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.
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