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BL4054 Datasheet(PDF) 9 Page - SHANGHAI BELLING CO., LTD. |
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BL4054 Datasheet(HTML) 9 Page - SHANGHAI BELLING CO., LTD. |
9 / 16 page PPMIC BU www.belling.com.cn BL4054/BL4054B Rev 1.4 Belling Proprietary Information. Unauthorized Photocopy and Duplication Prohibited 5/2009 ©2009 Belling All Rights Reserved 9 BL4054/BL4054B 800mA Standalone Linear Li-Ion Battery Charger with Thermal Regulation in SOT23-5/TSOT23-5 Operation The BL4054/BL4054B is a single cell Lithium-Ion battery charger using a constant current / constant voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of 1%. The BL4054/BL4054B includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external components. Furthermore, the BL4054/BL4054B is capable of operating from a USB power source. Normal Charge Cycle A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold level and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the BL4054/BL4054B supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for full current charging. When the BAT pin voltage rises above 2.9V, the charger enters constant-current mode, where the programmed charge current is supplied to the battery. If the battery voltage is above 2.9V at power-on, BL4054B enters the constant-current mode immediately, while BL4054 will perform one more check. If the battery voltage is below the auto-recharge threshold, BL4054 enters the constant current mode, otherwise it goes to standby mode. This is the only difference between the BL4054 and BL4054B. Refer to Figure 1a and 1b for more details. When the BAT pin approaches the final float voltage (4.2V), the BL4054/BL4054B enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge current is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: CHG PROG I V 1000 R = PROG CHG R V 1000 I = The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation: 1000 R V I PROG PROG BAT • = Charge Termination A charge cycle is terminated when the charge current falls to 1/10 the programmed value after the final float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the PROG pin. When the PROG pin voltage falls below 100mV for longer than TTERM (typically 1ms), charging is terminated. The charge current is latched off and the BL4054/BL4054B enters standby mode, where the input supply current drops to 100 µA. (Note: C/10 termination is disabled in trickle charging mode). When charging, transient loads on the BAT |
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