TPS78825DBVR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TPS78825DBVR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(gè)最小量，并且在工作時(shí)會(huì)將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對(duì)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(duì)噪聲高度敏感的應(yīng)用。

FEATURES

150-mA Low-Dropout Regulator

Available in 2.5 V, 3.3 V

Programmable Slew Rate Control

Output Noise Typically 56 μVRMS

Only 17 μA Quiescent Current at 150 mA

1 μA Quiescent Current in Standby Mode

Dropout Voltage Typically 150 mV at 150 mA

(TPS78833)

Over Current Limitation

–40°C to 125°C Operating Junction

Temperature Range

5-Pin SOT-23 (DBV) Package

DESCRIPTION

The TPS78825 and TPS78833 are very small (SOT-23)

package, low-noise LDOs that regulate the output

voltage to 2.5 V and 3.3 V with input voltage ranging

from 2.7 V to an absolute maximum of 13.5 V. These

devices output 150 mA with a peak current of 350 mA

(typ). The TPS788xx family uses the SR pin to program

the output voltage slew rate to control the in-rush

current. This is specifically used in the USB application

where large load capacitance is present at start-up. The

TPS788xx devices use only 17 μA of quiescent current

and exhibit only 56 μVRMS of output voltage noise using

a 10 μF output capacitor.

The usual PNP pass transistor has been replaced by a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 150 mV at 150 mA of load current, and

is directly proportional to the load current.

The TPS788xx also features a logic-enabled sleep

mode to shut down the regulator, reducing quiescent

current to 1 μA typical at TJ = 25°C.