LTC3612

PRODUCTION

3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter

Data Sheet (Rev. D) Product Selection Table
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Overview

  • 3A Output Current
  • 2.25V to 5.5V Input Voltage Range
  • Low Output Ripple Burst Mode® Operation: IQ = 70μA
  • ±1% Output Voltage Accuracy
  • Output Voltage Down to 0.6V
  • High Efficiency: Up to 95%
  • Low Dropout Operation: 100% Duty Cycle
  • Shutdown Current: ≤1μA
  • Adjustable Switching Frequency: Up to 4MHz
  • Programmable Soft-Start
  • Optional Active Voltage Positioning (AVP) with Internal Compensation
  • Selectable Pulse-Skipping/Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp
  • Inputs for Start-Up Tracking or External Reference
  • DDR Memory Mode, IOUT = ±1.5A
  • Available in Thermally Enhanced 20-Pin (3mm × 4mm) QFN and TSSOP Packages
  • AEC-Q100 Qualified for Automotive Applications

The LTC3612 is a low quiescent current monolithic synchronous buck regulator using a current mode, constant frequency architecture. The no-load DC supply current in sleep mode is only 70μA while maintaining the output voltage (Burst Mode operation) at no load, dropping to zero current in shutdown. The 2.25V to 5.5V input supply voltage range makes the LTC3612 ideally suited for single Li-Ion as well as fixed low voltage input applications. 100% duty cycle capability provides low dropout operation, extending the operating time in battery-powered systems.

The operating frequency is externally programmable up to 4MHz, allowing the use of small surface mount inductors. For switching noise-sensitive applications, the LTC3612 can be synchronized to an external clock at up to 4MHz.

Forced continuous mode operation in the LTC3612 reduces noise and RF interference. Adjustable compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The internal synchronous switch increases efficiency and eliminates the need for an external catch diode, saving external components and board space. The LTC3612 is offered in a leadless 20-pin 3mm × 4mm QFN or a thermally enhanced 20-pin TSSOP package.

APPLICATIONS

  • Point-of-Load Supplies
  • Distributed Power Supplies
  • Portable Computer Systems
  • DDR Memory Termination
  • Handheld Devices
LTC3612
3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter
LTC3612 Application Circuit LTC3612 Pin Configuration LTC3612 Pin Configuration LTC3612 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
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:

  • LTC3612

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC3612
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
DC1310A

LTC3612EUDC Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, QFN-20 Pkg

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Product Details

Demo Circuit 1310 is a high efficiency, high frequency step-down converter, incorporating the LTC3612 monolithic synchronous regulator. The DC1310A has an input voltage range of 2.25V to 5.5V, and is capable of delivering up to 3A of output current. The output voltage of the DC1310A can be set as low as 0.6V, the reference voltage of the LTC3612. The operating frequency range of the DC1310A is either set to a fixed 2.25 MHz by connecting the frequency pin to SVin, set by an external resistor, or synchronized to an external clock, with a range up to 4 MHz. At low load currents, the DC1310A can operate in either noise sensitive applications, due to the capability of the LTC3612 to operate in pulse-skipping mode, or in high efficiency applications, because the LTC3612 also has Burst-Mode capability.

 

eval board
schematic 2
DC1574A

LTC3612EFE Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, TSSOP-16E Pkg

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Product Details

Demo Circuit 1574 is a high efficiency, high frequency step-down converter, incorporating the LTC3612 monolithic synchronous regulator. The DC1574A has an input voltage range of 2.25V to 5.5V, and is capable of delivering up to 3A of output current. The output voltage of the DC1574A can be set as low as 0.6V, the reference voltage of the LTC3612. The operating frequency range of the DC1574A is either set to a fixed 2.25 MHz by connecting the frequency pin to SVIN, set by an external resistor, or synchronized to an external clock, with a range up to 4 MHz. At low load currents, the DC1574A can operate in either noise sensitive applications, due to the capability of the LTC3612 to operate in pulse-skipping mode, or in high efficiency applications, because the LTC3612 also has Burst-Mode capability. The Burst Mode clamp can be set externally.
DC1310A
LTC3612EUDC Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, QFN-20 Pkg
DC1310A - Schematic
DC1574A
LTC3612EFE Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, TSSOP-16E Pkg
DC1574A - Schematic

Reference Designs

MAX 10 NEEK Dev Kit
MAX 10 NEEK Dev Kit
MAX 10 NEEK Block Diagram
MAX 10 NEEK Power Tree
MAX 10 NEEK Development Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
DE0 Nano SoC Dev Platform - Top View
DE0 Nano SoC Dev Platform - Top View
DE0 Nano SoC Dev Platform - Bottom View
DE0 Nano SoC Block Diagram
DE0 Nano SoC Power Tree
Terasic DE0-Nano-SoC Kit / Atlas-SoC Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
DE-10 Nano Kit
DE-10 Nano Kit
DE-10 Nano Kit Block Diagram
DE-10 Nano Power Tree
Terasic DE10-Nano Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Stratix V Advanced System Development Board
Stratix V Advanced System Development Board
Stratix V Advanced System Development Board Block Diagram
Stratix V Advanced Systems Development Board Power Tree
Stratix V Advanced System Development Board Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
MAX 10 NEEK Development Kit
MAX 10 NEEK Dev Kit
MAX 10 NEEK Block Diagram
MAX 10 NEEK Power Tree
Terasic DE0-Nano-SoC Kit / Atlas-SoC Kit
DE0 Nano SoC Dev Platform - Top View
DE0 Nano SoC Dev Platform - Bottom View
DE0 Nano SoC Block Diagram
DE0 Nano SoC Power Tree
Terasic DE10-Nano Kit
DE-10 Nano Kit
DE-10 Nano Kit Block Diagram
DE-10 Nano Power Tree
Stratix V Advanced System Development Board
Stratix V Advanced System Development Board
Stratix V Advanced System Development Board Block Diagram
Stratix V Advanced Systems Development Board Power Tree

Latest Discussions

2 Years Ago
LTC3612 Run pin input impedance (current draw)
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