LX2205 EVALUATION BOARD USER GUIDE LX2205 BATTERY CHARGER & POWER INTERFACE ® TM Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX2205 EVALUATION BOARD USER GUIDE INTRODUCING TO PRODUCT The LX2205 Evaluation Board is available from Microsemi for evaluating the performance of the LX2205 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 Charging up to 1A. Charging from USB port. USB current compliance Auto battery switchover CC/CV w thermal Feedback Battery temp monitor Precision Charge Termination APPLICATIONS Navigation Devices Portable USB Devices Multi-Media Player PDA Phones Digital Cameras PART SPECIFIC INFORMATION Part Number LX2205ILQ Product Battery Charger and Power Interface TABLE 1 – PART INFORMATION IC LX2205ILQ EVALUATION BOARDS LX2205 EVAL KIT TABLE 2 – EVALUATION BOARD INFORMATION Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX2205 EVALUATION BOARD USER GUIDE SCHEMATIC FOR EVB J2 SYS LOAD GND USB GND MDC GND 1 2 3 4 5 6 SHDN OFF 1 2 ON 3 SUSP SUSP 1 2 USB ON 3 UCL USB HI 1 2 USB LO 3 VCC 1 2 3 D3 SS22 5 4 R10 10k R11 10k R12 10k 6 7 8 10 MDC USB SHDN SUSP UCL LX2205 U1 CMP CHG DONE TFB C2 10uF 1 SYS 3 2 BAT VCC J1 C3 0.1uF CHG DONE R4 14 2.49k 15 R5 2.49k 16 DCOK 13 GND CTP CUS CCP 11 9 12 R1 R2 R3 49.9k 20k 2.26k R7 NU 1 TEMP 2 GND 3 BAT 4 GND C1 10uF R6 121k R8 24.9k RT1 100k R9 10k DC OK GND VCC Figure 1 – LX2205 Evaluation Board Schematic Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX2205 EVALUATION BOARD USER GUIDE IC BLOCK DIAGRAM MDC Wall Adapter DC OK Supervisor SYS Input Current Limit USB USB Power Ideal Diode System Load Compensation CMP Ground GND BAT Li-Ion Battery Charger CHG CTP DONE Charge Status Indicators Taper Current Setting SHDN Shutdown SUSP Suspend USB Control CCP UCL Charge Current Setting High/Low SYS TFB Battery Temp Battery Temperature Monitor CUS USB Current Setting Figure 2 – Simplified Block Diagram Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX2205 EVALUATION BOARD USER GUIDE LX2205 EVB TEST PROCEDURE Connections. The LX2205 Evaluation Board has two power input and two power output connections. GND is the return for all inputs and outputs. FUNCTION PIN NAME VOLTAGE Adapter Power MDC 5V +/- 0.65V USB Power USB 5V +/- 0.65V Battery + BAT+ 0V to 4.3V System Load SYS LOAD 2.8Ω < R < ∞ The following is a test procedure for the LX2205 evaluation board: 1) Place the jumpers in the following positions: VCC SHDN SUSP UCL Place in the BATTERY position. Place in the ON position. Place in the USB ON position. Place in the USB HI position. 2) Apply the Battery Simulator (referred to below as the battery) between the BAT terminal and GND terminal. Adjust the battery voltage to 3.9V. 3) Battery Simulator + + Variable Power Supply 2 Ohm 15 Watt - Copyright © 2007 Rev. 1.0, 2007-06-05 To LX2205 - 4) Verify the DCOK pin is >3.7V. 5) Apply a 5.0V power source between the MDC terminal and GND terminal. 6) Verify the CHG LED is illuminated. 7) Verify the voltage at the DCOK test point is <100mV. 8) Verify the current flowing into the battery is 1000 +/- 150mA. 9) Place the VCC jumper in the SYS position and verify the CHG LED is illuminated. Then place the VCC jumper in the BATTERY position. 10) Place the SHDN jumper in the OFF position and verify the current flowing into the battery drops to 0mA +/- 1mA. Then place the SHDN jumper in the ON position. 11) Slowly adjust the battery voltage to 4.25V while monitoring the current flowing into the battery and verify the Battery Charge current drops to 0mA +/1mA, the CHG LED shuts off and the DONE LED turns on. Just before the CHG LED turns off, verify the current flowing into the battery is less than 100mA but greater than 40mA. 12) Set the battery voltage to 3.9V. 13) Remove the 5.0V power source from the MDC terminal and apply it to the USB terminal. 