【产品】高PSRR、低噪声的低压差线性稳压器Au8014A，3A负载电流下压降仅150mV，适用于噪声敏感应用

时间： 2022-04-26 来源：奥拉

技术问答

Au8014A是奥拉（Aurasemi）推出的一款低噪声（4.3μVRMS）、低压差线性稳压器（LDO），在3A负载电流下压降仅150mV。其输出电压可通过可编程输出电压设置引脚进行设置，范围在0.8V到3.95V之间，也可使用外部电阻进行分压调节，范围在0.8V至5.15V之间。

Au8014A由于其出色的电源纹波抑制比（PSRR）和低噪声（4.3μVRMS）特性，使其成为SERDES等高速接口，高速ADC、DAC以及RF组件等5G通讯基础设施中噪声敏感元件的理想电源选择。Au8014A的高PSRR和低噪声组合限制了电源引起的相位噪声和时钟抖动。

Au8014A的5V输出能力非常适合射频放大器和射频前端。而且还非常适合数字负载，例如ASIC、FPGA和DSP等，这些负载需要低输入电压和低输出电压以最大限度地降低功耗，同时可提供出色的瞬态性能，以适应数字负载中由时钟域切换、动态功耗和频率调整产生的电流阶跃。软启动功能可将浪涌电流降至最低，从而在系统级实现平稳可靠的启动。

产品特征

低压差：150mV@3A
线路、负载和温度内，精度1%（最大值）
输出电压噪声：

4.3μVRMS@0.8V输出

7.6μVRMS@5.0V输出

输入电压范围

不带偏置：1.4V至6.5V

带偏置：1.1V至6.5V

两种输出电压模式

0.8V至5.15V（通过电阻分压设置）

0.8V至3.95V（通过编程引脚设置）

出色的电源纹波抑制比PSRR：38dB@1MHz
出色的负载瞬态响应
支持软启动，可抑制浪涌电流
采用3.5mm×3.5mm，20引脚QFN封装

产品应用

5G MIMO射频前端组件
数字负载：SerDes、FPGA和DSP
高速模拟电路：VCO、ADC、DAC和LVDS

功能框图

图1. 功能框图

典型应用

图2. 使用编程引脚设置输出电压的典型应用（偏置供电）

图3. 使用电阻分压设置输出电压的典型应用

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