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Allegro MicroSystems A8303SESTR-T
- Part No.:
- A8303SESTR-T
- Manufacturer:
- Allegro MicroSystems
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
A8303SESTR-T.pdf
- Description:
- IC REG STEP-UP 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:39,000
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Product details
Overview
A8303SESTR-T from Allegro MicroSystems is a monolithic single LNB supply and control voltage regulator IC designed for analog/digital satellite receivers. It integrates a 352 kHz tracking boost converter, linear regulator, 22 kHz DiSEqC™ tone generator/detector, I²C-compatible interface (up to 400 kHz), and comprehensive fault monitoring (OCP, TSD, UVLO, PNG). It delivers programmable LNB output voltages (e.g., 13.667 V, 19.000 V) with adjustable current limit (250–950 mA) over coaxial cable.
For engineers reviewing the A8303SESTR-T datasheet, A8303SESTR-T pinout, A8303SESTR-T application, or A8303SESTR-T equivalent, key selection considerations include its 20-pin MLP/QFN (4 mm × 4 mm) package, integrated boost MOSFET with 300 mΩ RDS(on), <15 mVPP LNB output ripple, thermal shutdown at 165°C, and DiSEqC™-compliant tone generation/detection without external components.
Technical Context
The A8303SESTR-T implements a current-mode tracking boost converter (352 kHz typical) that regulates BOOST voltage to within 800 mV of the LNB output, minimizing linear regulator power dissipation. Its internal slope compensation, current sensing, and loop compensation are optimized for 15 µH ±30% inductors with DCR <75 mΩ.
It features a bidirectional 2-wire I²C interface (400 kHz max), programmable DAC-based LNB voltage (8 levels), slew rate control via TCAP pin capacitor, and dynamic tone detection thresholds that adapt between transmit (TONECTRL = 1) and receive (TONECTRL = 0) modes for robust coaxial signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±2% - Ensures stable LNB biasing across global satellite standards (e.g., 13.667 V for EU, 11.667 V for Japan). |
| Switching Frequency | 352 kHz typical - Enables compact 15 µH boost inductor and low-profile ceramic filtering. |
| LNB Output Ripple | 15 mVPP (20 MHz BW) - Meets stringent noise requirements for low-noise block downconverter operation. |
| Thermal Shutdown Threshold | 165°C - Protects device during sustained high-current operation or poor PCB thermal design. |
| I²C Clock Frequency | Up to 400 kHz - Supports fast configuration and status polling in real-time satellite receiver systems. |
| Overcurrent Disable Time | 45 ms - Provides controlled fault response before latching OCP, enabling auto-restart recovery. |
| Boost MOSFET RDS(on) | 300 mΩ - Minimizes conduction loss and thermal stress in high-efficiency boost stage. |
Pinout & Package
Package: 20-contact MLP/QFN (ES suffix), 4 mm × 4 mm × 0.75 mm nominal height, exposed thermal pad (PAD) connected to GND plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCP | Charge pump supply | Provides gate drive voltage for internal linear regulator; enables high-side switching capability. |
| BOOST | Tracking boost output | Supplies regulated voltage to linear regulator input; tracks LNB output within 800 mV to minimize dropout loss. |
| LNB | LNB output terminal | Delivers programmable DC voltage (13.667–19.667 V) and 22 kHz tone to satellite dish via coaxial cable. |
| TONECTRL | Tone enable control | Gates internal 22 kHz oscillator on/off for DiSEqC™ command transmission without external circuitry. |
| TDI / TDO | Tone detect input/output | TDI accepts AC-coupled 22 kHz tone from coax; TDO provides open-drain logic output indicating tone presence. |
| ISET | Current limit set | Resistor-to-GND sets LNB output current limit (250–950 mA); scales boost peak current automatically. |
| TCAP | Slew rate timing | Capacitor-to-GND controls LNB voltage rise/fall time (e.g., 10 ms rise, 25 ms fall) for EMI and surge compliance. |
