LTC1625

PRODUCTION

LTC1625

No R_SENSE^™ Current Mode Synchronous Step-Down Switching Regulator

PRODUCTION

Figure 1. High Efficiency Step-Down Converter slide

Figure 1. High Efficiency Step-Down Converter

Not the part you were looking for?

Go to Product Selection Table

View All Documentation

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 $6.52

Features

Highest Efficiency Current Mode Controller
No Sense Resistor Required
Stable High Current Operation
Dual N-Channel MOSFET Synchronous Drive
Wide V_IN Range: 3.7V to 36V
Wide V_OUT Range: 1.19V to V_IN
±1% 1.19V Reference
Programmable Fixed Frequency with Injection Lock
Very Low Drop Out Operation: 99% Duty Cycle
Forced Continuous Mode Control Pin
Optional Programmable Soft Start
Pin Selectable Output Voltage
Foldback Current Limit
Output Overvoltage Protection
Logic Controlled Micropower Shutdown: IQ < 30µA
Available in 16-Lead Narrow SSOP and SO Packages

Additional Details

The LTC1625 is a synchronous step-down switching regulator controller that drives external N-Channel power MOSFETs using few external components. Current mode control with MOSFET V_DS sensing eliminates the need for a sense resistor and improves efficiency. The frequency of a nominal 150kHz internal oscillator can be synchronized to an external clock over a 1.5:1 frequency range.

Burst Mode^™ operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded.

Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. A wide supply range allows operation from 3.7V (3.9V for LTC1625I) to 36V at the input and 1.19V to V_IN at the output.

Applications

Notebook and Palmtop Computers, PDAs
Cellular Telephones and Wireless Modems
Battery Chargers
Distributed Power

View All Documentation

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 $6.52

Technical Documents 10

LTC1625: No RSENSE Current Mode Synchronous Step-Down Switching Regulator Data Sheet 08/30/2007

R384 Reliability Data 03/26/2018

DC2008A - Demo Manual 07/30/2014

AN84 - Linear Technology Magazine Circuit Collection, Volume IV 08/20/2007

Design Solutions 8 - 2-Step Power Conversion: Portable Power for the Future 08/21/2007

Design Solutions 8 - 2-Step Power Conversion: Portable Power for the Future 11/06/2022

Design Note 233: Unique High Efficiency 12V Converter Operates with Inputs from 6V to 28V 06/01/2000

Single-Inductor, Positive-Output Buck/Boost Converter Uses No RSENSE Controller 06/01/1999

The LTC1625 Current Mode DC/DC Controller Eliminates the Sense Resistor 08/01/1998

No R_SENSE Controller Delivers 12V and 100W at 97% Efficiency 02/01/1999

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
LTC1625CGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625CGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625CS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625CS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625IS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1625IS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1625CGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625CGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625CS#PBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625CS#TRPBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625IGN#PBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625IGN#TRPBF
Pin/Package Drawing
16-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625IS#PBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1625IS#TRPBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LTC1625CS#PBF

PRODUCTION

LTC1625CS#TRPBF

PRODUCTION

LTC1625IS#PBF

PRODUCTION

LTC1625IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LTC1625CS#PBF

PRODUCTION

LTC1625CS#TRPBF

PRODUCTION

LTC1625IS#PBF

PRODUCTION

LTC1625IS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Oct 11, 2022

- 22_0235

Epoxy Change from Henkel 8290 to 8290A for GN Package

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN22_0235_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Apr 6, 2022

- 22_0066

Laser Top Mark for 16QSOP Assembled in ADPG [PNG]

LTC1625CGN#PBF

PRODUCTION

LTC1625CGN#TRPBF

PRODUCTION

LTC1625IGN#PBF

PRODUCTION

LTC1625IGN#TRPBF

PRODUCTION

pdf

PCN22_0066_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LTC1625CS#PBF

PRODUCTION

LTC1625CS#TRPBF

PRODUCTION

LTC1625IS#PBF

PRODUCTION

LTC1625IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LTC1625CS#PBF

PRODUCTION

LTC1625CS#TRPBF

PRODUCTION

LTC1625IS#PBF

PRODUCTION

LTC1625IS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 4

Parts	Product Life Cycle	Description
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

DC2008A

LTC1625IGN Demo Board | 4.5V ≤ VIN ≤ 28V; VOUT = 3.3V @ 15A

DC2008A

LTC1625IGN Demo Board | 4.5V ≤ VIN ≤ 28V; VOUT = 3.3V @ 15A

Buy Now View Details

Product Detail

Demonstration circuit DC2008 is DC/DC buck converter featuring the LTC1625 constant frequency current mode buck controller. The DC2008A operates over a 4.5V to 28V input and provides 15A of output current as shown in Figure 3. The 225kHz constant frequency operation results in a small and efficient circuit. The converter provides high output voltage accuracy (typically ±3%) over a wide load range with no minimum load requirement. The demonstration circuit can be easily modified to generate different output voltages.

Resources

PDF

DC2008A - Demo Manual

216.00K

PDF

DC2008A - Schematic

51.00K

ZIP

DC2008A - Design Files

1.00M

DC2008A

LTC1625IGN Demo Board | 4.5V ≤ VIN ≤ 28V; VOUT = 3.3V @ 15A

LTspice 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.

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.