特点
Fully Compliant with Intel 5-Bit Mobile (LTC1699-80) and Desktop VRM8.4 (LTC1699-81) and VRM9.0 (LTC1699-82) VID Specificatio
Precision ±0.35% Programmable Resistor Divider for Use with 0.8V Referenced DC/DC Converters
Two Different Divider Settings Can Be Stored Using a 2-Wire SMBus Serial Interface (Rev 1.1)
Built-In Safeguards Minimize Misprogramming Due to Bus Conflicts
Three Open-Drain Pins (CPU_ON, IO_ON, CLK_ON) and a Global Control Pin (VRON) to Shutdown or Soft-Start 3 DC/DC Converters Simul
PGOOD Pin and 50μs PGOOD Timer
Available in MSOP-8 and SSOP-16 Package
典型应用
描述
The SMBus interface uses Write Word protocol to setup the registers and to turn the DC/DC converters on or off. Read Word protocol is used to verify register contents and to return the On/Off status of the converters. The LTC1699-80, LTC1699-81 and LTC1699-82 incorporate safeguards against errors due to bus conflicts.
Three open-drain N-channel outputs (CPU_ON, IO_ON and CLK_ON) are provided to turn DC/DC converter supplies on or off via their RUB/SS inputs. A global control pin, VRON is used to turn the converters on or off simultaneously. An internal timer pulls the PGOOD pin low for 50μs if the divider setting changes or the converters are turned on via the SMBus and the VRON pin.