| SCL / SDA | I²C interface | Standard bidirectional 2-wire bus for configuring DAC voltage, reading fault registers (OCP, TSD, UVLO, PNG), and monitoring status. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost MOSFET + compensation | Eliminates need for external switch, current sense resistor, and loop compensation components - reduces BOM count and layout area. |
| Configurable LNB output voltage (8 DAC levels) | Supports regional standards (e.g., 13.667 V EU, 11.667 V Japan, 19.000 V universal) without hardware change. |
| Dynamic tone detection thresholds | Adjusts amplitude/frequency acceptance windows based on TONECTRL state - ensures reliable DiSEqC™ RX/TX over long coax runs. |
| Push-pull LNB output stage | Maintains fast 13↔18 V transitions even with 100 µF load capacitance - meets EN 50494 timing requirements. |
| Comprehensive fault registers | Real-time reporting of undervoltage (UVLO), overcurrent (OCP), thermal shutdown (TSD), and power-not-good (PNG) via I²C status register. |
Applications
| Direct Broadcast Satellite (DBS) Receivers | Digital Terrestrial Television (DTT) Set-Top Boxes |
|---|---|
Use Scenario: Powering and controlling LNBs in consumer satellite TV receivers with multi-switch compatibility. IC Role / Device Role / Timing Role: Single-chip LNB supply, DiSEqC™ tone generation/detection, and fault-safe regulation over coaxial cable. Use Value: Eliminates discrete boost + linear regulator + tone circuit - reduces board space by >40% and improves system-level noise immunity. | Use Scenario: Enabling hybrid broadcast receivers that support both terrestrial and satellite inputs in one chassis. IC Role / Device Role / Timing Role: Providing configurable LNB voltage and seamless DiSEqC™ communication while sharing power domain with DTT tuner. Use Value: Allows unified firmware control of antenna switching and LNB bias via I²C - simplifies multi-standard receiver architecture. |
| Professional Satellite Distribution Systems | Marine/Automotive Satellite Antenna Controllers |
Use Scenario: Centralized LNB powering in multiswitch headends serving multiple receivers in hotels or apartment complexes. IC Role / Device Role / Timing Role: High-reliability LNB regulator with latched fault reporting and thermal derating for continuous operation. Use Value: 165°C thermal shutdown and 45 ms OCP timer prevent cascade failures in dense rack-mounted installations. | Use Scenario: Compact satellite antenna controllers mounted near dish actuators in vibration-prone marine or vehicle environments. IC Role / Device Role / Timing Role: Robust LNB supply with wide input range (10–16 V), low EMI, and transient-hardened protection. Use Value: Stable 13/18 V output under automotive battery fluctuations (cold crank, load dump) due to 8.35 V UVLO threshold and 350 mV hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LNB supply and control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2102ETJ+T | Higher quiescent current (25 mA vs. 11 mA), no integrated tone detector - requires external 22 kHz circuit. | Lacks DiSEqC™ tone detection; suitable only where tone generation suffices and board space allows extra components. | Select when legacy MAX2102 footprint compatibility is required and tone RX functionality is handled externally. |
| STV0900B | Integrated dual-LNB controller (two independent channels), higher integration but larger QFN-48 package. | Designed for dual-output systems (e.g., twin-tuner PVRs); not drop-in compatible for single-LNB designs. | Choose only for new dual-LNB architectures - not a functional substitute for A8303SESTR-T's single-channel optimization. |
Compared with MAX2102ETJ+T and STV0900B, the A8303SESTR-T uniquely combines single-channel LNB regulation, integrated tone generation *and* detection, minimal external component count, and industry-leading 15 mVPP output noise - making it optimal for cost-sensitive, space-constrained satellite receivers requiring full DiSEqC™ compliance.
