The SGM4054B-YN5/TR is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its SOT23-5 package and low external component count make it ideally suited for portable applications. The SGM4054B-YN5/TR can be used in USB power and adapter power supplies.

Applications:

• Mobile Phones
• MP3/MP4 Players
• Bluetooth Applications
• Wearable Devices
• Portable Media Players

Features:

• Up to 800mA Programmable Charge Current
• No MOSFET, Sense Resistor or Blocking Diode Required
• Complete Linear Charger in SOT23-5 Package for Single Cell Lithium-Ion Batteries
• Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
• Charges Single Cell Lithium-Ion Batteries Directly from USB Port
• Preset 4.2V Charge Voltage with ±1% Accuracy
• Automatic Recharge
• Charge Status Output
• C/10 Termination
• 25μA Supply Current in Shutdown
• 2.9V Trickle Charge Threshold
• Available in SOT23-5 Package

Benefits:

• Simplified Design: Requires minimal external components, reducing board space and BOM cost.
• Thermal Protection: Prevents overheating and ensures safe charging.
• USB Compatibility: Allows direct charging from USB ports, enhancing convenience.
• High Accuracy: Ensures precise charging voltage, maximizing battery life and performance.
• Compact Size: Small package makes it ideal for space-constrained applications.

Additional Details:

The SGM4054B-YN5/TR utilizes a constant-current/constant-voltage charging algorithm. During constant-current mode, the charger delivers a regulated current to the battery. As the battery voltage approaches 4.2V, the charger switches to constant-voltage mode, maintaining the battery voltage at 4.2V until the charge current drops to C/10. The device also features thermal regulation to prevent overheating during high charge current operation.