LT LTC3541EDD-3#PBF

Понижающий (Buck) синхронный (1), линейный (LDO) (1)20,8 В ~ 5 В, 500 мА0,9 В ~ 5,5 В

Overview

The LTC3541EDD combines a synchronous buck DC/DC converter with a very low dropout linear regulator (VLDO) to provide up to two output voltages from a single input voltage with minimal external components. When configured for dual output operation, the LTC3541’s auto start-up feature will bring the Buck output into regulation in a controlled manner prior to enabling the VLDO regulator output without the need for external pin control. VLDO/linear regulator output prior to Buck output sequencing may also be obtained via external pin control. The input voltage range is ideally suited for Li-Ion battery-powered applications, as well as powering sub-3.3V logic from 5V or 3.3V rails.

The VLDO regulator provides a low noise, low voltage output capable of providing up to 300mA of continuous output current using only a 2.2μF ceramic capacitor. The input supply voltage of the VLDO regulator (LVIN) may come from the buck regulator or a separate supply.

Features

Applications

• Constant high-current source
• Low parts count 5.0V to 3.3V computer supply
• Low noise SMPS post regulator
• Low-dropout SMPS post regulator
• High-current, current-limited switch
• Dual/Triple Power Supplies
• Desknotes and Notebooks
• Graphic Cards
• Ultra-Low-Dropout
• Voltage Regulators