LTC4054 - Linear Technology's Standalone Linear Li-Ion Battery Charger

The LTC4054 is a compact, high-efficiency, standalone linear battery charger manufactured by Linear Technology, designed specifically for single-cell lithium-ion batteries. This integrated circuit simplifies the process of charging by eliminating the need for an external power management controller. With its small footprint and simple external circuitry, the LTC4054 is an ideal solution for portable electronic devices where space and simplicity are critical.

Key Features:

• Precision Charge Voltage: The LTC4054 ensures the longevity and safety of the battery with its precise end-of-charge voltage accuracy of ±1% at 25°C.
• Programmable Charge Current: The charge current can be set with a single external resistor, providing flexibility to accommodate various battery capacities and thermal management requirements.
• Automatic Recharge: To maintain the battery at full capacity, the LTC4054 automatically initiates a recharge cycle when the battery voltage falls below an internal threshold.
• Charge Current Monitor: An output pin is available for monitoring the charge current, which can be used for charge termination or for indicating charge progress.
• Thermal Regulation: To maximize the charge rate without the risk of overheating, the LTC4054 includes thermal regulation that reduces charge current under high temperature conditions.
• No MOSFET, Sense Resistor, or Blocking Diode Required: This charger operates without the need for external power components, simplifying design and reducing system cost.
• Low Dropout Voltage: The device's low dropout voltage allows for charging at lower input voltages, which is beneficial in USB-powered applications.

Applications:

The LTC4054 is versatile and can be used in a wide range of applications, including:

• Cellular Telephones
• Personal Digital Assistants (PDAs)
• Digital Cameras
• MP3 Players
• USB-Powered Devices
• Portable Instruments

With its ease of use, reliability, and efficient charging capabilities, the LTC4054 from Linear Technology is an excellent choice for designers looking to integrate a hassle-free charging solution into their lithium-ion battery-powered devices.