LTC3829 - 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp
Datasheet 
DocumentationDatasheet
Application Note
- AN133 - A Closed-Loop, Wideband, 100A Active Load
- AN140 - Basic Concepts of Linear Regulator and Switching Mode Power Supplies
Design Note
Reliability Data
Press Release
cad_symbol
ltspice
- LTC3829 Demo Circuit - 3-Phase Single Output Step-Down Regulator (7-14V to 1.5V @ 60A)
- LTC3829 Demo Circuit - 6-Phase Single Output Step-Down Regulator (7-14V to 1.5V @ 120A)
LTpowerCAD
- LTC3829 Project - 3-Phase, Single Output Synchronous Step-Down Supply with Vout Remote Sense & Inductor DCR Current Sensing (7-14V to 1.5V @ 60A)
- LTC3829 Project - 3-Phase, Single Output Synchronous Step-Down Supply with Vout Remote Sense & Rsense Current Sensing (11-13V to 1V @ 90A)
- LTC3829 Project - 3-Phase, Single Output Synchronous Step-Down Supply with Vout Remote Sense & Rsense Current Sensing (7-14V to 1.5V @ 60A)
- LTC3829 Project - 6-Phase, Single Output Synchronous Step-Down Supply with Vout Remote Sense (7-14V to 1.5V @ 120A)
- LTC3829 Project - 6-Phase, Single Output Synchronous Step-Down Supply with Vout Remote Sensing & Inductor DCR Current Sense (7-14V to 1.5V @ 120A)
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
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.
5x7 QFN-38,TSSOP-38
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3829EFE#PBF | TSSOP | 38 | E | $5.80 | $4.06 |
| LTC3829EFE#TRPBF | TSSOP | 38 | E | $4.12 | |
| LTC3829EUHF#PBF | QFN | 38 | E | $5.30 | $3.71 |
| LTC3829EUHF#TRPBF | QFN | 38 | E | $3.77 | |
| LTC3829IFE#PBF | TSSOP | 38 | I | $6.56 | $4.59 |
| LTC3829IFE#TRPBF | TSSOP | 38 | I | $4.65 | |
| LTC3829IUHF#PBF | QFN | 38 | I | $6.13 | $4.29 |
| LTC3829IUHF#TRPBF | QFN | 38 | I | $4.35 |
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 Buck, 7V ≤ VIN ≤ 14V, Vout = 1.5V @ 60A | $150.00 | |
| DC1675A | LTC3829EUH Demo Board | LTC3829(x2) 3-Phase Buck, 7V ≤ VIN ≤ 14V, VOUT= 1.5V @ 120A | $150.00 |