LTC1911 - LTC1911是Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
LTC1911是Linear公司的一款稳压的降压型充电泵产品，LTC1911是Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter，本站介绍了LTC1911的封装应用图解、特点和优点、功能等，并给出了与LTC1911相关的凌力尔特元器件型号供参考。
LTC1911 - Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
LTC1911-1.5 - Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter - Linear Technology（凌力尔特）
功能描述
The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary.* Typical efficiency is over 25% higher than that of a linear regulator.
A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency, the part enters Burst Mode operation under light load conditions.
Low operating current (180μA with no load, 10μA in shutdown) and low external parts count (two 1μF flying capacitors and two 10μF bypass capacitors) make the LTC1911 ideally suited for space constrained batterypowered applications. The part is short-circuit and overtemperature protected, and is available in an 8-pin MSOP package.
特点
Low Noise Constant Frequency Operation 2.7V to 5.5V Input Voltage Range No Inductors Typical Efficiency 25% Higher Than LDOs Shutdown Disconnects Load from VIN Output Voltage: 1.8V ±4% or 1.5V ±4% Output Current: 250mA Low Operating Current: IIN = 180μA Typ Low Shutdown Current: IIN = 10μA Typ Oscillator Frequency: 1.5MHz Soft-Start Limits Inrush Current at Turn On Short-Circuit and Overtemperature Protected Available in an 8-Pin MSOP Package应用
Handheld Computers Cellular Phones Smart Card Readers Portable Electronic Equipment Handheld Medical Instruments Low Power DSP Supplies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) |
| LTC1911EMS8-1.5 | MS-8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.5#PBF | MS-8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.5#TR | MS-8 | E | | $2.40 |
| LTC1911EMS8-1.5#TRPBF | MS-8 | E | | $2.40 |
| LTC1911EMS8-1.8 | MS-8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.8#PBF | MS-8 | E | $2.77 | $2.34 |
| LTC1911EMS8-1.8#TR | MS-8 | E | | $2.40 |
| LTC1911EMS8-1.8#TRPBF | MS-8 | E | | $2.40 |
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