A8293: Single LNB Supply and Control Voltage Regulator

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 A8293 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 A8293 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, several schemes are available for generating tone signals, all the way down to no-load, and using either the internal clock or an external time source.

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 A8293 is supplied in a lead (Pb) free MLP/QFN package: ES, 20-contact, 4 mm × 4 mm, 0.75 nominal overall height.

This part is in production but has been determined to be Pre-End-of-Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase.
Date of status change: March 6, 2017

Recommended Substitutions: Generation 4 and 5 devices. For existing customer transition, and for new customers or new applications, contact Allegro Sales.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
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  • 2-wire serial I²C™-compatible interface: control (write) and status (read)
  • LNB voltages (8 programmable levels) compatible with all common standards including domestic Japan models
  • Tracking switch-mode power converter for lowest dissipation
  • Integrated converter switches and current sensing
  • Provides up to 700 mA load current
  • Static current limit circuit allows full current at startup and 13→18 V output transition; reliably starts wide load range
  • Push-pull output stage minimizes 13→18 V and 18→13 V output transition times for highly capacitive loads
  • Adjustable rise/fall time via external timing capacitor
  • Built-in tone oscillator, factory-trimmed to 22 kHz facilitates DiSEqC™ tone encoding, even at no-load
  • Four methods of 22 kHz tone generation, via I²C™ data bits and/or external pin
  • Auxiliary modulation input
  • LNB overcurrent with timer
  • Diagnostics for output voltage level, input supply UVLO

The A8293 is supplied in a lead (Pb) free MLP/QFN package: ES, 20-contact, 4 mm × 4 mm, 0.75 nominal overall height.

ES QFN 20-lead

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Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8293SESTR-T 20-lead QFN -20°C to 85°C Yes View Data pre-EOL Contact your
local sales rep
Check Stock
A8293SETTR-T 28-lead QFN -20°C to 85°C Yes View Data pre-EOL Contact your
local sales rep
Check Stock
APEK8293SES-01-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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