LTC3547

PRODUCTION

Dual Monolithic 300mA Synchronous Step-Down Regulator

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Part Details

  • High Efficiency Dual Step-Down Outputs: Up to 96%
  • 300mA Output Current per Channel at VIN = 3V
  • Automatic Low Ripple Burst Mode Operation (20mVP-P).
  • Only 40µA Quiescent Current During Operation (Both Channels)
  • 2.25MHz Constant-Frequency Operation
  • 2.5V to 5.5V Input Voltage Range
  • Low Dropout Operation: 100% Duty Cycle
  • Internally Compensated for All Ceramic Capacitors
  • Independent Internal Soft-Start for Each Channel
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.6V Reference Allows Low Output Voltages
  • Short-Circuit Protected
  • Ultralow Shutdown Current: IQ < 1µA
  • Low Profi le (0.75mm) 8-Lead 3mm × 2mm DFN Package
LTC3547
Dual Monolithic 300mA Synchronous Step-Down Regulator
Dual Monolithic Buck Regulator in 8-Lead 3mm × 2mm DFN Effi ciency vs Output Current for VOUT = 2.5V Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 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
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Single-Supply Monitors 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3547
  • LTC3547-1
  • LTC3547B
  • LTC3547B-1

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3547
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
DC1013A

LTC3547EDDB | Dual Monolithic Synchronous Buck Converter

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Product Details

Demonstration circuit 1013 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3547 monolithic dual synchronous buck regulator IC. The DC1013 has an input voltage range of 2.5V to 5.5V, and both outputs are capable of delivering up to 300 mA of output current at a minimum input voltage of 3V. In Burst Mode® operation, which is the mode of the LTC3547 during light load current operation, the DC supply current of the DC1013 is typically only 40 uA (per channel) at no load, and less than 1 uA in shutdown. The DC1013 is a very efficient circuit: over 95% for either circuit. The LTC3547 comes in a tiny 8-lead 3 × 2 mm DFN package, which has an exposed pad on the bottom-side of the IC for better thermal performance.
DC1013A
LTC3547EDDB | Dual Monolithic Synchronous Buck Converter
DC1013A - Schematic

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