TPS7A4518DCQR集成电路（IC）的线性+开关稳压器规格书PDF中文资料

TPS7A4518DCQR属于集成电路（IC）的线性+开关稳压器。由德州仪器制造生产的TPS7A4518DCQR稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

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.