LTC3561

PRODUCTION

1A, 4MHz, Synchronous Step-Down DC/DC Converter

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Overview

  • Uses Tiny Capacitors and Inductor
  • High Frequency Operation: Up to 4MHz
  • High Switch Current: 1.4A
  • Low RDS(ON) Internal Switches: 0.110Ω
  • High Efficiency: Up to 95%
  • VIN: 2.63V to 5.5V
  • Stable with Ceramic Capacitors
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Short-Circuit Protected
  • Low Dropout Operation: 100% Duty Cycle
  • Low Shutdown Current: IQ ≤ 1µA
  • Low Quiescent Current: 240µA
  • Output Voltages from 0.8V to 5V
  • Low Noise Pulse-Skipping Operation
  • Small 8-Pin DFN Package

The LTC3561 is a constant-frequency, synchronous, step-down DC/DC converter. Intended for medium power applications, it operates from a 2.63V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal synchronous 0.11Ω power switches with 1.4A peak current ratings provide high efficiency. The LTC3561’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). The no-load quiescent current is only 240µA. In shutdown, the device draws <1µA.

Applications

  • Wireless LAN Power
  • Notebook Computers
  • Digital Cameras
  • Cellular Phones
  • Board Mounted Power Supplies
LTC3561
1A, 4MHz, Synchronous Step-Down DC/DC Converter
Step-Down 2.5V/1A Regulator Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
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:

  • LTC3561
  • LTC3561A

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3561
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.

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