LX2208 EVALUATION BOARD USER GUIDE LX2208 THREE LEVEL BATTERY CHARGER (2A MAXIMUM) 8 8 ® TM Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX2208 EVALUATION BOARD USER GUIDE INTRODUCING TO PRODUCT The LX2208 Evaluation Board is available from Microsemi for evaluating the performance of the LX2208 Battery Charger Integrated Circuit. The component sizes used on the evaluation board facilitate easy probing, however, in practice, smaller component sizes are recommended to minimize the circuit physical size. KEY FEATURES Up to 2A Charging Current Integrated Power MOSFET Three Charge Levels for Adapter, and USB Hi and Low Charge Battery from a Current Limited Adapter 0.5% Battery Voltage Accuracy USB Current Compliance Battery Full Indicator CC/CV with Thermal Feedback Battery Temperature Monitor Precision Charge Termination o o o o o o Protection features: Unsafe Battery Temp Lockout Internal IC Temp Regulator USB Current Limiter Reverse Current Blocking Under Voltage Lockout False Termination Prevention under Low Supply Conditions APPLICATIONS Navigation Devices Multi-Media Players Handheld Devices Digital Cameras PART SPECIFIC INFORMATION Part Number Product LX2208ILD Three Level Lithium Ion Battery Charger TABLE 1 – PART INFORMATION IC LX2208ILD EVALUATION BOARDS LX2208 EVAL KIT TABLE 2 – EVALUATION BOARD INFORMATION Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX2208 EVALUATION BOARD USER GUIDE SCHEMATIC FOR LXE STATUS R6 2.49k 1 PWR C1 10uF GND C3 R12 2 0.47u 1.00k 8 6 R1 1.00k H 9 R11 1.00k 3 R3 2.49k 4 R7 CMP H/L 20% LX2208 DCOK TMP SD 10 500mA IN 5 L POWER SELECT STAT BAT 11 2.49k 12 HCP LCP CHARGING FULL POWER ATTACHED R8 121k R9 Not Used R10 24.9k GND 7 Battery Temperature Lockout Sensing NTC RT1 100mA RTN USB BAT TEMP R2 1.00k OFF BAT+ ON SHUTDOWN R5 3.57k R4 15.8k C2 10uF RTN Current Programming BATTERY Figure 1 – LX2208 Evaluation Board Schematic Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX2208 EVALUATION BOARD USER GUIDE IC BLOCK DIAGRAM Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX2208 EVALUATION BOARD USER GUIDE + SD 5 ENABLE DCOK 4 UVLO TMP 11 STAT 3 CHARGE CONTROL CMP 2 IN BAT 1 12 CHARGE TERMINATION CONTROL CONSTANT VOLTAGE CONTROL TEMPERATURE CONTROL CONDITIONING THRESHOLD H/L 8 COND. CURRENT 20% 6 LCP 9 HCP 10 LOW CHARGING CURRENT HIGH CHARGING CURRENT GND 7 Figure 2 – Simplified Block Diagram Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX2208 EVALUATION BOARD USER GUIDE LX2208 EVAL Connections. The LX2208 Evaluation Board has one power input and one power output connection. FUNCTION PIN NAME 2) Move the SHUTDOWN jumper to the ON position, the USB jumper to the 500mA position and the POWER SELECT jumper to the WALL position. 3) Apply a +5V power source to the PWR terminal and the power supply return to the GND terminal. VOLTAGE 4) The POWER ATTACHED and CHARGING LEDs should be lit when the battery is charging and the POWER ATTACHED and FULL LEDs should be lit when the battery is fully charged. Input Power PWR 5V +/- 0.65V Input RTN GND 0V Battery + BAT+ 0V to 4.3V 5) Monitor the charge current into the battery with a current probe. Battery - RTN 0V 6) Verify the charge current changes from approximately 2A to approximately 460mA when the POWER SELECT jumper is moved from the WALL to the USB position. Jumpers. The LX2208 Evaluation Board has three two position jumper blocks. The jumper can be moved to select either a high logic level or low logic level. It is also possible to remove the jumper and apply a voltage directly to the center pin of the jumper block. Hookup. The following is a demonstration scenario that can be used to evaluate the LX2208. 