LTC3403 - LTC3403是1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor
LTC3403是Linear公司的一款微功率降压产品，LTC3403是1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor，本站介绍了LTC3403的封装应用图解、特点和优点、功能等，并给出了与LTC3403相关的凌力尔特元器件型号供参考。
LTC3403 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor
LTC3403 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor - Linear Technology（凌力尔特）
功能描述
The LTC3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input.
Supply current is only 20µA in Burst Mode operation and drops to <1µA in shutdown. The 2.5V to 5V input voltage range makes the LTC3403 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.
The LTC3403 is available in a low profile 8-lead 3mm x 3mm DFN package.
特点
Dynamically Adjustable Output from 0.3V to 3.5V Very Low Quiescent Current: Only 20µA During Operation 600mA Output Current Internal P-Channel MOSFET Bypass Transistor High Efficiency: Up to 96% 1.5MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle 2.5V to 5V Input Voltage Range Drives Optional External P-Channel MOSFET Shutdown Mode Draws < 1µA Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Available in 8-Lead 3mm x 3mm DFN Package应用
WCDMA Cell Phone Power Amplifiers Wireless Modems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) |
| LTC3403EDD | 3x3 DFN-8 | E | $3.00 | $2.10 |
| LTC3403EDD#PBF | 3x3 DFN-8 | E | $3.00 | $2.10 |
| LTC3403EDD#TR | 3x3 DFN-8 | E | | $2.20 |
| LTC3403EDD#TRPBF | 3x3 DFN-8 | E | | $2.20 |
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