Consumption
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