LTC3309A

Name: LTC3309A
Brand: Analog Devices
Price: 2.84 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

5V, 6A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN

Data Sheet (Rev. B) Product Selection Table

Part Models: 22
1ku List Price: Starting From $2.84

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Overview

Pin Compatible with LTC3307(3A) and LTC3308(4A)
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 2mm × 2mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

Part Models: 22
1ku List Price: Starting From $2.84

Documentation

Data Sheet 1

LTC3309A: 5V, 6A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN Data Sheet (Rev.B) 04/19/2019

Technical Articles 2

Voltage Input-to-Output Control for Linear Regulators—Part 1: Quick Start and Benefits 12/08/2025

What’s in Your Healthcare Monitor? 04/01/2020

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3309AEV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AEV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AEV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AEV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AHV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AHV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AHV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AHV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AIV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AIV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AIV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AIV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV-7#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV-7#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV-7#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AJV-7#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AMPV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3309AMPV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3309A
LTC3309B

LTpowerCAD 1

LTC3309A Project - DC2745A 3-5Vin to 1.2V/6A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LTC3309A
LTC3309B

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^® 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

LTC3309A | 5V, 6A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN

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Product Details

Demonstration Circuit 2745A features the LTC3309A 5V, 6A synchronous step-down silent switcher operating as a 2MHz 3.3V to 1.2V 6A buck regulator. The LTC3309A supports adjustable output voltages from 0.5V to V_IN, operating frequencies from 1MHz up to 3MHz. The LTC3309A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 22ns enables high V_IN to low V_OUT conversion at high frequency.

DC2745A operating mode may be selected as Burst Mode^® operation, skip or forced continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3309A to sync to a clock frequency from 1MHz to 3MHz. The LTC3309A operates in forced continuous mode when syncing to an external clock. RT is connected to VIN through a 0Ω resistor, R9, which sets the operating frequency to 2MHz. 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 LTC3309A data sheet for the proper RT value.

The DC2745A also has an EMI filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the VIN 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 LTC3309A data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo. The LTC3309A is assembled in a 3mm × 3mm 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. The LTC3309A is available in a 12-lead 2mm × 2mm LGA package.

Resources

DC2745A - Design Files
1/29/2020

DC2745A - Schematic
1/29/2020

DC2745A - Demo Manual (Rev.0)
1/29/2020

LTC3309A | 5V, 6A Synchronous Step-Down Silent Switcher in 2mm × 2mm LQFN

Buy Now View Details

Product Details

The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation. The LTC3309A is available in a 12-lead 2mm × 2mm LGA package.

Resources

DC2745A - Design Files
1/29/2020

DC2745A - Schematic
1/29/2020

DC2745A - Demo Manual (Rev.0)
1/29/2020

Reference Designs

Galvanically Isolated Full HD 1080p/60Hz HDMI PHY Using iCoupler Isolation Technology

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Features and Benefits

Circuit Evaluation Boards
- CN-0571 Circuit Evaluation Board (EVAL-CN0571-EBZ)
Design and Integration Files
- Schematics, Layout Files, Bill of Materials

Part Used

Design & Integration Tools

CN0571 Design and Integration Files
5.11 M

Artix US+ Rail Consolidation – Minimum Rails (AU10P/15P) Power Tree

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

View Detailed Reference Design

Features and 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.