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High-Performance Power ICs and Hall-Effect Sensors
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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
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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
| 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 | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8285SLB-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8285SLBTR | 16-lead SOIC | No | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8285SLBTR-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8287SLB | 24-lead SOIC | No | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8287SLB-T | 24-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8287SLBTR | 24-lead SOIC | No | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. | |
| A8287SLBTR-T | 24-lead SOIC | Yes | view data | -20 °C to 85 °C | new | Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor. |
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.