LTC1709IG DESCRIPTION
The LTC 1709-8/LTC1709-9 are 2-phaseVID program mable. synchronous step-down switching regulator controllers that drivetwoall N-channelexternalpowerMOSFET stages in a fixed frequencyarchitecture.The2-phase controller drives its two output stages out of phase at frequencies from 150kH7to300kHzto minimizethe ripple currents in both inputand outputcapacitors.The2- phase technique effectively multiplies the fundamental frequency by two.improving transient response while operating each channel at an optimum frequencyfor efficiency.Thermal design is also simplified.
LTC1709IG FEATURES
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 (Voufrom 1.3V to3.5V) LTC1709-9 For VRM9.0 (Voufrom 1.1V to1.85V Current Mode Control Ensures Best Current Sharing True Remote Sensing Differential Amplifier Power Good Output Indicator
OPTI-LOOP Compensation Minimizes Cou
Programmable Fixed Frequency:150kHz to 300kHz+1% Output Voltage Accuracy
Wide VRange: 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:20uA
Available in 36-Lead Narrow SSOP Package
LTC1709IG APPLICATIONS
Workstations Internet Servers
Large Memory Arrays
DC Power Distribution Systems
