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MP26053 Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP26053 Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 11 page MP26053 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER MP26053 Rev. 0.9 www.MonolithicPower.com 7 8/25/2008 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. OPERATION Input Voltage Range The MP26053 has built-in input voltage surge protection as high as +28V. The charger IC will be automatically disabled when the input voltage is lower than 3.0V or higher than 7.0V. The open-drain pin ACOK is used to indicate an input power good condition (i.e. 3.0V<VIN<7.0V). If the input voltage is lower than the battery voltage, the IC is also disabled to prevent the battery from draining. Charge Cycle (Mode Change: Trickle -> CC-> CV) Figure 2 shows the typical charging profile for the MP26053. For a fully depleted battery with a terminal voltage lower than 2.6V, the MP26053 will start with the trickle charge (preconditioning) at 10% of the full charge current based on the value of RCHG. If the charger stays in trickle mode longer than 32768 cycles, CHG becomes high impedance, indicating a battery fault. After the battery voltage reaches 2.6V, the charger begins charging using the programmed charge current (ICHG).This is referred to as Constant Current (CC) mode. Once the battery voltage reaches 4.2V, the charger will operate in the constant voltage (CV) mode until the battery is fully charged. The charge current drops during CV mode, and the battery full indication is set when the charge current is reduced to 10% of the programmed constant current value (ICHG). The charge process is then terminated. Recharge will start after the battery voltage is reduced to 4.0V. After 262144 cycles of continuous charging, if the battery still has not reached 10% of the ICHG condition, the on-chip timer will terminate the charger to prevent charging the dead battery excessively and the fault condition will be flagged by flashing the CHG LED. Charge Termination The charge current will gradually decrease in CV mode as the battery approaches full. The battery full threshold is internally programmed to be 10% of the ICHG. When the charge current reaches this threshold, the charger IC will be automatically turned off. 2.6V 4.2V VBATT 10% of ICHG Trickle Charging CC Charging Charging Complete CV Charging ICHG IBATT Figure 2—MP26053 Typical Charging Profile Automatic Recharge When VBATT drops to 4.0V, the charger will automatically restart the charge cycle until the 10% ICHG condition is met again. When the input adapter is unplugged, or the charger is disabled and/or terminated, the leakage current from the battery to the MP26053 is less than 1uA. Programming of Charge Current and Battery Full Current The charge current (ICHG) is set by a resistor (RCHG) connected from the ISET pin to GND. The relationship between the charge current and the programming resistance is established by the following table and graph. Table 1—RCHG and ICHG Relationship RCHG (kΩ) ICHG (mA) 1.65 1000 1.82 900 2.05 800 2.32 700 2.74 600 3.3 500 4.12 400 5.6 300 8.45 200 15 100 |
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