**LTC1736IG#PBF: A High-Efficiency Linear Battery Charger Controller for Single and Dual-Cell Applications**
The **LTC1736IG#PBF** from Analog Devices represents a highly integrated and versatile solution for managing the charging process of lithium-ion (Li-Ion) and lithium-polymer (Li-Poly) batteries. As a sophisticated linear charger controller, it is specifically engineered to provide **precise and reliable termination** for both single-cell (4.1V or 4.2V) and dual-cell (8.2V or 8.4V) applications, making it an indispensable component in a wide array of portable electronics.
A standout feature of the LTC1736 is its **high-efficiency linear topology**, which is optimized for applications where switching noise is a critical concern. Unlike switching regulators, this linear controller minimizes noise and ripple, making it ideal for sensitive communication equipment, medical devices, and precision instruments. The IC achieves efficiency by regulating the voltage between the input supply and the battery, reducing the power dissipated across the internal pass transistor, especially when the input voltage is not significantly higher than the battery voltage.
The device offers exceptional flexibility through its programmable charge current. An external sense resistor allows designers to set the maximum charge current up to 1.5A, catering to batteries of various capacities. The charging cycle is governed by a constant-current/constant-voltage (CC/CV) algorithm with **accurate voltage regulation within ±0.6%**. This precision is crucial for maximizing battery capacity and ensuring long-term cycle life, as overcharging can severely degrade Li-Ion cells.
Furthermore, the LTC1736 incorporates several vital safety and user convenience features. It includes an internal **thermal feedback loop** that automatically reduces the charge current if the die temperature approaches 115°C, preventing overheating and potential damage. An integrated timer provides a backup termination safety net, stopping the charge cycle after a pre-programmed period (typically three hours). Status monitor outputs can be used to drive LEDs or communicate with a microcontroller, indicating states like charge-in-progress, charge complete, and the presence of an input supply (AC present).
The device is also designed for robustness. It can operate with an input voltage range of up to 15V and includes protections against reverse input voltage and reverse battery insertion. Housed in a compact 16-lead SSOP package, the LTC1736IG#PBF provides a compact yet powerful charging solution for space-constrained designs.
**ICGOOFind**：The LTC1736IG#PBF stands out as a robust, precise, and flexible linear battery charger controller. Its high accuracy, comprehensive safety features, and dual-cell capability make it a superior choice for designers seeking a reliable and low-noise power management solution for premium portable electronic products.
**Keywords**: Linear Battery Charger, Constant-Current/Constant-Voltage, Li-Ion Charging, Thermal Regulation, Programmable Charge Current.
