Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL6232
Edited by the Electronicstalk Editorial
Team on 22 July 2005
PSU controller combines two PWMs with
dual LDOs
A high-efficiency quad-output system power supply controller is optimised for converting battery, wall adapter or network DC input voltages into system supply voltages required by notebook computers.
Available now from Intersil, the ISL6232 is a high-efficiency quad-output system power supply controller that is optimised for converting battery, wall adapter or network DC input voltages into system supply voltages required by notebook computers and other portable applications The ISL6232 includes a number of features that minimise overall system implementation cost
This article was originally published on Electronicstalk on 6 Oct 2008 at 8.00am (UK)
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First, the device includes two PWM controllers generating 0.8 to 5.5V outputs.
These dual PWMs supply out-of-phase outputs so that input ripple current is reduced to a minimum and they also address the ESR requirements of the input capacitors.
This allows smaller, lower cost input capacitors to be used.
Secondly, external compensation allows optimisation for most cost effective output capacitors and inductors.
Finally, the dual LDOs support all ceramic capacitor designs, further minimising cost.
The ISL6232 features 5 and 3.3V always-linear regulators with up to 100mA output current, and it has a quiescent power dissipation as low as 3.5mW.
Over 95% maximum efficiency is achieved through synchronous rectification and the device's 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 also features overvoltage protection, power-up sequences, power good output, and thermal shutdown.
Additionally, overcurrent 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.
The device automatically shuts down when output voltage is less than 70% of the regulation voltage after 20ms.
The device's internal soft-start feature is provided to control inrush current.
The soft-stop feature avoids negative output voltage for undervoltage protection, overcurrent protection and shutdown by discharging output through an internal switch, and by damping the inductor current.
Intersil's ISL6232 is available now in a 28-lead, lead-free annealed (RoHS compliant) QSOP package with the part ordering number of ISL6232CAZA.
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