LP3988IMFX-2.85/NOPB屬于集成電路（IC）的線性+開(kāi)關(guān)穩(wěn)壓器。由美國(guó)德州儀器公司制造生產(chǎn)的LP3988IMFX-2.85/NOPB穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無(wú)論負(fù)載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個(gè)最小量，并且在工作時(shí)會(huì)將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對(duì)于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開(kāi)關(guān)模式的穩(wěn)壓器，但它們通常更適合對(duì)噪聲高度敏感的應(yīng)用。

1 Features

1? Input Voltage Range: 2.5 V to 6 V

? Output Current: 150 mA

? PSRR at 10 kHz: 40 dB

? Quiescent Current When Shut Down: ≤ 1μA

? Fast Turnon Time: 100 μs (Typical)

? Dropout With 150-mA load: 80 mV (Typical)

? Junction Temperature Range for Operation:

?40°C to +125°C

? Power-Good Flag Output

? Logic Controlled Enable

? Thermal Shutdown and Short-Circuit Current Limit

? Stable with Ceramic and High-Quality Tantalum

Capacitors

2 Applications

? CDMA Cellular Handsets

? Wideband CDMA Cellular Handsets

? GSM Cellular Handsets

? Portable Information Appliances

? Tiny 3.3 V ± 5% to 2.85 V, 150-mA Converter

3 Description

The LP3988 is a 150-mA low dropout regulator

designed specially to meet requirements of portable battery applications. The LP3988 is designed to work

with space-saving, small 1-μF ceramic capacitors.

The LP3988 features a Power Good (PG) output that

indicates a faulty output condition. The device is ideal for mobile phone and similar battery-powered

wireless applications. It provides up to 150 mA output

current from a 2.5-V to 6-V input, consuming less

than 1 μA in disable mode and has fast turnon time

less than 200 μs.

The LP3988 device's performance is optimized for

battery-powered systems to deliver low noise, extremely low dropout voltage, and low quiescent

current. Regulator ground current increases only

slightly in dropout, further prolonging the battery life.

Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10 kHz. High

power-supply rejection is maintained down to lower

input-voltage levels common to battery-operated

circuits.

The LP3988 is available in a 5-pin SOT-23 package

and a 5-pin thin DSBGA package. Performance is specified for ?40°C to +125°C temperature range. For

all available output voltage and package options, see

the Package Option Addendum (POA) at the end of

the data sheet.