High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers

The ISL6236 dual step-down, switch-mode power-supply (SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6236 include two pulse-width modulation (PWM) controllers, 5V/3.3V and
1.5V/1.05V. The output of SMPS1 can also be adjusted from 0.7V to 5.5V. The SMPS2 output can be adjusted from 0V to 2.5V by setting REFIN2 voltage.

FEATUREs
• Wide Input Voltage Range 5.5V to 25V
• Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or Adjustable 0.7V to 5.5V (SMPS1) and 0V to 2.5V(SMPS2), ±1.5% Accuracy
• Secondary Feedback Input (Maintains Charge Pump Voltage)
• 1.7ms Digital Soft-Start and Independent Shutdown
• Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V, ±1.5% (LDO): 200mA
• 3.3V Reference Voltage ±2.0%: 5mA
• 2.0V Reference Voltage ±1.0%: 50µA
• Constant ON-time Control with 100ns Load-Step Response
• Frequency Selectable
• rDS(ON) Current Sensing
• Programmable Current Limit with Foldback Capability
• Selectable PWM, Skip or Ultrasonic Mode
• BOOT Voltage Monitor with Automatic Refresh
• Independent POK1 and POK2 Comparators
• Soft-Start with Pre-Biased Output and Soft-Stop
• Independent ENABLE
• High Efficiency - up to 97%
• Very High Light Load Efficiency (Skip Mode)
• 5mW Quiescent Power Dissipation
• Thermal Shutdown
• Extremely Low Component Count
• Pb-Free (RoHS Compliant)

APPLICATIONs
• Notebook and Sub-Notebook Computers
• PDAs and Mobile Communication Devices
• 3-Cell and 4-Cell Li+ Battery-Powered Devices
• DDR1, DDR2 and DDR3 Power Supplies
• Graphic Cards
• Game Consoles
• Telecommunications