Features Description SE9020C/D is a complete Limit-current & constant voltage charger for single cell Lithium-ion and Lithium-Polymer batteries. Its SOT-23-6L package and low external component count make SE9020C/D ideally suited for portable applications. Furthermore, the SE9020C/D is specifically designed to work within Universal Travel Charger. SE9020C/D has a built-in detector that will automatically detect the polarity of the inserted battery and charge the battery at the correct the polarity. The charge voltage is fixed at 4.2V. The SE9020C/D automatically terminates the charge cycle when the charge current drops to 14mA after the final float voltage is reached. When the input supply is removed, the SE9020C/D automatically enters a low current stage, dropping the battery drain current to less than 7mA. The SE9020C/D can be put into shutdown mode, reducing the supply current to 30uA. SE9020C/D supports two LED drivers that give the customers the option to select which method fit best in their respective applications. One LED driver is internally set to indicate the power on/off of the IC. Another LED driver can either drive a standard LED named SE9020D or 7-color LED named SE9020C, which will be explained in detail in the application notes. ¾ Automatically Identifies the polarity of the battery ¾ Typical-Current to 250mA ¾ Short-Circuit Protection ¾ Low external component ¾ Build in high precision reference voltage ¾ Preset 4.2V Charge Voltage with ±1% Accuracy. ¾ 20uA Supply Current in Shutdown. ¾ Support Standalone Battery Charger. ¾ Support both 2-LED and Flashing LED schemes. ¾ Available in 6-Lead SOT-23-6L DIP-8 and COB Packages. ¾ RoHS Compliant and 100% Lead (Pb)-Free Pin Configuration Application Universal Travel Charger ¾ Pin Configuration 1 LED2 2 VIN 3 4 5 6 7 BAT- GND BAT+ LED3 LED1 COB Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 1 Application Diagram Figure 1 7 color LED circuit + Figure 2 2 LED circuit + LED1 BAT- SE9020C 1 4.75V~6V 6 2 BAT+ 1 4.75V~6V 5 3 4 LED2 SOT-23-6 _ 220uF/16V 220uF/16V _ SE9020D SE9020C SOT-23-6L Figure 3 BAT- LED1 6 2 5 3 4 BAT+ LED2 SOT-23-6 SE9020D SOT-23-6L 7 color LED circuit Figure 4 + 2 LED circuit + BAT- BAT- SE9020 220uF/16V _ 8 7 6 5 LED1 1 2 3 4 4.75V~6V LED2 _ DIP8 BAT+ 220uF/16V 1 2 3 4 4.75V~6V SE9020 8 7 6 5 LED1 LED3 DIP8 BAT+ SE9020 DIP-8 Figure 5 SE9020 DIP-8 7 color LED circuit Figure 6 + + 1 2 3 4 5 6 7 4.75V~6V LED1 BAT- 4.75V~6V LED2 BAT+ SE9020 COB _ 220uF/16V 220uF/16V _ 2 LED circuit 1 2 3 4 5 6 7 SE9020 LED3 LED1 BATBAT+ COB Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 2 Absolute Maximum Rating (1) Parameter Symbol Value Units Input Supply Voltage Vin 8 V BAT Voltage VBAT+ 7 V BAT Voltage VBAT- 7 V LED1 VLED1 7 V LED2 VLED2 7 V BAT Short-Circuit Duration Continuous Thermal Resistance, Junction-to-Ambient ΘJA 250 (SOT-23-6) °C/W BAT Pin Current IBAT 250 mA LED1/2 Current ILED 20 mA Maximum Junction Temperature TJ 125 °C Storage Temperature TS -65 to +125 °C 300 °C Lead Temperature (Soldering, 10 sec) Operating Rating (2) Parameter Symbol Value Units Supply Input Voltage VIN +4.75 to +6 V Junction Temperature TJ -40 to +85 °C Electrical Characteristics VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol Parameter Vin Input Supply Voltage VTerm Regulated Output (Terminal) Conditions Min Typ 4.75 Vin=6V, IBAT = 14mA. Voltage 4.158 4.2 Max Unit 6 V 4.242 V VFloat Floating Voltage Vin=6V, IBAT = 0. Note#1. Vin V IBAT BAT Pin Current Vin=6V，|Vbtp-Vbtn|<3.5V 250 mA VShort Short Circuit Protection Voltage Vin=6V，|Vbtp-Vbtn| :3V to 0V 2.5 V FOSC Flashing Frequency Vin=6V，|Vbtp-Vbtn|=3.5V 5 Hz Notes: #1. When the battary disconnected to the charger, SE9020 disables the internal charging transistor. This will cause the Vbat to float to Vin. Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 3 Pin Functions Pin Pin Function Description Pin P Positive Input Supply Voltage. Provides Vin power to the charger. Vin can range from 4.75V to 6V and should be Pin Function Description Charge Current Output. Provides charge current to the battery and BAT- regulates the final float voltage to 4.2V. SE9020C/D will automatically identify the polarity so this pin can be connected to BAT+ also. bypassed with at least a 1μF capacitor. LED1 is lit on when the Vin is connected to any voltage between 4.75V Ground. GND LED1 With SOT-23-6L package. LED2 supports 2 options to indicate the Charge Current Output. Provides Charging and Full of the battery. With SE9020D, the LED2 will flash at charge current to the battery and BAT+ regulates the final float voltage to 4.2V. SE9020C/D will automatically identify and 6V. 5Hz frequency during charging. When the battery is full, LED2 will LED2 output a constant voltage and the flashing will stop. With SE9020C, LED2 can drive a standard 7-color IC-LED. the polarity so this pin can be connected to BAT- also. With DIP-8 package LED2 can only drive a standard 7-color IC-LED. With DIP-8 package the LED3 will flash at 5Hz frequency during charging. LED3 When the battery is full, LED3 will NC With DIP-8 package NC is the unused PIN output a constant voltage and the flashing will stop Typical Operating Characteristics Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 4 Typical Operating Characteristics Vbat (V) Vbat Versus Ibat 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 250 200 150 100 50 0 Ibat (mA) Application Notes: + LED1 BAT- SE9020C 4.75V~6V 220uF/16V _ 1 6 2 5 3 4 BAT+ LED2 SOT-23-6 Figure #5. Flashing 7-Color LED Application. SE9020C also supports 7-color LED applications. The connections are shown in this schematic and the Logic of LED’s is shown in the table below. Detection Power Supply Battery Description Condition Condition Disconnected Connected Battery Detection Battery Unload Battery Charge LED1 LED2 (7-color) Connected Bright Dark Disconnected Bright Dark Disconnected Bright Dark Bright Flash Bright Dark Dark Dark Connected Connected Battery Full Battery Shorted Shorted Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 5 Application Notes: + SE9020D 1 4.75V~6V 220uF/16V _ BAT- LED1 6 2 5 3 4 BAT+ LED2 SOT-23-6 Figure #6. Flashing 2-LED Application. The LED’s are connected between Pin1 and Pin6 to Power Supply. The logic of LED’s operations is shown in the table below. Detection Power Supply Battery Description Condition Condition Disconnected Connected Battery Detection Battery Unload Battery Charge LED1 LED2 Connected Bright Dark Disconnected Bright Dark Disconnected Bright Dark Bright Flash Bright Bright Dark Dark Connected Connected Battery Full Battery Shorted Shorted Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 6 OUTLINE DRAWING SOT-23-6L OUTLINE DRAWING DIP-8 Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 7 Customer Support Seaward Electronics Incorporated – China Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation – Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated – North America 1512 Centre Pointe Dr. Milpitas, CA95035, USA Tel: 1-408-821-6600 Last Updated - 2/16/2009 Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2007. • www.seawardinc.com.cn • Page 8