描述 Description

The LD49100 provides 1 A maximum current with an input voltage range from 1.5 V to 5.5 V and a typical dropout voltage of 200 mV. The device is stable with ceramic capacitors on the input and output.

The ultra low-dropout voltage, low quiescent current and low-noise features make it suitable for a wide range of automotive applications. Power supply rejection is 70 dB at low frequency and starts to roll off at 10 kHz. Enable logic control function puts the LD49100 in shutdown mode, allowing a total current consumption lower than 1 μA.

The device features a precise Power Good indicator, useful to monitor and sequence functions. Internal 1 ms soft-start circuit allows the reduction of inrush current.

The device includes the short-circuit constant current limiting and thermal protection. The LD49100 is available in AEC-Q100 grade 1 qualified version, in a small 6-pin DFN6 (3x3 mm) with wettable flank package.

特性 Features

? AEC-Q100 qualified
? Temperature range: -40?°C to 125?°C
? Input voltage from 1.5 to 5.5?V
? Ultra low-dropout voltage (200?mV typ. at 1?A load)
? Very low quiescent current (20?μA typ. at no load, 200?μA typ. at 1?A load, 1?μA max. in off mode)
? Very low-noise with no bypass capacitor (30?μVRMS at VOUT?=?0.8?V)
? Output voltage tolerance: ± 2.0% at 25?°C
? 1 A guaranteed output current
? Wide range of output voltages available on request: 0.8?V to 4.5?V with 100?mV step and adjustable from 0.8 V
? Logic-controlled electronic shutdown
? Power Good function
? Stable with ceramic capacitors COUT?=?1?μF
? Internal current and thermal limit
? DFN6 (3x3?mm) package with wettable flanks

簡介

LD49100屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由制造生產(chǎn)的LD49100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。