A8304SESTR-T Allegro MicroSystems-Single LNB Supply and Control Voltage Regulator

Allegro MicroSystems A8304SESTR-T +BOM

The Allegro MicroSystems A8304SESTR-T is a single-channel Low Noise Block Regulator (LNBR). It integrates a monolithic boost converter with MOSFET, current sensing, and compensation. Featuring a 704 kHz switching frequency, it uses few external components. With an I²C-compatible interface, it offers programmable voltage (±2% accuracy) and diagnostics. The SLEEP pin enables low-power shutdown. Housed in a 3mm x 3mm QFN package, it’s RoHS-compliant, operates at -20°C to 85°C, and suits satellite communication and RF systems.

Allegro MicroSystems A8304SESTR-T's Features

I. Core Functional Integration

• Monolithic Boost Converter: Integrates boost MOSFET, current sensing, and compensation circuitry to reduce the need for external components.
• Low-Noise Design: Serves as a single-channel Low Noise Block Regulator (LNBR), suitable for noise-sensitive communication systems.

II. Performance Parameters

• Switching Frequency: 704 kHz, supporting small external components (e.g., inductors, capacitors) to save circuit board space.
• Output Current Limit: Adjustable range of 250 mA to 950 mA* (maximum value depends on PCB thermal design), with a shutdown timer function.
• Boost Peak Current Limit: Scales with the LNB current limit to optimize overload protection.
• Optional Temporary Current Boost: Supports a temporary 25% increase in current limit to handle instantaneous load demands.

III. Interfaces and Control

• I²C-Compatible Interface: Enables two-wire control for configuring output voltage, enabling/disabling functions, and system status diagnostics.
• DiSEqC 1.x Compatibility: Adapts to the DiSEqC protocol in satellite communications, supporting flexible 22 kHz tone generation.
• Sleep Mode (Sleep Pin): Enables quick shutdown of the device without I²C control to achieve low-power mode and maximize power efficiency.
• Programmable Output Voltage: Achieves ±2% accuracy, supporting startup, reconfiguration, and continuous output control.

IV. Protection and Diagnostic Functions

• Multiple Protection Mechanisms:
  • Undervoltage Lockout (UVLO)
  • Overcurrent Protection (OCP)
  • Thermal Shutdown (TSD)
• Diagnostic Features: Supports fault reporting (e.g., PND status) for rapid system problem localization.
• SINK_DIS Bit: Controls the pull-up/pull-down state of push-pull output pins to enhance interface flexibility.

V. Packaging and Compliance

• Package: 3 mm x 3 mm QFN package with an exposed pad for optimized thermal dissipation.
• Environmental Standards: Lead-free (Pb-free), 100% matte tin leadframe plating, compliant with RoHS standards.
• Operating Temperature Range: -20°C to 85°C, suitable for wide-temperature environments.

Allegro MicroSystems A8304SESTR-T's Applications

Core Application Scenarios: Supplies stable power to Low-Noise Blocks (LNBs) in satellite receiving equipment. LNBs amplify and downconvert satellite signals, requiring extremely low-power noise. The A8304's low-noise design and precise voltage regulation (±2% accuracy) ensure signal quality remains unaffected by power interference.
Protocol Compatibility: Supports DiSEqC 1.x protocols and flexible 22 kHz tone generation, adapting to multi-satellite switching and antenna control needs. Widely used in home satellite TV receivers and professional satellite communication terminals.

Applicable Scenarios: Serves as a low-noise power regulator in RF front-end modules, base station sensors, or small wireless transceivers. Its 704 kHz switching frequency, paired with small external components (e.g., inductors, capacitors), saves PCB space for compact RF system designs.
Current Management Advantages: Adjustable output current limiting (250–950 mA*) and temporary current boost function (+25%) address transient high-power demands of RF components. The Sleep Pin enables low-power standby mode to optimize battery life.

Industrial Control Scenarios: Powers low-power sensors and communication modules in industrial automation equipment, sensor networks, or Distributed Control Systems (DCS). Its wide operating temperature range (-20°C to 85°C) and multiple protection mechanisms (UVLO/OCP/TSD) ensure stable operation in harsh environments.
Embedded Design: The 3 mm x 3 mm QFN package with exposed pad thermal design suits space-constrained embedded motherboards or edge computing devices, especially in multi-channel systems requiring dense layouts.

