Power Management Switching Regulator Step-Up (Boost) Regulators Micropower Boost
Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost
 Power Management PMIC & Multifunction Multitopology DC/DC

LTC3537 - 2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO

Features

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

Typical Application

LTC3537 Typical Application
LTC3537 Typical Application

Description

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.

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
LTC3537EUD#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3537EUD#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes


LTC3537 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
LTC3537EUD#PBF 3x3 QFN-16 E $3.43 $2.40 Yes
LTC3537EUD#TRPBF 3x3 QFN-16 E $2.46 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.

Part Number Description Price Documentation
DC1242A LTC3537EUD | 600mA (I sw) Synchronous Boost Converter and 100mA LDO in 3mmmm x 3mm QFN $150.00
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Click here to view our complete list of demo boards

Applications

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

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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:
LTC3537

Technical Support