LTC3729
Info: : PRODUCTION
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LTC3729

550kHz, PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $6.94
Features
  • Wide VIN Range: 4V to 36V Operation
  • Reduces Required Input Capacitance and Power Supply Induced Noise
  • ±1% Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency: 250kHz to 550kHz
  • True Remote Sensing Differential Amplifier
  • PolyPhase Extends from Two to Twelve Phases
  • Reduces the Size and Value of Inductors
  • Current Mode Control Ensures Current Sharing
  • 1.1MHz Effective Switching Frequency (2-Phase)
  • OPTI-LOOP Compensation Reduces COUT
  • Power Good Output Voltage Indicator
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Soft-Start Current Ramping
  • Internal Current Foldback Plus Shutdown Timer
  • Overvoltage Soft-Latch Eliminates Nuisance Trips
  • Available in 5mm x 5mm QFN and 28-Lead SSOP Package
Additional Details
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The LTC3729 is a multiple phase, synchronous step-down current mode switching regulator controller that drives 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 550kHz 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 latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3729 includes a power good output pin that indicates when the output is within ±7.5% of the designed set point.

Vin Max Vref
LTC3729 36V 0.8
LTC3729L-6 30V 0.6

Applications

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

Part Models 4
1ku List Price Starting From $6.94

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3729EG#PBF
  • HTML
  • HTML
LTC3729EG#TRPBF
  • HTML
  • HTML
LTC3729EUH#PBF
  • HTML
  • HTML
LTC3729EUH#TRPBF
  • HTML
  • HTML

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Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC3729EG#PBF

PRODUCTION

LTC3729EG#TRPBF

PRODUCTION

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

arrow down

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC3729EG#PBF

PRODUCTION

LTC3729EG#TRPBF

PRODUCTION

Jan 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC509B

LTC3729EUH Demo Board | 5V to 14VIN, 2.5V @ 25A VOUT

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DC509B

LTC3729EUH Demo Board | 5V to 14VIN, 2.5V @ 25A VOUT

LTC3729EUH Demo Board | 5V to 14VIN, 2.5V @ 25A VOUT

Product Detail

Demonstration circuit 509 is a single output step down converter featuring the LTC3729EUH. The LTC3729EUH is a dual phase controller with a frequency range of 250kHz to 550kHz in a 32 lead 5mm × 5mm QFN package. The QFN package has an exposed bottom pad that is soldered to the PCB and provides the LTC3729EUH with low thermal impedance. The input voltage range of the DC509 is 5V to 14V and the output voltage is 2.5V with a load rating of 25A.

Tools & Simulations

Tools & Simulations 1

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.

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