STC4054GR

STC4054GR is a 800mA standalone linear li-Ion battery charger with thermal regulation in a 5 pin TSOT-23 package. It is a constant current/constant voltage charger for single cell Li-Ion batteries. The STC4054 is designed to work within USB power specifications. An internal block regulates the current when the junction temperature increases, in order to protect the device when it operates in high power or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current limitation can be programmed using a single resistor connected between PROG pin and GND. The charge cycle is automatically terminated when the current flowing to the battery is 1/10 of the programmed value. If the external adaptor is removed, the STC4054 turns off and a 2µA current can flow from the battery to the device. The device can be put into shutdown mode, reducing the supply current to 25µA. The device also has a charge current monitor, under voltage lockout, automatic recharge.

• No external MOSFET, sense resistors or blocking diode required
• Constant current / constant voltage operation with thermal regulation
• Charges single cell li-ion batteries directly from USB port
• Preset 4.2V charge voltage with 1% accuracy
• Automatic recharge
• Single charge status output pin
• Charge current monitor output for gas gauging
• C/10 charge termination, 25µA supply current in shutdown mode
• Low battery voltage detect for precharge setting
• Soft-start limits inrush current