LTC3313

5V, 15A Synchronous Step-Down Silent Switcher in 3mm × 3mm LQFN

Buy Now

Recommended for New Designs

Top

New Content (1)

User Guides

UG-2077: Evaluating the LTC3313 5 V, 15 A Synchronous Step-Down Silent Switcher in 3 mm × 3 mm LQFN

Overview

Features and Benefits
Product Details

Features and Benefits

Layout Compatible with LTC3310/LTC3311 Family
Silent Switcher^® Architecture
- Ultralow EMI Emissions
High Efficiency: 3mΩ NMOS and 8mΩ PMOS
Wide Bandwidth, Fast Transient Response
Safely Tolerates Inductor Saturation in Overload
V_IN Range: 2.25V to 5.5V
V_OUT Range: 0.5V to VIN
V_OUT Accuracy: ±1% with Remote Sense
Peak Current Mode Control

Minimum On-Time: 35ns
Programmable Frequency to 5MHz
Shutdown Current: 1μA
Precision 400mV Enable Threshold
Output Soft-Start with Voltage Tracking
Power Good Output
Die Temperature Monitor
Configurable for Paralleling Power Stages
Thermally-Enhanced 3mm × 3mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC3313 is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 15A of output current from a 2.25V to 5.5V input supply. The device employs the Silent Switcher architecture to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multiphasing parallel converters is readily implemented.

The LTC3313 uses a constant frequency, peak current mode control architecture for fast transient response. A 500mV reference allows for low voltage outputs. 100% duty cycle operation delivers low drop out.

Other features include a power good signal when the output is in regulation, a precision enable threshold, output overvoltage protection, thermal shutdown, a temperature monitor, clock synchronization, mode selection, and output short circuit protection. The device is available in a compact 18-pin 3mm × 3mm LQFN package.

APPLICATIONS

Automotive/Industrial/Communications
Servers, Telecom Power Supplies
Distributed DC Power Systems (POL)
FPGA, ASIC, μP Core Supplies

Product Categories

Power Management
- Internal Power Switch Buck Regulators

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 (1)

EVAL-LTC3313

LTC3313 5 V, 15 A Synchronous Step-Down Silent Switcher in 3 mm × 3 mm LQFN

EVAL-LTC3313

View Detailed Evaluation Kit Information

The EVAL-LTC3313EV-A-Z features the LTC3313, 15 A low voltage synchronous step-down Silent Switcher^® that operates as a 2 MHz, 2.25 V to 5.5 V input, 1.2 V, 15 A output buck regulator. The LTC3313 supports an output voltage (V_OUT) from 0.5 V to the input voltage (V_IN) with operating frequencies from 500 kHz up to 5 MHz. The LTC3313 is a compact, ultralow emission, high-efficiency, and high speed synchronous monolithic step-down switching regulator. The Silent Switcher technology optimizes fast-current loops and makes it easier to minimize electromagnetic interference (EMI) and electromagnetic compatibility (EMC) emissions. The minimum on-time of 35 ns typical enables high V_IN to low V_OUT conversion at a high frequency.

The EVAL-LTC3313EV-A-Z runs in forced continuous mode with a 2 MHz switching frequency (f_SW); however, it can be configured to run at different switching frequencies or in pulse-skipping mode. The LTC3313 oscillator can also synchronize to an external clock using a MODE/SYNC turret, with the EVAL-LTC3313EV-A-Z default setup. Figure 4 in the user guide shows the efficiency and power loss of the EVALLTC3313EV-A-Z with a 3.3 V input in both operation modes.

The EVAL-LTC3313EV-A-Z 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-EVAL-LTC3313EV-A-Z is shown in the EMI Test Results section of the user guide. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests. The LTC3313 data sheet gives a complete description of the device and its application information. The data sheet must be read in conjunction with the evaluation board user guide. The LTC3313 is assembled in a 3 mm × 3 mm LQFN package with an exposed pad for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the LTC3313 data sheet.

Features & Benefits

EVAL-LTC3313EV-A-Z evaluation board
Transient circuit included for load transient evaluation
EMI filter included to reduce noise in EMI emission tests
MODE pin pull-up option for pulse-skipping mode evaluation

Resources

Documentation & Resources

Data Sheets

LTC3313: 5V, 15A Synchronous Step-Down Silent Switcher in 3mm × 3mm LQFN Data Sheet (Rev. 0)
1/18/2023

PDF

1 M

User Guides

UG-2077: Evaluating the LTC3313 5 V, 15 A Synchronous Step-Down Silent Switcher in 3 mm × 3 mm LQFN (Rev. 0)
1/24/2023

PDF

870 K

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:

LTC3313

LTC3313-0.75

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.

LTpowerCAD download and documentation

Design tools for the following parts are available in LTpowerCAD:

LTC3313

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.

Quality And Reliability

Symbols and Footprints

Request Product/Process Change Notifications

Save to myAnalog

Support & Discussions

LTC3313 Discussions

When is a snubber needed on a buck regulator?

2 week(s) ago in Power Management

All LTC3313 Discussions

Contact ADI Technical Support »

Ask your question »

Contact ADI Technical Support »

Ask your question »

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.

Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.

List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Sampling

Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help

Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.