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属于集成电路（IC） > 线性 + 开关稳压器。Semtech Corporation制造生产的SC1458AWLTRT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。