LTC3876

RECOMMENDED FOR NEW DESIGNS

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

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Part Models
8
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Part Details

  • 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
LTC3876
Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and ±50mA VTT Reference
DDR3 1.5V VDDQ/20A 0.75VTT/±10A 4.5V to 14V Input Efficiency/Power Loss VDDR Channel 1 Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Analog Temperature Sensors 1
LTC2997
PRODUCTION Remote/Internal Temperature Sensor
DDR/QDR Memory Bus Termination 1
LTM4632
RECOMMENDED FOR NEW DESIGNS Ultrathin, Triple Output, Step-Down μModule Regulator for DDR-QDR4 Memory
Digital Temperature Sensors 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
Silicon Oscillators 1
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3876
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Evaluation Kits

eval board
schematic 1
DC1631A

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

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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 VDDQ and ±10A for VTT (VTT = 0.5VDDQ). It also has a ±50mA VTTR reference output. The demo board has an operating voltage range of 4.5V to 14V and a nominal 400kHz switching frequency.
DC1631A
LTC3876EUHF Demo Board | DDR2/3, VIN = 4.5V to 14V, VDDQ = 1.8V/1.5V @ 20A, VTT = 0.9V/0.75V @ ±10A
DC1631A - Schematic

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