LTC1705

· 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: < 100mA
· Switchers Run Out-of-Phase to Minimize C_IN
· Small 28-Pin Narrow SSOP Package

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

Supply Voltage
V_CC, PV_CC, V_INCLK ....................................................... 6V
BOOSTC, BOOSTIO .................................................... 12V
BOOSTC SWC, BOOSTIO SWIO............................. 6V
Input Voltage
SWC, SWIO ...................................................... 1V to 6V
SENSEC, FBC, FBIO, VIDn ............... 0.3V to (V_CC + 0.3V)
PGOOD, RUN/SS,
I_MAXC, I_MAXIO ................................. 0.3V to (V_CC + 0.3V)
Peak Output Current <10ms
TGC, BGC ....................................................................... 5A
TGIO, BGIO ................................................................ 1.25A
Operating Temperature Range (Note 2) .. 40°C to 85°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................... 300°C

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. The LTC1705 uses a constant-frequency 550kHz PWM architecture, minimizing external component size and cost, as well as optimizing load transient performance. It provides better than 1.25% DC accuracy at its core output, and 2% at I/0 and CLK outputs. The high performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD flag indicates that all three outputs are within ±10% of their regulated values. A shutdown circuit disables all three outputs if the RUN/SS pin is pulled to  ground. In this mode, the LTC1705 supply current drops to below 100A.