LD1117A中文资料低压降固定和可调正电压稳压器数据手册ST规格书

描述 Description

The LD1117A is a low drop voltage regulator able to provide up to 1 A of output current, available also in adjustable versions (VREF= 1.25 V). In fixed versions, the following output voltages are offered: 1.2 V, 1.8 V, and 3.3 V. The device is supplied in: SOT-223, DPAK and TO-220. Surface mounted packages optimize the thermal characteristics while offering a relevant space saving advantage. High efficiency is assured by an NPN pass transistor. Only a very common 10 μF minimum capacitor is needed for stability. Chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2% at 25 °C.

特性 Features

• Low dropout voltage:
•1.15 V typ. @ IOUT= 1 A, 25 °C
• Very low quiescent current:
•5 mA typ. @ 25 °C
• Output current up to 1 A
• Fixed output voltage of:
•1.2 V, 1.8 V, 3.3 V
• Adjustable version availability (VREF= 1.25 V)
• Internal current and thermal limit
• Only 10 μF for stability
• Available in ± 2% (at 25 °C) and 4% in full temperature range
• High supply voltage rejection:
•80 dB typ. (at 25 °C)
• Temperature range: 0 °C to 125 °C

简介

LD1117A属于集成电路（IC）的线性+开关稳压器。由制造生产的LD1117A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。