1 Features

1• Optimized for Fast Transient Response

• Output Current: 1.0 A

• Dropout Voltage: 300 mV

• Low Noise: 45 μVRMS (10 Hz to 100 kHz)

• 1-mA Quiescent Current

• No Protection Diodes Needed

• Controlled Quiescent Current in Dropout

• Adjustable Output Voltage: 1.21 to 20 V

• Less Than 1-μA Quiescent Current in Shutdown

• Stable With 10-μF Output Capacitor

• Stable With Ceramic Capacitors

• Reverse-Battery Protection

• No Reverse Current

• Thermal Limiting

2 Applications

• 3.3-V to 2.5-V Logic Power Supplies

• Post Regulator for Switching Supplies

• Portable/Battery-Powered Equipment.

3 Description

The TPS73801 is a low-dropout (LDO) regulator

optimized for fast transient response. The device can supply 1.0 A of output current with a dropout voltage

of 300 mV. Operating quiescent current is 1 mA,

dropping to less than 1 μA in shutdown. Quiescent

current is well controlled; it does not rise in dropout as it does with many other regulators. In addition to

fast transient response, the TPS73801 regulators

have very low output noise, which makes them ideal

for sensitive RF supply applications.

Output voltage range is from 1.21 to 20 V. The

TPS73801 regulators are stable with output

capacitors as low as 10 μF. Small ceramic capacitors

can be used without the necessary addition of ESR,

as is common with other regulators. Internal

protection circuitry includes reverse-battery

protection, current limiting, thermal limiting, and reverse-current protection. The devices are available

as an adjustable device with a 1.21-V reference

voltage. The TPS73801 regulators are available in

the 6-pin TO-223 (DCQ) packages.