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A8296
Single LNB Supply and Control Voltage Regulator
Contact Allegro Marketing for datasheet.
Features
Integrated boost MOSFET, current sensing, and compensation•
Supplies up to 500 mA continuously•
Adjustable LNB output current limit from 300 to 500 mA•
Boost peak current limit scales with LNB current limit setting•
8 programmable LNB output voltage (DAC) levels•
LNB overcurrent limiter with shutdown timer•
Tracking boost converter minimizes power dissipation•
LNB transition times configurable by external capacitor•
Push-pull LNB output stage maintains 13→18 V and 8→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 features: PNG•
Extensive protection features: UVLO, OCP, TSD, CPOK•
2-wire I2C-compatible interface•
Description
Intended for analog and digital satellite receivers, this single 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 A8296 requires few external components, with the boost switch and
compensation circuitry integrated inside of the device.
The A8296 has been designed for high efficiency, utilizing the Allegro® 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.
Furthermore, design methodology and structure ensure the highest level of robustness against transients and component failures.
The device uses a 2-wire bidirectional serial interface, compatible with the I2C™ standard, that operates up to 400 kHz.
The A8296 is supplied in a lead (Pb) free package.
Functional Block Diagram
Part Number Package Type
RoHS
Compliant
Part Composition/
RoHS Data
Temperature Comments Samples/Demo Distributor Stock
A8296SESTR-T 16-lead QFN Yes view data -20 °C to 85 °C new Contact Local Sales Representative
or check distributor stock
All
Check Stock
Complete Part Numbers
Allegro's products are no
to be used in life support devices or systems, if a failure of an Allegro
roduct 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.
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ro
Product
A8296 Sin
le LNB Suppl
and Control Volta
e Re
ulato
10/4/2011htt
://www.alle
romicro.com/en/Products/Part
Numbers/8296
