Vin Range (V):
2 to 8
4.2 ± 1%
Adj. up to 0.8
Programmable Charge Current Up to 1A
No MOSFET, Sense Resistor or Blocking Diode Required
Charge Single Cell Li-ion Battery Directly from USB Port
Trickle Current, Constant Current and Constant Voltage Operation with Thermal Regulation to Maximize Charge Rate without Overheating
<1µA Battery Quiescent Current
Preset 4.2V Battery Charge Voltage with ±1% Accuracy
Charge Statue Indication Pin
The TMI4054 is a complete constant-current and constant-voltage linear charger for single cell Li-ion battery application.
The default battery charge voltage is fixed at 4.2V, and the charging current can be programmed by external resistor on PROG pin. The charging current could be programmed up to 800mA with good system thermal design. When the charging current drops to 1/10 programmed charging current value after the BAT voltage reaching battery charge voltage, TMI4054 automatically terminates the charge cycle with charging current becomes to 0 and pin status changes. Thermal regulation function can regulate charging current to limit the die temperature during high power condition or high ambient temperature application.
When the input supply is removed, the TMI4054 automatically enters low current state with less 1μA current dropping from battery side. Its SOT23-5 package and less external components make TMI4054 suited for portable applications.
Charging Docks and Cradles