Availability
A8303SESTR-T is available at Aetrix Electronics and suitable for direct broadcast satellite (DBS) receivers, digital terrestrial television (DTT) set-top boxes, professional satellite distribution systems, and marine/automotive satellite antenna controllers requiring stable component supply despite its Last Time Buy status.
Supply support for A8303SESTR-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer of high-performance power ICs and magnetic sensors, headquartered in Manchester, NH, with focus on automotive, industrial, and communications markets.
The A8303SESTR-T belongs to Allegro's satellite LNB power management product line, engineered specifically to replace discrete boost + linear + tone solutions in analog/digital satellite receivers with a single monolithic IC meeting EN 50494 and DiSEqC™ 1.0/1.1/1.2 standards.
FAQ
What is the function of the TCAP pin on the A8303SESTR-T?
The TCAP pin on the A8303SESTR-T sets LNB output voltage slew rate via an external capacitor. Charging/discharging current (±10 µA typical) through this capacitor controls rise time (e.g., 10 ms for 13→19 V) and fall time (e.g., 25 ms for 19→13 V), ensuring compliance with EN 50494 transient limits and reducing EMI. The A8303SESTR-T datasheet specifies 100 nF as the recommended value for most applications.
Does the A8303SESTR-T support Japanese LNB voltage requirements?
Yes, the A8303SESTR-T supports Japanese market requirements through its companion variant A8303SESTR-T-1, which includes a dedicated 11.667 V output setting. While the base A8303SESTR-T offers 8 programmable DAC levels (including 13.667 V and 19.000 V), the -1 suffix version adds the 11.667 V option explicitly validated for JIS C 61000-4-5 compliance in Japanese satellite receivers.
How does the A8303SESTR-T handle short-circuit conditions on the LNB output?
The A8303SESTR-T limits LNB output current to the value set by the ISET resistor (250–950 mA). If this limit is exceeded for more than 45 ms, the device disables the LNB output and sets the OCP bit in the status register. Recovery requires host MCU re-enabling via I²C command. This behavior is documented in the A8303SESTR-T functional description and protects against sustained shorts without latch-up.
Can the A8303SESTR-T operate without an external boost inductor?
No, the A8303SESTR-T requires an external boost inductor (recommended 15 µH ±30%, DCR <75 mΩ) to function. Its internal boost switch drives this inductor to generate the BOOST voltage, which feeds the tracking linear regulator. Omitting the inductor prevents BOOST voltage generation, causing LNB output failure and triggering UVLO or PNG faults. The A8303SESTR-T datasheet provides detailed inductor selection guidelines on pages 11–12.
What is the maximum ambient temperature rating for continuous operation of the A8303SESTR-T?
The A8303SESTR-T is rated for continuous operation from –20°C to +85°C ambient temperature (Range S). Its junction temperature must not exceed 150°C, and thermal resistance RθJA is 37°C/W on a 4-layer JEDEC-standard PCB. At 85°C ambient and full load, careful PCB thermal design (e.g., 2 oz copper, thermal vias under exposed pad) is essential to avoid thermal shutdown at 165°C.
A8303SESTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- Step-Up (Boost)
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 352kHz
- Synchronous Rectifier:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN-EP (4x4)
A8303SESTR-T FAQ
1.How can I place an order for A8303SESTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A8303SESTR-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A8303SESTR-T reliable?
The price and inventory of A8303SESTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A8303SESTR-T is usually 5 days.
3.What payment methods are accepted for A8303SESTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A8303SESTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A8303SESTR-T?
A8303SESTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A8303SESTR-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A8303SESTR-T?
For technical support, including A8303SESTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A8303SESTR-T requirements.
6.How does Aetrix verify that A8303SESTR-T is sourced from the original manufacturer or authorized distributors?
All A8303SESTR-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A8303SESTR-T meets industry standards.
7.What is the process for return or replacement of A8303SESTR-T?
All A8303SESTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A8303SESTR-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A8303SESTR-T part is unused and in its original packaging.
Return procedure for A8303SESTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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