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.