LTC3550 - LTC3550是Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter
LTC3550是Linear公司的一款电池充电器和 DC-DC产品，LTC3550是Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter，本站介绍了LTC3550的封装应用图解、特点和优点、功能等，并给出了与LTC3550相关的凌力尔特元器件型号供参考。
LTC3550 - Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter
LTC3550 - Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter - Linear Technology（凌力尔特）
功能描述
The LTC3550 is a standalone linear charger with a 600mA monolithic synchronous buck converter. It is capable of charging a single-cell Li-Ion battery from both wall adapter and USB inputs. The charger automatically selects the appropriate power source for charging.
Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The ?oat voltage is ?xed at 4.2V and the charge currents are programmed with external resistors. The LTC3550 terminates the charge cycle when the charge current drops below the programmed termination threshold after the ?nal ?oat voltage is reached. With power applied to both inputs, the LTC3550 can be put into shutdown mode reducing the DCIN supply current to 20μA, the USBIN supply current to 10μA, and the battery drain current to less than 2μA.
The DC/DC converter switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.
| Vout | LTC3550 Adjustable LTC3550-1 1.875V
特点
Charges Single-Cell Li-Ion Battery from Wall Adapter and USB Inputs Automatic Input Power Detection and Selection Charge Current Programmable Up to 950mA from Wall Adapter Input Adjustable Output, High Efficiency 600mA Synchronous DC/DC Converter No External MOSFET, Sense Resistor or Blocking Diode Needed Thermal Regulation Maximizes Charge Rate Without Risk of Overheating Preset Charge Voltage with ±0.6% Accuracy Programmable Charge Current Termination 1.5MHz Constant Frequency Operation (Step-Down Converter) 18μA USB Suspend Current in Shutdown “Power Present” Status Output Charge Status Output Automatic Recharge Available in a Thermally Enhanced, Low Profile (0.75mm) 16-Lead (5mm × 3mm) DFN Package应用
Cellular Telephones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) |
| LTC3550EDHC | 5x3 DFN-16 | E | $2.86 | $2.00 |
| LTC3550EDHC#PBF | 5x3 DFN-16 | E | $2.86 | $2.00 |
| LTC3550EDHC#TR | 5x3 DFN-16 | E | | $2.06 |
| LTC3550EDHC#TRPBF | 5x3 DFN-16 | E | | $2.06 |
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