LOWPOWER(微源半导体)China

The LP4033 is a fully integrated switch mode charger solution with power path management targeting singlecell Li-ion battery powered portable applications. A low on-resistance BUS-FET is integrated to manage the input power from the VIN pin. A bidirectional buck or boost converter is integrated to manage charging and discharging of the battery. The buck charger supports up to 3-A charging current with up to 95% efficiency. The ultra-low quiescent current boost converter consumes less than 2-μA and supports up to 1.5-A output current. Two independent load switches provide power from the PMID pin to the LDSW1 pin and LDSW2 pin with high accuracy current limit. An NTC circuit is offered to manage the temperature range that charging or discharging is allowed. A LDO pin delivers power to the system that contains an MCU typically. The LP4033 offers power path management that allows the system to be powered up with a fully-discharged battery. It can dynamically manage the power from the VIN input and the battery to meet the system loading needs. An I2C interface enables programming various parameters ofcharging, discharging, and multiple protection functions. An interrupt output (IRQb) sends a signal to the MCU when an interrupt event happens so the MCU can take actions accordingly. Multiple features are offered for the safe operation of the system, including input voltage OVP (over voltage protection), UVLO (under voltage lockout), OTP (over temperature protection), SCP (short circuit protection), etc.When powered by a battery, LP4033 can operate with only 5-µA current. The whole System is in a 24-pin 4 X 4 QFN package.