Data of Charging Chip Parameters for High Voltage Lithium Batteries (1A) SLM6400 parameter data: ------------------------------------------------------- Maximum Rating Value  Input power supply voltage (Vcc): -0.3V~28V  PROG:-0.3V~8.0V  BAT:-0.3V~12.0V  NCHRG:-0.3V~28.0V  NSTDBY:-0.3V~28.0V  NTC:-0.3V~8.0V  NCE:-0.3V~8.0V  Maximum junction temperature: 145 C  Temperature range of working environment: - 40 ~85.  Storage Temperature Range: - 65 ~125.  Pin temperature (welding time 10 seconds): 260 C ----------------------------- characteristics  Maximum 28V input withstand voltage  Charging current up to 1000 mA  Battery Back Connection Protection  No need for MOSFET, test resistance or isolation diode  For single lithium-ion batteries  Constant Regulation Current/Constant Function to Voltage Operation with Thermal Maximize Charging Rate without Overheating Risk  4.2V Preset Charging Voltage with Accuracy of <1%  Charging Current Monitor Output for Battery Volume Detection  Automatic recharge  Dual Output Charging State, Battery-free and Fault State Display  C/10 Charging Termination  2.5V Trickle Current Charging Threshold  Soft start limits surge current  Battery temperature monitoring function  Miniaturized DFN3*3-8L package --------------------------------------------------------------cycle --------------------------------------- Typical application Pin function Complete charging Pin 1 Na me NTC 2 PROG 3 4 5 6 7 8 GND VCC BAT NSTDBY NCHRG NCE Explain Battery Temperature Detection Input Constant Current Charging Current Setting and Charging Current Monitoring Terminal Power ground Input voltage positive input Battery Connector Full charge instruction Charging status indication Chip Enabling Input NTC (pin 1):Battery temperature detection input.Connect the pin to the output end of the battery NTC sensor.If the voltage of NTC pin is less than 150 mV or more than 1.2V, it means that the battery temperature is too high or too low and the charging is suspended.If NTC is suspended or connected to the ground with resistance over 1M, the battery temperature detection function is cancelled and other charging functions are normal. PROG (pin 2):Constant current charging current setting and charging current monitoring terminal.The charging current can be programmed by connecting an external resistor from the PROG pin to the ground end.In the pre-charging stage, the voltage of the pin is limited to 0.2V; in the constant-current charging stage, the voltage of the pin is fixed to 1V.In all charging modes, the charging current can be estimated by measuring the voltage of the pin according to the following formula: IBAT= VPROG/RPROG*1200 GND (pin 3):Power ground. VCC (pin 4):Input voltage positive input.The pin voltage is the working power supply of the internal circuit.When the voltage difference between VCC and BAT pins is less than 30 mV, SLM6400 will enter a low-power shutdown mode, and the current of BAT pins will be less than 2 uA. BAT (pin 5):Battery connection end.Connect the front end of the battery to this pin.When the chip is banned from working or sleeping mode, BAT Leakage current of pin is less than 2uA.The BAT pin provides the battery with charging current and 4.2V limiting voltage. NSTDBY (pin 6):Battery Full Indicator of Leakage Open Output.When the battery is full, the pin is pulled to a low level by the internal switch, otherwise the pin is in a high resistance state. NCHRG (pin 7):The charging state indicator of drain open circuit output.When the charger charges the battery, the pin is pulled to a low level by the internal switch, indicating that charging is in progress; otherwise, the pin is in a high resistance state. NCE (pin 8):Chip enabled input.Input of low level will make the chip in normal working state; input of high level will make the chip in prohibited charging state.NCE pins can be driven at TTL or CMOS levels. --------------------------------------------------------- DC characteristics Sym bol VCC pa ra m et er c o n di ti o n mini mu m valu e Input power supply voltage 4.0 Input power supply Standby mode current (charging termination) ICC Downtime (RPROG connected, mode not Vcc<VBAT or VCC<VUV) Max Typi imu cal m valu value e Com pan y 5 6.0 V 102 200 UA 60 100 UA Output VFLO Stable (Floating) Voltage AT current: RPROG = 2.4K, current (current mode test mode condition is VBAT = RPROG = 1.2K, current mode 4.0V) BAT I