These single, low-noise step-down conversion regulators (LNBRs) consist of a monolithic linear boost converter and a low-dropout linear regulator for use in analog and digital satellite receivers. Designed specifically to provide power and interface signals to LNB downconverters over coaxial cable in satellite TV receiver systems.
The A8300 and A8300-1 have integrated boost switches and compensation circuitry, requiring only a small number of external components. The device chooses a switching frequency of 563 kHz, which minimizes the size of the passive filter element.
The IC provides a 22-kHz internal tone for DiSEqC™ communication that is gated using a control pin or accepts an external tone of 22-kHz through this pin. In addition, the devices incorporate tone detection capabilities to support full bidirectional DiSEqC™ communication, as well as an integrated gate driver for filter bypass FETs.
The I2C-compatible™ interface combines control and diagnostics to meet the requirements of complex systems and report system faults. In addition, the "sleep pin" minimizes power consumption and allows the device to be quickly shut down when necessary without invoking 2C™ control.
The device also offers a power failure (EPF) warning function to help calibrate the status of the 12 volt rail and initiate the shutdown procedure.
Both the A8300 and A8300-1 are available in a 4 mm × 4 mm lead-free QFN package (suffix ES) with 100% matte tin plating.
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集成升压 MOSFET、电流感应、补偿和输出 LDO
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可配置升压电容器选项：
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电源故障 (EPF) 预警功能
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反馈电流控制
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稳定的额定输出电压，提供浪涌保护和反馈保护
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可调 LNB 输出电流限制，从 300 至 950 mA
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可选过流禁用定时器
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可满足广泛的应用需求
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最大限度优化元件尺寸，迎合各种应用需求
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用于启动、重新配置、及连续输出（最大值取决于 PCB 散热设计）
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通过 LNB 电流限制设置升压峰值电流限制水平
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可锁定或自动重启 LNB 过流限制保护和 TSD
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完全兼容 DiSEqC™
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动态音调检测幅度和频率的发送/接收阈值
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诊断功能：PNG、TDET 以及 EPF
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广泛的保护功能：UVLO、TSD、CPOK 以及 OCP