LP3990QTLX-2.8Q1屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由美國(guó)德州儀器公司制造生產(chǎn)的LP3990QTLX-2.8Q1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? Qualified for Automotive Applications

? AEC-Q100 Qualified With the Following Results

– Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

Range

? Input Voltage Range: 2 V to 6 V

? 1% Voltage Accuracy at Room Temperature

? Output Voltage Range: 0.8 V to 3.3 V

? Output Current: 150 mA

? Logic Controlled Enable

? Thermal-Overload and Short-Circuit Protection

? Virtually Zero I Q (Disabled), < 10 nA

? Very Low IQ (Enabled): 43 μA

? Low Output Noise: 150 μVRMS

? PSRR: 55 dB at 1 kHz

? Fast Start-Up: 105 μs

? Stable with Ceramic Capacitor

? Output Stable - Capacitors, 1 μF

? No Noise Bypass Capacitor Required

2 Applications

? Infotainment

? Instrumentation

? Body Electronics

3 Description

The LP3990-Q1 regulator is designed to meet the

requirements of portable, battery-powered systems providing an accurate output voltage, low-noise, and

low-quiescent current. The LP3990-Q1 will provide a

0.8-V output from the low input voltage of 2 V at up to

a 150-mA load current. When switched into shutdown

mode via a logic signal at the enable pin (EN), the

power consumption is reduced to virtually zero.

The LP3990-Q1 is designed to be stable with spacesaving

ceramic capacitors with values as low as 1 μF.

Performance is specified for a –40°C to +125°C junction temperature range.

For output voltage options please refer to package

option addendum (POA) or contact the Texas

Instruments Sales Office.