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