DATASHEET
ISL6421A
Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set...
DATASHEET
ISL6421A
Single Output LNB Supply and Control Voltage
Regulator with I2C Interface for Advanced Satellite Set-top Box Designs
FN9167 Rev 3.00 Mar 9, 2006
CS FB COMP VSW NC SDA ADDR SCL
The ISL6421A is a highly integrated solution for providing power and control signals from advanced satellite set-top box (STB) modules to the low noise block (LNB). The internal architecture of this device contains a current-mode boost PWM and a low-noise linear
regulator, along with the circuitry required for I2C device interfacing and for providing DiSEqCâ„¢ standard control signals to the LNB.
A regulated output voltage is available at the output terminal (VOUT) to support the operation of the antenna port in advanced satellite STB applications. The regulated output may be set to either 13V or 18V by use of the voltage select command bit (VSEL) through the I2C bus. Additionally, to compensate for the voltage drop in the coaxial cable, the voltage may be increased by 1V with the line leng...