LTC3309A
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LTC3309A

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

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 22
1ku List Price Starting From $2.24
Features
  • 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 IQ of 40µA
  • Safely Tolerates Inductor Saturation in Overload
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN 
  • VOUT 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
Additional Details
show more Icon

The LTC3309A is a very small, high efficiency, low noise, monolithic synchronous 6A 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 LTC3309A operates in forced continuous or pulse skip mode for low noise, or the 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.

For applications that require a faster power on, the LTC3309A-7 has a reduced power on and soft-start time.

APPLICATIONS

  • Optical Networking, Servers, Telecom
  • Automotive, Industrial, Communications
  • Distributed DC Power Systems (POL)
  • FPGA, ASIC, µP Core Supplies
  • Battery Operated Systems
Part Models 22
1ku List Price Starting From $2.24

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3309AEV#TRMPBF
  • HTML
  • HTML
LTC3309AEV#TRPBF
  • HTML
  • HTML
LTC3309AEV#WTRMPBF
  • HTML
  • HTML
LTC3309AEV#WTRPBF
  • HTML
  • HTML
LTC3309AHV#TRMPBF
  • HTML
  • HTML
LTC3309AHV#TRPBF
  • HTML
  • HTML
LTC3309AHV#WTRMPBF
  • HTML
  • HTML
LTC3309AHV#WTRPBF
  • HTML
  • HTML
LTC3309AIV#TRMPBF
  • HTML
  • HTML
LTC3309AIV#TRPBF
  • HTML
  • HTML
LTC3309AIV#WTRMPBF
  • HTML
  • HTML
LTC3309AIV#WTRPBF
  • HTML
  • HTML
LTC3309AJV#TRMPBF
  • HTML
  • HTML
LTC3309AJV#TRPBF
  • HTML
  • HTML
LTC3309AJV#WTRMPBF
  • HTML
  • HTML
LTC3309AJV#WTRPBF
  • HTML
  • HTML
LTC3309AJV-7#TRMPBF
  • HTML
  • HTML
LTC3309AJV-7#TRPBF
  • HTML
  • HTML
LTC3309AJV-7#WTRMPBF
  • HTML
  • HTML
LTC3309AJV-7#WTRPBF
  • HTML
  • HTML
LTC3309AMPV#TRMPBF
  • HTML
  • HTML
LTC3309AMPV#TRPBF
  • HTML
  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2745A

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

zoom

DC2745A

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

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

Product Detail

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 VIN, 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 VIN to low VOUT 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.

Tools & Simulations

Tools & Simulations 2

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.

Reference Designs

Reference Designs 1

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

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

zoomopens a dialog

artix-ultrascale

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

artix-ultrascale

Circuits from the lab

tooltip Info:Circuits from the lab
Minimum Rails for AU10/15P and AU20/25P - Non-Hardware Verified 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.

  • 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)
View Detailed Reference Design external link

Recently Viewed