LTC3541-2 - LTC3541-2是High Efficiency Buck + VLDO Regulator

LTC3541-2是LINEAR凌力尔特公司的一款内部开关电源降压产品，LTC3541-2是LTC3541-2是High Efficiency Buck + VLDO Regulator，本站介绍了LTC3541-2的封装应用图解、特点和优点、功能等，并给出了与LTC3541-2相关的LINEAR元器件型号供参考。

LTC3541-2 - LTC3541-2是High Efficiency Buck + VLDO Regulator - 内部开关电源降压 - 电源管理 - 凌力尔特

LTC3541-2 - High Efficiency Buck + VLDO Regulator

LTC3541-2 - High Efficiency Buck + VLDO Regulator - Linear Technology（凌力尔特）

功能描述

The LTC3541-2 combines a synchronous buck DC/ DC converter with a very low dropout linear regulator (VLDO regulator) and internal feedback resistor networks to provide two output voltages from a single input voltage with minimal external components. When configured for dual output operation, the LTC3541-2’s auto start-up feature will bring the 1.875V buck output into regulation in a controlled manner, prior to enabling the 1.5V VLDO output without the need for external pin control. The 1.5V VLDO/linear regulator output prior to 1.875V buck output sequencing may also be obtained via external pin control. The input voltage range is ideally suited for Li-Ion battery applications powering sub-3.3V logic from 5V or 3.3V rails.

The synchronous buck converter provides a high effi ciency output, typically 90%. It can provide up to 500mA of output current while switching at 2.25MHz, allowing the use of small surface mount inductors and capacitors. A mode select pin allows Burst Mode operation to be enabled for higher effi ciency at light load currents, or disabled for lower noise, constant frequency operation.

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

特点

High Efficiency, 500mA Buck Plus 300mA VLDO Regulator

Auto Start-Up Powers Buck Output Prior to VLDO/ Linear Regulator Output

Independent 500mA High Efficiency Buck (VIN: 2.7V to 5.5V)

300mA VLDO Regulator with 30mA Standalone Mode

No External Schottky Diodes Required

Fixed Buck Output Voltage: 1.875V

VLDO Input Voltage Range (LVIN: 1.6V to 5.5V)

Fixed VLDO Output Voltage: 1.5V

Selectable Fixed Frequency, Pulse-Skip Operation or Burst Mode Operation

Short-Circuit Protected

Current Mode Operation for Excellent Line and Load Transient Response