DATASHEET
ISL6423B
Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set...
DATASHEET
ISL6423B
Single Output LNB Supply and Control Voltage
Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs
FN6412 Rev 1.00 Apr 10, 2007
The ISL6423B 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 singe antenna ports. The device consists of a current-mode boost PWM and a low-noise linear
regulator 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.
The current-mode boost converters provides the linear
regulator with input voltage that is set to the final output voltages, plus typically 0.8V to insure minimum power dissipation across each linear
regulator. This maintains constant voltage drop across the linear pass element while permitting adequate...