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LTC4060 Datasheet(PDF) 8 Page - Linear Integrated Systems |
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LTC4060 Datasheet(HTML) 8 Page - Linear Integrated Systems |
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8 / 20 page  8 LTC4060 4060f OPERATIO The LTC4060 is a complete linear fast charging system for NiMH or NiCd batteries. Operation can be understood by referring to the Block Diagram, State Diagram (Figure 1) and application circuit (Figure 2). While in the unpowered sleep mode, the battery is disconnected from any internal loading. The sleep mode is exited and the shutdown mode is entered when VCC rises above the UVLO (Undervoltage Lock Out) exit threshold. The UVLO thresholds are depen- dent upon the number of series cells programmed by the SEL0 and SEL1 pins. When shutdown occurs the ACP pin goes from a high to low impedance state. The shutdown mode is exited and the charge qualification mode entered when all of the following conditions are met: 1) there is no manual shutdown command from SHDN, 2) the battery overvoltage detector does not detect a battery overvolt- age, 3) the battery removal detector detects a battery in place, 4) pause is inactive and 5) the IC’s junction tempera- ture is normal. Once in the charge qualification mode the thermistor interface monitors an optional thermistor net- work to determine if the battery temperature is within charging limits. If the temperature is found within limits charging can begin. While charging, the CHRG pin pulls to GND which can drive an LED. CHARGE QUALIFICATION BATTERY PRESENT AND TEMPERATURE GOOD (OPTIONAL) SHUTDOWN SLEEP SUPPLY GOOD (ACP = 0) LOW OR NO SUPPLY MANUAL SHUTDOWN (SHDN = 0) ADEQUATE SUPPLY AND CHARGER ENABLED BATTERY REMOVED, BATTERY OVERVOLTAGE, CHARGE PERIOD TIMED OUT OR IC TOO HOT PRECHARGE (IMAX/5) FAST CHARGE (IMAX) AUTOMATIC RECHARGE –∆V TERMINATION 4060 F01 ADEQUATE VCELL AND TEMPERATURE GOOD (OPTIONAL) VCELL < AUTORECHARGE THRESHOLD Figure 1. LTC4060 Basic State Diagram |
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