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.