Renesas Electronics Corporation Highly Integrated Single Output LNB Regulator with I2C Interface for Satellite Set-Top Box Designs ISL9492ERZ

The ISL9492 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 (LNB) of a single antenna port. It also supports DiSEqC tone generation and modulation with diagnostic status read-back. Controlling the ISL9492 is simple via the Isup2/supC bus by writing 8 bit words onto the System Registers (SR).brbr The device design makes the total LNB supply design simple, efficient and compact with low external component count by integrating Boost power MOSFET, current-mode boost PWM and a low-noise linear regulator. The current-mode boost converters provide the linear regulator with input voltage that is set to the final output voltages, plus typically 0.9V to insure minimum power dissipation across each linear regulator.brbr The LNB output voltage can be controlled in two ways; by full control from Isup2/supC using the VTOP and VBOT bits or by setting the Isup2/supC to the lower range and switching to higher range with the select VTOP pin.brbr The External modulation input EXTM accepts a modulated DISEqC command and transfers it symmetrically to the output. The EXTM pin can be used to modulate the continuous internal tone. The fault signal serves as an interrupt for the processor when any condition turns OFF the LNB controller (over-temperature, overcurrent, disable). The states of these flags to the faults can be thoroughly examined through the Isup2/supC registers.

IC REG SGL LNB CONTROL 28TQFN

Switching Voltage Regulators SING OUTPUT LNB SUPP VAGEG FOR SATELLITE

IC REG CONV SATELLIT 1OUT 28TQFN