LTC3541 - LTC3541是High Efficiency Buck + VLDO Regulator
LTC3541是Linear公司的一款内部开关电源降压产品，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相关的凌力尔特元器件型号供参考。
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.
Options | Vout Switcher (V) | Vout VLDO | Auto Start Up Sequencing | LTC3541Adj 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 Transient Response Constant Frequency Operation: 2.25MHz Low Dropout Buck Operation: 100% Duty Cycle Small, Thermally Enhanced, 10-Lead (3mm × 3mm) DFN Package应用
PDAs/Palmtop PCs Digital Cameras Cellular Phones PC Cards Wireless and DSL Modems Other Portable Power Systems以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
| 器件型号 | 封装 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) |
| LTC3541EDD#PBF | 3x3 DFN-10 | E | $2.70 | $1.89 |
| LTC3541EDD#TRPBF | 3x3 DFN-10 | E | | $1.95 |
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