1) Apply the single cell Lithium Ion or Lithium polymer battery to the battery screw terminal block. Be sure to connect the positive terminal of the battery to the BAT+ terminal and the Negative terminal to the RTN terminal. Copyright © 2007 Rev. 1.0a, 2007-06-05 7) With the POWER SELECT jumper in the USB position, verify the charge current changes from approximately 460mA to approximately 92mA when the USB jumper is moved from the 500mA position to the 100mA position. 8) Verify that moving the SHUTDOWN battery to the OFF position extinguishes the LEDs and terminates the charge cycle. 9) The thermal lockout can be tested by momentarily applying a jumper between the RTC and RTN on the BAT TEMP jumper terminal. When the jumper is in place, the charging current will drop to zero, but the charge LED will remain illuminated. Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX2208 EVALUATION BOARD USER GUIDE LX2208 TYPICAL TEST HOOKUP Single Cell Lithium Ion Battery + + 5V Power Supply Figure 3 – LX2208 Typical Test Hookup PCB LAYOUT RECOMMENDATIONS It is recommended that C1and C2 be located within 1cm of the LX2208. The CMP capacitor and resistor (C3 and R12) should be located close to the IN and CMP pins. Also the high impedance summing node connecting to the TMP pin should be kept relatively short to prevent the coupling of noise into this node. It is important that the LX2208 have a good thermal path to ambient to dissipate heat. The simplest way to do this is to heatsink the LX2208 bottom pad Copyright © 2007 Rev. 1.0a, 2007-06-05 directly to the ground plane by placing 4 or more vias in the ground pad directly under the LX2208 footprint. Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX2208 EVALUATION BOARD USER GUIDE LX2208 PRINTED CIRCUIT BOARD LAYOUT Figure 3 – LX2208 Evaluation Board Layout Copyright © 2007 Rev. 1.0a, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX2208 EVALUATION BOARD USER GUIDE LX2208 EVALUATION BOARD BILL OF MATERIALS MISCELLANEOUS COMPONENTS Line Item Part Description 1 2 3 4 5 6 Microsemi IC – Tri Level Li-Ion Charger LED - Amber LED - Red LED - Green Thermistor – NTC, 100k Terminal Block 2 position/ 7mm spacing 7 Header 3 pin 0.100in spacing 8 9 10 11 Header 2 pin 0.100in spacing Header 1 pin Jumper, 2 Pos, 0.100 inch spacing Printed Circuit Board Manufacturer & Part # MICROSEMI Panasonic Panasonic Panasonic Vishay OST Microsemi LX2208ILD LNJ414K8YRA LNJ214K8ARA LNJ314G8TRA NTHS0402N01N1003J OST/2/7.0 Case 3x3 MLP 0603 0603 0603 0402 Reference Designators U1 CHARGING FULL POWER ATTACH RT1 BATTERY I PGM, SHUTDN, PWR SEL BAT TEMP PWR, GND I PGM, SHUTDN SGE#3547 X1 Qty 1 1 1 1 1 1 3 1 2 2 1 CAPACITORS Line Item 1 2 Part Description Capacitor, X5R, 10uF, 10V, 10% Capacitor, X7R, 0.47uF, 16V, 20% Part Number Case Reference Designators Qty Taiyo Yuden LMK316BJ106KD-T Taiyo Yuden EMK212BJ474KD-T 1206 0805 C1,2 C3 2 1 Case Reference Designators Qty 0805 0805 0805 0805 0805 0805 R1,2,11,12 R3,6,7 R4 R5 R8 R10 4 3 1 1 1 1 RESISTORS Line Item 1 2 3 4 5 6 Part Description Resistor, 1.00K, 1%, 1/10W Resistor, 2.49K, 1%, 1/10W Resistor, 15.8K, 1%, 1/10W Resistor, 3.57k, 1%, 1/10W Resistor, 121K, 1%, 1/10W Resistor, 24.9K, 1%, 1/10W Copyright © 2007 Rev. 1.0a, 2007-06-05 Part Number Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic ERJ-6ENF1001V ERJ-6ENF2491V ERJ-6ENF1582V ERJ-6ENF3571V ERJ-6ENF1213V ERJ-6ENF2492V Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9