LD2985BM18R屬于集成電路（IC）的線性+開關穩(wěn)壓器。由意法半導體集團制造生產(chǎn)的LD2985BM18R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)應用而言，雖然這種穩(wěn)壓器的效率低于開關模式的穩(wěn)壓器，但它們通常更適合對噪聲高度敏感的應用。

描述 Description

The LD2985A/Bxx is a 150 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 μA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption.

An external capacitor, CBYP = 10 nF, connected between bypass pin and GND reduce the noise to 30 μVrms.

Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

特性 Features

■ Very low dropout voltage (280 mV at 150 mA and 7 mV at 1 mA load)

■ Very low quiescent current (2 mA typ. at 150 mA load and 80 μA at no load)

■ Output current up to 150 mA

■ Logic controlled electronic shutdown

■ Output voltage of 1.8, 2.5, 2.7, 2.8, 3, 3.3, 5 V

■ Internal current and thermal limit

■ Available in ± 1.5 tolerance (at 25 °C, A version)

■ Low output noise voltage 30 mVrms

■ Smallest package SOT23-5L

■ Temperature range: - 40°C to 125 °C