LTC1629

PRODUCTION

PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator

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Overview

  • 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

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
LTC1629
PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
Figure 1. High Current Dual Phase Step-Down Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 3

Application Note 1

Design Note 4

Technical Articles 2

Data Sheet

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

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1629
  • LTC1629-6
  • LTC1629-PG
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.

Evaluation Kits

eval board
schematic 1
DC311A

LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, VIN = 12V, VOUT = 1.1V~1.8V @ 60A

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Product Details

DC311A Demo Board for:
LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
LTC1709-9 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

eval board
schematic 2
DC256A

LTC1629CG | 6 Phase, Very High Current, Low Voltage Power Supply, 5 to 12VIN, 3.3VOUT @ 90A or 5VOUT @ 60Amps

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Product Details

DC256A: Demo Board for the LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator.

eval board
schematic 3
DC226A

LTC1629CG | Polyphase DC-DC Converter, 5 to 13VIN, 3.3VOUT @ 20A

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Product Details

DC226A: Demo Board for the LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator.

eval board
schematic 4
DC352A

LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14VIN, 1.6VOUT @ 52A Max., 2.5VOUT @ 15A Max (Thru-Hole Input Caps)

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Product Details

DC352A Demo Board for:
LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
LTC1628-SYNC High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
DC311A
LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, VIN = 12V, VOUT = 1.1V~1.8V @ 60A
DC311A - Schematic
DC256A
LTC1629CG | 6 Phase, Very High Current, Low Voltage Power Supply, 5 to 12VIN, 3.3VOUT @ 90A or 5VOUT @ 60Amps
DC256A - Schematic
DC226A
LTC1629CG | Polyphase DC-DC Converter, 5 to 13VIN, 3.3VOUT @ 20A
DC226A - Schematic
DC352A
LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14VIN, 1.6VOUT @ 52A Max., 2.5VOUT @ 15A Max (Thru-Hole Input Caps)
DC352A - Schematic

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