LT3431 - LT3431是High Voltage, 3A, 500kHz Step-Down Switching Regulator
LT3431是Linear公司的一款内部开关电源降压产品，LT3431是High Voltage, 3A, 500kHz Step-Down Switching Regulator，本站介绍了LT3431的封装应用图解、特点和优点、功能等，并给出了与LT3431相关的凌力尔特元器件型号供参考。
LT3431 - High Voltage, 3A, 500kHz Step-Down Switching Regulator
LT3431 - High Voltage, 3A, 500kHz Step-Down Switching Regulator - Linear Technology（凌力尔特）
功能描述
The LT3431 is a 500kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1 Ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.
Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and the device can be externally synchronized from 580kHz to 700kHz with logic level inputs.
The LT3431 is available in a thermally enhanced 16-pin TSSOP package.
特点
Wide Input Range: 5.5V to 60V 3A Peak Switch Current Small Thermally Enhanced 16-Pin TSSOP Package Constant 500kHz Switching Frequency Saturating Switch Design: 0.1 Ohm Peak Switch Current Maintained Over Full Duty Cycle Range Effective Supply Current: 2.5mA Shutdown Current: 30µA 1.2V Feedback Reference Voltage Easily Synchronizable Cycle-by-Cycle Current Limiting应用
Industrial and Automotive Power Supplies Portable Computers Battery Chargers Distributed 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) |
| LT3431EFE | TSSOP-16 | E | $7.07 | $4.95 |
| LT3431EFE#PBF | TSSOP-16 | E | $7.07 | $4.95 |
| LT3431EFE#TR | TSSOP-16 | E | | $5.07 |
| LT3431EFE#TRPBF | TSSOP-16 | E | | $5.07 |
| LT3431IFE | TSSOP-16 | I | $8.13 | $5.69 |
| LT3431IFE#PBF | TSSOP-16 | I | $8.13 | $5.69 |
| LT3431IFE#TR | TSSOP-16 | I | | $5.81 |
| LT3431IFE#TRPBF | TSSOP-16 | I | | $5.81 |
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