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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ACT2804 데이터시트(PDF) 12 Page - Active-Semi, Inc |
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ACT2804 데이터시트(HTML) 12 Page - Active-Semi, Inc |
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12 / 23 page  Rev 3, Apr-17-2017 Innovative Power TM - 12 - www.active-semi.com Copyright © 2017 Active-Semi, Inc. ACT2804 ACT2804 is a complete battery charging and discharging power management solution for applications of dull-cell lithium-based backup battery pack or power bank. With the advanced bidirectional architecture, a synchronous boost/buck converter is connected from VOUT to switching node (SW). The converter could be configured as either boost to charge battery or buck to discharge battery. Modes of Operation ACT2804 has 3 operation modes: charge mode, discharge mode, and high-impedance (HZ) mode. High Impedance (HZ) Mode HZ mode is the default mode. In HZ mode, all the switches are turned off , only PB circuit alive and the IC draws less than 10uA current from VBAT. Discharge Mode In discharge mode, Buck converter operates in CV/ CC regulation. VOUT1 current limit is set at 1.25A and VOUT2 current limit is set at 2.65A. Charge Mode ACT2804 is configured in charge mode (boost mode) when VIN is valid. In this mode, a battery is charged with trickle, preconditioning, fast charge, top-off and end of charge (EOC). The typical charge management is shown in Figure 1. Precondition Charge When operating in precondition state, the cell is charged at a reduced current at 15% of the programmed maximum fast charge constant current. Once VBAT reaches the precondition threshold voltage the state machine jumps to the fast charge state. Fast Charge If battery voltage is above preconditioning threshold, boost converter charges battery with constant current. In fast charge state, the ACT2804 charges at the current set by the external resistor connected at the ICST pin. During a normal charge cycle fast charge continues in CC mode until VBAT reaches the charge termination voltage, at which point the ACT2804 charges in top off state. Top Off Device transitions from Fast Charge (CC) to Top Off (CV), and moves to EOC (End of Charge) state when charging current is less than IEOC. End of Charge In Top Off mode, when charges current decreases to 10% of set fast charge current, the boost converter goes into end of charge mode and keep monitoring the battery voltage. Recharge In EOC, device would re-charge batteries when both battery voltage levels drops 5% below VEOC. Battery Removal If the battery is removed, boost converter regulates at the programmed regulation voltage. Cell Balance Cell Balance is activated in both Fast Charge and Top Off modes. Each battery is connected with a parallel bleeding switch. Push Button PB is always watched in HZ mode and discharge mode. If the push but on PB is pressed for >40mS in HZ mode, the LED (s) will turn on for 5 seconds. In the mean time, discharge mode is enabled. FUNCTIONAL DESCRIPTION A: PRECONDITION STATE B: FAST-CHARGE STATE C: TOP-OFF STATE D: END-OF-CHARGE STATE Figure 1. Typical Li+ Charge Profile and ACT2804 Charge States |
유사한 부품 번호 - ACT2804_17 |
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유사한 설명 - ACT2804_17 |
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