LTC3829 - 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp

Features

  • Optional Nonlinear Control for Fast Response
  • ±0.75%, 0.6V Reference Accuracy
  • PWM, Stage Shedding™ or Burst Mode® Operation
  • High Efficiency: Up to 95%
  • RSENSE or DCR Current Sensing
  • Programmable DCR Temperature Compensation
  • Phase-Lockable Fixed Frequency: 250kHz to 770kHz
  • True Remote Sense Differential Amplifier
  • Programmable Active Voltage Positioning (AVP)
  • Triple N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 38V Operation
  • VOUT Range: 0.6V to 5V without Diffamp
  • VOUT Range: 0.6V to 3.3V with Diffamp
  • Clock Input and Output for 6-Phase Operation
  • Adjustable Soft-Start or VOUT Tracking
  • 38-Pin (5mm × 7mm) QFN and FE Packages
  • Applications

Typical Application

LTC3829 Typical Application
LTC3829 Typical Application

Description

The LTC3829 is a high performance 3-phase single output synchronous step-down DC/DC switching controller that drives all N‑channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and noise due to ESR of the input capacitors are minimized by operating the three controller output stages out of phase.

The LTC3829 can be configured for 6-phase operation, has DCR temperature compensation, and output foldback current limiting. This device features a precision 0.6V reference and a power good indicator.

Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode operation. A differential amplifier provides true remote sensing of the output voltage at the point of load.

The LTC3829 is available in both low profile 38-pin 5mm x 7mm QFN and Exposed Pad FE packages.

Packaging

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

QFN-38, TSSOP-38

LTC3829 Package Drawing
LTC3829 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3829EFE#PBF TSSOP 38 E $5.80 $4.06 View
LTC3829EFE#TRPBF TSSOP 38 E $4.12 View
LTC3829EUHF#PBF QFN 38 E $5.30 $3.71 View
LTC3829EUHF#TRPBF QFN 38 E $3.77 View
LTC3829IFE#PBF TSSOP 38 I $6.56 $4.59 View
LTC3829IFE#TRPBF TSSOP 38 I $4.65 View
LTC3829IUHF#PBF QFN 38 I $6.13 $4.29 View
LTC3829IUHF#TRPBF QFN 38 I $4.35 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
DC1530A LTC3829EUHF Demo Board | 3-Phase, Synchronous Regulators with Diffamp. $150.00
DC1675A LTC3829EUH Demo Board | 7V VIN 14V, VOUT= 1.5V @ 120A. $150.00
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Click here to view our complete list of demo boards

Applications

  • Applications
  • Notebook and Palmtop Computers
  • Telecom Systems
  • Portable Instruments
  • DC Power Distribution Systems

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Design Tools

LTpowerCAD

The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3829

LTspiceIV

LTspice IV 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 IV

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3829

Technical Support