LK112SM55TR集成電路（IC）的線性+開關(guān)穩(wěn)壓器規(guī)格書PDF中文資料

LK112SM55TR屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由意法半導體集團制造生產(chǎn)的LK112SM55TR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(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。

Description

The LK112Sxx is a low dropout linear regulator with a built in electronic switch. The internal switch can be controlled by TTL or CMOS logic levels. The device is ON state when the control pin is pulled to a logic high level. An external capacitor can be used connected to the noise bypass pin to lower the output noise level to 30 μVrms. An internal PNP pass transistor is used to achieve a low dropout voltage.

The LK112Sxx has a very low quiescent current in ON MODE while in OFF MODE the Iq is reduced down to 100 nA max. The internal thermal shutdown circuitry limits the junction temperature to below 150 °C. The load current is internally monitored and the device will shutdown in the presence of a short circuit or overcurrent condition at the output.

Features

■ Output current up to 200 mA

■ Low dropout voltage (500 mV max at IOUT = 200 mA)

■ Very low quiescent current: 0.1 μA in OFF mode and max 250 μA in ON mode at IOUT = 0 mA

■ Low output noise: typ 30 μV at IOUT = 60 mA and 10 Hz < f < 80 kHz

■ Wide range of output voltages

■ Internal current and thermal limit

■ VOUT tolerance ± 2 (at 25 °C)

■ Operative input voltage from: VOUT+0.5 to 14 V (for VOUT > 2 V) or from 2.5 V to 14 V (for VOUT