LTC7151S

20V, 15A Synchronous Step-Down Silent Switcher 2 Regulator

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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 for Low EMI
V_IN Range: 3.1V to 20V
V_OUT Range: 0.5V to 5.5V
Differential V_OUT Remote Sense
Adjustable Frequency: 400kHz to 3MHz
PolyPhase^® Operation: Up to 12 Phases
Output Tracking and Soft-Start

Reference Accuracy: ±1% Overtemperature
Current Mode Operation for Excellent Line and Load Transient Response
Accurate 1.2V Run Pin Threshold
Supports Forced Continuous/Discontinuous Modes
28-Lead Thermally Enhanced 4mm × 5mm × 0.74mm LQFN Package

Product Details

The LTC7151S is a high efficiency monolithic synchronous buck regulator capable of delivering 15A to the load. It uses a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC7151S regulators to run out-of-phase, which reduces the amount of input and output capacitors required. The operating supply voltage range is from 3.1V to 20V.

The operating frequency is programmable from 400kHz to 3MHz with an external resistor. The high frequency capability allows the use of physically smaller inductor and capacitor sizes. For switching noise sensitive applications, the LTC7151S can be externally synchronized from 400kHz to 3MHz. The PHMODE pin allows the user control of the phase of the outgoing clock signal. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The LTC7151S uses second generation Silent Switcher 2 technology including integrated bypass capacitors to deliver a highly efficient solution at high frequencies with excellent EMI performance.

Applications

Automotive and Industrial Power Supplies
Server Power Applications
Distributed Power Systems
Point-of-Load Supply for ASIC, FPGA, DSP, µP, etc.

Product Categories

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

Markets and Technologies

Data Center

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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 (1)

DC2615A

LTC7151S High Efficiency 15A Silent Switcher Buck Regulator

DC2615A

View Detailed Evaluation Kit Information

Demonstration circuit 2615A features the LTC7151S in a high efficiency 1.2V/15A step-down regulator with an input voltage range of 3.1V to 20V and a 1MHz switching frequency. The Silent Switcher^®2 technology reduces the switching noise while the internal MOSFETs of the LTC7151S provide high efficiency over a wide input voltage range. No current sense resistor is required.

The LTC7151S employs a controlled on-time, valley current mode architecture. This architecture allows for a short minimum on-time which is ideal for high stepdown ratios. In addition, the architecture provides a fast load step response by allowing the switch node pulses to compress after the load steps up – see Figure 6.

The LTC7151S data sheet provides a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide.

Features & Benefits

Selectable light load operating modes of continuous conduction mode (CCM) or discontinuous mode (DCM).
SYNC pin to synchronize the regulator to an external clock.
PGOOD pin and RUN pin

Resources

Documentation & Resources

Data Sheets

LTC7151S: 20V, 15A Synchronous Step-Down Silent Switcher 2 Regulator Data Sheet (Rev. 0)
10/23/2018

PDF

2 M

Reliability Data

R564 Reliability Data
3/23/2018

PDF

26 K

Technical Articles

Comprehensive Power Supply System Designs for Harsh Automotive Environments Consume Minimal Space, Preserve Battery Charge, Feature Low EMI
8/16/2019 Analog Dialogue

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice downloads and documentation

LTspice Simulations

LTC7151S Demo Circuit - High Efficiency Synchronous Buck Regulator (4-20V to 3.3V @ 15A)

LTC7151S Demo Circuit - High Efficiency 15A Silent Switcher Buck Regulator (3.1-20V to 1.2V @ 15A)

Models for the following parts are available in LTspice:

LTC7151S

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

LTC7151S Project - 3.1-20Vin to 1.2Vout, 5A, 1MHz

LTC7151S Project - 4-20Vin to 3.3V, 15A, 1MHz

Design tools for the following parts are available in LTpowerCAD:

LTC7151S

Reference Designs (3)

Versal HBM Non-Hardware Verified Design

Blaize Pathfinder

Pathfinder P1600 SOM Module

Versal Premium

Non-Hardware Verified Design

Versal HBM Non-Hardware Verified Design

View Detailed Reference Design Information

Features & Benefits

The Versal^™ HBM series features heterogeneous integration of fast memory, secure connectivity, and adaptive compute to eliminate processing and memory bottlenecks for memory-bound, compute-intensive workloads such as machine learning, database acceleration, next-generation firewalls, and advanced network testers. Analog Devices has worked closely AMD to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
ADI provides supporting documentation including 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 local FAE.
ADI has also completed a complete power evaluation report for Mid-High Voltage rails. For a complete report please submit your interest here.

Key power regulators are used for this device as follows:

LTC3888-1
LTC7051
LTC3633A
LTC7200S
LTC7151S
LT8652
ADP125
LTC3617 (Optional)
LTC3618 (Optional)

Parts Used

Blaize Pathfinder

Pathfinder P1600 SOM Module

Blaize Pathfinder

Pathfinder P1600 SOM Module

View Detailed Reference Design Information

Features & Benefits

Blaize^® Pathfinder P1600 small form factor embedded SoM brings the programmability and efficiency benefits of the Blaize GSP^® architecture, ideal for AI inferencing workloads at the edge, to embedded systems.

Analog Devices, Inc. supports end to end power delivery solutions for Blaize Pathfinder P1600 SOM. Blaize uses Analog Devices discrete power solutions to enable their System on Chip (SoC) to deliver high compute with optimized with most TOPS/Watt performance for datacenter and Artificial Intelligence.

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:

LTC7151S
LT8609S
LTC3636
ADP1752
ADP1755

Parts Used

Versal Premium

Non-Hardware Verified Design

Versal Premium

Non-Hardware Verified Design

View Detailed Reference Design Information

Features & Benefits

Xilinx Versal^™ Premium series solves a broad range of industry-specific problems with performance and flexibility. Core use cases include storage acceleration, data center network acceleration, 5G xHaul and Passive optical networks.

Analog Devices, Inc. supports power delivery solutions for the Versal Premium Platform. Monolithic solutions are used on the Versal Premium Platform 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:

LTC3884-1
LTC7051
ADP5056
LTC7132
ADP2389
ADP5052
ADP5054
LTC7150S
LTC7151S

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
LTC7151SEV#PBF	Material Declaration	Reliability Data	28-Lead LQFN (4mm x 5mm x 0.74mm w/ EP)	Ultra Librarian SamacSys
LTC7151SEV#TRPBF	Material Declaration	Reliability Data	28-Lead LQFN (4mm x 5mm x 0.74mm w/ EP)	Ultra Librarian SamacSys
LTC7151SIV#PBF	Material Declaration	Reliability Data	28-Lead LQFN (4mm x 5mm x 0.74mm w/ EP)	Ultra Librarian SamacSys
LTC7151SIV#TRPBF	Material Declaration	Reliability Data	28-Lead LQFN (4mm x 5mm x 0.74mm w/ EP)	Ultra Librarian SamacSys
Wafer Fabrication Data		R564 Reliability Data

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Support & Discussions

LTC7151S Discussions

RE: LTC7151s output short circuit protection

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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.