50-mA Low-Dropout Regulator
Available in 1.5-V, 1.8-V, 2.5-V, 2.8-V, 3.0-V
Output Noise Typically 56 μVRMS
(TPS79030)
Only 17 μA Quiescent Current at 50 mA
1 μA Quiescent Current in Standby Mode
Dropout Voltage Typically 57 mV at 50 mA
(TPS79030)
Over Current Limitation
–40°C to 125°C Operating Junction
Temperature Range
5-Pin SOT-23 (DBV) Package

description
The TPS790xx family of low-dropout (LDO)
voltage regulators offers the benefits of
low-dropout voltage, ultralow-power operation,
low-output noise, and miniaturized packaging.
These regulators feature low-dropout voltages
and ultralow quiescent current compared to
conventional LDO regulators. An internal resistor,
in conjunction with an external bypass capacitor,
creates a low-pass filter to reduce the noise. The
TPS79030 exhibits only 56 μVRMS of output
voltage noise using 0.01 μF bypass and 10 μF
output capacitors. Offered in a 5-terminal small
outline integrated-circuit SOT-23 package, the
TPS790xx series devices are ideal for
micropower operations, low output noise, and
where board space is limited.
The usual PNP pass transistor has been replaced
by a PMOS pass element. Because the PMOS
pass element behaves as a low-value resistor, the
dropout voltage is very low, typically 57 mV at
50 mA of load current (TPS79030), and is directly
proportional to the load current. The quiescent
current is ultralow (17 μA typically) and is stable
over the entire range of output load current (0 mA
to 50 mA). Intended for use in portable systems
such as laptops and cellular phones, the
ultralow-dropout voltage feature and ultralowpower
operation result in a significant increase in
system battery operating life.