LTC3421 - LTC3421是3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect
LTC3421是Linear公司的一款微功率升压产品，LTC3421是3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect，本站介绍了LTC3421的封装应用图解、特点和优点、功能等，并给出了与LTC3421相关的凌力尔特元器件型号供参考。
LTC3421 - 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect
LTC3421 - 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect - Linear Technology（凌力尔特）
功能描述
The LTC3421 is a high efficiency, current mode, fixed frequency, step-up DC/DC converter with true output disconnect and inrush current limiting. The device includes a 0.10 Ohm N-channel MOSFET switch and a 0.14 Ohm P-channel synchronous rectifier. This product has the ability to simply program the output voltage, switching frequency, current limit, soft-start, Burst Mode threshold and loop compensation with external passive components.
Quiescent current is only 12µA during Burst Mode operation, maximizing battery life in portable applications. The oscillator frequency can be programmed up to 3MHz and can be synchronized to an external clock applied to the SYNC pin. An open-drain uncommitted low-battery comparator is included. The part maintains operation in applications with a secondary cell powering the output voltage during shutdown.
Other features include: 1µA shutdown, antiringing control, thermal limit and reference output.
The LTC3421 is available in a small 4mm x 4mm QFN package.
特点
Synchronous Rectification: Up to 96% Efficiency True Output Disconnect Inrush Current Limiting Very Low Quiescent Current: 12µA Up to 1.5A Continuous Output Current Fixed Frequency Operation Up to 3MHz 0.5V to 4.5V Input Range 2.4V to 5.25V Adjustable Output Voltage Guaranteed 1V Start-Up Programmable Current Limit Programmable Soft-Start Synchronizable Oscillator Manual or Automatic Burst Mode Operation Low-Battery Comparator <1µA Shutdown Current 1.22V Reference Output Voltage Small (4mm x 4mm) Thermally Enhanced QFN Package应用
Handheld Computers Cordless Phones GPS Receivers Battery Backup 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) |
| LTC3421EUF | 4x4 QFN-24 | E | $5.00 | $3.50 |
| LTC3421EUF#PBF | 4x4 QFN-24 | E | $5.00 | $3.50 |
| LTC3421EUF#TR | 4x4 QFN-24 | E | | $3.60 |
| LTC3421EUF#TRPBF | 4x4 QFN-24 | E | | $3.60 |
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