Features and Benefits
- 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
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 × 7mm QFN and Exposed Pad FE packages.
- Notebook and Palmtop Computers
- Telecom Systems
- Portable Instruments
- DC Power Distribution Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit 1675A is a high efficiency, 6-phase, synchronous buck converter with a 7V to 14V input range that utilizes two LTC3829 controllers. It can supply 120A maximum load current with a 1.5V output voltage. The LTC3829 is a feature-rich single-output 3-phase synchronous buck controller with on-chip drivers and remote output voltage sensing.
Demonstration circuit 1530A is a high efficiency, 3-phase, synchronous buck converter with a 7V to 14V input range. It can supply 1.5V @ 60A maximum load current. The demo board uses the LTC3829EUHF controller. The LTC3829 is a feature-rich, single output, 3-phase synchronous buck controller with on-chip drivers, remote output voltage sensing, inductor DCR temperature compensation, phase shedding, nonlinear control and adaptive voltage positioning (AVP). It is suitable for inputs from 4.5V to 38V and outputs up to 5V.
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
Design tools for the following parts are available in LTpowerCAD:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.