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Application NotesAN-171: Reverse Voltage Protection for Battery Chargers
Features and Benefits
- Programmable Charge Current Up to 950mA
- Complete Linear Charger in DFN Package
- No MOSFET, Sense Resistor or Blocking Diode Required
- Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
- Battery Kelvin Sensing Improves Charging Accuracy
- Charges Directly from a USB Port
- C/10 Charge Termination
- Preset 4.2V Charge Voltage with ±1% Accuracy
- Charge Current Monitor Output for Gas Gauging*
- Automatic Recharge
- Charge Status Output
- “AC Present” Output
- 2.9V Trickle Charge Threshold (LTC4058)
- Available Without Trickle Charge (LTC4058X)
- Soft-Start Limits Inrush Current
- Low Profile (3mm x 3mm x 0.75mm) DFN Package
The LTC4058 is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC4058 ideally suited for portable applications. Furthermore, the LTC4058 is designed to work within USB power specifications.
The LTC4058 can Kelvin sense the battery terminal for more accurate float voltage charging. No external sense resistor or external blocking diode are required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The charge voltage is fixed at 4.2V and the charge current is programmed with a resistor. The LTC4058 terminates the charge cycle when the charge current drops to 10% of the programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is removed, the LTC4058 enters a low current state dropping the battery drain current to less than 2µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and status pins to indicate charge termination and the presence of an input voltage.
*US Patent 6,522,118
- Cellular Telephones, PDAs, MP3 Players
- Bluetooth Applications
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
LTC4058-4.2 Companion Parts
Recommended Related Parts
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