MAX77787JEVKIT#

MAX77787 Evaluation Kit General Description The MAX77787 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77787, standalone 3.15A USB Type-C® autonomous charger with JEITA. The MAX77787 can operate from 4.5V to 13.7V input, with a fast charge current up to 3.15A and a maximum input current limit of 3A. The MAX77787 is offered to support Liion batteries with JEITA compliance. It also has another option that supports LiFePO4 batteries with non-JEITA compliance. The EV kit features USB Type-C CC detection, battery charging compliant with the USB Battery Charging Specification Revision 1.2 (BC1.2), proprietary adapter detection upon input insertion, and automatic configuration of the charger input current limit to the maximum allowable current from the input source. The MAX77787 has the reverse-boost capability, which is enabled by the ENBST pin to allow the 5.1V/1.5A output to CHGIN. The EV kit includes the variable resistor and thermistor to demonstrate the JEITA compliance. Evaluates: MAX77787 Benefits and Features • Up to 16V Protection • 13.7V Maximum Input Operating Voltage • 3.15A Maximum Charging Current • 6A Discharge Current Protection • No Firmware or Communication Required • Integrated USB Detection • Integrated CC Detection for USB Type-C • Integrated BC1.2 Detection for Legacy SDP, DCP, and CDP • Automatic Input Current Limit Configuration • Input Voltage Regulation with Adaptive Input Current Limit (AICL) • 5.1V, 1.5A OTG Mode and BYP Reverse Boost • Termination Voltage • 4.1V to 4.55V for Li-ion and Li-poly Batteries • 3.6V/3.7V for LiFePO4 Battery • Safety • Charge Safety Timer • JEITA Compliance with NTC Thermistor (MAX77787J) • HOT/COLD Stop Charging with NTC Thermistor (MAX77787H) • Thermal Shutdown • Pin Control of all Functions • Resistor-Configurable Fast-Charge Current, Termination Voltage, and Input Current Limit • ENBST Pin to Enable and Disable Reverse Boost • STAT Pin to Indicate Charging Status • INOKB Pin to Indicate Input Power-OK (POK) • CHGENB Pin to Enable and Disable Charging • STBY Pin to Support Suspend Mode • THM Pin to Monitor Thermistor • Fixed Resistor Options to Easily set Fast-Charge Current, Termination Voltage, and Input Current Limit • Integrated Power Path • Integrated Battery True-Disconnect FET • Proven PCB Layout • Fully Assembled and Tested EV Kit Photo Figure 1. MAX77787 EV Kit Ordering Information appears at end of data sheet. 319-100838; Rev 0; 11/21 Evaluates: MAX77787 MAX77787 Evaluation Kit THM (J3) STBY ENBST (J5) (J4) IFC (J7) VSET (J8) INLIM (J9) CHGENB (J6) INLIM RESISTOR OPTIONS VSET RESISTOR OPTIONS THM RESISTOR OPTIONS USB TYPE-C CONNECTOR (J1) IFC RESISTOR OPTIONS MICRO-USB CONNECTOR (J2) Figure 2. Jumper and Resistor Options Location Quick Start EV Kit Default Setting INPUT CURRENT LIMIT FAST-CHARGE CURRENT TERMINATION VOLTAGE CHARGER REVERSE BOOST MODE SUSPEND MODE 3A 500mA 3.6V ON OFF OFF Note: To change the setting, see Table 1 for jumper positions. Required Equipment • • • • • • MAX77787 evaluation kit USB Type-C travel adapter and cable Power supply Battery, battery simulator, or power supply with electronic load Oscilloscope Multimeters www.analog.com Analog Devices | 2 Evaluates: MAX77787 MAX77787 Evaluation Kit Initial Test Setup The EV kit is fully assembled and tested. Follow the steps to verify board operation: 1. 2. 3. 