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LTC4001EUF Datasheet(PDF) 6 Page - Linear Technology |
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LTC4001EUF Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page 6 LTC4001 4001f FAULT (Pin 10): Battery Fault. This pin is a logic high if a shorted battery is detected or if a temperature fault is detected. A temperature fault occurs with the temperature monitor circuit enabled and the thermistor temperature is either below 0 °C or above 50°C (typical). 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 approxi- mately 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: R k I PROG BAT AMPS = 1 110 . () where IBAT is the high rate battery charging current. PI FU CTIO S IDET (Pin 13): Charge Rate Detection Threshold. Connect- ing a resistor, RIDET to GNDSENS programs the charge rate detection threshold. If RIDET = RPROG, CHRG provides an IBAT/10 indication. For other thresholds see the Appli- cations 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 resis- tor 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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