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| 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. Features Automatically Identifies the polarity of the battery Typical-Current to 250mA Short-Circuit Protection Low external component Build in high precision reference voltage Preset 4.2V Charge Voltage with 1% Accuracy. 20uA Supply Current in Shutdown. Support Standalone Battery Charger. Support both 2-LED and Flashing LED schemes. Available in 6-Lead SOT-23-6L DIP-8 and COB Packages. RoHS Compliant and 100% Lead (Pb)-Free Pin Configuration Application Universal Travel Charger Pin Configuration 1 LED2 2 VIN 3 BAT- 4 GND 5 BAT+ 6 LED3 7 LED1 COB Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 1 Application Diagram Figure 1 7 color LED circuit LED1 Figure 2 2 LED circuit + SE9020C 4.75V ~6V 220uF/16V + BAT- SE9020D BAT+ LED2 LED1 BATBAT+ LED2 1 2 3 6 5 4.75V ~6V 220uF/16V 1 2 3 6 5 4 4 _ SOT-23-6 _ SOT-23-6 SE9020C SOT-23-6L SE9020D SOT-23-6L Figure 3 7 color LED circuit Figure 4 2 LED circuit + BAT- + SE9020 BAT- 4.75V~6V 220uF/16V 1 2 3 4 DIP8 8 7 6 5 SE9020 LED1 4.75V ~6V 220uF/16V LED2 _ BAT+ _ 1 2 3 4 DIP8 8 7 6 5 LED1 LED3 BAT+ SE9020 DIP-8 SE9020 DIP-8 Figure 5 7 color LED circuit Figure 6 2 LED circuit + 4.75V ~6V 220uF/16V + 1 2 3 4 5 6 7 LED1 BAT- 4.75V~6V LED2 1 2 3 4 5 6 7 LED3 LED1 BATBAT+ 220uF/16V _ BAT+ _ SE9020 COB SE9020 COB Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 2 Absolute Maximum Rating (1) Parameter Input Supply Voltage BAT Voltage BAT Voltage LED1 LED2 BAT Short-Circuit Duration Thermal Resistance, Junction-to-Ambient BAT Pin Current LED1/2 Current Maximum Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) JA IBAT ILED TJ TS Symbol Vin VBAT+ VBATVLED1 VLED2 Value 8 7 7 7 7 Continuous 250 (SOT-23-6) 250 20 125 -65 to +125 300 C/W mA mA C C C Units V V V V V Operating Rating (2) Parameter Supply Input Voltage Junction Temperature Symbol VIN TJ Value +4.75 to +6 -40 to +85 Units V C Electrical Characteristics VIN = 5V; TJ = 25C; unless otherwise specified. Symbol Vin VTerm VFloat IBAT VShort FOSC Notes: #1. When the battary disconnected to the charger, SE9020 disables the internal charging transistor. This will cause the Vbat to float to Vin. Parameter Input Supply Voltage Regulated Output (Terminal) Voltage Floating Voltage BAT Pin Current Short Circuit Protection Voltage Flashing Frequency Conditions Vin=6V, IBAT = 14mA. Vin=6V, IBAT = 0. Note#1. Vin=6V|Vbtp-Vbtn|<3.5V Vin=6V|Vbtp-Vbtn| :3V to 0V Vin=6V|Vbtp-Vbtn|=3.5V Min 4.75 4.158 Typ Max 6 Unit V V V mA V Hz 4.2 Vin 250 2.5 5 4.242 Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 3 Pin Functions Pin Pin Function Description P Positive Input Supply Voltage. Provides Pin Pin Function Description Vin power to the charger. Vin can range from 4.75V to 6V and should be bypassed with at least a 1F capacitor. 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. LED1 is lit on when the Vin is connected to any voltage between 4.75V GND Ground. LED1 and 6V. Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V. SE9020C/D will automatically identify the polarity so this pin can be connected to BAT- also. With SOT-23-6L package. LED2 supports 2 options to indicate the Charging and Full of the battery. With SE9020D, the LED2 will flash at 5Hz frequency during charging. When the battery is full, LED2 will BAT+ LED2 output a constant voltage and the flashing will stop. With SE9020C, LED2 can drive a standard 7-color IC-LED. 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 output a constant voltage and the flashing will stop NC With DIP-8 package NC is the unused PIN Typical Operating Characteristics Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 4 Typical Operating Characteristics 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: Vbat (V) + SE9020C 4.75V~6V 220uF/16V LED1 BAT- 1 2 3 6 5 4 LED2 BAT+ _ 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 Description Battery Detection Battery Unload Battery Charge Battery Full Battery Shorted Shorted Connected Connected Power Supply Condition Disconnected Connected Battery Condition Connected Disconnected Disconnected LED1 Bright Bright Bright Bright Bright Dark LED2 (7-color) Dark Dark Dark Flash Dark Dark Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 5 Application Notes: + SE9020D 4.75V~6V 220uF/16V LED1 BATBAT+ LED2 1 2 3 6 5 4 _ 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 Description Battery Detection Battery Unload Battery Charge Battery Full Battery Shorted Power Supply Condition Disconnected Connected Battery Condition Connected Disconnected Disconnected LED1 Bright Bright Bright Bright LED2 Dark Dark Dark Flash Bright Dark Connected Connected Shorted Bright Dark Revision 2/16/2009 Preliminary and all contents are subject to change without prior notice (c) 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 (c) 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 (c) Seaward Electronics Inc., 2007. * www.seawardinc.com.cn * Page 8 |
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