描述 Description

The L4931 is a very low drop regulator available in SO-8, DPAK, PPAK and TO-92 packages and in a wide range of output voltages.

The very low drop voltage (0.4 V) and the very low quiescent current make it particularly suitable for low noise, low power applications and especially in battery-powered systems.

A TTL compatible shutdown logic control function is available in PPAK and SO-8 packages. This means that when the device is used as a local regulator, a part of the board can be put in standby mode, decreasing the total power consumption. It requires only a 2.2 μF capacitor for stability allowing space and cost saving.

The L4931 is available as automotive-grade in SO-8 package only. This device is qualified according to the specification AEC-Q100 of the automotive market, in the temperature range from 40 °C to 125 °C, and the statistical tests: PAT, SYL, SBL are performed.

特性 Features

? Very low dropout voltage (0.4 V)
? Very low quiescent current
? Typ. 50 μA in OFF mode, 600 μA in ON mode
? Output current up to 250 mA
? Logic controlled electronic shutdown
? Output voltages: 3.3; 3.5; 5; 12 V
? Automotive-grade product: 3.3 V VOUT in SO-8 package only
? Internal current and thermal limit
? Only 2.2 μF for stability
? Available in ± 1 % (AB) or 2 % (C) selection at 25 °C
? Supply voltage rejection: 70 dB typ. for 5 V version
? Temperature range: from -40 to 125 °C

簡介

L4931屬于集成電路（IC）的線性+開關穩(wěn)壓器。由制造生產的L4931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換為熱量。對于大多數(shù)應用而言，雖然這種穩(wěn)壓器的效率低于開關模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應用。