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Related Links:

Datasheets:
A8285 and A8287: LNB Supply and Control Voltage Regulator (PDF)

Selection Guides:
Power Management ICs,

Power Management ICs: LNB Regulators for Satellite STB Power

when this product is updated

Press Releases:
Allegro MicroSystems, Inc. Announces a Comprehensive Family of Voltage Regulation ICs for Satellite Receiver Applications - Power Management IC Family (A8281/8282/8285/8287)

A8285 and A8287
LNB Supply and Control Voltage Regulator

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

Description

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.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8285SLB	16-lead SOIC	No	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8285SLB-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8285SLBTR	16-lead SOIC	No	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8285SLBTR-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8287SLB	24-lead SOIC	No	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8287SLB-T	24-lead SOIC	Yes	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8287SLBTR	24-lead SOIC	No	view data	-20 °C to  85 °C	new	Contact Local Sales Representative
A8287SLBTR-T	24-lead SOIC	Yes	view data	-20 °C to  85 °C	new	Contact Local Sales Representative

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.