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

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

QFN-38, TSSOP-38

LTC3876 Package Drawing
LTC3876 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3876EFE#PBF TSSOP 38 E $4.54 $3.18 View
LTC3876EFE#TRPBF TSSOP 38 E $3.24 View
LTC3876EUHF#PBF QFN 38 E $4.20 $2.94 View
LTC3876EUHF#TRPBF QFN 38 E $3.00 View
LTC3876IFE#PBF TSSOP 38 I $5.22 $3.65 View
LTC3876IFE#TRPBF TSSOP 38 I $3.71 View
LTC3876IUHF#PBF QFN 38 I $4.79 $3.35 View
LTC3876IUHF#TRPBF QFN 38 I $3.41 View
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* 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
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Click here to view our complete list of demo boards

Applications

  • Motherboard Memory
  • Servers

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Design Tools

LTspiceIV

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

Technical Support