Typical Applications: Used in portable satellite communication terminals, UAV communication modules, etc. Integrated boost MOSFET and compensation circuits reduce external component count, lowering system cost and complexity. The I²C-compatible interface supports dynamic output voltage configuration for diverse load requirements.
Power Efficiency Optimization: Sleep mode and low quiescent current design extend battery life, ideal for power-sensitive handheld devices.

Evaluation Board Compatibility: Paired with the APEK8304SES-01-MH evaluation board (non-RoHS compliant) for rapid performance validation in real-world circuits. Supports engineer-led noise testing, load response analysis, and protocol compatibility debugging.

Prohibited Application Areas：Allegro explicitly stipulates that the A8304 series is forbidden for use in life support systems or any equipment where product failure may cause personal injury (e.g., medical emergency devices, aviation safety-critical systems, etc.).

Allegro MicroSystems A8304SESTR-T's Attributes

Allegro MicroSystems A8304SESTR-T's Datasheet

Allegro MicroSystems A8304SESTR-T's Pinouts

Allegro MicroSystems A8304SESTR-T's Category-Single LNB Supply and Control Voltage Regulator

Single LNB (Low Noise Block) supply and control voltage regulators play a pivotal role in satellite communication systems, ensuring stable, low-noise power delivery to LNB components that are critical for signal amplification and frequency conversion. These regulators must balance precision voltage regulation, robust noise suppression, and flexible control interfaces to meet the demands of modern satellite receivers and communication terminals. Key requirements include adjustable output current limits, compatibility with DiSEqC protocols for satellite switching, and advanced protection features to safeguard against voltage fluctuations and thermal stress.
The Allegro MicroSystems A8304SESTR-T exemplifies excellence in this domain. As a single-channel LNBR, it integrates a monolithic boost converter with built-in MOSFET, current sensing, and compensation circuitry, minimizing external components while delivering 704 kHz switching frequency for compact designs. Its I²C-compatible interface enables programmable voltage levels (±2% accuracy) and diagnostic reporting, while a dedicated SLEEP pin ensures low-power shutdown without digital control. With adjustable current limits (250–950 mA*) and temporary overload capability (+25%), it adapts to diverse LNB loads. Housed in a 3 mm x 3 mm QFN package with thermal pad, the A8304SESTR-T combines RoHS compliance and wide-temperature operation (-20°C to 85°C), making it ideal for satellite TV receivers, wireless RF systems, and industrial embedded applications. Allegro’s focus on low noise, high integration, and reliable protection solidifies the A8304SESTR-T as a leading choice for next-generation LNB power management.

A8304SESTR-T's Manufacturer- Allegro MicroSystems 

Allegro MicroSystems has established itself as a leading innovator in the Single LNB Supply and Control Voltage Regulator domain, delivering cutting-edge solutions that define performance and reliability in satellite communication systems. The company’s expertise lies in integrating advanced power management technologies with low-noise design principles, addressing the critical needs of LNB (Low Noise Block) components that require stable, interference-free power to amplify and downconvert satellite signals effectively.
A prime example of Allegro’s achievement is the A8304SESTR-T, a single-channel Low Noise Block Regulator (LNBR) that combines a monolithic boost converter with integrated MOSFET, current sensing, and compensation circuitry. This design minimizes external components while achieving a 704 kHz switching frequency, enabling compact and efficient layouts for satellite receivers and RF systems. The device’s I²C-compatible interface offers programmable voltage levels (±2% accuracy) and diagnostic capabilities, ensuring seamless integration with complex control systems. Additionally, features like the SLEEP pin for low-power shutdown, adjustable current limits (250–950 mA*), and DiSEqC 1.x compatibility for 22 kHz tone generation highlight Allegro’s focus on flexibility and system-level optimization.
Housed in a 3 mm x 3 mm QFN package with thermal dissipation features, the A8304SESTR-T exemplifies Allegro’s commitment to miniaturization and thermal efficiency. Its RoHS compliance and wide operating temperature range (-20°C to 85°C) further expand its applicability across industrial, consumer, and aerospace environments. By prioritizing low noise, high integration, and robust protection (UVLO, OCP, TSD), Allegro MicroSystems continues to set benchmarks in LNB power management, empowering next-generation satellite communication solutions worldwide.

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