TPS7A21中文资料500mA 低噪声、低 IQ、高 PSRR 低压降 (LDO) 稳压器数据手册TI规格书

描述 Description

The TPS7A21 is an ultra-small, low-dropout (LDO) linear voltage regulator that can source 500 mA of output current. The device provides low noise, high PSRR, and excellent load and line transient performance to meet the requirements of RF and other sensitive analog circuits. Innovative design techniques result in low-noise performance without the addition of an external noise bypass capacitor. The TPS7A21 low quiescent current is a good choice for battery-powered systems. The 2.0-V to 6.0-V input voltage range and 0.8-V to 5.5-V output voltage range support a variety of system requirements. The internal precision reference circuit enables excellent accuracy; the maximum output voltage tolerance is 1.5% over load, line, and temperature variations.

An internal soft-start circuit helps control the inrush current, thus minimizing the input voltage drop during start up. The LDO is stable with small ceramic capacitors, allowing for a small overall solution size.

A smart enable input circuit with an internally controlled pulldown resistor keeps the LDO disabled even when the EN pin is unconnected and helps eliminate external components that are otherwise required to pull down the EN input.

特性 Features

• Very low IQ: 6.5 µA
• Output voltage range: 0.8 V to 5.5 V (50-mV steps)
• Low output voltage noise: 7.7 µVRMS
• 175 mV (maximum) at 500 mA (2.5-V VOUT)
• Smart EN pulldown
• Stable with 1-µF ceramic output capacitors
• Package:
• 0.602-mm × 0.602-mm power DSBGA

简介

TPS7A21属于集成电路（IC）的线性+开关稳压器。由TI制造生产的TPS7A21稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。