LTC3604

PRODUCTION

2.5A, 15V Monolithic Synchronous Step-Down Regulator

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Overview

  • 3.6V to 15V Operating Input Voltage Range
  • 2.5A Output Current
  • Up to 95% 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 Low Ripple (20mVP-P Typical) Burst Mode® (No Load IQ = 300μA) or Forced Continuous Operation
  • 0.6V Reference Allows Low Output Voltages
  • Short-Circuit Protected
  • Output Voltage Tracking Capability
  • Power Good Status Output
  • Available in Small, Thermally-Enhanced, 16-Pin QFN (3mm × 3mm) and MSOP Packages

The LTC3604 is a high efficiency, monolithic synchronous buck regulator using a phase-lockable controlled on-time, current mode architecture capable of supplying up to 2.5A of output current. The operating supply voltage range is from 3.6V 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 LTC3604 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 LTC3604 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 Supplies
LTC3604
2.5A, 15V Monolithic Synchronous Step-Down Regulator
High Efficiency 2.5A Step-Down Regulator Efficiency 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

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
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:

  • LTC3604

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC3604
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
DC1611A

LTC3604EMSE Demo Board | (MSOP) 3.6V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 2.5A

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Product Details

Demonstration circuit 1611 is a step-down converter, using the LTC3604 monolithic synchronous buck regulator in the exposed pad MSOP-16 package. The DC1611 has a maximum input voltage 15V, and is capable of delivering up to 2.5A of output current at a minimum input voltage of 3.6V. The output voltage of the DC1611 can be set as low as 0.6V, the reference voltage of the LTC3604.

eval board
schematic 2
DC1610A

LTC3604EUD Demo Board | (QFN) 3.6V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 2.5A

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Product Details

Demonstration circuit 1610 is a step-down converter, using the LTC3604 monolithic synchronous buck regulator in the 3 × 3 QFN-16 package. The DC1610A has a maximum input voltage 15V, and is capable of delivering up to 2.5A of output current at a minimum input voltage of 3.6V. The output voltage of the DC1610A can be set as low as 0.6V, the reference voltage of the LTC3604.
DC1611A
LTC3604EMSE Demo Board | (MSOP) 3.6V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 2.5A
DC1611A - Schematic
DC1610A
LTC3604EUD Demo Board | (QFN) 3.6V ≤ VIN ≤ 15V, VOUT = 1.2V/1.8V/3.3V @ 2.5A
DC1610A - Schematic

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