LTC3307A

5V, 3A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN

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Recommended for New Designs

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New Content (1)

User Guide

DC3122A - Demo Manual

Overview

Features and Benefits
Product Details

Features and Benefits

Pin Compatible with LTC3308(4A) and LTC3309(6A)
High Efficiency: 8mΩ NMOS, 31mΩ PMOS
Programmable Frequency 1MHz to 3MHz

Tiny Inductor and Capacitors

Peak Current Mode Control

22ns Minimum On-Time
Wide Bandwidth, Fast Transient Response

Silent Switcher^® Architecture

Ultralow EMI Emissions

Low Ripple Burst Mode^® Operation with I_Q of 40µA
Safely Tolerates Inductor Saturation in Overload
V_IN Range: 2.25V to 5.5V
V_OUT Range: 0.5V to V_IN
V_OUT Accuracy: ±1% Over Temperature Range
Precision 400mV Enable Threshold, 1µA in Shutdown
Power Good, Internal Compensation and Soft Start
Thermally Enhanced 12-Lead 2mm × 2mm LQFN and 16-Pin 1.64mm × 1.64mm WLCSP Packages
AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC3307A is a very small, high efficiency, low noise, monolithic synchronous 3A step-down DC/DC converter operating from a 2.25V to 5.5V input supply. Using constant frequency, peak current mode control at switching frequencies 1MHz to 3MHz and minimum on-time as low as 22ns, this regulator achieves fast transient response with small external components. Silent Switcher architecture minimizes EMI emissions.

The LTC3307A operates in forced continuous or pulse skip mode for low noise, or low-ripple Burst Mode operation for high efficiency at light loads, ideal for battery-powered systems. The IC regulates output voltages as low as 500mV. Other features include output overvoltage protection, short-circuit protection, thermal shutdown, clock synchronization, and up to 100% duty cycle operation for low dropout. The device is available in a low profile 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed pad for low thermal resistance, and a 16-pin 1.64mm × 1.64mm × 0.5mm WLCSP package.

APPLICATIONS

Optical Networking, Servers, Telecom
Automotive, Industrial, Communications
Distributed DC Power Systems (POL)
FPGA, ASIC, µP Core Supplies
Battery Operated Systems

Product Categories

Power Management

Markets and Technologies

Healthcare (3)

Comparable Parts Click to see all in Parametric Search

Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

DC3122A

LTC3307A 3.3V to 1.2V at 3A, 2MHz Low EMI Buck Regulator in a 47mm² Solution

DC2990A

LTC3307A | 5V Input to 1.2V Output at 3A Synchronous Step‑Down Silent Switcher Demo Circuit

DC3122A

View Detailed Evaluation Kit Information

Demonstration circuit 3122A features the LTC®3307A 5V, 3A synchronous step-down Silent Switcher® operating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The LTC3307A supports adjustable output voltages from 0.5V to V_IN with operating frequencies from 1MHz up to 3MHz. The LTC3307A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. A minimum on-time of 22ns enables high V_IN to low V_OUT conversion ratios at high frequencies.

The DC3122A operating mode may be selected as Burst, Skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3307A to sync to a clock frequency from 1MHz to 3MHz. The LTC3307A operates in forced continuous mode when syncing to an external clock. The DC3122A is set to a fixed 2MHz frequency by connecting RT to V_IN through a 0Ω resistor, R9. The frequency can be easily changed by removing R9 and setting an appropriate resistor in the R4 location to obtain the desired frequency. Refer to the LTC3307A data sheet for the proper RT value for a desired switching frequency.

The DC3122A also has an Electromagnetic interference (EMI) filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the V_IN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests.

The LTC3307A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3307A is assembled in a 1.6mm × 1.6mm Wafer Level Chip Scale Package (WLCSP) with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI Printed Circuit Board (PCB) Layout.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode^® operation.

Resources

DC2990A

View Detailed Evaluation Kit Information

Demonstration circuit 2990A features the LTC3307A 5V, 3A synchronous step-down Silent Switcher^® operating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The LTC3307A supports adjustable output voltages from 0.5V to V_IN with operating frequencies from 1MHz up to 3MHz. The LTC3307A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. A minimum on-time of 22ns enables high V_IN to low V_OUT conversion ratios at high frequencies.

