LTC3310S
LTC3310S-1
LTC3310
LTC3310-1

5V, 10A Synchronous Step-Down Silent Switcher 2 in 3mm × 3mm LQFN

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Recommended for New Designs

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Overview

Features and Benefits
Product Details

Features and Benefits

Silent Switcher^®2 Architecture: Ultralow EMI Emissions (LTC3310S and LTC3310S-1)
High Efficiency: 4.5mΩ NMOS and 16mΩ 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 V_IN
V_OUT Accuracy: ±1% with Remote Sense
Peak Current Mode Control
35ns Minimum On-Time

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 LTC3310S is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 10A of output current from a 2.25V to 5.5V input supply. The device employs Silent Switcher 2 architecture with internal hot loop bypass capacitors to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. For systems with higher power requirements, multi-phasing parallel converters is readily implemented.

The LTC3310S 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, precision enable threshold, output overvoltage protection, thermal shutdown, a temperature monitor, clock synchronization, mode selection and output short circuit protection.

Part Number	Silent Switcher	V_OUT
LTC3310S	SS2	Adjustable
LTC3310S-1	SS2	Fixed 1V
LTC3310	SS1	Adjustable
LTC3310-1	SS1	Fixed 1V

APPLICATIONS

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

Product Categories

Power Management
- Ultralow Noise Regulators
- Internal Power Switch Buck Regulators

Markets and Technologies

Aerospace and Defense (1)
- Avionics Products and Solutions

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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 (5)

DC3021A

LTC3310S-1 | 3.3V to 1.0V at 10A, 2MHz Low EMI Buck Regulator in a 2.11cm² Solution

DC3042A

LTC3310 Demo Board | 3.3V to 1.2V@10A, 2MHz Automotive Low EMI Buck in a 1.17cm2 Solution

DC2874A

LTC3310S Demo Board | 5V, Multiphase Low Voltage, Synchronous Step-Down Silent Switcher 2 in 3x3 LQFN

DC3043A

LTC3310-1 Demo Board | 3.3V to 1.0V at 10A, 2MHz Automotive Low EMI Buck Regulator in a 2.11cm² Solution

DC2629A

LTC3310S: 5V, 10A Synchronous Step Down Silent Switcher in 3mm x3mm LQFN

DC3021A

View Detailed Evaluation Kit Information

Demonstration circuit 3021A shows the LTC3310S-1 10A, 1V fixed output, synchronous step-down Silent Switcher^®2 operating as a 2MHz 3.3V to 1.0V 10A buck regulator. The LTC3310S-1 supports operating frequencies from 500kHz up to 5MHz. The LTC3310S-1 is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast-current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. The LTC3310S-1 has Active Voltage Positioning (AVP) where the output voltage is dependent on load current. At light loads, the output voltage is regulated above the nominal value. At full load, the output voltage is regulated below the nominal value. The DC load regulation is adjusted to improve transient performance and reduce output capacitor requirements.

DC3021A is set up to run in forced continuous mode with a 2MHz switching frequency but can be configured to pulse-skipping mode and different switching frequencies. RT is connected to V_IN which sets the MODE/SYNC pin as an input and allows the LTC3310S-1 to sync from an external clock. Connecting the MODE/SYNC pin to V_IN sets the mode to pulse-skipping mode and connecting the MODE/SYNC pin to GND sets the mode to forced continuous mode.

The DC3021A 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 of the demo manual. The red lines in the EMI performance graphs illustrate the CISPR25 Class 5 peak limits for the conducted and radiated emission tests.

The LTC3310S/LTC3310S-1 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the DC3021A demo manual. The LTC3310S-1 is assembled in a 3mm × 3mm LQFN package with exposed pad 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.

Resources

DC3042A

View Detailed Evaluation Kit Information

Demonstration circuit 3042A features the LTC3310, 10A, Low Voltage Synchronous Step-Down Silent Switcher^® operating as a 2MHz, 2.25V to 5.5V input, 1.2V/10A output buck regulator. The LTC3310 supports output voltages from 0.5V to V_IN with operating frequencies from 500kHz up to 5MHz. The LTC3310 is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The Silent Switcher technology optimizes the fast-current loops and makes it easier to minimize EMI/EMC emissions. Fast minimum on-time of 35ns enables high V_IN to low V_OUT conversion at high frequency.

DC3042A is set up to run in forced continuous mode with a 2MHz switching frequency but can be configured to pulse-skipping mode and different switching frequencies. connecting RT to V_IN sets the MODE/SYNC pin as an input and allows the LTC3310 to sync from an external clock. Connecting the MODE/SYNC pin to V_IN sets the mode to forced continuous mode and connecting the MODE/SYNC pin to GND sets the mode to pulse-skipping mode. The Efficiency vs Load graph shows the efficiency and power loss of the circuit with a 3.3V input in forced continuous mode operation.

The DC3042A 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 LTC3310 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 LTC3310 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 Low EMI PCB Layout section.

