LTC3729

PRODUCTION

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

Part Models: 4
1ku List Price: Starting From $6.94

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Part Details

Wide V_IN 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 C_OUT
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

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

Documentation

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3729EG#PBF	28-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3729EG#TRPBF	28-Lead SSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3729EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3729EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG
		PCN22_0171_Form Material_Report Delta Qualification Matrix
LTC3729EG#PBF	PRODUCTION
LTC3729EG#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3729EUH#PBF	PRODUCTION
LTC3729EUH#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3729
LTC3729L-6

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

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

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Product Details

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.

Resources

DC509B - Demo Manual
9/24/2009

DC509B - Design File
9/24/2009

DC509B - Schematic
9/24/2009

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LTC3729

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 1

Technical Articles 2

Webcast 1