TPS7A21集成电路（IC）的线性+开关稳压器规格书PDF中文资料

TPS7A21属于集成电路（IC）的线性+开关稳压器。由德州仪器制造生产的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。

1 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 (line, load, and temperature)

• Supports wide range of ceramic capacitors:

– 1 μF to 200 μF

• Operating junction temperature: –40°C to +125°C

• Package:

– 0.602-mm × 0.602-mm power DSBGA

2 Applications

• Mobile phones and tablets

• Wearables

• IP cameras

• Portable medical equipment

• Smart meters and field transmitters

• RF, PLL, VCO, and clock power supplies

• Motor drives

3 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.

With the device low quiescent current, the TPS7A21

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.