LP3874EMPX-1.8/NOPB集成电路（IC）的线性+开关稳压器规格书PDF中文资料

LP3874EMPX-1.8/NOPB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LP3874EMPX-1.8/NOPB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。

1 Features

1• Input Voltage: 2.5 V to 7 V

• Ultra-Low-Dropout Voltage

• Low Ground Pin Current

• Load Regulation of 0.04%

• 10-nA Quiescent Current in Shutdown Mode

• Specified Output Current of 0.8-A DC

• Output Voltage Accuracy ±1.5%

• ERROR Flag Indicates Output Status

• SENSE Option Improves Load Regulation

• Minimum Output Capacitor Requirements

• Overtemperature/Overcurrent Protection

• −40°C to +125°C Junction Temperature Range

2 Applications

• Microprocessor Power Supplies

• GTL, GTL+, BTL, and SSTL Bus Terminators

• Power Supplies for DSPs

• SCSI Terminator

• Post Regulators

• High-Efficiency Linear Regulators

• Battery Chargers

• Other Battery-Powered Applications

3 Description

The LP3871 and LP3874 series of fast ultra-low-

dropout linear regulators operate from a 2.5-V to 7-V input supply. Wide range of preset output voltage

options are available. These ultra-low-dropout linear

regulators respond very quickly to step changes in

load, which makes them suitable for low voltage microprocessor applications. The devices are

developed on a CMOS process which allows low

quiescent current operation independent of output

load current. This CMOS process also allows the

LP3871 and LP3874 to operate under extremely low dropout conditions.

Dropout Voltage: Ultra-low-dropout voltage; typically

24 mV at 80-mA load current and 240 mV at 0.8-A

load current.

Ground Pin Current: Typically 6 mA at 0.8-A load current.

Shutdown Mode: Typically 10-nA quiescent current

when the SD pin is pulled low.

ERROR Flag: ERROR flag goes low when the output

voltage drops 10% below nominal value.

SENSE: SENSE pin improves regulation at remote

loads.

Precision Output Voltage: Multiple output voltage

options are available ranging from 1.8 V to 5 V with a

ensured accuracy of ±1.5% at room temperature, and

±3% over all conditions (varying line, load, and

temperature).