L4931中文资料带抑制功能的极低压降稳压器数据手册ST规格书

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

简介

L4931属于集成电路（IC）的线性+开关稳压器。由制造生产的L4931稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。