LTC3876

RECOMMENDED FOR NEW DESIGNS

Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference

Part Models: 8
1ku List Price: Starting From $3.53

Viewing:

Overview

Complete DDR Power Solution with VTT Reference
Wide V_IN Range: 4.5V to 38V, VDDQ: 1V to 2.5V
±0.67% VDDQ Output Voltage Accuracy
VDDQ and VTT Termination Controllers
±1.2% ±50mA Linear VTTR Reference Output
Controlled On-Time, Valley Current Mode Control
Frequency Programmable from 200kHz to 2MHz Synchronizable to External Clock
t_ON(MIN) = 30ns, t_OFF(MIN) = 90ns
R_SENSE or Inductor DCR Current Sensing
Power Good Output Voltage Monitor
Overvoltage Protection and Current Limit Foldback
Thermally Enhanced 38-Pin (5mm × 7mm) QFN and TSSOP Packages

The LTC3876 is a complete DDR power solution, compatible with DDR1, DDR2, DDR3 and future DDRX lower voltage standards. The LTC3876 includes VDDQ and VTT DC/DC controllers and a precision linear VTT reference. A differential output sense amplifier and precision internal reference combine to offer an accurate VDDQ supply. The VTT controller tracks the precision VTTR linear reference with less than 20mV total DC error. The precision VTTR reference maintains 1.2% regulation accuracy tracking onehalf VDDQ over temperature for a ±50mA reference load.

The LTC3876 allows operation from 4.5V to 38V maximum at the input. The VDDQ output can range from 1.0V to 2.5V, with a corresponding VTT and VTTR output range of 0.5V to 1.25V. Voltage tracking soft-start, PGOOD and fault protection features are provided.

Applications

Motherboard Memory
Servers

Part Models: 8
1ku List Price: Starting From $3.53

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
LTC3876EFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876EFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876IFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876IFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3876IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3876EFE#PBF	PRODUCTION
LTC3876EFE#TRPBF	PRODUCTION
LTC3876EUHF#PBF	PRODUCTION
LTC3876EUHF#TRPBF	PRODUCTION
LTC3876IFE#PBF	PRODUCTION
LTC3876IFE#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LTC3876EFE#PBF	PRODUCTION
LTC3876EFE#TRPBF	PRODUCTION
LTC3876IFE#PBF	PRODUCTION
LTC3876IFE#TRPBF	PRODUCTION
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3876IUHF#PBF	PRODUCTION
LTC3876IUHF#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
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Oscillators 1
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Switching Regulators & Controllers 1
LTM4632	RECOMMENDED FOR NEW DESIGNS	Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
Temperature Sensors 1
LTC2997	PRODUCTION	Remote/Internal Temperature Sensor

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3876

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

LTC3876EUHF Demo Board | DDR2/3, VIN = 4.5V to 14V, VDDQ = 1.8V/1.5V @ 20A, VTT = 0.9V/0.75V @ ±10A

Buy Now View Details

Product Details

Demonstration circuit 1631A is a dual output DDR2 or DDR3 power supply that provides 20A at 1.8V or 1.5V (jumper-selectable) for V_DDQ and ±10A for V_TT (V_TT = 0.5V_DDQ). It also has a ±50mA V_TTR reference output. The demo board has an operating voltage range of 4.5V to 14V and a nominal 400kHz switching frequency.

Resources

DC1631A - Demo Manual
1/17/2012

DC1631A - Schematic
1/17/2012

DC1631A - Design Files
1/17/2012

Latest Discussions

1 Years Ago

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1