14) Verify the current flowing into the battery is between 425mA and 500mA. 15) Place the UCL jumper in the USB LO position and verify the current flowing into the battery is between 85mA and 100mA. 16) Place the SUSP jumper in the SUSPEND position and verify the current flowing into the battery drops to 0mA +/- 1mA. Then place the SUSPEND jumper in the USB ON position. 17) Place a 20Ω load from the SYS terminal and GND terminal and verify the CHG Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX2205 EVALUATION BOARD USER GUIDE LED and DONE LED are off. Verify the current flowing into the USB pin is 90mA +/- 10mA. Then remove the 20Ω load. 18) Monitor the battery current and apply heat (from a heat gun) to RT1. Verify that when RT1 gets hot, that the battery current drops to 0mA +/- 1mA. Verify when the heat is removed, after a short wait to cool, that the battery current flowing into the battery is between 85mA and 100mA. 19) Place the jumpers in their initial positions. 20) Test COMPLETE. R9 R8 R7 R6 GND SYS_LOAD R2 R1 C2 USB U1 C3 D3 GND + R4 R5 J1 GND GND R3 GND BATTERY UCL USB HI SUSP USB ON ON OFF SHDN USB LO R11 - R12 CONTROL LOGIC R10 + Adapter Power SUSPEND SYS VCC - RT1 MDC USB Power DCOK BATTERY C1 System Load TEMP J2 Single Cell Lithium Ion or Polymer GND CHG DONE LX2205 TYPICAL TEST HOOKUP INTEGRATED PRODUCTS LX2205 USB Li-Ion Battery Charger Figure 3 – LX2205 Typical Test Hookup Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX2205 EVALUATION BOARD USER GUIDE PCB LAYOUT RECOMMENDATIONS It is recommended that C1and C2 be located within 1cm of the LX2205. The CMP capacitor should be located close to the SYS 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 LX2205 have a good thermal path to ambient to dissipate heat. The simplest way to do this is to heatsink the LX2205 bottom pad directly to the ground plane by placing 4 or more vias in the ground pad directly under the LX2205 footprint. SGE#3541 X1 SGE#3541 X1 SGE#3541 X1 BOTTOM LAYER WR TOP LAYER RR Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX2205 EVALUATION BOARD USER GUIDE R9 R8 R7 R6 GND DCOK R4 R5 J1 TEMP GND CHG DONE LX2205 PRINTED CIRCUIT BOARD LAYOUT BATTERY R2 R1 C2 C3 D3 GND USB U1 C1 SYS_LOAD J2 GND GND R3 RT1 MDC BATTERY USB LO UCL USB HI SUSP USB ON ON OFF SHDN R12 R11 R10 CONTROL LOGIC SUSPEND SYS VCC GND INTEGRATED PRODUCTS LX2205 USB Li-Ion Battery Charger Figure 3 – LX2205 Evaluation Board Layout Copyright © 2007 Rev. 1.0, 2007-06-05 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX2205 EVALUATION BOARD USER GUIDE LX2205 EVALUATION BOARD BILL OF MATERIALS MISCELLANEOUS COMPONENTS Line Item Part Description 1 2 3 4 5 6 7 Microsemi IC – Battery Charger LED - Red LED - Green Thermistor – NTC, 100k Diode, Schottky, 2A, 20V Test Point Header 6 pin 0.100in spacing 8 Header 3 pin 0.100in spacing 9 10 Header 4 pin 0.100in spacing Printed Circuit Board Manufacturer & Part # MICROSEMI Panasonic Panasonic Vishay On Semi Keystone Microsemi LX2205ILQ LNJ214K8ARA LNJ314G8TRA NTHS0402N01N1003J SS22 5007 Case 4x4 MLP 0603 0603 0402 SMB Reference Designators U1 DONE CHG RT1 D3 DCOK, GND J2 VCC, SHDN, SUSP, UCL J1 Qty 1 1 1 1 1 2 1 4 1 1 SGE#3541 X1 CAPACITORS Line Item 1 2 Part Description Capacitor, X5R, 10uF, 10V, 10% Capacitor, X7R, 0.1uF, 16V, 20% Part Number Case Reference Designators Qty Taiyo Yuden LMK212BJ106KD-T Taiyo Yuden EMK107BJ104KA-T 0805 0603 C1,2 C3 2 1 Case Reference Designators Qty 0603 0603 0603 0603 0603 0603 0603 R1 R2 R3 R4-5 R6 R8 R9-12 1 1 1 2 1 1 4 RESISTORS Line Item 1 2 3 4 5 6 7 Part Description Resistor, 49.9k, 1%, 1/10W Resistor, 20.0k, 1%, 1/10W Resistor, 2.26k, 1%, 1/10W Resistor, 2.49k, 1%, 1/10W Resistor, 121k, 1%, 1/10W Resistor, 24.9k, 1%, 1/10W Resistor, 10k, 1%, 1/10W Copyright © 2007 Rev. 1.0, 2007-06-05 Part Number Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic ERJ-3EKF4992V ERJ-3EKF2002V ERJ-3EKF2261V ERJ-3EKF2491V ERJ-3EKF1213V ERJ-3EKF2492V ERJ-3EKF1002V Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9