TPS7A21数据手册集成电路（IC）的线性+开关稳压器规格书PDF

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
• Input voltage range: 2.0 V to 6.0 V
• Output voltage range: 0.8 V to 5.5 V (50-mV steps)
• High PSRR: 91 dB at 1 kHz
• Low output voltage noise: 7.7 µVRMS
• Low dropout:
• 175 mV (maximum) at 500 mA (2.5-V VOUT)

• Smart EN pulldown
• Output voltage tolerance: ±1.5%
• Stable with 1-µF ceramic output capacitors
• Operating junction temperature: –40°C to +125°C
• Package:
• 0.602-mm × 0.602-mm power DSBGA