ISL6422 Datasheet | Renesas

Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs FN9190 Rev 2.00 Aug 10, 2007 The ISL6422 is a highly integrated voltage regulator and interface IC, specifically designed for supplying power and control signals from advanced satellite set-top box (STB) modules to the low noise blocks (LNBs) of two antenna ports. The device is consists of two independent current-mode boost PWMs and two low-noise linear regulators along with the circuitry required for 22k Hz tone generation, modulation and I2C device interface. The device makes the total LNB supply design simple, efficient and pact with low external ponent count. Two independent current-mode boost converters provide the linear regulators with input voltages that are set to the final output voltages, plus typically 0.8V to insure minimum power dissipation across each linear regulator. This maintains constant voltage drops across each linear pass...