LG KU250 Service Manual - Page 46
U250/KU250 Battery Bar DisplayStand By Condition
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3. TECHNICAL BRIEF 3.9.3. Charging control A programmable charging block in PM6650 is used for battery charging. It is possible to set limits for the charging current. The external supply typically connects directly to pin (VCHG). The voltage on this pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is applied or not. For additional accuracy or to capture variations over time, this voltage is routed internally to the housekeeping ADC via the analog multiplexer. PM6650 circuits monitor voltages at VCHARGER and ICHARGE pins to determine which supply should be used and when to switch between the two supplies. These pins are connected to the Source (or emitter) and Drain (or collector) contacts of the pass transistor respectively. 4.2V~3.82V 100~70 (%) 3.81V~3.74V 69~45 (%) 3.73V~3.69V 44~20 (%) 3.68V~3.59V 19~3 (%) 3.58V~3.20V 2~0 (%) Figure 1.13 U250/KU250 Battery Bar Display(Stand By Condition) - 47 -