A8302: Dual LNB Supply and Control Voltage Regulators

The A8302 is a dual channel low noise block converter regulator (LNBR). The A8302 consists of 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 in satellite TV receivers systems. The A8302 requires few external components, with the boost switch and compensation circuitry integrated inside of the device. The boost converter switching frequency and user-controlled current limit minimize the size of the passive filtering components. User controlled current limit and two switching frequency settings allow to optimize size of passive filtering components. A sleep pin is available to maximize power savings and to quickly shut down the device if needed, without using I2C™ control.

The A8302 has integrated tone detection capability and the internal driver allows full two-way DiSEqC™ communications. For DiSEqC™ communication, the IC provides an internal 22-kHz tone that is gated with the TONECTRLx pin or accepts an external 22-kHz tone through the TONECTRLx pin.

The A8302 offers Early Power Failure (EPF) warning, which helps to initiate shutdown routines. The A8302 maximum output reverse current can be set using the SINK_DIS bit.

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 A8302 is supplied in a 5 mm × 5 mm, 32-contact, lead (Pb) free QFN package (suffix ET), with 100% matte tin plated leadframe.


Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
700 Veterans Memorial Hwy
Suite 310
Hauppauge, NY 11788
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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  • Integrated boost MOSFET, current sensing, and compensation
  • Configurable boost capacitor option through I2C™ control register: ceramic or electrolytic
  • Two switching frequency settings programmable through I2C™ control register (563 kHz and 939 kHz)
  • Adjustable LNB output current limit from 250 to 950 mA
    • Covers a wide array of application requirements
    • Minimizes component sizing to fit each application
    • For startup, reconfiguration, and continuous output
    • Optional temporary increased current limit (+25%)
    • Internal gate drive output BFGATEx for bypass FET used in DiSEqC™ applications
  • Boost peak current limit scales with LNB current limit setting
  • Early Power Failure (EPF) warning
  • SINK_DIS bit to control maximum output reverse current
  • 8 programmable LNB output voltage (DAC) levels
  • LNB overcurrent limit protection and TSD with autorestart or latched
  • LNB transition times configurable by external capacitor
  • Built-in 22-kHz tone oscillator facilitates DiSEqC™ tone encoding
    • Tone generation does not require additional external components
  • Diagnostic features: PNGx,TDETx, BOOSTxH and EPF
  • Dynamic tone detect amplitude and frequency transmit/receive thresholds
  • Extensive protection features: UVLO, TSD, OCPx, and CPOKx
  • Sleep mode with shutdown current < 15 μA (typ)

Click the image to view larger
Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8302SETTR-T 32-lead QFN -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
APEK8302SES-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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