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.