Description

The SC1458 is a family of dual output, ultra-low dropout linear voltage regulators designed for use in battery powered wireless applications. Both versions of the SC1458 require an input voltage level between 2.5V and 5.5V. The SC1458A supplies 2.5V on OUTA and 1.8V on OUTB, while SC1458B supplies 2.85V on both outputs. (For other voltage options see the SC560).

Features

■ Input voltage range — 2.5 to 5.5V

■ Output voltages — 2.8V and 1.8V (SC1458A), 2.85V and 2.85V (SC1458B)

■ Maximum output current — 300mA (each LDO)

■ Low 200mV maximum dropout at 200mA load

■ Quiescent current — 100μA (both LDOs enabled)

■ Shutdown current — 100nA

■ Output noise < 50μVRMS (SC1458B)

■ PSRR > 65dB at 1kHz (SC1458B)

■ Space saving package — MLPD-W6, 3mm x 3mm

■ Over-temperature protection

■ Short-circuit protection

■ Under-voltage lockout

■ Reset monitor for output A (SC1458A)

Applications

■ PDAs and cellular phones

■ GPS devices

■ Palmtop computers and handheld instruments

■ TFT/LCD applications

■ Wireless handsets

■ Digital cordless phones and PCS phones

■ Personal communicators

■ Two-way pagers

■ Wireless LAN

SC1458AWLTRT屬于集成電路（IC） > 線性 + 開(kāi)關(guān)穩(wěn)壓器。Semtech Corporation制造生產(chǎn)的SC1458AWLTRT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(wú)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(gè)最小量，并且在工作時(shí)會(huì)將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對(duì)于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開(kāi)關(guān)模式的穩(wěn)壓器，但它們通常更適合對(duì)噪聲高度敏感的應(yīng)用。