19-1918; Rev 0; 1/01 MAX1773 Evaluation Kit Features ♦ +4.75V to +28V AC-Adapter Input Range ♦ Up to 5A Steering Capability ♦ P-Channel MOSFET Steering Switches ♦ Adjustable Battery Minimum Voltage Level ♦ SMBus Multiplexer ♦ AC-Present and Battery-Status LEDs ♦ Interfaces to MAX1772EVKIT Battery Charger ♦ Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information PART TEMP. RANGE MAX1773EVKIT 0°C to +70°C IC PACKAGE 20 TSSOP Component List DESIGNATION QTY DESCRIPTION C1, C6 2 0.1µF, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 2 33µF, 35V low-ESR tantalum capacitors AVX TPSD336035R0300 or Kemet T495X226K035AS4394 recommended C2, C3 C4, C5 C7 C8, C9, C10, C12 C11 0 1 Not installed, 33µF, 35V lowESR capacitors AVX TPSD336035R0300 or Kemet T495X226K035AS4394 recommended 4.7µF, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475KG 4 0.1µF, 16V X7R ceramic capacitors (0603) Taiyo Yuden EMK107BJ104MA 1 0.33µF, 16V X7R, ceramic capacitor (0805) Taiyo Yuden EMK212BJ334KG DESIGNATION QTY DESCRIPTION C13, C14 2 1.5µF, 25V low-ESR tantalum capacitors AVX TPSA155K025R0300 or Kemet T494A105(1)025AS D1 1 250mA, 75V switching diode (SOT23) Central Semiconductor CMPD914 D2, D3 2 Green surface-mount LEDs (SS) Panasonic P521CT P1−P7 7 8A, -30V P-channel MOSFETs (SuperSOT8) Fairchild FDR858P R1, R3 2 100kΩ ±1% resistors (0805) R2 1 10kΩ ±1% resistor (0805) R4 1 3.3kΩ ±5% resistor (0805) R5 1 28.7kΩ ±1% resistor (0805) R6 1 100kΩ potentiometer (9mm) Mouser 323-409H-100K R7 1 40.2kΩ ±1% resistor (0805) SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX1773 General Description The MAX1773 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that routes charge and discharge currents between two battery packs, a buck step-down battery charger, and an ACadapter power source. The circuit uses a MAX1773 IC in a 20-pin TSSOP package and is configured for an AC-adapter input range of +4.75VDC to +28VDC. The EV kit uses seven P-channel MOSFETs to steer current between the power sources and the load. The battery minimum voltage level sets the threshold for battery undervoltage conditions and can be adjusted from +4.65V to +13V. The EV kit features an SMBus™ signal multiplexer that routes SMBus signals for the smart battery packs. LEDs are provided to indicate the status of the AC adapter and battery packs. The MAX1773 EV kit also demonstrates low-current usage with several options to reduce current usage. Evaluates: MAX1773 MAX1773 Evaluation Kit Component List (continued) DESIGNATION QTY R8, R9 2 430Ω ±5% resistors (0805) DESCRIPTION Quick Start The MAX1773 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. R10, R11 2 510kΩ ±5% resistors (0805) R12, R13, R14 3 8.2kΩ ±5% resistors (0805) Power-Up Sequence R15−R18 4 10kΩ ±5% resistors (0805) TB1, TB2 2 5-point terminal blocks (0.2in center) Mouser 506-2MV05 SW1, SW2 2 3-position, SPDT, slide switches Mouser 612-EG1218 Note: See the connection diagram (Figure 1). 1) Rotate potentiometer R6 completely clockwise. 2) Verify that shunts JU2 (AC_PRESENT), JU3 (BATT_STAT), JU4 (R16, CLK) and JU5 (R17, DAT) are across pins 1 and 2. 3) Verify that switches SW1 and SW2 are in position 1 (B battery). 