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LTC4098EPDC-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC4098EPDC-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 32 page LTC4098/LTC4098-1 9 40981fb OVSENS (Pin 1): Overvoltage Protection Sense Input. OVSENS should be connected through a 6.04k resistor to the input power connector and the drain of an external N-channel MOS pass transistor. When the voltage on this pin exceeds a preset level, the OVGATE pin will be pulled to GND to disable the pass transistor and protect down- stream circuitry. If overvoltage protection is not desired, connect OVSENS to GND. OVGATE (Pin 2): Overvoltage Protection Gate Output. Connect OVGATE to the gate pin of an external N-channel MOS pass transistor. The source of the transistor should be connected to VBUS and the drain should be connected to the product’s DC input connector. This pin is con- nected to an internal charge pump capable of creating sufficient overdrive to fully enhance the pass transistor. If an overvoltage condition is detected, OVGATE is brought rapidly to GND to prevent damage to downstream circuitry. OVGATE works in conjunction with OVSENS to provide this protection. If overvoltage protection is not desired, leave OVGATE open. CLPROG (Pin 3): USB Current Limit Program and Monitor Pin. A 1% resistor from CLPROG to ground determines the upper limit of the current drawn from the VBUS pin. A precise fraction of the input current, hCLPROG, is sent to the CLPROG pin when the high side switch is on. The switching regulator delivers power until the CLPROG pin reaches 1.188V. Therefore, the current drawn from VBUS will be limited to an amount given by hCLPROG and RCLPROG. There are several ratios for hCLPROG available, two of which correspond to the 500mA and 100mA USB specifications. A multilayer ceramic averaging capacitor is also required at CLPROG for filtering. NTCBIAS (Pin 4): NTC Thermistor Bias Output. If NTC operation is desired, connect a bias resistor between NTCBIAS and NTC, and an NTC thermistor between NTC and GND. To disable NTC operation, connect NTC to GND and leave NTCBIAS open. NTC (Pin 5): Input to the NTC Thermistor Monitoring Circuits. The NTC pin connects to a negative temperature coefficient thermistor which is typically co-packaged with the battery pack to determine if the battery is too hot or too cold to charge. If the battery’s temperature is out of range, charging is paused until the battery temperature re-enters the valid range. A low drift bias resistor is required from NTCBIAS to NTC and a thermistor is required from NTC to ground. If the NTC function is not desired, the NTC pin should be grounded. BATSENS (Pin 6): Battery Voltage Sense Input. For proper operation, this pin must always be connected to BAT. For best performance, connect BATSENS to BAT physically close to the Li-Ion cell. PROG (Pin 7): Charge Current Program and Charge Cur- rent Monitor Pin. Connecting a 1% resistor from PROG to ground programs the charge current. If sufficient input power is available in constant-current mode, this pin servos to 1V. The voltage on this pin always represents the actual charge current by using the following formula: I V R BAT PROG PROG = • 1030 CHRG (Pin 8): Open-Drain Charge Status Output. The CHRG pin indicates the status of the battery charger. Four possible states are represented by CHRG: charging, not charging, unresponsive battery and battery temperature out of range. CHRG is modulated at 35kHz and switches between a low and a high duty cycle for easy recognition by either humans or microprocessors. CHRG requires a pull-up resistor and/or LED to provide indication. GND (Pin 9, 21): Exposed Pad and pin must be soldered to the PCB to provide a low electrical and thermal imped- ance connection to ground. IDGATE (Pin 10): Ideal Diode Amplifier Output. This pin controls the gate of an external P-channel MOSFET transis- tor used to supplement the internal ideal diode. The source of the P-channel MOSFET should be connected to VOUT and the drain should be connected to BAT. BAT (Pin 11): Single-Cell Li-Ion Battery Pin. Depending on available power and load, a Li-Ion battery on BAT will either deliver system power to VOUT through the ideal diode or be charged from the battery charger. The LTC4098 will charge to a maximum voltage of 4.200V. The LTC4098-1 will charge to a maximum voltage of 4.100V. PIN FUNCTIONS |
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