ISL6226

• Provides Two Regulated Voltages
  - Linear Regulator, User Selected, Current Limited
  - High Efficiency PWM Over Wide Line and Load Range
  - Synchronous Buck Converter on PWM Output
  - Hysteretic Operation at Light Load
• Dual Mode Operation:
  - Directly From Battery Input, V_IN, of 5.6V to 24V or from V_CC of 5V
• PWM Output Adjustable From 0.9V to 0.93*V_IN
• Low Drop-Out (LDO) Linear Regulator Operates from Vout+0.5V to 24V
• LDO Output Adjustable
  - From 0.8V to 3.8V at 0A to 3A for NPN Transistor
  - From 0.8V to 3.0V at 0A to 3A for N-MOSFET
• 300/600kHz Switching Frequency Selectable
• Forced PWM Mode Control Option
• No Current-Sense Resistor Required on PWM Output
  - Uses MOSFET's r_DS(ON)
  - Optional Current-Sense Resistor for More Precision
• Separate Soft-Start For Both PWM and LDO
• Separate Enable Pins for both PWM and LDO for Advanced Configuration and Power Interface (ACPI) Compatibility
• Input Under voltage Lock-Out (UVLO) Protection
• Excellent Dynamic Response
  - Input Voltage Feed-Forward and Current-Mode Control
• Monitors Output Voltages and Provides PGOOD Status
• Thermal Shut-Down Protection

The ISL6226 provides power control and protection for two user selected output voltages required in high-performance notebook PC applications. The IC integrates ISL6226 a fixed,selectable frequency pulse-width-modulation (PWM)controller and a 3A LDO linear regulator controller with monitoring and protection circuitry in a single 24 lead SSOP package.

The PWM controller ISL6226 regulates the battery input voltage to a user selected output voltage. Synchronous converter and hysteretic ISL6226 operation at light loads contribute to a high efficiency over a wide range of input voltage and load variation. Efficiency can be further enhanced by using the lower MOSFET's rDS(ON) as the current sense element.Input voltage feed-forward ramp modulation, current-mode control,and internal feed-back compensation provide fast and stable handling of input voltage load transients encountered in advanced portable computer chip sets.

The internal linear regulator controller ISL6226 provides a user selected high current output from an unregulated input with user selected current limit.