ISL6232

® ISL6232 Data Sheet April 18, 2005 FN9116.0 High Efficiency System Power Supply Controller for Notebook Computers The ISL6232 is a high efficiency, quad output controller optimized for converting battery, wall adapter or network DC input voltage into system supply voltages required for portable applications. The ISL6232 includes two PWM controllers generating 0.8V to 5.5V, or fixed 5V and 3.3V outputs. It also features 5V and 3.3V always linear regulators with up to 100mA output current. ISL6232 uses constant frequency current mode PWM control with out of phase operation for reducing the input ripple current and the ESR requirement of the input capacitors. Over 95% efficiency is achieved through synchronous rectification and dual PWM/Skip mode architecture. High light load efficiency with skip mode extends the battery life in system standby or shutdown mode. The 5V and 3.3V always linear regulators take their inputs from battery or ac adapter; and, to further improve efficiency, their outputs are switched to the 5V or 3.3V outputs from switching regulators when 5V or 3.3V is available. Ultrasonic pulse skipping mode maintains switching frequency above 25kHz to eliminate the audio noise for high light load efficiency, and fixed frequency PWM operation mode reduces the RF interference in sensitive applications. External loop compensation is used to optimize the transient response with optimized external components. An accurate current sensing resistor in series with an outpu...