Control-voltage regulators/interface ICs simplify total LNB supply design

Milpitas, Calif. — These LNB control voltage regulators and interface ICs from Intersil Corp. offer high integration, power efficiency and reliability to ensure long service in customer premise equipment.

These devices provide power and control signals from advanced set-top box (STB) units to the satellite dish low-noise block (LNB) down converter.

The ISL6424 is specifically designed for supplying power and control signals from advanced STB modules to the LNBs of two antenna ports, while the ISL6425 performs the same functions as the ISL6424, but for the LNB of only one antenna port. Both devices are designed for compliance with 2.5 V/3.3 V logic and are pin compatible with Intersil's current device offerings.

The ISL6424 is comprised of two independent current mode boost pulse-width modulation (PWMs), and two low-noise linear regulators, along with the circuitry required for 22 kHz tone generation, modulation and I²C device interface. Both supply and control voltage outputs for two low-noise LNBs are available simultaneously in any output configuration. Each output channel is capable of providing 750 mA of continuous current and the over-current limit can be digitally programmed. The device allows the 13 V to 18 V transition with an external pin, overriding the I²C input. To protect against overheating, the step-up converter and the linear regulator are shut off when the junction temperature exceeds 150°C (typical). Normal operation is resumed when the junction is cooled down to 135°C (typical).

“With the introduction of these new controllers, Intersil makes the total LNB supply design simple, efficient and compact with low external component count,” said Tommy Sokola, senior marketing manager for Intersil's general purpose power products.

The ISL6424 and the ISL6425 are available now in standard lead finish and Pb-free, in a 5mm x 5mm, 32-lead QFN package. The ISL6424 is also available in a 28-lead EPSOIC package.

The suggested price in 10,000 unit quantities is $2.25 for each ISL6424 IC and $1.15 per IC for the ISL6425.Click here for the ISL624 and ISL625 data sheets.

Intersil , 1-888-468-3774,

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