LTC3612
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LTC3612

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

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LTspice LTC3612 Demo Circuit - 3A, 4MHz Synchronous Step-down Regulator (3.3V to 1.8V @ 3A) Download 2.00KB LTspice LTC3612 - Switching Regulators Download 1.48 KB
Part Models 22
1ku List Price Starting From $3.72
Features
  • 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
Additional Details
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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
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file View Data Sheet (Rev.D)
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LTspice LTC3612 Demo Circuit - 3A, 4MHz Synchronous Step-down Regulator (3.3V to 1.8V @ 3A) Download 2.00KB LTspice LTC3612 - Switching Regulators Download 1.48 KB
Part Models 22
1ku List Price Starting From $3.72
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UPDATED 11/07/2014
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LTC3612: 3A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter Data Sheet (Rev.D)

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UPDATED 12/17/2014
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LTC3612: 3A、4MHzモノリシック同期整流式降圧DC/DCコンバータ データシート

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Documentation

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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Evaluation Kit

Evaluation Kits 2

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DC1310A

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

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DC1310A

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

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DC1310A
LTC3612EUDC Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, QFN-20 Pkg
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Product Detail

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.

 

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DC1310A - Schematic Download

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DC1574A

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

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DC1574A

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

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DC1574A
LTC3612EFE Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, TSSOP-16E Pkg
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Product Detail

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.

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DC1574A - Schematic Download

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DC1574A - Demo Manual Download

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DC1574A - Design Files Download

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Evaluation Kits2

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DC1310A

LTC3612EUDC Demo Board | 3A, 4MHz, Monolithic Synchronous Step-Down Regulator, QFN-20 Pkg
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DC1574A

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

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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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3612 Demo Circuit - 3A, 4MHz Synchronous Step-down Regulator (3.3V to 1.8V @ 3A) Download

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LTC3612 - Switching Regulators Download

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Reference Designs

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  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
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Part Used 6

LTC2990 reference design link

LT1962 reference design link

LT3080 reference design link

LT3022 reference design link

LT3030 reference design link

LTC3612 reference design link

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  • 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
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Part Used 11

LT3009 reference design link

LTC3115-1 reference design link

LT3083 reference design link

LTC3615 reference design link

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  • 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
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Reference Designs4

DE0 Nano SoC Dev Platform - Top View

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