LTC1709-9 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

The LTC®1709-8/LTC1709-9 are 2-phase, VID programmable, synchronous step-down switching regulator controllers that drive two 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 from 150kHz 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 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.

The RUN/SS pin provides 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 for a wide range of output capacitors and ESR values. The LTC1709-8/LTC1709-9 implement two different VID tables compliant with VRM8.4 and VRM9.0 respectively.

特点
  • Single Controller Operates Two Output Stages Antiphase Reducing Required Input Capacitance and Power Supply Induced Noise
  • Two 5-Bit Desktop VID Codes: LTC1709-8 For VRM8.4 (VOUT from 1.3V to 3.5V) LTC1709-9 For VRM9.0 (VOUT from 1.1V to 1.85V)
  • Current Mode Control Ensures Best Current Sharing
  • True Remote Sensing Differential Amplifier
  • Power Good Output Indicator
  • OPTI-LOOP™ Compensation Minimizes COUT
  • Programmable Fixed Frequency: 150kHz to 300kHz
  • ±1% Output Voltage Accuracy
  • Wide VIN Range: 4V to 36V Operation
  • Adjustable Soft-Start Current Ramping
  • Internal Current Foldback and Short-Circuit Shutdown
  • Overvoltage Soft Latch Eliminates Nuisance Trips
  • Low Shutdown Current: 20µA
  • Available in 36-Lead Narrow SSOP Package
典型应用
LTC1709-9 Typical Application
应用
  • Workstations
  • Internet Servers
  • Large Memory Arrays
  • DC Power Distribution Systems
封装信息
LTC1709-9 Package Drawing
Order Information 订购型号
器件型号封装温度价格 (以 1 ~ 99 片为批量)价格 (以 1000 片为批量) *
LTC1709EG-9#PBFSSOP-36E$5.60$4.75
LTC1709EG-9#TRPBFSSOP-36E$4.85
演示电路板
器件型号描述价格
DC292B-CLTC1709EG-9 | High Current VRM 9.0 CPU Power Supply, 12Vin, 1.6Vout @ 45A, (mostly Surface Mount Caps)联系凌力尔特
DC311ALTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, Vin = 12V, Vout = 1.1V~1.8V @ 60A$250.00
数据表
设计要点
可靠性数据
LT Journal
CAD 符号
相关产品
The LTC1709-8/LTC1709-9 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators
Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors
R384 Reliability Data
May 2000 LTC1709 Low Cost, High Efficiency 42A Converters with VID Control Reduce Input and Output Capacitors
LTC1709-9 Footprints and Symbols