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Intersil PWM controllers include high-current MOSFET drivers

Posted: 19 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:intersil? isl6310? isl6308? pwm controller? pulse width modulation controller?

Promise industry-leading system accuracyIntersil Corp. announced the two-phase ISL6310 and three-phase ISL6308 PWM (pulse width modulation) controllers with high-current, integrated MOSFET drivers and industry-leading system accuracy.

"By integrating the MOSFET driver with the PWM controller, Intersil reduces the number of external parts, providing the customer with cost and space savings in their power management designs," said George Lakkas, senior product marketing manager of Intersil's Power Management group. "These devices also feature differential remote voltage sensing for high system accuracy, and a 2-bit DAC that allows the designer to program the output voltage without the use of external resistors."

The output voltage of the ISL6310 and ISL6308 can be programmed using an on-chip DAC or an external precision reference, such as the ISL60002 series. A two-bit code programs the DAC reference to one of four possible values (0.6-, 0.9-, 12- or 1.5V). A unity-gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be offset through the use of a single external resistor.

The integrated MOSFET gate driver bias voltage of the ISL6310 and ISL6308 is programmable from 5V to 12V. According to Intersil, this allows the designer to achieve the optimum trade-off between the switching and conduction losses associated with the upper and lower MOSFETs. These devices also have the ability to power a pre-charged output without causing any output voltage disturbances, and can source and sink load current.

The two PWM controllers also feature an optional droop function that can be disabled for applications that have less stringent output voltage variation requirements or experience less severe step loads. A unique feature of these devices is the combined use of both DC resistance (DCR) and on-resistance (rDS(on)) current sensing. Using both methods of current sampling utilizes the best advantages of each technique, added the company.

Protection features of the new products include over-voltage (OV) and over-current (OC) protection. Both parts have a pre-POR (power-on reset) OVP (over-voltage protection) feature. Prior to the PVCC (power voltage pin for integrated drivers) and the VCC (voltage power pin for IC bias) exceeding their POR levels, the ISL6310 and ISL6308 are designed to protect the load from any over-voltage events that may occur. Whether the dc-dc converter has just turned on or is in normal operation, the lower MOSFET always turns on to stop the rising output voltage and protect the load until the OV event ceases or the input power supply cuts off. An OVP output is also provided to drive an optional crowbar device. The OC protection level is set through a single external resistor. Other protection features include protection against an open circuit on the remote sensing inputs. Combined, these features provide advanced protection for the output load.

The ISL6310 is available in a 32-lead QFN standard or Pb-free package and is priced at $1.80. The ISL6308 is housed in a 40-lead QFN standard or Pb-free package and is priced at $2.25. Both prices are for 1,000-unit quantities.

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