Allegro | Product | A8295 Single LNB Supply and Control Voltage Regulator
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A8295
Single LNB Supply and Control Voltage Regulator
Contact Allegro Marketing for datasheet.
Features
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Integrated boost MOSFET, current sensing, and compensation
Supplies up to 550 mA continuously
Supplies up to 700 mA for reconfiguration
Adjustable LNB output current limit from 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
Tracking boost converter minimizes power dissipation
LNB transition times configurable by external capacitor
Push-pull LNB output stage maintains 13→18 V and
18→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, TDET
Dynamic tone detect amplitude and frequency transmit/receive thresholds
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 A8295 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 A8295 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.
The device uses a 2-wire bidirectional serial interface, compatible with the I2C™ standard, that operates up to 400 kHz.
The A8295 is supplied in a lead (Pb) free package.
Functional Block Diagram
Complete Part Numbers
Part Number
A8295SESTR-T
RoHS Part Composition/
Package Type
Temperature Comments
Compliant
RoHS Data
20-lead QFN
APEK8295SES-01-T DEMO BOARD
Samples/Demo
Yes
view data
-20 °C to 85 °C
new
Contact Local Sales Representative
or check distributor stock
No
--
-20 °C to 85 °C
new
Contact Local Sales Representative
http://www.allegromicro.com/en/Products/Part_Numbers/8295/
Distributor Stock
All
Check Stock
10/4/2011
Allegro | Product | A8295 Single LNB Supply and Control Voltage Regulator
Page 2 of 2
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: 1.508.853.5000 • Fax: 1.508.853.7895
http://www.allegromicro.com/en/Products/Part_Numbers/8295/
10/4/2011
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