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LX2206ILD-TR Datasheet(PDF) 8 Page - Microsemi Corporation |
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LX2206ILD-TR Datasheet(HTML) 8 Page - Microsemi Corporation |
8 / 14 page LX2206 PRODUCTION DATA SHEET Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 Copyright © 2007 Rev. 1.3a, 2007-08-28 Dual Level Lithium Ion Battery Charger TM ® APPLICATION NOTE LAYOUT In the layout of the Printed Circuit Board (PCB) it is important to provide a solid path from the IC power and ground pins to the power and ground planes of the PCB to provide a good conduction path for heat. This insures the LX2206 stays cool and can provide the maximum charge current to minimize the time required to charge the battery. For stability purposes and to reduce voltage switching transients it is important to place capacitors close to the IN and BAT pins. A 10µF capacitor (X5R or X7R dielectric) is recommended. CURRENT PROGRAMMING RESISTORS The LX2206 has two programming resistors to control the battery charging current during the constant current charging mode of the battery charging cycle. When the H/L pin is high (selecting the High Current charging mode), the charge current is determined by the value of the HCP programming resistor. The maximum charge current is determined by the programming current at either the HCP or LCP programming pins (depending on the state of H/L); the range of each of these channels is identical. The programming current is the HCP or LCP pin voltage (typically 1.25V) divided by the value of the programming resistor. For example, the HCP current with a 110K resistor to GND is: 11.4µA 110k 1.25 R 1.25 I HCP HCP = = = Charge Current vs IHCP (or ILCP) 0 200 400 600 800 1000 1200 0.00 50.00 100.00 150.00 IHCP (in uA) Using the table below it can be seen that for a programming current value of 11.4µA, the corresponding maximum charge current is 92mA. The termination current determines the point at which the charge cycle is terminated and the battery is determined to be fully charged. The termination current is determined by the value of the HCP programming current as determined by the HCP programming resistor. For a value of IHCP = 11.4µA (as was used in the previous example), the termination current from the chart below can be seen to be 9mA. Term ination Current vs IHCP 0 20 40 60 80 100 120 0.00 50.00 100.00 150.00 IHCP (in uA) The termination current is always roughly 10% of the maximum charge current set by the HCP resistor. |
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