Intersil Announces ISL6232 Power Supply Controller
Intersil Corp. (Milpitas, CA) announced its high-efficiency, quad-output ISL6232 power supply controller for notebook computers, which is optimized for converting battery, wall adapter, or network dc-input voltage into system supply voltages required for portable applications. The ISL6232 includes two pulse-width modulated (PWM) controllers generating 0.8 V to 5.5 V outputs. It also features 5 V and 3.3 V linear regulators with up to 100 mA output current.
The ISL6232 uses constant-frequency, current-mode PWM control with out-of-phase operation for reducing the input ripple current and addressing the ESR requirement of the input capacitors. It has quiescent power dissipation as low as 3.5 mW. Over 95 percent maximum efficiency is achieved through synchronous rectification and its dual PWM/skip-mode architecture. The ISL6232's programmable high-light load efficiency extends the battery life in system standby or shutdown mode. The device's ultrasonic pulse-skipping mode maintains switching frequency above 25 kHz to eliminate the audio noise, enabling high-light load efficiency, and fixed-frequency PWM operation mode reduces the RF interference in sensitive applications.
The ISL6232 also features over-voltage protection, power-up sequences, power-good output, and thermal shutdown.
