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A8285SLB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A8285SLB Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 17 page A8285/A8287 LNB Supply and Control Voltage Regulator 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. 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 Use the following complete part numbers when ordering: ABSOLUTE MAXIMUM RATINGS 8 ADD 4 GND 7 EXTM 3 IRQ 6 VIN 2 SDA 5 VREG 9 NC 13 GND 10 TCAP 14 LX 11 TOUT 15 BOOST 12 LNB 16 VCP 1 SCL A8287SlB SOIC Part Number Pb-free Package Description A8285SLB – 16-pin SOIC Tone detect not provided A8285SLB-T Yes 16-pin SOIC Tone detect not provided A8287SLB – 24-pin SOIC All features A8287SLB-T Yes 24-pin SOIC All features Load Supply Voltage, V IN....................................16 V Output Current, I OUT ..................Internally Limited* Output Voltage LNB, BOOST .....................–0.3 V to 28 V TOUT ................................. –0.3 V to 22 V Logic Input EXTM ...................................–0.3 V to 5 V Other .................................... –0.3 V to 7 V Logic Output ........................................ –0.3 V to 7 V Package Power Dissipation ………..See power dissi- pation information in theApplication Information section Operating Temperature Ambient, T A....................... –20°C to +85°C Junction, T J....................... –20°C to +150°C Storage,T S ....................... –55°C to +150°C * Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of +150°C. 13 TDI 14 NC TCAP 15 16 TOUT 17 LNB 21 GND 18 GND 22 GND 19 GND 23 BOOST 20 LX 24 VCP 12 TDO 11 ADD 10 EXTM 9 VIN 8 VREG 4 GND 7 GND 3 IRQ 6 GND 2 SDA 5 GND 1 SCL A8285SlB SOIC FEATURES Scale 1:1 Scale 1:1 |
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