PJ4054B

PJ4054B is a complete single lithium ion battery with constant current/constant voltage linear charger. Its SOT package and small number of external components make the PJ4054B ideal for portable applications. PJ4054B can be suitable for USB power and adapter power supply work. Due to the internal PMOSFET architecture, plus the anti-inverted charging circuit, there is no need for external detection resistor and isolation diode. Thermal feedback adjusts the charging current to limit chip temperature at high power operation or ambient temperature conditions. The charging voltage is fixed at 4.2V, and the charging current can be set externally through a resistor. When the charging current reaches the final floating charging voltage and drops to the set value of 1/10, PJ4054B will automatically terminate the charging cycle. When the input voltage (ac adapter or USB power supply) is removed, PJ4054B automatically enters a low current state, reducing the battery leakage current below 1uA. PJ4054B can also be placed in stop mode to reduce the power supply current to 25uA. Other features of the PJ4054B include a charging current monitor, undervoltage latching, automatic recharging, and a status pin to indicate the end of charging and input voltage access.

Key features

• 500mA programmable charging current
• No MOSFET, test resistor or isolation diode required
• A complete linear charger with SOT-23-5 package for single lithium ion battery
• Constant current/voltage operation, with thermal regulation function
• Charge single lithium ion battery directly from USB port
• 4.2V charging voltage is preset
• Output of charging current monitor for battery quantity detection
• 1/10 Charge termination, automatic recharging
• Power supply current in standby mode is 25uA
• Soft boot limits the surge current
• 2.9V trickle charge device version