1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC1629


Overview

Features and Benefits

  • Dual Controller Operates from One to Twelve Phases
  • Reduces Required Input Capacitance and Power Supply Induced Noise
  • Current Mode Control Ensures Current Sharing
  • Phase-Lockable Fixed Frequency: 150kHz to 300kHz
  • 1.8MHz Effective Switching Frequency
  • True Remote Sensing Differential Amplifier
  • OPTI-LOOP Compensation Reduces COUT
  • ±1% Output Voltage Accuracy
  • Power Good Output Voltage Monitor (LTC1629-PG)
  • Wide VIN Range: 4V to 36V Operation
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Soft-Start Current Ramping
  • Internal Current Foldback Plus Shutdown Timer
  • Overvoltage Soft-Latch Eliminates Nuisance Trips
  • Micropower Shutdown
  • Available in 28-Lead SSOP Package

Product Details

The LTC1629/LTC1629-PG are multiple phase, dual, synchronous step-down current mode switching regulator controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The PolyPhase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The output clock signal allows expansion for up to 12 evenly phased controllers for systems requiring 15A to 200A of output current. The multiple phase technique effectively multiplies the fundamental frequency by the number of channels used, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.

An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required for high current applications.

A RUN/SS pin provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latch-off is disabled. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC1629-PG includes a power good output pin that replaces the AMPMD control pin of the LTC1629.

Applications

  • Desktop Computers
  • Internet Servers
  • Large Memory Arrays
  • DC Power Distribution Systems

Product Lifecycle icon-recommended 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 (4)

Tools & Simulations

LTspice

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.

LTspice

Models for the following parts are available in LTspice:

LTC1629
LTC1629-6
LTC1629-PG

Design Resources

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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1629CG#PBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629CG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629CG-PG#PBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629CG-PG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629IG#PBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629IG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629IG-PG#PBF Material Declaration Reliability Data 28-Lead SSOP
LTC1629IG-PG#TRPBF Material Declaration Reliability Data 28-Lead SSOP
Wafer Fabrication Data R384 Reliability Data

PCN-PDN Information

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Sample & Buy


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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.