L6924U中文资料具有集成电源开关的USB兼容电池充电器系统数据手册ST规格书

描述 Description

The L6924U is a fully monolithic battery charger that safely charges single-cell Li-Ion/Polymer battery from either a USB power source or an AC adapter. In USB mode, the L6924U supports both low-power and high-power mode. Alternatively the device can charge from an AC wall adapter. The ideal solution for space-limited portable products integrates the power MOSFET, reverse blocking diode, sense resistor and thermal protection into a compact VFQFPN16 package. When an external voltage regulated adapter or USB port is used, the L6924U works in linear mode, and charges the battery in a constant current constant voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the device can operate in quasi-pulse mode, dramatically reducing the power dissipation. Regardless of the charging approach, a closed-loop thermal control avoids device overheating. The device has an operating input voltage ranging from 2.5 V to 12 V and it allows the user to program many parameters, such as fast-charge current, end-of-charge current threshold, and charge timer. The L6924U offers two open collector outputs for diagnostic purposes, which can be used to either drive two external LEDs or communicate with a host microcontroller. Finally, the L6924U also provides other features like gas gauge function, checks for battery presence, and monitors and protects the battery from unsafe thermal conditions.

特性 Features

• Fully integrated solution, with power MOSFET, reverse blocking diode, sense resistor, and thermal protection
• Charges single-cell Li-Ion batteries from selectable AC adapter or USB input
• Programmable charge current up to 1 A in AC adapter mode
• Programmable charging current in USB mode for both high-power and low-power inputs
• 4.2 V output voltage with ± 1 % accuracy
• Linear or quasi-pulse operating mode
• Closed-loop thermal control
• Programmable end-of-charge current
• Programmable charge timer
• (NTC) or (PTC) thermistor interface for battery temperature monitoring and protection
• Status outputs to drive LEDs or to interface with a host processor
• Small VFQFPN 16-lead package (3 x 3 mm)

简介

L6924U属于集成电路（IC）的电池充电器。由制造生产的L6924U电池充电器电池充电器 PMIC（电源管理集成电路）是元器件级产品系列，用于在电子设备中实现电池充电控制和充电管理功能。这些器件主要根据电池化学及其设计用于的电池数量来分类，可提供电化学电池和超级电容器安全充电所必需的电流或电压调节和监视功能。