4) Connect a +28VDC power supply to the ADAPTER_IN pad. Connect the supply ground to the GND pad next to the ADAPTER_IN pad. 5) Connect the EXT_LOAD pad to the battery charger input. Connect the battery charger ground to the GND pad next to the EXT_LOAD pad. 6) Connect the battery charger positive output to the CHARGER pad on the EV kit. Connect the battery charger ground to the EV kit GND pad near the CHARGER pad. JU2, JU3 2 3-pin headers None 4 Shunts (JU2–JU5) JU4, JU5 2 2-pin headers U1 1 MAX1773EUP (20-pinTSSOP) U2 1 MAX1615EUK (5-pin SOT23) U3, U4 2 MAX4066CEE (16-pin QSOP) U5 1 SN74AHC14PWR (14-pin TSSOP) U6 1 MAX6816EUS-T (4-pin SOT143) None 1 MAX1773 PC board None 1 MAX1773 data sheet None 1 MAX1773 EV kit data sheet Component Suppliers SUPPLIER AVX PHONE FAX 803-946-0690 803-626-3123 Central 516-435-1110 516-435-1824 Fairchild 408-822-2000 408-822-2102 Kemet 864-963-6300 864-963-6521 Panasonic 201-392-7522 201-392-4441 Taiyo Yuden 408-573-4150 408-573-4159 Note: Please indicate that you are using the MAX1773 when contacting these component suppliers. 7) Connect two battery packs or two smart-battery packs (packs with an SBS-IF-compliant connector) to the battery terminals TB1 (A battery) and TB2 (B battery) on the EV kit. Observe the correct polarity during connection. If you are using non-SBS-IFcompliant batteries, add a 10kΩ pulldown resistor on the BATT_A_T and BATT_B_T pins on the battery side of connectors TB1 and TB2. 8) Connect a voltmeter to the EXT_LOAD and GND pads. 9) Turn on the power supply, and verify that the EXT_LOAD output voltage is approximately +28V. 10)Connect a voltmeter to test point 1 (TP1) and ground. Rotate potentiometer R6 to obtain 1.5V at TP1 (battery minimum voltage level = 7.5V). For instructions on using the SMBUS interface, see the SMBus Interface section. Detailed Description The MAX1773 EV kit circuit routes charge and discharge currents between two battery packs (regular or smart), a buck step-down battery charger (MAX1772 EV kit recommended), and an AC adapter or DC power source. The circuit uses a MAX1773 in a 20-pin TSSOP package to control seven steering P-channel MOSFET 2 _______________________________________________________________________________________ MAX1773 Evaluation Kit MAX1773 EV KIT CHARGER Evaluates: MAX1773 BATTERY B GND TB2 B+ GND BATTERY CHARGER EXT_LOAD INPUT GND A+ TB1 GND ADAPTER_IN GND OUTPUT BATTERY A [DC SUPPLY] Figure 1. Connection Diagram switches. A MAX1615 low-power linear regulator provides the circuit board’s +3.3V power for logic ICs and status LEDs. The EV kit’s AC-adapter input (ADAPTER_IN) range is from +4.75VDC to +28VDC. A battery minimum voltage-level potentiometer (R6) allows easy adjustment of the level from +4.65V to +13V. Upon reaching this threshold, an automatic switchover between batteries occurs. See the Battery Minimum Voltage-Level Adjustment section for more information on adjusting the level. The EV kit features an SMBus signal multiplexer for smart battery packs. Two MAX4066 CMOS analog switches and a 74AHC14 inverter are used for multiplexing SMBus signals between both batteries. Manually operated switches (SW1, SW2) are provided to select between battery A or B selection and SMBus multiplexer battery A or B data selection. LEDs indicate the status of the AC adapter and