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LTC4070IDDBTRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC4070IDDBTRPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC4070 6 4070f PIN FUNCTIONS NTCBIAS (Pin 1): NTC Bias Pin. Connect a resistor from NTCBIAS to NTC, and a thermistor from NTC to GND. Float NTCBIAS when not in use. Minimize parasitic capacitance on this pin. NTC (Pin 2): Input to the Negative Temperature Coefficient Thermistor Monitoring Circuit. The NTC pin connects to a negative temperature coefficient thermistor which is typically co-packaged with the battery to determine the temperature of the battery. If the battery temperature is too high, the float voltage is reduced. Connect a low drift bias resistor from NTCBIAS to NTC and a thermistor from NTC to GND. When not in use, connect NTC to VCC. Minimize parasitic capacitance on this pin. ADJ (Pin 3): Float Voltage Adjust Pin. Connect ADJ to GND to program 4.0V float voltage. Disconnect ADJ to program 4.1V float voltage. Connect ADJ to VCC to program 4.2V float voltage. The float voltage is also adjusted by the NTC thermistor. HBO (Pin 4): High Battery Monitor Output (Active High). HBO is a CMOS output that indicates that the battery is fully charged and current is being shunted away from BAT. This pin is driven high when VCC rises to within VHBTH of the effective float voltage. The absolute value of this threshold depends on ADJ and NTC, both of which affect the float voltage. HBO is driven low when VCC falls by more than (VHBTH + VHBHY) below the float voltage. Refer to Table 1 for the effective float voltage. GND (Pin 5, Exposed Pad Pin 9): Ground. The exposed package pad must be connected to PCB ground. LBO (Pin 6): Low Battery Monitor Output (Active High). LBO is a CMOS output that indicates when the battery is discharged below 3.2V or rises above 3.5V. This pin is driven high if VCC < VLBTH, and is driven low if VCC > (VLBTH + VLBHY). DRV (Pin 7): External Drive Output. Connect to the gate of an external PFET to increase shunt current for applications which require more than 50mA charge current. Minimize capacitance and leakage current on this pin. When not in use, float DRV. VCC (Pin 8): Input Supply Pin. The input supply voltage is regulated to 4.0V, 4.1V, or 4.2V depending on the ADJ pin state (see the ADJ pin description for more detail). This pin can sink up to 50mA in order to keep the voltage regula- tion within accuracy limits. When no battery is present, decouple to GND with a capacitor, CIN, of at least 0.1μF. |
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