Datasheet for the LTC4054-4.2/LTC4054X-4.2, a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries with thermal…
The LTC4054-4.2/LTC4054X-4.2 is a complete constant-current/constant-voltage linear charger designed for single cell lithium-ion batteries. It features thermal regulation, programmable charge current up to 800mA, and requires no external MOSFET, sense resistor, or blocking diode. The device is ideally suited for portable applications such as cellular telephones, PDAs, and MP3 players, and is specifically designed to work within USB power specifications.
| Programmable Charge Current | Up to 800mA |
|---|---|
| Regulated Output Voltage | 4.2V |
| Supply Current (Shutdown Mode) | 25µA |
| Operating Ambient Temperature Range | -40 °C to 85°C |
| Maximum Junction Temperature | 125 °C |
| Package Type | 5-Lead SOT-23 |
No, the LTC4054 requires no MOSFET, sense resistor, or blocking diode.
The LTC4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
Yes, the LTC4054 can be put into shutdown mode, reducing the supply current to 25 µA.