LTC3876 - Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference

Features

  • Complete DDR Power Solution with VTT Reference
  • Wide VIN 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
  • tON(MIN) = 30ns, tOFF(MIN) = 90ns
  • RSENSE 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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3876 Typical Application
LTC3876 Typical Application

Description

The LTC®3876 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3876EFE#PBF TSSOP-38 FE E 05-08-1772 Yes
LTC3876EFE#TRPBF TSSOP-38 FE E 05-08-1772 Yes
LTC3876EUHF#PBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3876EUHF#TRPBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3876IFE#PBF TSSOP-38 FE I 05-08-1772 Yes
LTC3876IFE#TRPBF TSSOP-38 FE I 05-08-1772 Yes
LTC3876IUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC3876IUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes


LTC3876 Package Drawing
LTC3876 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3876EFE#PBF TSSOP-38 E $4.54 $3.18 Yes
LTC3876EFE#TRPBF TSSOP-38 E $3.24 Yes
LTC3876EUHF#PBF 5x7 QFN-38 E $4.20 $2.94 Yes
LTC3876EUHF#TRPBF 5x7 QFN-38 E $3.00 Yes
LTC3876IFE#PBF TSSOP-38 I $5.22 $3.65 Yes
LTC3876IFE#TRPBF TSSOP-38 I $3.71 Yes
LTC3876IUHF#PBF 5x7 QFN-38 I $4.79 $3.35 Yes
LTC3876IUHF#TRPBF 5x7 QFN-38 I $3.41 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1631A LTC3876EUHF Demo Board | DDR2/3, VIN = 4.5V to 14V, VDDQ = 1.8V/1.5V @ 20A, VTT = 0.9V/0.75V @ ±10A $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3876IFE#PBF TSSOP-38 I $5.22 $3.65 Yes
LTC3876IFE#TRPBF TSSOP-38 I $3.71 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Motherboard Memory
  • Servers

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice IV:
LTC3876

Technical Support