Single Output LNB Supply And Control Voltage Regulator With I2C Interface For Advanced Satellite Set-Top Box Designs, DiSEqC 2.0 Compatible

The ISL6423 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 single 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 converter 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 the linear Regulator This maintains constant voltage drop across the linear pass element while permitting adequate voltage range for Tone injection.
The final regulated output voltage is available at output terminals to support the operation of an Antenna port for single Tuners The outputs for each PWM CAN be controlled in two ways, full control from I2C using the VTOP and VBOT bits or set the I2C to the lower range (i.e., 13.3V/14.3V) and Switch to higher range (i.e., 18.3V/19.3V) with the SELVTOP pin. All the functions on this IC are controlled via the I2C bus by writing 8 bits words onto the System Registers (SR). The same Register CAN be read back, and five I2C bits will report the diagnostic status. Separate enable command sent on the I2C bus provides for standby mode control for the PWM and linear combination, disabling the output and forcing a shutdown mode. The output channel is capable of providing 750mA of continuous current. The overcurrent limit CAN be digitally programmed to four levels.
The External modulation input EXTM CAN accept a modulated DiSEqC command and transfer it symmetrically to the output. Alternatively the EXTM pin CAN be used to modulate the continuous internal Tone
The FLT pin serves as an interrupt for the processor when an over temperature fault condition is detected by the LNB controller. The nature of the fault CAN be read of the I2C Registers
By Intersil Corporation
ISL6423 's PackagesISL6423 's pdf datasheet

ISL6423 Pinout, Pinouts
ISL6423 pinout,Pin out
This is one package pinout of ISL6423,If you need more pinouts please download ISL6423's pdf datasheet.

ISL6423 Application circuits
ISL6423 circuits
This is one application circuit of ISL6423,If you need more circuits,please download ISL6423's pdf datasheet.

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