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LTC4120 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4120 Datasheet(HTML) 10 Page - Linear Technology |
10 / 32 page LTC4120/LTC4120-4.2 10 4120fe For more information www.linear.com/LTC4120 pin FuncTions CHRG (Pin 14): Open-Drain Charge Status Output Pin. Typically pulled up through a resistor to a reference voltage, the CHRG pin indicates the status of the battery charger. The pin can be pulled up to voltages as high as IN when disabled, and can sink currents up to 5mA when enabled. When the battery is being charged, the CHRG pin is pulled low. When the termination timer expires or the charge current drops below 10% of the programmed value, the CHRG pin is forced to a high impedance state. FAULT (Pin 15): Open-Drain Fault Status Output Pin. Typi- cally pulled up through a resistor to a reference voltage, this status pin indicates fault conditions during a charge cycle. The pin can be pulled up to voltages as high as IN when disabled, and can sink currents up to 5mA when enabled. An NTC temperature fault causes this pin to be pulled low. A bad battery fault also causes this pin to be pulled low. If no fault conditions exist, the FAULT pin remains high impedance. RUN (Pin 16): Run Pin. When RUN is pulled below VEN and its hysteresis, the device is disabled. In disabled mode, battery charge current is zero and the CHRG and FAULT pins assume high impedance states. If the voltage at RUN is pulled below VSD, the device is in shutdown mode. When the voltage at the RUN pin rises above VEN, the INTVCC LDO turns on. When the INTVCC LDO rises above its UVLO threshold the charger is enabled. The RUN pin should be tied to a resistive divider from VIN to program the input voltage at which charging is enabled. Do not float the RUN pin. INTVCC ITH INTVCC INTVCC HOT COLD DISABLE IN 2 INTVCC INTVCC INTVCC RSNS 0.3 RFB1 10k RNOM 10k T RFB2 RPROG 4 PWM LTC4120 ENABLE ENABLE RUN CIN 10µF • C2S C2P LR 2.45V BOOST CINTVCC 2.2µF CBST 22nF LSW 33µH 1 INTVCC SW 8 CHGSNS 10 FB 11 FBG 13 PROG 4120 F01 9 BAT GND CBAT 22µF Li-Ion LDO 5 + – INTVCC 588k V-EA C-EA UVCL DZ VFB(REG) 1.2V ENABLE + – + – + + – 0.9V BAT SHUTDOWN DUVLO VIN(DHC) IN + – IN – 80mV + – BAT 2.21V 16 DHC 6 FAULT ENABLE LOWBAT 15 CHRG 14 NTC LOWBAT 12 FREQ IN IN 7 IN 3 CNTRL NTC DHC Figure 1. Block Diagram block DiagraM |
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