TOP POWER ASIC TP5400

TP5400 is a Li-lon battery charger and 5V boost chip used for mobile power supply. High precision voltage and charge current regulator, pre-charge, charge indicator, charge circle termination and other functions are all integrated into a single chip. Maximum charge current can reach 1 A. Boost circuit uses CMOS DC/DC boost converter working in VFM switching mode, which has very low no-load current. Besides, It has limited no-load dissipation, up to 1000mA boost output current, and no external button is needed, which means it can work automatically when it is connected to supply. No blocking diode is required due to the internal PMOSFET architecture and have prevent to negative Charge Current Circuit. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The chip automatically terminates the charge cycle when the charge current drops to 1/5th the programmed value after the final float voltage is reached. Boost output capacity reaches 5V/1A due to the internal PMOSFET architecture and limited internal resistor. TP5400 only needs a limited external devices to work properly because of integration. TP5400 other features include over temperature protection, boost input current limit circuit, boost output current adjustment, rapid reaction and over-current shut down.

• Programmable Charge Current Up to 1.2A, Typically 1000mA
• Boost Current Up to 1.5A(Vbat = 3.8V), Typically 1000mA(Vbat = 3.3V)
• Specified for Mobile Power Supply with Single Li-lon Battery
• High Boost Efficient: 88%(Typ) Constant Current & Constant Voltage Operation, Heat Regulating Function makes High Charge Efficient without the Danger of Overheating
• 4.2V ± 1% charging voltage control Accuracy
• 5V ± 2.5% boost voltage control Accuracy
• Input Voltage Up to 9V
• two Charge Status Output Pins
• C/5 Charge Termination
• 2.9V Trickle Charge Threshold
• Soft-Start Limits Inrush Current
• Automatic Frequency Adjustment (VFM), adjust to Variety Loads (No-load Current less than 10uA when Supply Voltage is 5V), No External Button is Required for Start, and Terminates Boost Circuit when Battery Voltage is Low( less than 3V)
• Available Radiator in 8-Lead SOP/MSOP Package, the Radiator need connect GND or impending

• Mobile Power Supply