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Advanced Triple PWM Only Mode and Dual Linear Power Controller for Portable Applications

The ISL6235 provides a highly integrated power control and protection solution for five output voltages required in highperformance notebook PC applications. The IC integrates three fixed frequency pulse-width-modulation (PWM) controllers and two linear regulators along with monitoring and protection circuitry into a single 24 lead SSOP package.

Features

• PWM Only Mode for Reduced Noise at Light Loads

• Provides Five Regulated Voltages

    - +5V ALWAYS

    - +3.3V ALWAYS

    - +5V Main

    - +3.3V Main

    - +12V

• High Efficiency Over Wide Line and Load Range

    - Synchronous Buck Converters on Main Outputs

• No Current-Sense Resistor Required

    - Uses MOSFET’s rDS(ON)

    - Optional Current-Sense Resistor for More Precision

• Operates Directly From Battery 5.6 to 24V Input

• Input Undervoltage Lock-Out (UVLO)

• Excellent Dynamic Response

    - Voltage Feed-Forward and Current-Mode Control

• Monitors Output Voltages

• Synchronous Converters Operate Out of Phase

• Separate Shut-Down Pins for Advanced Configuration and Power Interface (ACPI) Compatibility

• 300kHz Fixed Switching Frequency on Main Outputs

• Thermal Shut-Down Protection

Applications

• Mobile PCs

• Hand-Held Portable Instruments

• LCD PCs

• Cable Modems

• DSL Modems

• Set Top Box