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LTC4076 Datasheet(PDF) 11 Page - Linear Technology |
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LTC4076 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LTC4076 11 4076fa The power supply status output (PWR) has two states: pull-down and high impedance. The pull-down state indicates that power is present at either DCIN or USBIN. If no power is applied at either pin, the PWR pin is high impedance, indicating that the LTC4076 lacks sufficient powertochargethebattery.Thepull-downstateiscapable of sinking up to 10mA. Thermal Limiting Aninternalthermalfeedbackloopreducestheprogrammed chargecurrentifthedietemperatureattemptstoriseabove apresetvalueofapproximately105°C.Thisfeatureprotects the LTC4076 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the device. The charge current can be set according to typical (not worst-case) ambient temperature with the assurance that the charger will automatically reduce the current in worst- case conditions. DFN power considerations are discussed further in the Applications Information section. TRICKLE CHARGE MODE 1/10th FULL CURRENT CHRG STATE: PULLDOWN SHUTDOWN MODE IUSBIN DROPS TO 18µA CHRG STATE: Hi-Z CHARGE MODE FULL CURRENT CHRG STATE: PULLDOWN CHARGE MODE FULL CURRENT ⇒HPWR = HIGH 1/5 FULL CURRENT ⇒HPWR = LOW CHRG STATE: PULLDOWN STANDBY MODE NO CHARGE CURRENT CHRG STATE: Hi-Z SHUTDOWN MODE IDCIN DROPS TO 20µA CHRG STATE: Hi-Z BAT > 2.9V BAT < 2.9V BAT < 2.9V 2.9V < BAT 2.9V < BAT BAT > 2.9V BAT < 4.1V BAT < 4.1V IBAT < ITERMINATE IN VOLTAGE MODE IBAT < ITERMINATE IN VOLTAGE MODE POWER SELECTION STANDBY MODE NO CHARGE CURRENT CHRG STATE: Hi-Z TRICKLE CHARGE MODE 1/10th FULL CURRENT CHRG STATE: PULLDOWN EN DRIVEN HIGH EN DRIVEN LOW EN DRIVEN HIGH DCIN POWER REMOVED DCIN POWER REMOVED USBIN POWER REMOVED OR DCIN POWER APPLIED USBIN POWER REMOVED OR DCIN POWER APPLIED DCIN POWER APPLIED ONLY USB POWER APPLIED STARTUP 4076 F01 EN DRIVEN LOW Figure 1. LTC4076 State Diagram of a Charge Cycle OPERATIO |
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