LTC1773 - LTC1773是Synchronous Step-Down DC/DC Controller
LTC1773是Linear公司的一款外部开关电源控制器产品，LTC1773是Synchronous Step-Down DC/DC Controller，本站介绍了LTC1773的封装应用图解、特点和优点、功能等，并给出了与LTC1773相关的凌力尔特元器件型号供参考。
LTC1773 - Synchronous Step-Down DC/DC Controller
LTC1773 - Synchronous Step-Down DC/DC Controller - Linear Technology（凌力尔特）
功能描述
The LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.
The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.
Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package.
特点
High Efficiency: Up to 95% Constant Frequency 550kHz Operation VIN from 2.65V to 8.5V VOUT from 0.8V to VIN OPTI-LOOP? Compensation Minimizes COUT Synchronizable up to 750kHz Selectable Burst Mode Operation Low Quiescent Current: 80μA Low Dropout Operation: 100% Duty Cycle Secondary Winding Regulation Soft-Start Current Mode Operation for Excellent Line and Load Transient Response Low Quiescent Current: 80μA Low Shutdown IQ = 10μA ±1.5% Reference Accuracy Precision 2.5V Undervoltage Lockout Available in 10-Lead MSOP应用
Cellular Telephones RF PA Supply Portable Instruments Wireless MODEMS Distributed Power Systems Notebook and Palm Top Computers, PDAs Single and Dual Cell Lithium-Ion Powered Devices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) |
| LTC1773EMS | MS-10 | E | $2.90 | $2.50 |
| LTC1773EMS#PBF | MS-10 | E | $2.90 | $2.50 |
| LTC1773EMS#TR | MS-10 | E | | $2.56 |
| LTC1773EMS#TRPBF | MS-10 | E | | $2.56 |
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