DATASHEET
ISL6422
Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-To...
DATASHEET
ISL6422
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 22kHz tone generation, modulation and I2C device interface. The device makes the total LNB supply design simple, efficient and compact with low external component 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 el...