DESCRIPTION
The LTC®1705 is a complete power supply controller for Intel Mobile Pentium processors. It includes two switching regulator controllers, each designed to drive a pair of N-channel MOSFETs in a voltage mode feedback, synchronous buck configuration, to provide the core and I/O supplies. The core controller includes a 5-bit DAC that conforms to the Intel Mobile VID specification. The IC also includes a low dropout linear regulator (LDO) that delivers up to 150mA of output current to provide the CLK supply.

FEATURES
■ Three Regulated Outputs: Core, I/O and CLK in One
   Package
■ Integrated Intel Mobile 5-Bit VID DAC
■ No External Current Sense Resistors
■ All N-Channel External MOSFET Architecture
■ 550kHz Switching Frequency Minimizes External
   Component Size and Cost
■ Integrated 150mA LDO Linear Regulator
■ Excellent DC Accuracy: 1.25% for Core, 2% for I/O
   and CLK Supplies
■ PGOOD Flag Monitors All Three Outputs
■ High Efficiency Over Wide Load Current Range
■ Low Shutdown Current: < 100µA
■ Switchers Run Out-of-Phase to Minimize CIN
■ Small 28-Pin Narrow SSOP Package

APPLICATIONS
■ Complete Power Supply Controller for Intel
   Mobile Pentium® Processors
■ Intel Mobile Pentium Core, I/O, Clock Supplies
■ Multiple Logic Supply Generator