LTC3541 - LTC3541是High Efficiency Buck + VLDO Regulator

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

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

LTC3541 - High Efficiency Buck + VLDO Regulator

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

功能描述

The LTC3541 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 synchronous buck converter provides a high efficiency output, typically 90%, capable of providing up to 500mA of continuous 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 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.

OptionsVout Switcher (V)Vout VLDOAuto Start Up SequencingLTC3541Adj down to 0.8VAdj down to 0.4VSwitcher, then VLDOLTC3541-1Adj down to 0.8VAdj down to 0.4VVLDO, then switcherLTC3541-21.875V fixed1.5V fixedSwitcher, then VLDOLTC3541-31.8V fixed1.575 fixedVLDO, then switcher

特点

High Efficiency, 500mA Buck Plus 300mA VLDO Regulator

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

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

300mA VLDO Regulator with 30mA Standalone Mode

No External Schottky Diodes Required

Buck Output Voltage Range: 0.8V to 5V

VLDO Input Voltage Range (LVIN): 0.9V to 5.5V

VLDO Output Voltage Range VLDO: 0.4V to 4.1V

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

Short-Circuit Protected

Current Mode Operation for Excellent Line and Load