battery. The LEDs are driven by a pair of inverters and can be disabled by jumpers. Jumpers are provided to disable the CMOS analog switches, CMOS switch debouncer, and inverter ICs for evaluating power usage. Jumper Selection Inverter Shutdown Mode The MAX1773 EV kit features a shutdown mode for the inverters (U5) to reduce the EV kit’s overall current. The 2-pin jumper, JU1, selects the shutdown mode for the inverters. Table 1 lists the selectable jumper options. Table 1. Jumper JU1 Functions SHORT LOCATION INVERTER (U5) VCC PIN INVERTER OUTPUT 1 and 2 (PC trace shorted) Connected to +3.3V Inverters powered up None (PC trace short cut open) None Inverters powered down, inverter shutdown mode AC_PRESENT LED Shutdown The EV kit features a jumper to enable or disable the AC_PRESENT LEDs. The 3-pin jumper, JU2, selects the mode for the inverters driving the LEDs. Table 2 lists the jumper options. BATT_STAT LED Shutdown The MAX1773 EV kit features a jumper to enable or disable the BATT_STAT LEDs. The 3-pin jumper, JU3, selects the mode for the inverters driving the LEDs. Table 3 lists the jumper options. _______________________________________________________________________________________ 3 Evaluates: MAX1773 MAX1773 Evaluation Kit Table 2. Jumper JU2 Functions SHUNT LOCATION INVERTER (U5B) INPUT PIN LED OPERATING MODE 1 and 2 AC_PRESENT signal feeds inverter AC_PRESENT LED state driven by MAX1773 2 and 3 AC_PRESENT signal bypassed AC_PRESENT LED state forced off Table 3. Jumper JU3 Functions SHUNT LOCATION INVERTER (U5E) INPUT PIN LED OPERATING MODE 1 and 2 BATT_STAT signal feeds inverter BATT_STAT LED state driven by MAX1773 and inverters 2 and 3 BATT_STAT signal bypassed BATT_STAT LED state forced off SMBus Pullup Resistors The MAX1773 EV kit features pullup resistors for the SMBUS CLK and DAT signals. The CLK and DAT pullup resistors (R16, R17) can be disabled by the 2pin jumpers JU4 and JU5, respectively. Tables 4 and 5 list the selectable jumper options. CMOS Analog Switches, Shutdown Mode The MAX1773 EV kit features a shutdown mode for the CMOS analog switches (MAX4066) to reduce the MAX1773 EV kit’s overall current. The 2-pin jumpers, JU6 and JU7, select the shutdown mode for the CMOS analog switches. Tables 6 and 7 list the selectable jumper options. Table 4. Jumper JU4 Functions SHUNT LOCATION 1 and 2 None 4 R16 RESISTOR CLK SIGNAL R16 connected to +3.3V CLK signal pulled up to +3.3V by R16 R16 is floating Multiplexer controls CLK Table 5. Jumper JU5 Functions SHUNT LOCATION R17 RESISTOR DAT SIGNAL 1 and 2 R17 connected to +3.3V DAT signal pulled up to +3.3V by R17 None R17 is floating Multiplexer controls CLK Table 6. Jumper JU6 Functions SHORT LOCATION SWITCH (U3) V+ PIN CMOS ANALOG SWITCHES 1 and 2 (PC trace shorted) Connected to +3.3V SMBus CMOS analog switches (U3) powered up None (PC trace short cut open) None SMBus CMOS analog switches (U3) powered down Table 7. Jumper JU7 Functions SHORT LOCATION SWITCH (U4) V+ PIN 1 and 2 (PC trace shorted) Connected to +3.3V None (PC trace short cut open) None CMOS ANALOG SWITCHES SMBus CMOS analog switches (U4) powered up SMBus CMOS analog switches (U4) powered down CMOS Switch Debouncer, Shutdown Mode The MAX1773 EV kit features a shutdown mode for the CMOS