Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

The ISL6422B 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.

Features
• Single Chip Power Solution
    - True Dual Operation for 2-Tuner/2-Dish Applications
    - Both Outputs May be Enabled Simultaneously at Maximum Power
    - Integrated DC/DC Converter and I2C Interface
• Switch-Mode Power Converter for Lowest Dissipation
    - Boost PWMs with >92% Efficiency
    - Selectable 13.3V or 18.3V Outputs
    - Digital Cable Length Compensation (1V)
    - I2C and Pin Controllable Output
• Output Back Bias Capability of 28V
• I2C Compatible Interface for Remote Device Control
• Four level Slave Address 0001 00XX
• 2.5V/3.3V/5V Logic Compatible
• External Pins to Toggle Between V and H Polarization
• Built-In Tone Oscillator Factory Trimmed to 22kHz
    - Facilitates DiSEqC (EUTELSAT) Encoding
    - External Modulation Input
• Internal Over-Temperature Protection and Diagnostics
• Internal OV, UV, Overload and Overtemp Flags (Visible on I2C)
• FLT Signal
• LNB Short-Circuit Protection and Diagnostics
• QFN and EPTSSOP Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• LNB Power Supply and Control for Satellite Set-Top Box