TPS721中文资料具有使能功能的 150mA、低压降稳压器数据手册TI规格书

描述 Description

The TPS721xx family of LDO regulators is available in fixed voltage options that are commonly used to power the latest DSPs and microcontrollers with an adjustable option ranging from 1.22 V to 2.5 V. These regulators can be used in a wide variety of applications ranging from portable, battery-powered equipment to PC peripherals. The family features operation over a wide range of input voltages (1.8 V to 5.5 V) and low dropout voltage (150 mV at full load). Therefore, compared to many other regulators that require 2.5-V or higher input voltages for operation, these regulators can be operated directly from two AAA batteries. Also, the typical quiescent current (ground pin current) is low, starting at 85 µA during normal operation and 1 µA in shutdown mode. These regulators can be operated very efficiently and, in a battery-powered application, help extend the longevity of the device. Similar LDO regulators require 1-µF or larger output capacitors for stability. However, this regulator uses an internal compensation scheme that stabilizes the feedback loop over the full range of input voltages and load currents with output capacitances as low as 0.1-µF. Ceramic capacitors of this size are relatively inexpensive and available in small footprints. This family of regulators is particularly suited as a portable power supply solution due to its minimal board space requirement and 1.8-V minimum input voltage. Being able to use two off-the-shelf AAA batteries makes system design easier and also reduces component cost. Moreover, the solution will be more efficient than if a regulator with a higher input voltage is used.

特性 Features

• 150-mA LDO
• Available in 1.5-V, 1.6-V, 1.8-V Fixed-Output and Adjustable (1.2-V to 2.5-V) Versions
• Low Input Voltage Requirement (Down to 1.8 V)
• Small Output Capacitor, 0.1-µF
• Dropout Voltage Typically 200 mV at 150 mA
• Less Than 1 µA Quiescent Current in Shutdown Mode
• Thermal Protection
• Over Current Limitation
• 5-Pin SOT-23 (DBV) Package
• APPLICATIONS
• Portable Communication Devices
• Battery Powered Equipment
• PCMCIA Cards
• Personal Digital Assistants
• Modems
• Bar Code Scanners
• Backup Power Supplies
• SMPS Post Regulation
• Internet Audio

简介

TPS721属于集成电路（IC）的线性+开关稳压器。由TI制造生产的TPS721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。