TPS791集成电路（IC）的线性+开关稳压器规格书PDF中文资料

TPS791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TPS791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

1• 100-mA Low-Dropout Regulator With EN

• Available in 1.8-V, 3.3-V, 4.7-V, and Adj.

• High PSRR (70 dB at 10 kHz)

• Ultralow Noise (15 μVRMS)

• Fast Start-Up Time (63 μs)

• Stable With Any 1-μF Ceramic Capacitor

• Excellent Load, Line Transient

• Very Low Dropout Voltage (38 mV at Full Load,

TPS79147)

• 5-Pin SOT23 (DBV) Package

• TPS792xx Provides EN Options

2 Applications

• Powering VCOs and PLLs

• Bluetooth and Wireless LAN

• Portable and Battery Operated

3 Description

The TPS791 device is a low-dropout (LDO) lowpower

linear voltage regulator that features high

power-supply rejection ratio (PSRR), ultralow noise,

fast start-up, and excellent line and load transient

responses in a small outline, SOT23 package. The

device is stable, with a small 1-μF ceramic capacitor

on the output. The TPS791 uses an advanced,

proprietary BiCMOS fabrication process to yield

extremely low dropout voltages (for example, 38 mV

at 100 mA, TPS79147). This device achieves fast

start-up times (approximately 63 μs with a 0.001-μF

bypass capacitor) while consuming very low

quiescent current (170 μA typical). Moreover, when

the device is placed in standby mode, the supply

current is reduced to less than 1 μA. The TPS79118

exhibits approximately 15 μVRMS of output voltage

noise with a 0.1-μF bypass capacitor. Applications

with analog components that are noise sensitive,

such as portable RF electronics, benefit from the high

PSRR and low noise features as well as the fast

response time.