ISL6405 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 comprised 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.
The ISL6405 is a highly integrated voltage regulator and interface IC 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 comprises two independent current-mode boost PWMs and two low-noise linear regulators, along with circuitry for 22kHz tone generation, modulation, and I2C device interface. It simplifies LNB supply design by reducing the external component count while maintaining efficiency and compactness.
| Operating Supply Voltage Range | 8V to 14V |
|---|---|
| Maximum Junction Temperature | 150°C |
| Output Voltage (13V setting) | 12.74V to 13.26V |
| Output Voltage (18V setting) | 17.64V to 18.36V |
| Continuous Current per Output | 750mA |
| Boost PWM Efficiency | > 92% |
| Tone Frequency | 22kHz |
It is 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 outputs for each PWM are set to 13V or 18V by independent voltage select commands (VSEL1, VSEL2) through the I2C bus.
The maximum junction temperature is 150°C, and the thermal shut-down circuitry turns off the device if this limit is exceeded.