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LTC4001EUF-1-TRPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC4001EUF-1-TRPBF Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page LTC4001-1 6 40011fa PIN FUNCTIONS NTC (Pin 11): Input to the NTC (Negative Temperature Coefficient) Thermistor Temperature Monitoring Circuit. Under normal operation, tie a thermistor from the NTC pin to the GNDSENS pin and a resistor of equal value from NTC to VIN. When the voltage on this pin is above 0.74VIN (Cold, 0°C) or below 0.29VIN (Hot, 50°C), charging is disabled and the CHRG pin blinks. When the voltage on NTC comes back between 0.74VIN and 0.29VIN, the timer continues where it left off and charging resumes. There is approximately 3°C of temperature hysteresis associated with each of the input comparators. If the NTC function is not used connect the NTC pin to GNDSENS. This will disable all of the NTC functions. NTC should never be pulled above VIN. PROG (Pin 12): Charge Current Program. The RPROG resistor connects from this pin to GNDSENS, setting the current: RPROG = 1.110k IBAT(AMPS) where IBAT is the high rate battery charging current. IDET (Pin 13): Charge Rate Detection Threshold. Connect- ing a resistor, RIDETto GNDSENS programs the charge rate detection threshold. If RIDET = RPROG, CHRG provides an IBAT/10 indication. For other thresholds see the Applica- tions Information section. SS (Pin 14): Soft-Start/Compensation. Provides soft-start function and compensation for the float voltage control loop and compensation for the charge current control loop. Tie a soft-start/compensation capacitor between this pin and GNDSENS. TIMER (Pin 15): Timer Capacitor. The timer period is set by placing a capacitor, CTIMER, to GNDSENS. Set CTIMER to: CTIMER = Time (Hrs) • 0.0733 (μF) where time is the desired charging time. Connect this pin to IDET to disable the timer. Connect this pin to GNDSENS to end battery charging when IBAT drops below the IDET charge rate threshold. BATSENS (Pin 16): Battery Sense Input. An internal resistor divider sets the final float voltage at this pin. The resistor divider is disconnected in sleep mode or when EN = H to reduce the battery drain current. Connect this pin to the positive battery terminal. Exposed Pad (Pin 17): Ground. This pin must be soldered to the PCB ground (PGND) for electrical contact and rated thermal performance. |
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