专营LINEAR一系列产品,价格优势,欢迎来电咨询0755-82811747 线性充电器开关充电器脉冲充电器SMBus/I2C/SPI 控制型电池充电器降压/升压电池充电器LTC1734L-4.2 - Lithium-Ion Linear Battery Charger in ThinSOT特点Low Profile (1mm) ThinSOT™ PackageProgrammable Charge Current: 50mA to 180mANo Blocking Diode RequiredNo Sense Resistor Required1% Accurate Preset Voltage: 4.2VCharge Current Monitor Output for Charge TerminationAutomatic Sleep Mode with Input Supply RemovalManual ShutdownNegligible Battery Drain Current in ShutdownUndervoltage LockoutSelf Protection for Overcurrent/Overtemperature 描述The LTC®1734L is a low cost, single cell, constant-current/constant-voltage Li-Ion battery charger controller. When combined with a few external components, the SOT-23 package forms a very small, low cost charger for single cell lithium-ion batteries. The LTC1734L is a lower charge current version of the LTC1734.The LTC1734L provides a fixed float voltage of 4.2V with 1% accuracy (for 4.1V and 4.15V float voltages, contact LTC Marketing). Constant current is programmed using a single external resistor between the PROG pin and ground. Manual shutdown is accomplished by floating the program resistor while removing input power automatically puts the LTC1734L into a sleep mode. Both the shutdown and sleep modes drain near zero current from the battery.Charge current can be monitored via the voltage on the PROG pin allowing a microcontroller or ADC to read the current and determine when to terminate the charge cycle. The output driver is both current limited and thermally protected to prevent the LTC1734L from operating outside of safe limits. No external blocking diode is required.The LTC1734L can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries using external