TPS720

具有偏置引脚的 350mA、超低输入电压、RF 低压降线性稳压器

The family of dual rail, low-dropout linear regulators LDOs offers outstanding ac performance PSRR, load and line transient response, while consuming a very low quiescent current of 38 µA.

The VBIAS rail that powers the control circuit of the LDO draws very low current on the order of the quiescent current of the LDO and can be connected to any power supply that is equal to or greater than 1.4 V above the output voltage. The main power path is through VIN, which can be a lower voltage than VBIAS; it can be as low as VOUT \+ VDO, increasing the efficiency of the solution in many power-sensitive applications. For example, VIN can be an output of a high-efficiency, DC-DC step-down regulator.

The TPS720 supports a novel feature in which the output of the LDO regulates under light loads when the IN pin is left floating. The light-load drive current is sourced from VBIAS under this condition. This feature is particularly useful in power-saving applications where the DC-DC converter connected to the IN pin is disabled but the LDO is still required to regulate the voltage to a light load.

The TPS720 is stable with ceramic capacitors and uses an advanced BICMOS fabrication process that yields a dropout of 110 mV at a 350-mA output load. The TPS720 has the unique feature of providing a monotonic VOUT rise overshoot limited to 3% with VIN inrush current limited to 100 mA + ILOAD with an output capacitor of 2.2 µF.

The TPS720 uses a precision voltage reference and feedback loop to achieve overall accuracy of 2% over load, line, process, and temperature extremes. An ultra-small DSBGA package makes the TPS720 ideal for handheld applications. The TPS720 is also available in a SON-8 package. This family of devices is fully specified over the temperature range of TJ = –40°C to 125°C.

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350-mA High-Performance LDO

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Low Quiescent Current: 38 µA

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Excellent Load Transient Response:

±15 mV for ILOAD = 0 mA to 350 mA in 1 µs

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Excellent Line Transient Response:

ΔVOUT = ±2 mV for ΔVBIAS = ±600 mV in 1 µs

ΔVOUT = ±200 µV for ΔVIN = ±400 mV in 1 µs

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Low Noise: 48 µVRMS 10 Hz to 100 kHz

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80 dB VIN PSRR 10 Hz to 10 kHz

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70 dB VBIAS PSRR 10 Hz to 10 kHz

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Fast Start-Up Time: 140 µs

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Built-In Soft-Start With Monotonic VOUT Rise and

Start-Up Current Limited to 100 mA + ILOAD

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Overcurrent and Thermal Protection

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Low Dropout: 110 mV at ILOAD = 350 mA

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Stable with 2.2-µF Output Capacitor

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Available in 1.33 mm × 0.96 mm DSBGA-5 and 2

mm × 2 mm SON-6 Packages