TPS721集成电路（IC）的线性+开关稳压器规格书PDF中文资料

TPS721属于集成电路（IC）的线性+开关稳压器。由德州仪器制造生产的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。

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

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.