LTC4054-4.2 采用 ThinSOT 封装并具有热调节功能的独立线性锂离子电池充电器

LTC4054 是一款完整的单节锂离子电池用恒定电流/恒定电压线性充电器。其 ThinSOT 封装与较少的外部组件数目使得 LTC4054 成为便携式应用的理想选择。而且，LTC4054 是专为在 USB 电源规范内工作而设计的。

由于采用了内部 MOSFET 架构，所以不需要外部检测电阻器和隔离二极管。热反馈可对充电电流进行调节，以便在大功率操作或高环境温度条件下对芯片温度加以限制。充电电压固定于 4.2V，而充电电流可通过一个电阻器进行外部设置。当充电电流在达到最终浮充电压之后降至设定值的 1/10 时，LTC4054 将自动终止充电循环。

当输入电压 (交流适配器或 USB 电源) 被拿掉时，LTC4054 自动进入一个低电流状态，将电池漏电流降至 2µA 以下。可将 LTC4054 置于停机模式，从而将供电电流降至 25µA。

LTC4054 的其它特点包括充电电流监控器、欠压闭锁、自动再充电和一个用于指示充电结束和输入电压接入的状态引脚。

The LTC4054 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications.

No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LTC4054 automatically enters a low current state, dropping the battery drain current to less than 2mA.

The LTC4054 can be put into shutdown mode, reducing the supply current to 25mA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.

LTC4054-4.2 特点 Features

高达 800mA 的可编程充电电流
无需 MOSFET、检测电阻器或隔离二极管
用于单节锂离子电池、采用 ThinSOTTM 封装的完整线性充电器
恒定电流/恒定电压操作，并具有可在无过热危险的情况下实现充电速率最大化的热调节功能*
直接从 USB 端口给单节锂离子电池充电
精度达 ± 1% 的 4.2V 预设充电电压
用于电池电量检测的充电电流监控器输出*
自动再充电
充电状态输出引脚
C/10 充电终止
停机模式下的供电电流为 25µA
2.9V 涓流充电门限 (LTC4054)
可提供无涓流充电器件版本 (LTC4054X)
软起动限制了浪涌电流
采用 5 引脚 SOT-23 封装

Click Here For LTC4054-4.2 Evaluation Kit
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode Required
Complete linear Charger in ThinSOT™ Package for Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly from USB Port
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25µA Supply Current in Shutdown
2.9V Trickle Charge Threshold (LTC4054)
Available Without Trickle Charge (LTC4054X)
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package

LTC4054-4.2 应用电路图

LTC4054-4.2 参数

LTC4054-4.2 订购信息和价格参考Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*
LTC4054ES5-4.2	SOT	5	E	$2.21
LTC4054ES5-4.2#PBF	SOT	5	E	$2.21
LTC4054ES5-4.2#TR	SOT	5	E	$2.21	$1.44
LTC4054ES5-4.2#TRM	SOT	5	E	$2.21	$1.46
LTC4054ES5-4.2#TRMPBF	SOT	5	E	$2.21	$1.46
LTC4054ES5-4.2#TRPBF	SOT	5	E	$2.21	$1.44
LTC4054LES5-4.2	SOT	5	E	$2.21
LTC4054LES5-4.2#PBF	SOT	5	E	$2.21
LTC4054LES5-4.2#TR	SOT	5	E	$2.21	$1.44
LTC4054LES5-4.2#TRM	SOT	5	E	$2.21	$1.46
LTC4054LES5-4.2#TRMPBF	SOT	5	E	$2.21	$1.46
LTC4054LES5-4.2#TRPBF	SOT	5	E	$2.21	$1.44
LTC4054XES5-4.2	SOT	5	E	$2.21
LTC4054XES5-4.2#PBF	SOT	5	E	$2.21
LTC4054XES5-4.2#TR	SOT	5	E	$2.21	$1.44
LTC4054XES5-4.2#TRM	SOT	5	E	$2.21	$1.46
LTC4054XES5-4.2#TRMPBF	SOT	5	E	$2.21	$1.46
LTC4054XES5-4.2#TRPBF	SOT	5	E	$2.21	$1.44

LTC4054-4.2 订购信息
以 PBF 结尾的器件型号表示这些是无铅型器件。如需了解有关含铅涂层器件的信息，请与BDTIC联系。
型号当中包含 TR 或 TRM 的器件分别采用卷带装或 500 片微型卷带装的形式进行装运。
如需了解更多的细节，请查阅我们一般订购信息或产品数据手册。

LTC4054-4.2 应用

蜂窝电话、PDA、MP3 播放机
充电座
蓝牙应用

LTC4054-4.2 仿真

如需对所选的凌力尔特产品进行仿真，请下载 LTSpice / SwitcherCAD III。这种功能强大的原理图捕获和仿真工具为凌力尔特 80% 的开关稳压器、200 多款运算放大器以及电阻器、晶体管和 MOSFET 提供了宏模型。