LTC3549 - LTC3549是250mA Low VIN Buck Regulator in 2mm x 3mm DFN
LTC3549是Linear公司的一款微功率降压产品，LTC3549是250mA Low VIN Buck Regulator in 2mm x 3mm DFN，本站介绍了LTC3549的封装应用图解、特点和优点、功能等，并给出了与LTC3549相关的凌力尔特元器件型号供参考。
LTC3549 - 250mA Low VIN Buck Regulator in 2mm x 3mm DFN
LTC3549 - 250mA Low VIN Buck Regulator in 2mm x 3mm DFN - Linear Technology（凌力尔特）
功能描述
The LTC3549 is a high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The output voltage is adjusted via an external resistor divider.
A fixed switching frequency of 2.25MHz is supported. This switching frequency allows the use of small surface mount inductors and capacitors, including ceramics.
Supply current during Burst Mode operation is only 50µA dropping to < 1µA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3549 ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.
特点
1.6V to 5.5V Input Voltage Range Internal Soft-Start Low Ripple Burst Mode Operation Output Ripple: <20mVP-P IQ: 50µA 2.25MHz Constant-Frequency Operation High Ef? ciency: Up to 93% 250mA Output Current (VIN = 1.8V, VOUT = 1.2V) 450mA Peak Inductor Current No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle 0.611V Reference Voltage Stable with Ceramic Capacitors Shutdown Mode Draws <1µA Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protection Available in a Low Pro? le (0.75mm) 6-Lead (2mm x 3mm) DFN Package应用
2 AA-Cell Applications Cellular Phones Digital Cameras MP3 Players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) |
| LTC3549EDCB#PBF | 2x3 DFN-6 | E | $2.06 | |
| LTC3549EDCB#TRMPBF | 2x3 DFN-6 | E | $2.06 | $1.49 |
| LTC3549EDCB#TRPBF | 2x3 DFN-6 | E | $2.06 | $1.44 |
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