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A8293

Allegro MicroSystems
Part Number A8293
Manufacturer Allegro MicroSystems
Description Single LNB Supply and Control Voltage Regulator
Published May 11, 2014
Detailed Description A8293 Single LNB Supply and Control Voltage Regulator FEATURES AND BENEFITS ▪ 2-wire serial I2C™ -compatible interfac...
Datasheet PDF File A8293 PDF File

A8293
A8293

Overview
A8293 Single LNB Supply and Control Voltage Regulator FEATURES AND BENEFITS ▪ 2-wire serial I2C™ -compatible interface: control (write) and status (read) ▪ LNB voltages (8 programmable levels) compatible with all common standards including domestic Japan models ▪ Tracking switch-mode power converter for lowest dissipation ▪ Integrated converter switches and current sensing ▪ Provides up to 700 mA load current ▪ Static current limit circuit allows full current at startup and 13→18 V output transition; reliably starts wide load range ▪ Push-pull output stage minimizes 13→18 V and 18→13 V output transition times for highly capacitive loads ▪ Adjustable rise/fall time via external timing capacitor ▪ Built-in tone oscillator, factory-trimmed to 22 kHz facilitates DiSEqC™ tone encoding, even at no-load ▪ Four methods of 22 kHz tone generation, via I2C™ data bits and/or external pin ▪ Auxiliary modulation input ▪ LNB overcurrent with timer ▪ Diagnostics for output voltage level, input supply UVLO PACKAGES: 20-contact, 4 × 4 mm MLP/QFN (suffix ES) DESCRIPTION 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.
The A8293 has been designed for high efficiency, utilizing the Allegro™ advanced BCD process.
The integrated boost switch has been optimized to minimize both switching and static losses.
To further enhance efficiency, the voltage drop across the tracking regulator has been minimized.
For DiSEq...


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