LTC3730

PRODUCTION

3-Phase, 5-Bit Intel Mobile VID, 600kHz, Synchronous Buck Controller

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Overview

  • 3-Phase Current Mode Controller with Onboard MOSFET Drivers
  • ±5% Output Current Match Optimizes Thermal Performance and Size of Inductors and MOSFETs
  • Operational Amplifier Accomodates Mode Switching
  • ±1% VREF Accuracy Over Temperature
  • Reduced Input and Output Capacitance
  • Reduced Power Supply Induced Noise
  • VOUT Programmable from 0.6V to 1.75V (IMVP III)
  • ±10% Power Good Output Indicator
  • 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
  • PWM, Stage Shedding™ or Burst Mode® Operation
  • OPTI-LOOP® Compensation Minimizes COUT
  • Adjustable Soft-Start Current Ramping
  • 4V, VIN,Undervoltage RUN/SS Reset/Reattempt Circuit
  • Short-Circuit Shutdown Timer with Defeat Option
  • Overvoltage Soft Latch
  • Small 36-Lead Narrow (0.209”) SSOP Package

The LTC3730 is a PolyPhase® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS losses in both the input and output filter capacitors. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode technology.

An internal operational amplifier provides mode selectable output voltage programming in conjunction with the internal VID voltage control DAC.

Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. Current foldback provides protection for the external MOSFETs under short-circuit or overload conditions.

Applications

  • Tablet Computers
  • High Performance Notebook Computers
  • High Output Current DC/DC Power Supplies
LTC3730
3-Phase, 5-Bit Intel Mobile VID, 600kHz, Synchronous Buck Controller
Figure 1. High Current Triple Phase Step-Down Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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