TPS78928屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由美國德州儀器公司制造生產(chǎn)的TPS78928穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無論負(fù)載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個最小量，并且在工作時會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開關(guān)模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應(yīng)用。

100-mA Low-Dropout Regulator

Available in 1.5-V, 1.8-V, 2.5-V, 2.8-V, 3.0-V

Output Noise Typically 56 μVRMS

(TPS78930)

Only 17 μA Quiescent Current at 100 mA

1 μA Quiescent Current in Standby Mode

Dropout Voltage Typically 115 mV at 100 mA

(TPS78930)

Over Current Limitation

–40°C to 125°C Operating Junction

Temperature Range

5-Pin SOT-23 (DBV) Package

description

The TPS789xx family of low-dropout (LDO)

voltage regulators offers the benefits of

low-dropout voltage, ultralow-power operation,

low-output noise, and miniaturized packaging.

These regulators feature low-dropout voltages

and ultralow quiescent current compared to

conventional LDO regulators. An internal resistor,

in conjunction with an external bypass capacitor,

creates a low-pass filter to reduce the noise. The

TPS78930 exhibits only 56 μVRMS of output

voltage noise using 0.01 μF bypass and 10 μF

output capacitors. Offered in a 5-terminal small

outline integrated-circuit SOT-23 package, the

TPS789xx series devices are ideal for

micropower operations, low output noise, and

where board space is limited.

The usual PNP pass transistor has been replaced

by a PMOS pass element. Because the PMOS

pass element behaves as a low-value resistor, the

dropout voltage is very low, typically 115 mV at

100 mA of load current (TPS78930), and is

directly proportional to the load current. The

quiescent current is ultralow (17 μA typically) and

is stable over the entire range of output load

current (0 mA to 100 mA). Intended for use in

portable systems such as laptops and cellular

phones, the ultralow-dropout voltage feature and

ultralow-power operation result in a significant

increase in system battery operating life.