Crusoe™ Processor Core-Voltage Regulator

The ISL6211 is a single-output power-controller to power core of Transmeta’s Crusoe™ CPU. The ISL6211 includes a 5-bit digital-to-analog converter (DAC) that adjusts the core PWM output voltage from 0.6VDC to 1.75VDC. The DAC settings may be changed during operation. Special measures are taken to allow such a transition with controlled slew rate to comply with Transmeta’s LongRun™ technology. A precise reference and a proprietary architecture with integrated compensation provide excellent static and dynamic core voltage regulation.

Features
• High Efficiency Over Wide Load Range
• Loss-Less Current-Sense Scheme
    - Uses MOSFET’s RDS(ON)
    - Optional Current-Sense Resistor for Higher Tolerance Overcurrent Protection
• Powerful Gate Drivers with Adaptive Dead Time
• Summing Current-Mode Control and On-Chip Active Droop for Optimum Transient Response
• TTL-Compatible 5-Bit Digital Output Voltage Selection
    - Wide Range - 0.6VDC to 1.0VDC in 25mV Steps, and from 1.0VDC to 1.75VDC in 50mV Steps
    - “On-the-Fly” VID code change with customer programmable slew rate
• Alternative Input to Set Output Voltage During Start-up or Power Saving Modes
• Selectable Forced Continuous Conduction Mode of Operation
• Power-Good Output Voltage Monitor
• No Negative Core Voltage on Turn-off
• Over-Voltage, Under-Voltage and Over-Current Fault Monitors
• 300/600kHz Selectable Switching Frequency

Applications
• Mobile PCs
• Web Tablets
• Internet Appliances