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Intersil Introduces Cost Effective, High Efficiency, Quad-Output Main Power Supply Controller for Notebook Computers

MILPITAS, CA – Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high performance analog solutions, today announced the release of the ISL6232, a 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 outputs. It also features 5V and 3.3V always linear regulators with up to 100mA 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 3.5mW.

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 25kHz 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 provides a number of features that minimize overall system implementation cost. First, the dual PWMs supply out-of-phase outputs so that input ripple current is reduced to a minimum. This allows smaller, lower cost input capacitors to be used. Second, external compensation allows optimization for most cost effective output capacitors and inductors. Finally, the dual LDOs support all ceramic capacitor designs, further minimizing cost.

The ISL6232 also features over-voltage protection, power-up sequences, power good output, and thermal shutdown. Additionally, over-current protection is provided by sensing the current either through the DCR of the inductor or more accurately using a current sense resistor. The peak current detection architecture avoids inductor saturation. Also, the device automatically shuts down when VOUT is less than 70 percent of the regulation voltage after 20ms. The internal soft-start feature is provided to control inrush current. The soft-stop feature avoids negative output voltage for under-voltage protection, over-current protection, and shutdown by discharging output through an internal switch, and by damping the inductor current.

ISL6232 Technical Summary

* Supply voltage range: 5.5V to 25V
* 3.3V and 5V fixed or adjustable outputs from 0.8V to 5.5V
* 5V, 3.3V/100mA always linear regulators
* Out-of-Phase operation reduces the ESR requirement of the input capacitors
* 1.5 percent output voltage accuracy over temperature
* Fixed 300kHz current mode control architecture
* Accurate current sensing or DCR current sensing
* Internal soft-start and soft-stop output discharge
* Selectable power-up sequence
* Selectable forced PWM, pulse skipping, and ultrasonic pulse skipping mode (25kHz min)
* Peak over current limit prevents inductor saturation
* Over-voltage protection, under voltage shutdown
* Power good output
* Thermal shutdown
* 5uA shutdown current
* Integrated bootstrap schottky diodes
* 3.5mW quiescent power dissipation

Lunes, 20 Junio, 2005 - 07:12
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