switch debouncer (MAX6816) to reduce the MAX1773 EV kit’s overall current. Two jumpers, JU8 and JU9, select the shutdown mode for the CMOS switch debouncer IC. Tables 8 and 9 list the selectable jumper options. Switch Selection Modes Battery Selection Interface The MAX1773 EV kit features a battery-pack selection interface to select which battery pack is connected to terminals TB1 (battery A) and TB2 (battery B) and may be charged. A three-position switch (SW1) is utilized to select which smart-battery pack will be controlled by the MAX1773 IC. _______________________________________________________________________________________ MAX1773 Evaluation Kit SHORT LOCATION VCC PIN CMOS SWITCH DEBOUNCERS 1 and 2 (PC trace shorted) Connected to +3.3V CMOS switch debouncer IC (U6) powered up None (PC trace short cut open) None CMOS switch debouncer IC (U6) powered down Table 9. Jumper JU9 Functions SHORT LOCATION OUT PIN 1 and 2 (PC trace shorted) None (PC trace short cut open) CMOS SWITCH DEBOUNCERS Table 11. Switch SW2 Functions SWITCH POSITION 1 INVERTER (U5A) INPUT PIN COMM CONTROLS Connected to +3.3V SMBus connected to battery B Connected to BATT_SEL input CMOS switch debouncer output 2 None, external controller toggles COMM pad None CMOS switch debouncer IC (U6) output floating External controller selects battery A (low) or battery B (high, +3.3V) for SMBus 3 Connected to GND SMBus connected to battery A The switch’s center position allows an external controller to select which battery is desired by pulling the BATT_SEL pad high or low. Table 10 lists switch SW1 options. Caution: Do not connect an external controller to the BATT_SEL pad while switch SW1 is in position 1 or 3 since the external controller may be damaged. SMBus Interface The MAX1773 EV kit features an SMBus signal multiplexer for the smart-battery packs connected to terminals (TB1, TB2) and the SMBus interface signals (CLK, DAT, T). A three-position switch (SW2) is utilized to Table 10. Switch SW1 Functions SWITCH POSITION select which smart-battery pack will be connected to the SMBus interface. The switch’s center position allows an external controller to select which battery is desired by pulling the COMM pad logic high or low. Table 11 below lists switch SW2 options. Jumpers JU4 and JU5 allow CLK and DAT to be pulled up to logic high with built-in resistors (R16, R17). See the SMBus Pullup Resistors section for jumper selection. MAX1773 BAT_SEL PIN BATT_SEL CONTROLS 1 Connected to +3.3V Battery B selected 2 None, external controller toggles BATT_SEL pad External controller selects battery A (low) or battery B (high, +3.3V) 3 Connected to GND Battery A selected Caution: Do not connect an external controller to the COMM pad while switch SW2 is in position 1 or 3 since the external controller may be damaged. Battery Minimum Voltage Level Battery Minimum Voltage Level Adjustment The MAX1773 EV kit features a potentiometer to adjust the battery minimum voltage level. Potentiometer R6 adjusts the battery minimum voltage level from +4.65V to +13V. The battery minimum voltage level is adjusted by the voltage at test point TP1. The battery minimum voltage level is equal to the voltage at TP1 multiplied by 5 (VTP1 x 5; i.e., +7.5V level = 1.5V x 