A8297SETTR-T

A8297SETTR-T Datasheet

Allegro | Product | A8297 Dual LNB Supply and Control Voltage Regulator

Part	Datasheet
A8297SETTR-T	A8297SETTR-T (pdf)

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Allegro \| Product \| A8297 Dual LNB Supply and Control Voltage Regulator Home / Products / Part Numbers / A8297 A8297 Dual LNB Supply and Control Voltage Regulator Contact Allegro Marketing for datasheet. • Integrated boost MOSFET, current sensing, and compensation • Supplies up to 550 mA per channel, continuously • Supplies up to 700 mA per channel, for reconfiguration • Supplies up to 950 mA total from both channels, continuously • Supplies up to 1100 mA total from both channels, for reconfiguration • Adjustable LNB output current limit form 300 to 800 mA • Boost peak current limit scales with LNB current limit setting • 8 programmable LNB output voltage DAC levels • LNB overcurrent limiter with shutdown timer • Static LNB current limit reliability starts a wide range of loads • Tracking boost converter minimizes power dissipation • LNB transition times programmable by external capacitor • Push-pull LNB putput stage maintains 13-to-18 V and 18-to-13 V transition times, even with highly capacitive loads • Built-in 22 kHz tone oscillator facilitates DiSEqC tone encoding, even at no-load • Tone generation does not require additional external components • Diagnostic tone detect amplitude and frequency transmit/receive thresholds • Extensive protection features UVLO, OCP, TSD, and CPOK • RESET input disables the LNB and resets control registers to the 0 state for fast load shedding 2-wire I2C -compatible interface • Small low-profile 5 mm x 5 mm, mm QFN-28 package Intended for analog and digital satellite receivers, this dual 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 A8297 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 A8297 has been designed for high efficiency, utilizing the 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 DiSEqC communications, a tone control pin is provided to gate the internally-generated 22 kHz tone on-and-off. A comprehensive set of fault registers are provided, which comply with all the common standards, including overcurrent, thermal shutdown, undervoltage, and power not good. The device uses a 2-wire bidirectional serial interface, compatible with the I2C standard, that operates up to 400 kHz. The A8297 is supplied in a lead Pb free package. Functional Block Diagram Complete Part Numbers Package Type RoHS Part Composition/ Compliant RoHS Data Temperature Comments Samples/Demo A8297SETTR-T 28-lead QFN view data -20 °C to 85 °C new Contact Local Sales Representative or check distributor stock APEK8297SES-01-T DEMO BOARD No -20 °C to 85 °C new Contact Local Sales Representative Distributor Stock Check Stock 10/4/2011 Allegro \| Product \| A8297 Dual LNB Supply and Control Voltage Regulator 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. Copyright 2011 Allegro MicroSystems, Inc. • 115 Northeast Cutoff, Worcester, MA 01606 USA • Phone • Fax: 10/4/2011

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Allegro | Product | A8297 Dual LNB Supply and Control Voltage Regulator

Home / Products / Part Numbers / A8297

A8297 Dual LNB Supply and Control Voltage Regulator

Contact Allegro Marketing for datasheet.
• Integrated boost MOSFET, current sensing, and compensation
• Supplies up to 550 mA per channel, continuously
• Supplies up to 700 mA per channel, for reconfiguration
• Supplies up to 950 mA total from both channels, continuously
• Supplies up to 1100 mA total from both channels, for reconfiguration
• Adjustable LNB output current limit form 300 to 800 mA
• Boost peak current limit scales with LNB current limit setting
• 8 programmable LNB output voltage DAC levels
• LNB overcurrent limiter with shutdown timer
• Static LNB current limit reliability starts a wide range of loads
• Tracking boost converter minimizes power dissipation
• LNB transition times programmable by external capacitor
• Push-pull LNB putput stage maintains 13-to-18 V and 18-to-13 V transition times, even with highly capacitive loads
• Built-in 22 kHz tone oscillator facilitates DiSEqC tone encoding, even at no-load
• Tone generation does not require additional external components
• Diagnostic tone detect amplitude and frequency transmit/receive thresholds
• Extensive protection features UVLO, OCP, TSD, and CPOK
• RESET input disables the LNB and resets control registers to the 0 state for fast load shedding 2-wire I2C -compatible interface
• Small low-profile 5 mm x 5 mm, mm QFN-28 package

Intended for analog and digital satellite receivers, this dual 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 A8297 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 A8297 has been designed for high efficiency, utilizing the 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 DiSEqC communications, a tone control pin is provided to gate the internally-generated 22 kHz tone on-and-off.

A comprehensive set of fault registers are provided, which comply with all the common standards, including overcurrent, thermal shutdown, undervoltage, and power not good.

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

The A8297 is supplied in a lead Pb free package.

Functional Block Diagram

Complete Part Numbers

Package Type

RoHS Part Composition/ Compliant RoHS Data

Temperature

Comments

Samples/Demo

A8297SETTR-T
28-lead QFN
view data
-20 °C to 85 °C new

Contact Local Sales Representative or check distributor stock

APEK8297SES-01-T DEMO BOARD No
-20 °C to 85 °C new Contact Local Sales Representative

Distributor Stock

Check Stock
10/4/2011

Allegro | Product | A8297 Dual LNB Supply and Control Voltage Regulator

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.

Copyright 2011 Allegro MicroSystems, Inc.
• 115 Northeast Cutoff, Worcester, MA 01606 USA
• Phone
• Fax:
10/4/2011

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived A8297SETTR-T Datasheet file may be downloaded here without warranties.

Datasheet ID: A8297SETTR-T 516070