LTC3415

PRODUCTION

7A, PolyPhase Synchronous Step-Down Regulator

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Overview

  • High Efficiency: Up to 96%
  • 7A Output Current at VIN = 3V
  • Adjustable Frequency: 1.5MHz Nominal
  • PolyPhase Operation (Up to 12 Phases)
  • Spread Spectrum Frequency Modulation
  • Output Tracking and Margining
  • ±1% Reference Accuracy
  • 2.5V to 5.5V VIN Range
  • Phase Lockable from 0.75MHz to 2.25MHz
  • Selectable Burst Mode® Operation
  • Low Dropout Operation: 100% Duty Cycle
  • Low Quiescent Current: 450µA
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Shutdown Mode Draws Only 0.2µA Supply Current
  • Available in 38-Pin (5mm × 7mm) QFN Package

The LTC3415 is a high efficiency, monolithic synchronous buck regulator using a phase lockable constant frequency, current mode architecture. PolyPhase® operation allows multiple LTC3415s to run out of phase while using minimal input and output capacitance. The operating supply range is from 5.5V down to 2.5V, making it suitable for single Lithium-Ion battery as well as point of load power supply applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation that extends operating time in battery-operated systems.

The operating frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be externally synchronized from 0.75MHz to 2.25MHz. The PHMODE pin allows user control of the phase of the outgoing clock signal. The current sense comparator is factory trimmed for accurate output current sharing. Burst Mode operation is inhibited during synchronization or when the MODE pin is pulled low to reduce noise and RF interference.

Applications

  • Point of Load Power Supply
  • Portable Instruments
  • Distributed Power Systems
  • Battery-Powered Equipment
LTC3415
7A, PolyPhase Synchronous Step-Down Regulator
High Efficiency Step-Down Converter Efficiency and Power Loss Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

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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Hardware Ecosystem

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Supervisory Circuits & Reset ICs 1
LTC2935
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3415

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3415
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC768A

LTC3415EUHF(×2) Demo Board - 7A | Polyphase, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.6V to 5V @ 15A

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Product Details

Demonstration Circuit 768 is a 15A high efficiency, phase lockable constant frequency buck converter, incorporating two LTC3415 polyphase monolithic synchronous regulators. The DC768 has an input voltage range of 2.5V to 5.5V and an output voltage range from 0.6V to 5V. The output voltage of the DC768 can be set to 1.2V, 1.5V or 1.8V using the appropriate jumper connection, or it can be set to an adjustable value down to 0.6V, the reference voltage of the LTC3415.


Since the parallel LTC3415s operate out-of-phase, the amount of input and output capacitance required will be minimal.

eval board
schematic 2
DC725A

LTC3415EUHF Demo Board | 2.375 ≤ VIN ≤ 5.5V, VOUT = 0.6V to 5V @ 7A

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Product Details

Demonstration Circuit 725 is a 7A high efficiency, phase-lockable constant frequency buck converter, incorporating the LTC3415 polyphase monolithic synchronous regulator. The DC725 has an input voltage range of 2.375V to 5.5V and an output voltage range from 0.6V to 5V. The output voltage can be set to 1.2V, 1.5V or 1.8V using the appropriate jumper connection, or it can be set to an adjustable value down to 0.6V, the reference voltage of the LTC3415. The DC725 can deliver high power for a monolithic part (up to 7A of output current) due to the high current power switches (28 mΩ of onstate resistance) of the LTC3415.


The LTC3415 can also do polyphase operation, which allows multiple DC725s to be used in parallel for higher current power supplies. Since the parallel LTC3415s can operate out-of-phase, the amount of input and output capacitance required will be minimal.
DC768A
LTC3415EUHF(×2) Demo Board - 7A | Polyphase, 2.5V ≤ VIN ≤ 5.5V, VOUT = 0.6V to 5V @ 15A
DC768A - Schematic
DC725A
LTC3415EUHF Demo Board | 2.375 ≤ VIN ≤ 5.5V, VOUT = 0.6V to 5V @ 7A
DC725A - Schematic

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