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RT9526A Datasheet(PDF) 7 Page - Richtek Technology Corporation |
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RT9526A Datasheet(HTML) 7 Page - Richtek Technology Corporation |
7 / 10 page RT9526A 7 DS9526A-01 April 2011 www.richtek.com Application Information The RT9526A is a fully integrated low cost single cell Li- ion battery charger operable in Constant Current (CC) mode or Constant Voltage (CV) mode. The CC mode current is set with the external resistor, RISET, and the CV mode voltage is fixed at 4.2V. If the battery voltage is below a typical 2.55V pre-charge threshold, the RT9526A charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. The RT9526A is capable of being powered up from AC adapter and USB (Universal Serial Bus) port inputs. VIN Over Voltage Protection The input voltage is monitored by the internal comparator. The OVP threshold is set at 7V (typ.). When the input voltage exceeds the threshold, the controller outputs a logic signal to turn off the power P-MOSFET to prevent high input voltage from damaging the electronics in the handheld system. Nevertheless, an AC input voltage over 28V will still damage the RT9526A. When the input over voltage condition is removed, the controller will enable the output again by running through soft-start. Charger Enable Input ENB is an active-low logic input to enable the charger. Drive the ENB pin low or leave it floating to enable the charger. This pin has a 200k Ω internal pull down resistor. So when left floating, the input is equivalent to logic-low. Drive this pin high to disable the charger. Battery Charge Profile The RT9526A charges a Li-ion battery under Constant Current (CC) mode or Constant Voltage (CV) mode. The constant current of ISET is set via the external resistor, RISET, and the constant voltage is fixed at 4.2V. If the battery voltage is below a typical 2.55V pre-charge threshold, the RT9526A charges the battery with a trickle current until the battery voltage rises above the pre-charge threshold. When the battery voltage reaches 4.2V, the charger enters CV mode and regulates the battery voltage at 4.2V to fully charge the battery without the risk of over charge. CV CC Trickle 4.2V ICHG_FAST 2.8V 16.7 % ICHG_FAST CHG_SB CHG Indication IIMIN Charge Current 75 % ICHG_FAST Time Charge Voltage Figure 1. Typical Charge Profile a. Battery Pre-Charge Current During a charge cycle, if the battery voltage is below the pre-charge threshold, the RT9526A applies a pre-charge mode to the battery. This feature revives deeply discharged cells and protects battery life. The internally determined pre-charge rate of the RT9526A is 16.7% of the constant charge current. b. Battery Fast-Charge Current (CC Mode) The RT9526A offers ISET pin to determine the fast-charge current via an external resistor, RISET, connected between ISET and GND. The fast-charge current can be calculated by the following equation : ISET CHG_FAST ISET ISET V I = K x (mA) R KSET = 9959; VSET = 1.22 (typ.) Figure 2 Ω Battery Charge Current vs. RISET 0 200 400 600 800 1000 1200 1400 10 19 28 37 46 55 RISET (k ) |
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