A8285 and A8287: LNB Supply and Control Voltage Regulator

Description

These parts are discontinued.  Samples are no longer available. For new customers or new applications, please contact Allegro. Date of status change: December 2, 2013.

Intended for analog and digital satellite receivers, the LNB (low noise block) converter regulator is a monolithic linear and switching voltage regulator, specifically designed to provide power and interface signals to an LNB downconverter, via coaxial cable.

The device uses a 2-wire bidirectional serial interface, compatible with the I2C (Inter-C bus) standard, that operates up to 400 kHz.

The A8285 is supplied in a 16-lead plastic power SOIC with internally fused leads for thermal dissipation. The A8287 is supplied in a 24-lead plastic power SOIC with internally fused leads. Both devices are also available in lead (Pb) free versions, with 100% matte tine leadframe plating.

Top Features

  • LNB selection and standby function
  • Provides up to 500 mA load current
  • Two-wire serial I2C interface
  • Built-in tone oscillator, factory-trimmed to 22 kHz; facilitates
  • DiSEqC™ 2.0 encoding
  • Auxiliary modulation input
  • 22 kHz tone detector facilitates DiSEqC™ decoding (A8287 only)
  • Tracking switch-mode power converter for lowest dissipation
  • LNB overcurrent protection and diagnostics
  • Internal overtemperature protection
  • LNB voltages (16 possible levels) compatible with all common standards

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A8285SLBTR-T 16-lead SOIC -20°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check
Distributor Stock
A8287SLBTR-T 24-lead SOIC -20°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The A8285 is supplied in a 16-lead plastic power SOIC with internally fused leads for thermal dissipation. The A8287 is supplied in a 24-lead plastic power SOIC with internally fused leads. Both devices are also available in lead (Pb) free versions, with 100% matte tine leadframe plating.

LB-SOIC 24 pin