The LM3520SD is a single-cell lithium-ion (Li-Ion) battery charger with a system power path management feature, manufactured by National Semiconductor (now Texas Instruments). It is designed to efficiently charge a single Li-Ion battery while simultaneously powering a system load. This device is ideal for portable applications where battery life and efficient power management are critical.

Applications:

• Portable Media Players
• Smartphones
• Digital Cameras
• Handheld Devices
• Low-Power Battery Charging Applications

Features:

• Single-Cell Li-Ion Battery Charger
• System Power Path Management
• High Efficiency Synchronous PWM Charger
• Thermal Regulation
• Reverse Blocking Protection

Benefits:

• Optimized Battery Charging: Efficiently charges a single-cell Li-Ion battery using a synchronous PWM architecture, maximizing battery life.
• Simultaneous System Power: Allows the system to operate even with a depleted battery by managing power from the input source.
• Thermal Protection: Thermal regulation reduces charging current during high-temperature conditions, protecting the battery and charger.
• Protection Features: Reverse blocking protection prevents damage from incorrect power connections.
• Reduced System Size: Integrated solution minimizes external components, reducing board space and overall system cost.

Technical Specifications:

The LM3520SD typically features an input voltage range of 4.2V to 5.5V. It supports charging currents up to 1A. The charge voltage is typically 4.2V. The switching frequency is around 1.5 MHz. It includes thermal regulation to prevent overheating. The device is usually available in a small outline package (SOP) or similar. The quiescent current is kept low to minimize power consumption when not actively charging. This charger is optimized for portable devices requiring efficient and safe Li-Ion battery charging with system power path management capabilities.