Resources

DC2874A

View Detailed Evaluation Kit Information

Demonstration Circuit DC2874A shows the LTC3310S 10A, Low Voltage, Synchronous Step-Down Silent Switcher operating as a multiphase 2.0MHz 3.3V to 1.2V buck regulator. The DC2874A has three build options to provide a two phase 20A, three phase 30A, or four phase 40A output solution. The LTC3310S supports adjustable output voltages from 0.5V to V_IN and operating frequencies from 500kHz up to 2.25MHz in multiphase operation.

DC2874A operates in pulse skip mode and allows the slave phases to stop switching first before the master starts skipping pulses for better low current efficiency.

The DC2874A 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 Efficiency vs. Load graph shows the efficiency of the circuit with a 3.3V input for the 2-, 3-, 4-phase circuits.

The LTC3310S datasheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. The LTC3310S is assembled in a 3mm x 3mm LQFN package with exposed pads for low thermal resistance.

Resources

DC3043A

View Detailed Evaluation Kit Information

Demonstration Circuit 3043A shows the LTC3310-1 10A, 1V fixed output, synchronous step-down Silent Switcher^® operating as a 2MHz 3.3V to 1.0V 10A buck regulator. The LTC3310-1 supports operating frequencies from 500kHz up to 5MHz. The LTC3310-1 is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The LTC3310-1 has Active Voltage Positioning (AVP) where the output voltage is dependent on load current. At light loads the output voltage is regulated above the nominal value. At full load the output voltage is regulated below the nominal value. The DC load regulation is adjusted to improve transient performance and reduce output capacitor requirements.

DC3043A is set up to run in forced continuous mode with a 2MHz switching frequency but can be configured to pulse skip mode and different switching frequencies. RT is connected to V_IN which sets the MODE/SYNC pin as an input and allows the LTC3310-1 to sync from an external clock. Connecting the MODE/SYNC pin to V_IN sets the mode to pulse skip mode and connecting the MODE/SYNC pin to GND sets the mode to forced continuous mode.

The DC3043A 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 LTC3310S/LTC3310-1 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the demo manual. The LTC3310-1 is assembled in a 3mm × 3mm LQFN package with exposed pad 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.

Resources

DC2629A

View Detailed Evaluation Kit Information

Demonstration Circuit DC2629A features the LTC3310S 10A, Low Voltage, Synchronous Step-Down Silent Switcher^® 2 operating as a 2MHz 3.3V to 1.2V 10A buck regulator. The LTC3310S supports output voltages from 0.5V to V_IN with operating frequencies from 500kHz up to 5MHz. The LTC3310S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Fast minimum on-time of 35ns enables high V_IN to low V_OUT conversion at high frequency.

DC2629A is set up to run in Forced Continuous Mode with a 2MHz switching frequency but can be configured to Pulse Skip Mode and different switching frequencies. RT is connected to V_IN which sets the MODE/SYNC pin as an input and allows the LTC3310S to sync from an external clock. Connecting the MODE/SYNC pin to V_IN sets the mode to Forced Continuous Mode and connecting the MODE/SYNC pin to GND sets the mode to Pulse Skip Mode. The Efficiency vs. Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in forced continuous mode operation.

The DC2629A 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 LTC3310S 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 LTC3310S is assembled in a 3mm x 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.

Resources

Documentation & Resources

Data Sheets

LTC3310S/LTC3310S-1/LTC3310/LTC3310-1: 5V, 10A Synchronous Step-Down Silent Switcher 2 in 3mm × 3mm LQFN Data Sheet (Rev. F)
10/25/2018

PDF

2 M

User Guides

DC3043A - Demo Manual (Rev. 0)
4/30/2021

PDF

1 M
DC2874A - Demo Manual
12/19/2019

PDF

794K
DC2629A - Demo Manual (Rev. 0)
4/5/2019

PDF

886 K

Demo Board Schematic

DC2629A - Schematic
4/10/2019

PDF

113 K

Videos

LTC33XX, 5V Family of Synchronous Step-Down Silent Switchers
5/24/2021

Press Releases

Compact 5V, 10A Synchronous Silent Switcher 2 Buck Regulator Reduces Heat, EMI & Footprint in High Power Density Applications
4/21/2022

Technical Articles

Power Supply Design: How Bode Plots Can Help You Meet the Requirements for Dynamic Control Behavior
7/1/2021
How the Smart Hardware Engineer Can Easily Design Power Supplies: Mini Tutorial
6/1/2021
Improving Power Supply Design Using Semi-Automation—Five Steps to Quick and Efficient Design
2/5/2021 Analog Dialogue
Fiber Optic Systems Get Thermal Enhancements
10/1/2019
High Power Density in a Small Form Factor
10/1/2019 Analog Dialogue

Rarely Asked Questions

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:

LTC3310

LTC3310-1

LTC3310S

LTC3310S-1

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

LTC3310S Project - DC2629A 3-5Vin to 1.2V/10A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LTC3310

LTC3310S

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
LTC3310HV#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310HV-1#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV-1#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV-1#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310JV-1#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SEV-1#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#PBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#TRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#TRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#WPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#WTRMPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
LTC3310SIV-1#WTRPBF	Material Declaration	Reliability Data	18-Lead LQFN (3mm × 3mm × 0.94mm)	Ultra Librarian SamacSys
Wafer Fabrication Data

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