Overview

Features and Benefits

High Efficiency Step-Up DC/DC Converter and LDO

Step-Up
  • VIN: 0.68V to 5V, VOUT: 1.5V to 5.25V
    IOUT: 100mA at 3.3V, VIN >0.8V
  • 2.2MHz Fixed Frequency Operation
  • Synchronous Rectifier with Output Disconnect
  • Burst Mode Operation (Pin Selectable)
Linear LDO Regulator
  • VIN : 1.8V to 5.5V, VOUT: 0.6V to 5V
    IOUT: 100mA
  • 100mV Dropout Voltage at 50mA
  • 24dB Ripple Rejection at fSW
Combined
  •  Power Good Indicators
  •  Low-Battery Comparator
  •  30μA IQ
  •  Low Profile 3mm × 3mm × 0.75mm Package

Product Details

The LTC3537 combines a high efficiency, 2.2MHz step-up DC/DC converter with an independent 100mA low dropout regulator (LDO). The step-up converter starts from an input voltage as low as 0.68V and contains an internal 0.4Ω switch and a 0.6Ω synchronous rectifier that disconnects from the output when disabled in shutdown.

A switching frequency of 2.2MHz 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. Fixed frequency switching is maintained until a light load current is sensed, at which point Burst Mode® operation is engaged to maximize efficiency. For low noise operation, Burst Mode Operation can be disabled. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal overload protection.

The integrated LDO regulator provides a very low noise, programmable low dropout supply.

Applications

  • Wireless Microphones
  • Portable Medical instruments
  • Noise Cancelling/Portable Headsets
  • RF and Audio Power

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:

LTC3537

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.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.