L4938ND集成電路（IC）的線性+開關(guān)穩(wěn)壓器規(guī)格書PDF中文資料

L4938ND屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由意法半導(dǎo)體集團(tuán)制造生產(chǎn)的L4938ND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。

DESCRIPTION

The L4938N is a monolithic integrated dual voltage regulators with two very low dropout outputs and additional functions such as power-on reset and input voltage sense. They are designed for supplying microcomputer controlled systems specially in automotive applications.

■ STANDBY OUTPUT VOLTAGE PRECISION 5V ± 2

■ OUTPUT 2 TRACKED TO THE STANDBY OUTPUT

■ OUTPUT 2 DISABLE FUNCTION FOR STANDBY MODE

■ VERY LOW QUIESCENT CURRENT, LESS THAN 250μA, IN STANDBY MODE

■ OUTPUT 2 VOLTAGE SETTABLE FROM 5 TO 20V

■ OUTPUT CURRENTS : I01 = 50mA, I02 = 500mA

■ VERY LOW DROPOUT (max 0.4V/0.6V)

■ OPERATING TRANSIENT SUPPLY VOLTAGE UP TO 40V

■ POWER-ON RESET CIRCUIT SENSING THE STANDBY OUTPUT VOLTAGE

■ POWER-ON RESET DELAY PULSE DEFINED BY THE EXTERNAL CAPACITOR

■ EARLY WARNING OUTPUT FOR SUPPLY UNDERVOLTAGE

■ THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS