LTC3552-1 - LTC3552-1是Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
LTC3552-1是Linear公司的一款电池充电器和 DC-DC产品，LTC3552-1是Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter，本站介绍了LTC3552-1的封装应用图解、特点和优点、功能等，并给出了与LTC3552-1相关的凌力尔特元器件型号供参考。
LTC3552-1 - Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
LTC3552-1 - Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter - Linear Technology（凌力尔特）
功能描述
The LTC3552-1 is a complete constant-current/constantvoltage linear charger and dual fi xed output DC/DC converter for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC3552-1 ideally suited for portable applications. Furthermore, the LTC3552-1 is designed to work within USB power specifi cations.
No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. The charge voltage is fixed at 4.2V and the charge current is programmed with a resistor. The charge cycle terminates when the charge current drops below the programmed termination threshold after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LTC3552-1 enters a low current state dropping the battery drain current to less than 2μA. Thermal regulation maximizes charge rate without risk of overheating.
The synchronous step-down switching regulators generate fi xed output voltages of 1.8V and 1.575V. The switching frequency is set at 2.25MHz, allowing the use of small surface mount inductors and capacitors.
| Vout | LTC3552Adjustable (0.6V to 5V)LTC3552-11.8V & 1.575V
特点
Programmable Charge Current Up to 950mA Complete Linear Charger and Dual DC/DC Regulator Dual Fixed Outputs:1.8V at 800mA1.575V at 400mA No MOSFET, Sense Resistor or Blocking Diode Required Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* Charges Directly from a USB Port Programmable Charge Current Termination Preset 4.2V Charge Voltage with ±1% Accuracy Charge Current Monitor Output for Gas Gauging Automatic Recharge Charge Status Output “Power Present” Output Soft-Start Limits Inrush Current Low Quiescent Current Buck Converter (40μA) Current Mode Operation, Constant Frequency (2.25MHz) Low Profi le (5mm × 3mm × 0.75mm) DFN Package应用
Cellular Telephones, PDAs, MP3 Players Bluetooth Applications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) |
| LTC3552EDHC-1 | 5x3 DFN-16 | E | $3.29 | $2.30 |
| LTC3552EDHC-1#PBF | 5x3 DFN-16 | E | $3.29 | $2.30 |
| LTC3552EDHC-1#TR | 5x3 DFN-16 | E | | $2.36 |
| LTC3552EDHC-1#TRPBF | 5x3 DFN-16 | E | | $2.36 |
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