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RT9525 Datasheet(PDF) 11 Page - Richtek Technology Corporation |
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RT9525 Datasheet(HTML) 11 Page - Richtek Technology Corporation |
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11 / 15 page  RT9525 11 DS9525-01 May 2011 www.richtek.com Charge State Indicator EN2 EN1 VIN Input Current Limit L L 90mA L H 475mA H L 1.5A H H Suspend Mode Charge Enable When EN is low, the charger turns on. When EN is high, the charger turn off. EN is pulled low for initial condition. VIN Input Current Limit Battery Pack Temperature Monitoring The RT9525 features an external battery pack temperature monitoring input. The TS input connects to the NTC thermistor in the battery pack to monitor battery temperature and prevent dangerous over temperature conditions. If at any time the voltage at TS falls outside of the operating range, charging will be suspended. The timers maintain their values but suspend counting. When charging is suspended due to a battery pack temperature fault, the CHG pin remains low and continues to indicate charging. When temperature reaches at “Too Cold” state, RNTC = RCOLD When temperature reaches at “Too Hot” state, RNTC = RHOT From (1), (2), the RT1 and RT2 can be calculated by the following equations : T1 COLD T2 NTC T1 COLD T2 NTC (R + R ) R I = 2.1V (V) (R + R ) + R where I = 75 A (typ.) μ × × T1 HOT T2 NTC T1 HOT T2 (R + R ) R I = 0.3V (V) (R + R ) + R × × (1) (2) ) 22 HOT COLD T1 COLD HOT COLD HOT T1 HOT T2 T1 HOT 1500 (R + R ) R 3000 20 5625 x (R R ) + 105 (R R 3000 (R + R ) R 250 R + 250 R 1 μ μ μμ μ μμ −× =+ −× − = ×× − Charge State CHG Output Charging Charging suspended by thermal loop Low (for first charge cycle) Safety timers expired 2Hz flash Charging done Recharging after termination IC disabled or no valid input power High impedance Figure 1 + - + - 2.1V 0.3V Too Cold Too Hot TS RT1 RT2 RNTC Suspend Mode Set EN1 = EN2 = H, and the charger will enter Suspend Mode. In Suspend Mode, CHG is in high impedance and ISUS(MAX) < 330 μA. Power Switch For the RT9525, there are three power scenarios : (1) When a battery and an external power supply (USB or adapter) are connected simultaneously : If the system load requirements exceed that of the input current limit, the battery will be used to supplement the current to the load. However, if the system load requirements are less than that of the input current limit, the excess power from the external power supply will be used to charge the battery. (2) When only the battery is connected to the system : The battery provides the power to the system. (3) When only an external power supply is connected to the system : The external power supply provides the power to the system. |
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