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ACT5880 数据表(PDF) 80 Page - Active-Semi, Inc |
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ACT5880 数据表(HTML) 80 Page - Active-Semi, Inc |
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80 / 87 page  ACT5880 Rev 2, 03-Sep-13 - 80 - www.active-semi.com ActivePMU TM and ActivePathTM are trademarks of Active-Semi. I2CTM is a trademark of NXP. Copyright © 2013 Active-Semi, Inc. Active-Semi Confidential―Do Not Copy or Distribute rise far beyond a thermal threshold of nominal 100°C. The current reduction is about 50mA/°C for die temperature over the threshold. This feature prevents the ACT5880 from excessive junction temperature and makes it more accommodating of aggressive thermal designs without risk of damage. When the thermal regulation reduces the current, it takes longer time to charge the battery. The thermal regulation is counted in end of charge detection, which assures that the battery could be charged to the same status as a normal charged battery when the end of charge detected. Figure 17: The Charging Profile of the ACT5880 Charger. Charger State-Machine The I and V parameter changes, input condition and the time-out outputs of 2 timers trigger the state transitions. State Transition Table The LDO mode is a lonely state when the BATID detection is configured and the BATID reads invalid. The other states are subset available when the BATID reads valid or the BATID detection is not configured. Refer to Table 11 for transition details. Pre-condition State When the VVBAT is less than the precondition threshold voltage, the cell is charged at a reduced current of either 45mA or 10% of the fast charge current, whichever is the greater. Fast-Charge State When VVBAT is greater than the precondition threshold and before it reaches to the battery regulation voltage, or over 200mV falls down from the battery regulation voltage, the charger operates in fast-charge state, when the cell is charged with the fast charge current, or a less current restricted by the thermal regulation and power source capability. Once the VVBAT reaches the battery regulation voltage; the state machine jumps into Top-Off State. Table 11: The State Transition Summary. Note: The PTV stands for pre-condition threshold voltage, the BRV stands for battery regulation voltage, the ICHG stands for charge path current and the IEOC stands for end of charge current. Top-Off State In the Top-Off state, the cell is charged in constant voltage mode where the VVBAT is regulated at battery regulation voltage, which equals to the charge termination voltage specified in battery specification. The charge current goes less and less from the fast charge current as the charging is on and on, against the chemical and physical composition changes in the cell. Once the charge current goes less than the end of charge current threshold, the state machine jumps into Sleep State while the cell is recognized as full charged, the state is also the state of Sleep. Precondition Fast charge Top-off Suspend (or floating) Endof charge threshold (current) Precondition threshold (voltage ) VBAT regulation (voltage) Top-off start (voltage) Precondition regulation (current) Fast charge regulation (current) ICHARGE VVBAT Current=0 t Expended scale CURRENT STATE NEXT STATE CONDITIONS Any state Sleep VCHGIN<VVBAT, SUSCHG=1 or (total charge timer time-out) Any state Temp-Fault Battery Temp Out of Range Temp-Fault Sleep Battery Temp is OK Pre-condition Time-Fault Pre-condition timer times-out. Time-Fault Sleep Presumably battery replaced. Sleep Fast-Charge SUSCHG=0, VCHGIN valid and VVBAT< (BRV-200mV) Pre-condition Fast-Charge VVBAT>PTV, not Temp-Fault. Fast-Charge Top-Off VVBAT=BRV and not (Total Charge Time- Out ) Top-Off Sleep ICHG=IEOC and not (Charge Time- Out ) Sleep Pre-condition VVBAT<PTV |
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