LTC7149

RECOMMENDED FOR NEW DESIGNS

LTC7149

60V, 4A Synchronous Step-Down Regulator for Inverting Outputs

RECOMMENDED FOR NEW DESIGNS

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Part Models 8

1ku List Price Starting From $6.72

Features

Wide V_IN Range: 3.4V to 60V
Wide V_OUT Range: 0V to –28V
Single Resistor V_OUT Programming
Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
Regulated I_Q: 440μA, Shutdown I_Q: 15μA
Board GND Referenced I/O Pins (RUN, PGOOD, MODE/SYNC)
Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
92% Efficiency with 12 V_IN and –5V_OUT
±0.8% Output Voltage Accuracy
Peak Current Mode Operation
Burst Mode^® Operation, Forced Continuous Mode
Programmable Soft-Start
Overtemperature Protection
Available in 28-Lead (4mm x 5mm) QFN and TSSOP Packages

Additional Details

The LTC7149 is a high efficiency 60V, 4A synchronous monolithic step-down regulator for inverting output applications. The regulator features a single resistor programmable output voltage and high efficiency over a wide V_OUT range.

The inverting regulator operates from an input voltage range of 3.4V to 60V and provides an adjustable output from (–28V) to zero volts while delivering up to 4A of inductor current. The switching frequency is also set with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/SYNC pin can also be used to synchronize the switching frequency to an external clock. Internal level-shift circuits allow the I/O pins (RUN, MODE/SYNC, PGOOD) to be referenced to board GND.

The LTC7149 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection.

Applications

Industrial Applications
Telecom Power Supplies
Distributed Power Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 8

1ku List Price Starting From $6.72

Technical Documents 4

LTC7149: 60V, 4A Synchronous Step-Down Regulator for Inverting Outputs Data Sheet 02/10/2016

R539 Reliability Data 03/26/2018

DC2354A - Demo Manual 04/06/2016

Design Note 552: Inverting Regulator Takes Inputs Up to 50V and Supports Outputs to 4A 05/25/2016

Design Resources 8

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
LTC7149EFE#PBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149EFE#TRPBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149IFE#PBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149IFE#TRPBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7149IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC7149EFE#PBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149EFE#TRPBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149EUFD#PBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149EUFD#TRPBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149IFE#PBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149IFE#TRPBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149IUFD#PBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC7149IUFD#TRPBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

May 17, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149EUFD#PBF

PRODUCTION

LTC7149EUFD#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

LTC7149IUFD#PBF

PRODUCTION

LTC7149IUFD#TRPBF

PRODUCTION

pdf

PCN19_0067_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Qualification Results Summary

Detailed Parts List

pdf

Other

Filter by Model

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

May 17, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LTC7149EFE#PBF

PRODUCTION

LTC7149EFE#TRPBF

PRODUCTION

LTC7149EUFD#PBF

PRODUCTION

LTC7149EUFD#TRPBF

PRODUCTION

LTC7149IFE#PBF

PRODUCTION

LTC7149IFE#TRPBF

PRODUCTION

LTC7149IUFD#PBF

PRODUCTION

LTC7149IUFD#TRPBF

PRODUCTION

pdf

PCN19_0067_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Qualification Results Summary

Detailed Parts List

pdf

Other

Companion Parts 1

Parts	Product Life Cycle	Description
Surge Stopper, Overvoltage, and Overcurrent Protection1
LTC4367	RECOMMENDED FOR NEW DESIGNS	100V Overvoltage, Undervoltage and Reverse Supply Protection Controller

Alternative Parts 1

Parts	Product Life Cycle	Description
LTC3649	RECOMMENDED FOR NEW DESIGNS	60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

DC2354A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

Download

DC2354A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

Buy Now View Details

Product Detail

Demonstration circuit 2354A is a high input voltage, high efficiency synchronous monolithic step-down converter with a negative output voltage featuring the LTC7149. DC2354A has a wide input voltage range from 3.5V up to 55V. The output voltage of the DC2354A can be set to –3.3V or –5V, and the “User Select” option allows the output voltage to be set from 0V to –60V; however the voltage difference between the output voltage (–V_OUT) and maximum input voltage (V_IN), should not exceed 60V. |–V_OUT| + V_IN < 60V. DC2354A is capable of delivering up to 4A of output current, nevertheless at lower input voltages, the load current should be reduced in accordance with the derating curves. DC2354A supports three operation modes: fixed-frequency modulation, Burst Mode^™ operation and synchronization to an external clock. Fixed-frequency mode maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode operation employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Resources

ZIP

DC2354A - Design Files

3.00M

PDF

DC2354A - Schematic

36.00K

PDF

DC2354A - Demo Manual

501.00K

DC2354A

LTC7149 Demo Board | Buck Configured as Negative VOUT; 3.5V ≤ VIN ≤ 55V; VOUT = –3.3V/–5V/Adjustable to –56V @ up to 4A

LTspice 3

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.

Lt Spice

LTC7149 - Switching Regulators

2.18 K

Lt Spice

LTC7149 Demo Circuit - Inverting Buck Regulator (3.4-55V to -5V @ 2.5A)

5.00K

Lt Spice

LTC7149 Demo Circuit - Inverting Buck Regulator with Output Voltage Control (3.4-50Vin, 2.5 to -10Vout @ 2A)

5.00K

LTpowerCAD 1

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