General Description
The RT9519B is an integrated single cell Li-ion battery charger with Auto Power Path Management (APPM). No external MOSFETs are required. The RT9519B enters sleep mode when power is removed. Charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. For the RT9519B, the charge current can also be programmed with an external resistor and modified with an external GPIO. The scope that the battery regulation voltage can be modified with an external GPIO depends on the battery temperature.

Features
• 28V Maximum Rating for VIN Power
• Selectable Power Current Limit (0.1A / 0.5A / 1.5A)
• Integrated Power MOSFETs
• Auto Power Path Management (APPM)
• Battery Charging Current Control
• Battery Regulation Voltage Control
• Programmable Charging Current and Safe Charge Timer
• Under Voltage Protection, Over Voltage Protection
• Power Good and Charge Status Indicator
• Optimized Charge Rate via Thermal Feedback
• Thin 20-Lead WQFN Package
• RoHS Compliant and Halogen Free

Applications
• Digital Cameras
• PDAs and Smart Phones
• Portable Instruments