LTC3541-3 - LTC3541-3是High Efficiency Buck + VLDO Regulator

LTC3541-3是LINEAR凌力尔特公司的一款内部开关电源降压产品，LTC3541-3是LTC3541-3是High Efficiency Buck + VLDO Regulator，本站介绍了LTC3541-3的封装应用图解、特点和优点、功能等，并给出了与LTC3541-3相关的LINEAR元器件型号供参考。

LTC3541-3 - LTC3541-3是High Efficiency Buck + VLDO Regulator - 内部开关电源降压 - 电源管理 - 凌力尔特

LTC3541-3 - High Efficiency Buck + VLDO Regulator

LTC3541-3 - High Efficiency Buck + VLDO Regulator - Linear Technology（凌力尔特）

功能描述

The LTC3541-3 combines a synchronous buck DC/ DC converter with a very low dropout linear regulator (VLDOTM regulator) and internal feedback resistor networks to provide two output voltages from a single input voltage with minimum external components. When configured for dual output operation, the LTC3541-3’s auto start-up feature will bring the 1.575V VLDO/linear regulator output into regulation in a controlled manner prior to enabling the 1.8V buck output without the need for external pin control. The 300mA VLDO/linear regulator output will source only 30mA until the buck output achieves regulation. The input voltage range is ideally suited for applications powered from a Li-Ion battery and 5V or 3.3V rails.

The synchronous buck converter provides a high efficiency 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 efficiency 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 or a separate supply.

OptionsVout Switcher (V)Vout VLDOAuto Start Up Sequencing LTC3541 Adj down to 0.8V Adj down to 0.4V Switcher, then VLDO LTC3541-1 Adj down to 0.8V Adj down to 0.4V VLDO, then switcher LTC3541-2 1.875V fixed 1.5V fixed Switcher, then VLDO LTC3541-3 1.8V fixed 1.575 fixed VLDO, then switcher

特点

High Efficiency 500mA Buck Plus 300mA VLDO Regulator

Auto Start-Up Powers VLDO/Linear Regulator Output Prior to Buck 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: 1.8V

VLDO Input Voltage Range (LVIN: 1.675V to 5.5V)

Fixed VLDO Output Voltage: 1.575V

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

Short-Circuit Protected

Current Mode Operation for Excellent Line and Load Transient Response