KIT34675EPEVBE评估套件采用了MC34675，是带4.85V/10mA的线性稳压器的高输入电压锂离子电池充电器。The charge cycle of the 34675 includes trickle , constant-current (CC), and constant-voltage (CV) charge modes. The CC-mode current is programmable up to 1A with an external resistor. The constant voltage is fixed at 4.2V with 0.7% accuracy over a -40°C to 85°C temperature range. The trickle-mode current is pre-set to 20% of the CC-mode current, when the battery voltage is lower than the trickle-mode threshold. The end-of-charge (EOC) current threshold is pre-set to 10% of the CC-mode current to save the board space and cost.A charge-current thermal-foldback feature limits the charge current when the IC internal temperature rises to the pre-set threshold of 120°C. The 34675 also protects the system with its input over-voltage protection (OVP) feature. Two indication pins (PPR and CHG) can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws less than 1.0?A leakage current from the battery.
Features
??? No external MOSFET, reverse-blocking diode or current-sense resistor is required
??? Guaranteed maximum 1A programmable CC-mode current
??? ±0.7% voltage accuracy and ±5% current accuracy over the -40°C to 85°C range
??? 4.85V/10mA linear regulator with 6.8V input over-voltage protection threshold
??? 28V maximum voltage for the power input with 6.8V over-voltage protection threshold
#板卡评测
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2012-10-10
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