Product category: Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL6236
Edited by the Electronicstalk Editorial Team on 11 December 2006
Controller supports three
major power functions
Intersil has introduced a high-efficiency, multi-function quad output controller that reduces engineering resources by allowing designers to qualify one part for all three power functions
Intersil has introduced a high-efficiency, multi-function quad output controller that reduces engineering resources by allowing designers to qualify one part for all three power functions within the architecture of a notebook computer. The ISL6236 is the industry's only power supply controller that provides designers the flexibility to externally program the switchers and the LDO to different voltages to support either 3.3V to 5V system regulation, DDR (double data rate) memory or graphics processing.
This article was originally published on Electronicstalk on 11 December 2006 at 8.00am (UK)
Related stories
RS485/422 transceiver runs up to 100Mbit/s
Achieving a datarate more than double that of competing devices, the ISL3259E allows manufacturers to design the most dependable high datarate systems ever created
Multiple-output power chips save board space
Triple- and dual-output regulators provide a single, high-efficiency power solution for a variety of point-of-load applications
The ability to externally program the switchers and LDO allows for greater design flexibility.
Using one chip for all three power functions saves engineering time and costs associated with qualifying parts.
The ISL6236 has a wide input voltage range of 5.5V to 25V, and it utilises a constant on-time topology that eliminates the need for compensation, minimising external components and offering fast transient response.
Other features include pulse skip mode and ultrasonic pulse skip mode that provide high light-load efficiency and extended battery life.
Ultrasonic pulse-skipping maintains the switching frequency above 25kHz to eliminate noise in audio applications.
Further reading
Serial transmitter save power and protect
Low-voltage RS485/RS422 single transmitters come in very small TDFN and SOT23 packages
Serial receivers are well protected
Fully featured RS485/RS422 receivers provide 1/8 unit load input resistance and full fail-safe operation, along with enhanced ESD protection on the Rx input pins
Step-down controller claims widest input range
Dual-output buck controller runs from the industry's widest input voltage range, accepting inputs from 3.3 to 25V, and producing outputs from +0.6 to +5.0V
Intersil's ISL6236 is a dual step-down switch-mode power supply (SMPS) controller that generates logic supply voltages in battery-powered systems.
The device includes two adjustable PWM (pulse width modulation) controllers that can be configured to two fixed-output combinations: 5V/3.3V or 1.5V/1.05V.
The output of SMPS1 can also be adjusted from 0.7V to 5.5V, while the SMPS2 output can be adjusted from 0.5V to 2.5V by setting the REFIN2 voltage.
LDO output is either fixed 3.3V/5.0V or adjustable from 0.7V to 4.5V.
The fourth output of this quad controller is the voltage reference that can either be 3.3V or 2.0V.
A constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency.
The ISL6236 includes on-board power-up sequencing, power good (POK) outputs, digital soft start and internal soft stop output discharge that prevents negative voltages on shutdown.
The ISL6236 features secondary feedback input (maintains charge pump voltage), boot capacitor UV detection, 3.3V ref voltage +/-1.5%: 5mA, 2.0V ref voltage +/-1.0%: 50uA, frequency selectable, RDSON current sensing, and programmable current limit with foldback capability.
Other key features include temperature compensation for RSDON sensing, selectable PWM, skip or ultrasonic mode, independent POK1 and POK2 comparators, independent enable, high efficiency up to 97%, 5mW quiescent power dissipation, thermal shutdown, and an extremely low component count.
Target applications for the device include notebook and sub-notebook computers, PDAs and mobile communication devices, 3- and 4-cell Li+ battery-powered devices, DDR1, DDR2 and DDR3 power supplies, graphic cards, game consoles, and telecommunications.
The ISL6236 is available now in a 32-lead thin QFN package.
• Intersil: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