5). Rotate R6 counterclockwise to decrease the battery minimum voltage level or clockwise to increase it. Using the MAX1772 EV Kit Charger with the MAX1773 EV Kit MAX1772 EV Kit Charger Connections The MAX1773 EV kit can be used with the MAX1772 EV kit charger. For correct connection between the two EV kits, jumper JU4 must be cut open on the MAX1772 EV kit. Refer to the MAX1772 EV kit data sheet for additional information on jumper JU4. Figure 2 shows how to connect the MAX1772 EV kit to a MAX1773 EV kit, AC adapter, two batteries, and a load. _______________________________________________________________________________________ 5 Evaluates: MAX1773 Table 8. Jumper JU8 Functions Evaluates: MAX1773 MAX1773 Evaluation Kit GND BATTERY B TB2 B+ CHARGER MAX1773 EV KIT GND EXT_LOAD GND ADAPTER_IN A+ TB1 GND GND BATTERY A GND LOAD DC AC ADAPTER OR DC SOURCE EXTLOAD ADAPTER_IN MAX1772 EV KIT LOAD GND GND BATT Figure 2. MAX1772 EV Kit Charger to MAX1773 EV Kit Connection Diagram 6 _______________________________________________________________________________________ B GND J7 1 3 GND CHARGER J3 BATT_A+ BATT_SEL +3.3V J4 GND SW1 2 D1 2 1 OUT U6 MAX6816 IN GND VCC 3 4 R12 8.2K TP2 3 JU9 JU8 CHGA DISA 2 THMA 1 BATA 5 COMA 4 U1 R13 8.2k DISB CHGB +3.3V B 12 11 6 7 15 14 18 17 TP6 R14 8.2k TP5 +3.3V BATT_B_T EXT_LOAD TP7 R11 510k U2 MAX1615 C11 R5 0.33µF 28.7k 1% GND 1 IN 5 SHDN C6 0.1µF 2 19 THMB 20 BATB 16 COMB ACPRES BATSTAT GND MINV VDD TCOMP 8 EXTLD MAX1773 9 PDS TP8 10 ACDET 13 BATSEL TP9 R4 3.3k EXT_LOAD TP4 C12 0.1µF P2 TP3 R1 100k 1% BATT_A_T CHARGER P1 P3 C13 1.5µF 25V C1 0.1µF P7 4 3 P4 P6 P5 R3 100k 1% R2 10k 1% C14 1.5µF BATT_B+ R7 40.2k 1% C7 4.7µF CHARGER 2 TP1 R6 3 100k 1 5/3 (FB) OUT +3.3V R10 510k 1 JU2 2 3 3 U5-B U5-E C4 OPEN 1 JU3 11 2 3 C3 33µF 35V 4 5 10 13 +3.3V U5-C U5-F C5 OPEN GND 6 12 J5 EXT_LOAD J2 R9 430Ω R8 430Ω AC_PRESENT D3 BATT_STAT D2 Evaluates: MAX1773 ADAPTER_IN J1 C2 33µF 35V EXT_LOAD MAX1773 Evaluation Kit Figure 3. MAX1773 EV Kit Schematic _______________________________________________________________________________________ 7 8 +3.3V 3 1 COMM SW2 COMM 2 +3.3V 1 U5–A 14 7 1 JU1 2 2 U5–D BATT_A_T 5 4 3 2 1 9 C10 0.1µF GND BATT_A_T BATT_A_DAT BATT_A_CLK BATT_A+ TB1 8 R18 10k +3.3V BATT_A+ +3.3V +3.3V 10 12 2 10 2 U4–C U4–D 15 U4–A 16 7 8 9 1 13 1 7 9 14 8 1 JU7 2 U3–C 15 U3–A 16 1 JU6 2 MAX4066 C9 0.1µF MAX4066 C8 0.1µF 4 13 4 6 14 6 U4–B U3–D U3–B 5 12 5 R15 10k +3.3V BATT_B+ COMM BATT_B_T 5 4 3 2 1 GND BATT_B_T BATT_B_DAT BATT_B_CLK BATT_B+ TB2 R16 10k JU4 R17 10k JU5 GND T DAT CLK +3.3V Evaluates: MAX1773 MAX1773 Evaluation Kit Figure 4. MAX1773 EV Kit Schematic, SMBus Signal Multiplexers _______________________________________________________________________________________ MAX1773 Evaluation Kit Evaluates: MAX1773 1.0" 1.0" Figure 5. MAX1773 EV Kit Component Placement Guide— Component Side 1.0" Figure 6. MAX1773 EV Kit PC Board Layout—Component Side 1.0" Figure 7. MAX1773 EV Kit PC Board Layout—Inner Layer 2 Figure 8. MAX1773 EV Kit PC Board Layout—Inner Layer 3 _________________________________________________________________________________________________ 9 Evaluates: MAX1773 MAX1773 Evaluation Kit 1.0" Figure 9. MAX1773 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.