描述 Description

The L4989M and L4989MD are monolithic integrated 5 V voltage regulators with a low drop voltage at currents up to 150 mA.

The output voltage regulating element consists in a p-channel MOS and the regulation is performed regardless of input voltage transients up to 40 V. The high precision of the output voltage is obtained with a pre-trimmed reference voltage.

The devices are protected against short circuit and an overtemperature protection switches off the devices in case of extremely high power dissipation.

The L4989M and L4989MD watchdogs are active when the Enable pin is high. Features like reset and watchdog make this devices particularly suitable to supply microprocessor systems in automotive applications.

特性 Features

? AEC-Q100 qualified
? Operating DC supply voltage range 5.6 V to 31 V
? Very low quiescent current with watchdog disabled
? Precision output voltage (±3%)
? Low drop voltage (180 mV typ at Io = 150 mA)
? Reset circuit sensing the output voltage down to 1 V
? Programmable reset delay with external capacitor
? Watchdog disable input
? Programmable watchdog timer with external capacitor
? Thermal shutdown and short circuit protection
? Wide temperature range (Tj = -40°C to 150°C)

簡介

L4989D屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由制造生產(chǎn)的L4989D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。