LTC3552 - LTC3552是Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
LTC3552是Linear公司的一款电池充电器和 DC-DC产品，LTC3552是Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter，本站介绍了LTC3552的封装应用图解、特点和优点、功能等，并给出了与LTC3552相关的凌力尔特元器件型号供参考。
LTC3552 - Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
LTC3552 - Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter - Linear Technology（凌力尔特）
功能描述
The LTC3552 is a complete constant-current/constantvoltage linear charger with a dual DC/DC converter for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC3552 ideally suited for portable applications. Furthermore, the LTC3552 is designed to work within USB power speci? cations.
No external sense resistor or external blocking diode is required due to the internal MOSFET architecture. The charge voltage is ?xed 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 ?nal ?oat voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LTC3552 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 adjustable output voltages from 5V down to 0.6V. The switching frequency is set at 2.25MHz, allowing the use of small surface mount inductors and capacitors.
| Vout | LTC3552 Adjustable (0.6V to 5V) LTC3552-1 1.8V & 1.575V
特点
高达 950mA 的可设置充电电流 完整的线性充电器和双信道 DC/DC 稳压器 0.6V 至 5V 的降压型转换器输出电压 无需 MOSFET、检测电阻器或隔断二极管 热调整功能可在无过热危险的情况下实现充电速率的最大化* 直接从一个 USB 端口进行充电 可设置充电电流终止 准确度达 ±1% 的 4.2V 预设充电电压 用于电池电量测量的充电电流监视器输出* 自动再充电 充电状态输出 “电源接入”输出 2.9V 涓流充电门限 软起动功能限制了浪涌电流 低静态电流降压型转换器 (40μA) 电流模式操作，恒定频率 (2.25MHz) 扁平 (5mm x 3mm x 0.75mm) DFN 封装应用
蜂窝电话、PDA、MP3 播放机 蓝牙应用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 | 5x3 DFN-16 | E | $3.29 | $2.30 |
| LTC3552EDHC#PBF | 5x3 DFN-16 | E | $3.29 | $2.30 |
| LTC3552EDHC#TR | 5x3 DFN-16 | E | | $2.36 |
| LTC3552EDHC#TRPBF | 5x3 DFN-16 | E | | $2.36 |
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