LP4078QVF

The LP4078 device is a highly advanced linear charger for single cell Li-Ion and Li-Polymer battery. The device is ideally suited for portable applications since the DFN-10 package and low number of external components required. The LP4078 device employ a completed charge algorithm with trickle current/constant current/constant voltage mode and charge termination. The device supports charge current up to 1A which can be program by one external resistor. The device can withstand an input voltage up to 40V which can protect from the accidental insertion of high voltage adaptor. The device can withstand a BAT voltage up to 20V which is suited for power battery application. Without input supply, the battery reverse current is less than 0.1μA. The LP4078 device support JEITA temperature standard by an NTC monitoring battery temperature circuit. The device provides various safety features for battery charging, including input-over-voltage protection, battery reverse connection protection and device junction temperature-limit protection by limiting the charge current, which is implemented by an internal thermal feedback regulation loop. The LP4078 is available in a DFN-10 (3x3mm) package. The LP4078 device is a highly advanced linear charger with up to 1A maximum charge current for single cell Li-Ion and Li-Polymer battery. The device charges the battery in three modes: trickle current mode, constant current mode and constant voltage mode. When the battery voltage is lower than trickle charge threshold voltage 2.6V (typical), the device is in trickle current mode, the charge current will be set as approximately 10% of the ISET programmed current to bring the battery voltage up to a safe level for full current charging. When the battery voltage rises to be higher than trickle charge threshold voltage, the device enters the constant current mode, where the charge current is 100% of the ISET programmed current. When the battery voltage approaches the float voltage, the device goes to constant voltage mode, the charge current starts to decrease. When the charge current is lower than the IBF programed termination current threshold, the device will terminate the charging. The device will automatically recharge the battery while the battery voltage drops 150mV (typical, ΔVRECHRG) from the float voltage.

Applications

• Portable Media Players
• Cellular and Smart Mobile Phone
• Handheld Battery-Powered Devices
• Charging Docks and Cradles

Key features

• 1% Charge Voltage Accuracy
• 1A Maximum Charge Current
• <0.1μA Battery Reverse Current
• JEITA Temperature Standard Followed
• No External MOSFETs, Sense Resistor and Reverse-Blocking Diode Required
• Trickle Current/Constant Current/Constant Voltage Mode Supported
• Charge Termination and Automatic Recharge
• Maximum Input Voltage up to 40V with 22V Input-Over-Voltage Protection
• Maximum BAT Withstand Voltage up to 15V
• Thermal Feedback Regulation
• Battery Reverse Connection Protection
• ESD Protection
• RoHS Compliant and 100% Lead (Pb)-Free
• Package: 3x3mm DFN-10