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.

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

LD2985BM18R属于集成电路（IC） > 线性 + 开关稳压器。意法半导体（ST）集团制造生产的LD2985BM18R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。