LTC3601

PRODUCTION

1.5A, 15V Monolithic Synchronous Step-Down Regulator

Data Sheet Product Selection Table
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Overview

  • 4V to 15V Operating Input Voltage Range
  • 1.5A Output Current
  • Up to 96% Efficiency
  • Very Low Duty Cycle Operation: 5% at 2.25MHz
  • Adjustable Switching Frequency: 800kHz to 4MHz
  • External Frequency Synchronization
  • Current Mode Operation for Excellent Line and Load Transient Response
  • User Selectable Burst Mode® (No Load IQ = 300μA) or Forced Continuous Operation
  • 0.6V Reference Allows Low Output Voltages
  • Short-Circuit Protected
  • Output Voltage Tracking Capability
  • Programmable Soft-Start
  • Power Good Status Output
  • Available in Small, Thermally Enhanced, 16-Pin QFN (3mm × 3mm) and MSOP Packages

The LTC3601 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 1.5A of output current. The operating supply voltage range is from 4V to 15V, making it suitable for a wide range of power supply applications.

The operating frequency is programmable from 800kHz to 4MHz with an external resistor enabling the use of small surface mount inductors. For switching noise sensitive applications, the LTC3601 can be externally synchronized over the same frequency range. An internal phase-locked loop aligns the on-time of the top power MOSFET to the internal or external clock. This unique constant frequency/ controlled on-time architecture is ideal for high step-down ratio applications that demand high switching frequencies and fast transient response.

The LTC3601 offers two operational modes: Burst Mode operation and forced continuous mode to allow the user to optimize output voltage ripple, noise, and light load efficiency for a given application. Maximum light load efficiency is achieved with the selection of Burst Mode operation while forced continuous mode provides minimum output ripple and constant frequency operation.

Applications

  • Distributed Power Systems
  • Lithium-Ion Battery-Powered Instruments
  • Point-of-Load Power Supply
LTC3601
1.5A, 15V Monolithic Synchronous Step-Down Regulator
Effi ciency and Power Loss vs Load Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

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

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3601

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC3601
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
DC1454A

LTC3601EMSE Demo Board (MSOP) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A

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Product Details

Demonstration circuit 1353 is a step-down converter, using the LTC3601 monolithic synchronous buck regulator in the 16-lead MSOP exposed pad package. The DC1353A has a maximum input voltage 15V, and is capable of delivering up to 1.5A of output current at a minimum input voltage of 4V. The output voltage of the DC1353A can be set as low as 0.6V, the reference voltage of the LTC3601. At low load currents, the DC1353A operates in discontinuous mode, and during shutdown, it consumes less than 40 uA of quiescent current.

eval board
schematic 2
DC1353A

LTC3601EUD Demo Board (QFN) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A

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Product Details

Demonstration circuit 1353 is a step-down converter, using the LTC3601 monolithic synchronous buck regulator in the 3mm x 3mm QFN-16 package. The DC1353A has a maximum input voltage 15V, and is capable of delivering up to 1.5A of output current at a minimum input voltage of 4V. The output voltage of the DC1353A can be set as low as 0.6V, the reference voltage of the LTC3601. At low load currents, the DC1353A operates in discontinuous mode, and during shutdown, it consumes less than 40 uA of quiescent current.
DC1454A
LTC3601EMSE Demo Board (MSOP) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A
DC1454A - Schematic
DC1353A
LTC3601EUD Demo Board (QFN) | 4V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 1.5A
DC1353A - Schematic

Latest Discussions

6 Years Ago
LTC3601 switching reg issue
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