LP3990MFX-3.3/NOPB屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由美國德州儀器公司制造生產(chǎn)的LP3990MFX-3.3/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，而且要超出某個最小量，并且在工作時會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(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噪聲高度敏感的應(yīng)用。

1 Features

1? 1% Voltage Accuracy at Room Temperature

? Stable with Ceramic Capacitor

? Logic Controlled Enable

? No Noise Bypass Capacitor Required

? Thermal-Overload and Short-Circuit Protection

? Input Voltage Range, 2 V to 6 V

? Output Voltage Range, 0.8 V to 3.3 V

? Output Current, 150 mA

? Output Stable - Capacitors, 1 μF

? Virtually Zero IQ (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

2 Applications

? Cellular Handsets

? Hand-Held Information Appliances

3 Description

The LP3990 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 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 is designed to be stable with space-

saving ceramic capacitors with values as low as 1 μF.

Performance is specified for a –40°C to 125°C

junction temperature range.

For output voltages other than 0.8 V, 1.2 V, 1.35 V,

1.5 V, 1.8 V, 2.5 V, 2.8 V, or 3.3 V, please contact

the Texas Instruments sales office.