Allegro MicroSystems adds to its extensive portfolio of low noise block regulators (LNBRs) designed for satellite receivers in Set Top Boxes and LCD TVs. Allegro’s “Generation 5” A8300 and A8300-1 are fully integrated linear and switching voltage regulators that are specifically designed to provide the power and the interface signals to an LNB down-converter via coaxial cable.
The A8300 is optimized for low-profile ceramic boost capacitors, while the A8300-1 is designed for use with lower cost electrolytic capacitors. For DiSEqC™ communication the ICs provide an internal 22-kHz tone that is gated with a control pin, or can accept an external 22-kHz through this same pin. In addition, these devices have integrated tone detection capability for full two-way DiSEqC™ communications, as well as an integrated gate drive for the filter bypass FET.
A “sleep” pin is available to maximize power savings and to quickly shut down the device if needed, without using I²C™ control. The devices also offer an Early Power Failure (EPF) function, which helps to verify the status of the 12 V rail as well as initiate shutdown routines. The I²C™- compatible interface provides control capabilities for complex system requirements, as well as diagnostic capabilities for system fault reporting.
Allegro’s A8300SESTR-T and A8300SESTR-1-T are supplied in a 4 mm × 4 mm, 24-contact, lead-free (Pb), QFN package (suffix ES), with 100% matte tin plated leadframe.
