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LT3652EDDTRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LT3652EDDTRPBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 26 page  LT3652 7 3652fb PIN FUNCTIONS VIN (Pin 1): Charger Input Supply. VIN operating range is 4.95V to 32V. VIN must be 3.3V greater than the pro- grammed output battery float voltage (VBAT(FLT)) for reli- able start-up. (VIN – VBAT(FLT)) ≥ 0.75V is the minimum operating voltage, provided (VBOOST – VSW) ≥ 2V. IVIN ~ 85μA after charge termination. VIN_REG (Pin 2): Input Voltage Regulation Reference. Maximum charge current is reduced when this pin is below 2.7V. Connecting a resistor divider from VIN to this pin enables programming of minimum operational VINvoltage. This is typically used to program the peak power voltage for a solar panel. The LT3652 servos the maximum charge current required to maintain the programmed operational VIN voltage, through maintaining the voltage on VIN_REG at or above 2.7V. If the voltage regulation feature is not used, connect the pin to VIN. SHDN (Pin 3): Precision Threshold Shutdown Pin. The enable threshold is 1.2V (rising), with 120mV of input hysteresis. When in shutdown mode, all charging functions are disabled. The precision threshold allows use of the SHDN pin to incorporate UVLO functions. If the SHDN pin is pulled below 0.4V, the IC enters a low current shutdown mode where VIN current is reduced to 15μA. Typical SHDN pin input bias current is 10nA. If the shutdown function is not desired, connect the pin to VIN. CHRG (Pin 4): Open-Collector Charger Status Output; typically pulled up through a resistor to a reference volt- age. This status pin can be pulled up to voltages as high as VIN when disabled, and can sink currents up to 10mA when enabled. During a battery charging cycle, if required charge current is greater than 1/10 of the programmed maximum current (C/10), CHRG is pulled low. A tem- perature fault also causes this pin to be pulled low. After C/10 charge termination or, if the internal timer is used for termination and charge current is less than C/10, the CHRG pin remains high-impedance. FAULT (Pin 5): Open-Collector Charger Status Output; typically pulled up through a resistor to a reference volt- age. This status pin can be pulled up to voltages as high as VIN when disabled, and can sink currents up to 10mA when enabled. This pin indicates fault conditions during a battery charging cycle. A temperature fault causes this pin to be pulled low. If the internal timer is used for termina- tion, a bad battery fault also causes this pin to be pulled low. If no fault conditions exist, the FAULT pin remains high-impedance. TIMER (Pin 6): End-Of-Cycle Timer Programming Pin. If a timer-based charge termination is desired, connect a capacitor from this pin to ground. Full charge end-of- cycle time (in hours) is programmed with this capacitor following the equation: tEOC = CTIMER • 4.4 • 106 A bad battery fault is generated if the battery does not achieve the precondition threshold voltage within one- eighth of tEOC, or: tPRE = CTIMER • 5.5 • 105 A 0.68μF capacitor is typically used, which generates a timer EOC at three hours, and a precondition limit time of 22.5 minutes. If a timer-based termination is not desired, the timer function is disabled by connecting the TIMER pin to ground. With the timer function disabled, charging terminates when the charge current drops below a C/10 threshold, or ICHG(MAX)/10 VFB(Pin7):BatteryFloatVoltageFeedbackReference. The charge function operates to achieve a final float voltage of 3.3V on this pin. Output battery float voltage (VBAT(FLT)) is programmed using a resistor divider. VBAT(FLT) can be programmed up to 14.4V. The auto-restart feature initiates a new charging cycle when the voltage at the VFB pin falls 2.5% below the float voltage reference. The VFB pin input bias current is 110nA. Using a resistor divider with an equivalent input resistance at the VFB pin of 250k compensates for input bias current error. Required resistor values to program desired VBAT(FLT) follow the equations: R1 = (VBAT(FLT) • 2.5 • 105)/3.3 (Ω) R2 = (R1 • 2.5 • 105)/(R1 - (2.5 • 105)) (Ω) R1 is connected from BAT to VFB, and R2 is connected from VFB to ground. |
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