LTC3823

PRODUCTION

Fast No R_SENSE^™ Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL

Part Models: 8
1ku List Price: Starting From $3.31

Viewing:

Overview

Wide V_IN Range: 4.5V to 36V
±0.67%, 0.6V Reference Voltage
Output Voltage Tracking Capability
True Remote Sensing Differential Amplifier
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) < 100ns
Phase-Locked Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: 30μA
Power Good Output Voltage Monitor Tracks the Reference Input Pin
Available in (5mm × 5mm) 32-Lead QFN and 28-Lead SSOP Narrow Packages

The LTC3823 is a synchronous step-down switching regulator controller with true remote differential output sensing and output voltage up/down tracking capability. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.

The LTC3823 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.

Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to as low as a 0.6V output. When using remote sense, output voltages up to 3.3V can be developed, and up to 90% of V_IN without remote sense. Power supply sequencing is accomplished using an external soft-start timing capacitor.

Applications

Distributed Power Systems
Server Power Supplies

Part Models: 8
1ku List Price: Starting From $3.31

Documentation

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
LTC3823EGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823EGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823IGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823IGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823IUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3823IUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3823EGN#PBF	PRODUCTION
LTC3823EGN#TRPBF	PRODUCTION
LTC3823IGN#PBF	PRODUCTION
LTC3823IGN#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3823EGN#PBF	PRODUCTION
LTC3823EGN#TRPBF	PRODUCTION
LTC3823IGN#PBF	PRODUCTION
LTC3823IGN#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3823EUH#PBF	PRODUCTION
LTC3823EUH#TRPBF	PRODUCTION
LTC3823IUH#PBF	PRODUCTION
LTC3823IUH#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3823EUH#PBF	PRODUCTION
LTC3823EUH#TRPBF	PRODUCTION
LTC3823IUH#PBF	PRODUCTION
LTC3823IUH#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LTC3823 Demo Circuit - No Rsense, Synchronous Step-Down Controller (12V to 2.5V @ 10A)

Models for the following parts are available in LTspice:

LTC3823

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.

Evaluation Kits

LTC3823EUH Demo Board | 4.5V ≤ VIN ≤ 16V, VOUT = 2.5V @ 10A

Buy Now View Details

Product Details

Demonstration circuit 1021A is a high efficiency synchronous step-down DC/DC converter with 4.5V to 16V input range. It can provide 2.5V output with 10A maximum current. The demo board features the LTC3823EUH controller.

Resources

DC1021A - Demo Manual
9/24/2009

DC1021A - Schematic
9/24/2009

DC1021A - Design File
9/24/2009

Latest Discussions

No discussions on LTC3823 yet. Have something to say?

Start a Discussion on EngineerZone®