LTC3623

RECOMMENDED FOR NEW DESIGNS

LTC3623

15V, ±5A Rail-to-Rail Synchronous Buck Regulator

RECOMMENDED FOR NEW DESIGNS

LTC3623 Typical Application Image 1 slide

LTC3623 Typical Application Image 2 slide

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1ku List Price Starting From $4.72

Features

Single Resistor Programmable V_OUT: 0V to V_IN – 0.5V
Silent Switcher^® Architecture
I_ISET Accuracy: ±1%
Tight V_OUT Regulation Across V_OUTRange
Output Current Monitor Accuracy: ±5%
Programmable Wire Drop Compensation
Easy to Parallel for Higher Current and Heat Spreading
Input Supply Voltage Regulation Loop
High Efficiency: Up to 96%
Output Current: ±5A
Integrated N-MOSFETs (60mΩ Top & 30mΩ Bottom)
Adjustable Switching Frequency: 400KHz to 4MHz
V_IN Range: 4V to 15V
Current Mode Operation for Excellent Line and Load Transient Response
Shutdown Mode Draws Less Than 1µA Supply Current
Low Profile 24-Lead 3mm × 5mm QFN Package

Additional Details

TheLTC3623 is a high efficiency, monolithic synchronous buck regulator in which the output voltage is programmed with a single external resistor. The accurate internally generated 50µA current source on the ISET pin allows the user to program an output voltage from 0V to 0.5V below V_IN. The user can also directly drive the ISET pin with an external voltage supply to program the converter’s V_OUT. The V_OUT voltage is fed directly back to the error amplifier to be regulated to the ISET voltage. The operating supply voltage range for the SV_IN pin is from 15V down to 4V, while the PV_IN pin’s voltage range is 15V down to 1.5V, making it suitable for dual Li-Ion batteries and for taking power from a 12V or 5V rail.

The operating frequency is programmable from 400KHz to 4MHz with an external R_T resistor. Higher switching frequency allows the use of smaller surface mount inductors while lower frequency allows for higher power efficiency. The unique constant-frequency/controlled on-time architecture is ideal for high step-down ratio applications that are operating at high frequency while demanding fast transient response.

Applications

Tracking Supply or DDR Memory Supply
ASIC Substrate Biasing
Point-of-Load (POL) Power Supply
Portable Instruments, Battery-Powered Equipment
Thermo Electric Cooler (TEC) Systems

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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 4

1ku List Price Starting From $4.72

Technical Documents 5

LTC3623: 15V, ±5A Rail-to-Rail Synchronous Buck Regulator Data Sheet 07/21/2017

R526 Reliability Data 03/26/2018

DC2131A - Demo Manual 11/29/2016

DN560 - High Efficiency, 15V Rail-to-Rail Output Synchronous Step-Down Regulator Can Source or Sink 5A 01/20/2017

High Efficiency, 15V Rail-to-Rail Output Synchronous Step-Down Regulator Can Source or Sink 5A 01/23/2017

Reference Materials 3

Silent Switcher Technology 08/15/2023

Understanding Silent Switcher Technology: High Efficiency, Low EMI eBook 07/14/2023

Improving Switch-Mode Power Supplies Using Noise Cancelling Technology 03/17/2023

Design Resources 4

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
LTC3623EUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3623EUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3623IUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3623IUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3623EUDD#PBF
Pin/Package Drawing
24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3623EUDD#TRPBF
Pin/Package Drawing
24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3623IUDD#PBF
Pin/Package Drawing
24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3623IUDD#TRPBF
Pin/Package Drawing
24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Alternative Parts 2

Parts	Product Life Cycle	Description
LTC3600	RECOMMENDED FOR NEW DESIGNS	15V, 1.5A Synchronous Rail-to-Rail Single Resistor Step-Down Regulator
LTC3649	RECOMMENDED FOR NEW DESIGNS	60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

DC2131A

LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A

DC2131A

LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A

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Product Detail

Demonstration circuit 2131A is a current mode DC/DC step-down Silent Switcher^® buck regulator featuring the LTC3623. The board operates from an input range of 4V to 15V, and provides ±5A of output current. The output voltage of the demonstration board can be set from 0V to V_IN – 0.5V. It operates at 1MHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. A power good output and current monitor signal are provided. Discontinuous conduction mode can be selected with a jumper. The demonstration board has options for cable drop compensation, negative output voltage and input voltage regulation.

Resources

PDF

DC2131A - Demo Manual

491.00K

ZIP

DC2131A - Design Files

1.00M

PDF

DC2131A - Schematic

38.00K

DC2131A

LTC3623 Demo Board | Silent Switcher Sync Buck, 4V ≤ VIN ≤ 15V, VOUT = 1V/1.5V/2.5V/3.3V/5V @ ±5A

LTspice 1

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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.