LTC4054LTH7 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation

The LTC4054LTH7 is a compact, high-efficiency, standalone linear charger for single-cell lithium-ion batteries, designed and manufactured by Linear Technology. This device is specifically engineered to provide a simple and efficient solution for portable applications where space and thermal management are critical.

Key Features:

• Preset Charge Voltage: The LTC4054LTH7 accurately regulates the charge voltage to 4.2V, ensuring the battery is charged to its maximum capacity without overcharging, which can extend the battery's life.
• Adjustable Charge Current: The charge current can be set externally with a single resistor, providing design flexibility to accommodate batteries of various sizes and capacities.
• Thermal Regulation: To protect against overheating, the charger incorporates an internal thermal feedback loop that regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions.
• Automatic Recharge: Once the charge cycle is complete, the LTC4054LTH7 automatically initiates a new charge cycle when the battery voltage falls below a certain threshold, keeping the battery topped off.
• Charge Status Output: An onboard status output pin allows for a simple LED interface to indicate charge status, providing visual feedback for the user.
• Low Dropout Voltage: The low dropout voltage enables charging at lower input voltages, which is beneficial in applications where the input supply is limited.
• No External MOSFET, Sense Resistor, or Blocking Diode Required: The device integrates all the necessary components for charging, reducing the external part count and simplifying the overall design.

Applications:

The LTC4054LTH7 is ideal for a wide range of portable electronic devices, such as:

• Mobile Phones
• Digital Cameras
• MP3 Players
• Bluetooth Headsets
• Portable Medical and Fitness Equipment

With its small package size and integrated features, the LTC4054LTH7 provides a space-efficient charging solution that can be easily implemented into compact portable devices. The thermal regulation feature ensures safe and reliable charging even under varying environmental conditions, making it a versatile choice for modern, high-performance electronics.