1 Features
1• Optimized for Fast Transient Response
• Output Current: 1.5 A
• High Output Voltage Accuracy: 1% at 25°C
• Dropout Voltage: 300 mV
• Low Noise: 35 μV RMS (10 Hz to 100 kHz)
• High Ripple Rejection: 68 dB at 1 kHz
• 1-mA Quiescent Current
• No Protection Diodes Needed
• Controlled Quiescent Current in Dropout
• Fixed Output Voltages: 1.5 V, 1.8 V, 2.5 V, 3.3 V
• Adjustable Output from 1.21 V to 20 V
(TPS7A4501 Only)
• Less Than 1-μA Quiescent Current in Shutdown
• Stable With 10-μF Ceramic Output Capacitor
• Reverse-Battery Protection
• Reverse Current Protection

2 Applications
• Industrial
• Wireless Infrastructure
• Radio-Frequency Systems

3 Description
The TPS7A45xx devices are low-dropout (LDO)
regulators optimized for fast transient response. The device can supply 1.5 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 with many other regulators. In
addition to fast transient response, the TPS7A45xx
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
TPS7A45xx regulators are stable with output
capacitance 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
in fixed output voltages of 1.5 V, 1.8 V, 2.5 V, 3.3 V,
and as an adjustable device with a 1.21-V reference
voltage.