A8293

Product Summary

The A8293 is a Single LNB Supply and Control Voltage Regulator. Intended for analog and digital satellite receivers, this single low noise block converter regulator (LNBR) is a monolithic linear and switching voltage regulator, specifically designed to provide the power and the interface signals to an LNB down converter via coaxial cable. The A8293 requires few external components, with the boost switch and compensation circuitry integrated inside of the device. A high switching frequency is chosen to minimize the size of the passive filtering components, further assisting in cost reduction. The high levels of component integration ensure extremely low noise and ripple figures.

Parametrics

A8293 absolute maximum ratings: (1)Load Supply Voltage, VIN pin, VIN: 30 V; (2)Output Current1 IOUT: Internally Limited A; (3)Output Voltage, BOOST pin: -0.3 to 33 V; (4)Output Voltage, LNB pin Surge2: -1 to 33 V; (5)Output Voltage, LX pin: -0.3 to 30 V; (6)Output Voltage, VCP pin, VCP: -0.3 to 41 V; (7)Logic Input Voltage, EXTM pin: -0.3 to 5 V; (8)Logic Input Voltage, other pins: -0.3 to 7 V; (9)Logic Output Voltage: -0.3 to 7 V; (10)Operating Ambient Temperature, TA: -20 to 85℃; (11)Junction Temperature, TJ(max): 150℃; (12)Storage Temperature, Tstg: -55 to 150℃.

Features

A8293 features: (1)2-wire serial I2C-compatible interface: control (write) and status (read); (2)LNB voltages (8 programmable levels) compatible with all common standards including domestic Japan models; (3)Tracking switch-mode power converter for lowest dissipation; (4)Integrated converter switches and current sensing; (5)Provides up to 700 mA load current; (6)Static current limit circuit allows full current at startup and; (7)13-18 V output transition; reliably starts wide load range; (8)Push-pull output stage minimizes 13-18 V and 18-13 V output transition times for highly capacitive loads; (9)Adjustable rise/fall time via external timing capacitor; (10)Built-in tone oscillator, factory-trimmed to 22 kHz facilitates DiSEqC tone encoding, even at no-load; (11)Four methods of 22 kHz tone generation, via I2C data bits and/or external pin; (12)Auxiliary modulation input; (13)LNB overcurrent with timer; (14)Diagnostics for output voltage level, input supply UVLO.

Diagrams