LTC3549

PRODUCTION

250mA Low VIN Buck Regulator in 2mm × 3mm DFN

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Overview

  • 1.6V to 5.5V Input Voltage Range
  • Internal Soft-Start
  • Low Ripple Burst Mode® Operation
    • Output Ripple: <20mVP-P
    • IQ: 50µA
  • 2.25MHz Constant-Frequency Operation
  • High Effi ciency: Up to 93%
  • 250mA Output Current (VIN = 1.8V, VOUT = 1.2V)
  • 450mA Peak Inductor Current
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • 0.611V Reference Voltage
  • Stable with Ceramic Capacitors
  • Shutdown Mode Draws <1µA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protection
  • Available in a Low Profi le (0.75mm) 6-Lead (2mm × 3mm) DFN Package
LTC3549
250mA Low VIN Buck Regulator in 2mm × 3mm DFN
High Efficiency Step-Down Converter Burst Mode Efficiency, VOUT = 1.5V Product Package 1
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Documentation

Data Sheet 1

User Guide 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Ideal Diodes and PowerPath Controllers 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3549

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3549
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC992A

LTC3549EDCB Demo Board

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Product Details

Demonstration circuit 992 is a Step-Down Converter, using the LTC3549 monolithic synchronous buck regulator. The DC992A has an input voltage range of 1.6V to 5.5V, and is  capable of delivering up to 250 mA of output current at a minimum input voltage of 1.8V. The output voltage of the DC992A can be set as low as 0.611V, the reference voltage of the LTC3549. At low load currents, the DC992A can operate in either noise sensitive applications, due to the capability of the LTC3549 to operate in pulse-skipping mode, or in high  efficiency applications, because the LTC3549 can also operate in Burst-Mode.
DC992A
LTC3549EDCB Demo Board
DC992A - Schematic

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