The A8304 is a single-channel low-noise module regulator (LNBR). The A8304 consists of a monolithic boost converter and a low-dropout linear regulator. Designed specifically to provide power and interface signals to LNB downconverters over coaxial cable in satellite TV receiver systems.
The A8304 has an integrated boost switch and compensation circuitry, requiring only a small number of external components. The use of a 704 kHz switching frequency and user-controlled output current limit greatly reduces the size of passive filtering elements.
The I2C-compatible™ interface combines control and diagnostics to meet the requirements of complex systems and report system faults.
The "sleep pin" minimizes power consumption and allows the device to be quickly shut down when necessary without invoking 2C™ control.
The A8304 is available in a small 3×3 mm QFN package with an exposed heatsink to assist with heat dissipation. The package is a lead-free (Pb) package with a 100% matte tin plated pin frame.
-
集成升压 MOSFET、电流感应和补偿
-
704 kHz 开关频率，适合小型低成本元件
-
sleep引脚，实现超低功耗模式
-
LNB 输出电流限值可调（250 到 950 mA*），采用 Shutdown Timer 限制
-
可满足广泛的应用需求
-
最大限度优化元件尺寸，迎合各种应用需求
-
适合启动、重新配置以及连续输出
-
根据 LNB 电流限值设置升压峰值电流限值
-
可选择临时增加的电流限值 (+25%)
-
可兼容与 DiSEqC1.x control2-wire I2C™——兼容的控制和状态接口
-
可编程 LNB 输出电压水平（2% 精确度）
-
启用/禁用输出
-
灵活的 22 kHz 音频发生方法
-
推挽式输出反向电流阈值采用 SINK_DIS 位控制
-
诊断功能：PNG
-
广泛的保护功能：UVLO、OCP、TSD
* The maximum value depends on the PCB thermal design