LTC1709

PRODUCTION

2-Phase, 5-Bit Adjustable,High Efficiency, Synchronous Step-Down Switching Regulator

Data Sheet Product Selection Table
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Overview

  • Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise
  • 5-Bit VID Control (VRM 8.4 Compliant)
    VOUT: 1.3V to 3.5V in 50mV/100mV Steps
  • Current Mode Control Ensures Current Sharing
  • True Remote Sensing Differential Amplifier
  • OPTI-LOOP™ Compensation Minimizes COUT
  • Programmable Fixed Frequency: 150kHz to 300kHz—Effective 300kHz to 600kHz Switching Frequency
  • ±1% Output Voltage Accuracy
  • Wide VIN Range: 4V to 36V Operation
  • Adjustable Soft-Start Current Ramping
  • Internal Current Foldback
  • Short-Circuit Shutdown Timer with Defeat Option
  • Overvoltage Soft-Latch Eliminates Nuisance Trips
  • Low Shutdown Current: 20µA
  • Small 36-Lead Narrow (0.209") SSOP Package

The LTC1709 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase 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 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at a 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 in high current applications.

The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipaton during short-circuit conditions when overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.

Vout Range VRM
LTC1709 1.3V to 3.5V VRM8.4
LTC1709-7 0.925V to 2V Mobile
LTC1709-8 1.3V to 3.5V VRM8.4
LTC1709-85 1.05V to 1.825V VRM8.5
LTC1709-9 1.1V to 1.85V VRM9.0

Applications

  • Desktop Computers
  • Internet/Network Servers
  • Large Memory Arrays
  • DC Power Distribution Systems
  • Battery Chargers
LTC1709
2-Phase, 5-Bit Adjustable,High Efficiency, Synchronous Step-Down Switching Regulator
Figure 1. High Current 2-Phase Step-Down Converter Efficiency Curve Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Technical Articles 1

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

Parts Product Life Cycle Description
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1709
  • LTC1709-7
  • LTC1709-8
  • LTC1709-85
  • LTC1709-9
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.

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