The DC2990A operating mode may be selected as Burst, Skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3307A to sync to a clock frequency from 1MHz to 3MHz. The LTC3307A operates in forced continuous mode when syncing to an external clock. The DC2990A is set to a fixed 2MHz frequency by connecting RT to V_IN through a 0Ω resistor, R9. The frequency can be easily changed by removing R9 and setting an appropriate resistor in the R4 location to obtain the desired frequency. Refer to the LTC3307A data sheet for the proper RT value for a desired switching frequency.

The DC2990A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the V_IN EMI terminal. The EMI performance of the board is shown in the EMI Test Results section. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests.

The LTC3307A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3307A is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout.

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

Resources

Documentation & Resources

Data Sheet

LTC3307A: 5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN Data Sheet (Rev. C)
1/18/2021
PDF

Reliability Data

R523 Reliability Data
4/13/2020
PDF

User Guide

DC3122A - Demo Manual (Rev. 0)
11/7/2023
PDF
DC2990A - Demo Manual
2/3/2020
PDF

Webcast

Improving Switch-Mode Power Supplies Using Noise Cancelling Technology
2/8/2023

Book & eBook

Understanding Silent Switcher Technology: High Efficiency, Low EMI eBook
7/14/2023
PDF

Solutions Bulletin & Brochure

Silent Switcher Technology
8/15/2023
PDF

Technical Article

Power Supply Miniaturization
4/25/2022
High Power Density in a Small Form Factor
10/1/2019 Analog Dialogue

Rarely Asked Question

Point-of-Load DC-to-DC Converters Solve Voltage Accuracy, Efficiency, and Latency Issues
7/1/2021

Tools & Simulations

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.

LTspice downloads and documentation

Models for the following parts are available in LTspice:

LTC3307A

LTC3307B

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.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

LTpowerCAD Project Files

LTC3307A Project - 3-5Vin to 1.2V/3A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LTC3307A

LTC3307B

Reference Designs (2)

Knightrider Zynq Ultrascale+ MPSOC

Automotive ASIL-D Compliant Power Delivery Board

Artix UltraScale+

Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified Design

Knightrider Zynq Ultrascale+ MPSOC

Automotive ASIL-D Compliant Power Delivery Board

Knightrider Zynq Ultrascale+ MPSOC

Automotive ASIL-D Compliant Power Delivery Board

View Detailed Reference Design Information

Features & Benefits

Xilinx Zynq^® UltraScale+™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.

Analog Devices, Inc. supports ASIL-D compliant automotive power delivery solutions for the Xilinx Zynq UltraScale+ MPSOC. The Knightrider board demonstrates the best-in-class power management supporting ASIL-D compliant solutions for functional safety.

Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and foot print.

ADI provides supporting documentation including power schematics, layout, LTpowerPlanner^® and applicable LTpowerPlay^® configuration files to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Key Power for full management devices are used as follows:

LT8672
LTC4365
MAX20410
MAX20478
MAX20438
LTC3307
MAX25229
MAX17510

Parts Used

Artix UltraScale+

Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified Design

Artix UltraScale+

Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified Design

View Detailed Reference Design Information

Features & Benefits

Xilinx Artix^® UltraScale+^™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.

Analog Devices, Inc. supports power delivery solutions for the Artix Ultrascale+ low-cost designs. Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and footprint.

ADI provides supporting documentation including power schematics, layout, LTpowerPlanner^® and applicable LTpowerPlay^® configuration files to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Key Power for full management devices are used as follows:

LTC3307A
LTC3309A
ADP125
LTC3617 (Optional DDR)
LTC3618
ADM1186 (Optional Monitoring & Sequencing)

Parts Used

Design Resources

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.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LTC3307AACBZ-R7	Material Declaration	Reliability Data	CHIPS W/SOLDER BUMPS/WLCSP	Ultra Librarian SamacSys
LTC3307AEV#TRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AEV#TRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AEV#WTRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AEV#WTRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AHV#TRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AHV#TRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AHV#WTRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AHV#WTRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AIV#TRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AIV#TRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AIV#WTRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AIV#WTRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AJV#TRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AJV#TRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AJV#WTRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AJV#WTRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AMPV#TRMPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
LTC3307AMPV#TRPBF	Material Declaration	Reliability Data	12-Lead LQFN (2mm x 2mm x 0.74mm)	Ultra Librarian SamacSys
Wafer Fabrication Data		R523 Reliability Data

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Support & Discussions

LTC3307A Discussions

RE: Strike LTC3307A with a voltage > 6V

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