TPS7A21集成電路（IC）的線性+開關(guān)穩(wěn)壓器規(guī)格書PDF中文資料

TPS7A21屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由德州儀器制造生產(chǎn)的TPS7A21穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無論負載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個最小量，并且在工作時會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(shù)應用而言，雖然這種穩(wěn)壓器的效率低于開關(guān)模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應用。

1 Features

? AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C

– Junction temperature: –40°C to +150°C

? Very low IQ: 6.5μA

? Input voltage range: 2.0V to 6.0V

? Output voltage range: 0.8V to 5.5V (50mV steps)

? High PSRR: 91dB at 1kHz

? Low output voltage noise: 7.7μVRMS

? Low dropout:

– 265mV (maximum) at 500mA (2.5V VOUT)

? Smart EN pulldown

? Output voltage tolerance: ±1% at 1mA IOUT

? Supports a wide range of ceramic capacitors:

– 1μF to 200μF

? Package:

– 3mm × 3mm wettable flank VSON

– 2mm × 2mm wettable flank WSON (Advance

Information)

– 2mm × 2mm WSON (Advance Information)

2 Applications

? DAS cameras and radar

? Automotive infotainment

? Telematics systems

? Navigation systems

3 Description

The TPS7A21-Q1 is a small, low-dropout (LDO)

linear voltage regulator that sources 500mA 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 in automotive applications. Innovative

design techniques result in low-noise performance

without the addition of an external noise bypass

capacitor. The TPS7A21-Q1 low quiescent current

is a good choice for low-power systems. The 2.0V

to 6.0V input voltage range and 0.8V to 5.5V

output voltage range support a variety of system

requirements. The maximum output voltage tolerance

is 1.5%, –2.25% over load, line, and temperature

variations.

An internal soft-start circuit helps control 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. This circuit

also helps eliminate external components that are

otherwise required to pull down the EN input.