4. Do not turn on the DC power supply until all connections are made. Confirm that all jumpers are at their default positions as indicated in Table 1. Connect the battery, battery simulator, or power supply to the loop labeled BATT and GND. Connect the power supply to the loop labeled CHGIN. Note that CHGIN can come from three sources (Micro-USB connector, USB TYPE-C Connector, or CHGIN loop), only one of these sources should be connected at any time. 5. The EV kit is now ready for use. Detailed Description of Hardware Follow the initial test setup procedure. Battery Charger Test Setup The battery charger can be tested in three different ways; with a battery, battery simulator, or power supply with an electronic load. Typical bench setups for MAX77787 the EV kit with different configurations are shown in Figure 3, Figure 4 and Figure 5. Battery 1) Connect the 1 cell battery pack and current meter between BATT and GND. Note: Only use a battery with a charge termination voltage that matches that of the jumper setting on the board. 2) Connect the 5.0V/5.0A current-limited DC power supply between CHGIN and GND and turn it on. 3) Observe the current reading from the current meter. If the battery is discharged, the fast-charging current should match the setting with the external IFAST resistor (R7/R8/R9). If the battery is not discharged, it could be in a top-off state or done state. The current reading could be top-off current (match the jumper setting on the board) or done state (~0A). BATTERY PACK WITHOUT THERMISTOR CHGIN CHGINS POWER SUPPLY PVL R3 10kΩ (DEFAULT) MAX77787 EV KIT V BATT A THM BATTS J3 (3-4) 1 CELL BATTERY PACK (WITHOUT THERMISTOR) V RT1 (-T) GND2 GND6 BATTERY PACK WITH THERMISTOR CHGIN CHGINS POWER SUPPLY PVL R3 10kΩ (DEFAULT) MAX77787 EV KIT V GND6 BATT A THM BATTS J3 (OPEN) V -T 1 CELL BATTERY PACK (WITH THERMISTOR) GND2 Note: The thermistor installed on the evaluation kit (RT1) has R25 of 10kΩ with a beta of 3435. R3 can be changed from the default 10kΩ, but the thermistor must be changed to match R25 = R3 to maintain VTHM/VPL ratio = 0.5 at +25°C. For more details on selection of the thermistor, refer to the MAX77787 data sheet. Figure 3. Battery Charger Test with Real Battery Pack www.analog.com Analog Devices | 3 Evaluates: MAX77787 MAX77787 Evaluation Kit Battery Simulator 1) Connect the battery simulator between BATT and GND, adjust the voltage to 3.8V with 3.5A current limit, and turn it on. 2) Connect the 5.0V/5.0A current-limited DC power supply between CHGIN and GND and turn it on. 3) Observe the current reading from the battery simulator and see if the fast-charging current matches with the external IFAST resistor. CHGIN BATT CHGINS BATTS A POWER SUPPLY MAX77787 EV KIT V V GND6 BATTERY SIMULATOR GND2 Figure 4. Battery Charger Test with Battery Simulator Power Supply with Electronic Load 1) Connect the power supply between BATT and GND and adjust the voltage to 3.8V with 3.5A current limit. 2) Connect the electronic load between BATT and GND and set the load current to 3.5A. 3) Turn on the power supply and electronic load. 4) Connect the 5.0V/5.0A current-limited DC power supply between CHGIN and GND and turn it on. 5) Observe the current reading from the current meter 1 and 2 (the fast-charging current equals I2-I1) and see if this value matches with the external IFAST resistor. CHGIN BATT CHGINS BATTS A POWER SUPPLY MAX77787 EV KIT V V GND6 I1 POWER SUPPLY A I2 ELECTRONIC LOAD GND2 Figure 5. Battery Charger Test with Power Supply and Electronic Load www.analog.com Analog Devices | 4 Evaluates: MAX77787 MAX77787 Evaluation Kit Table 1. Default Shunt Positions and Jumper Descriptions JUMPER # DEFAULT POSITION FUNCTION Short 1-2: Connect THM pin to a variable resistor J3 Short 5-6 Short 3-4: Connect THM pin to a thermistor Short 5-6: Connect THM pin to a fixed value resistor 10K Short 7-8: Connect THM pin to GND J4 Short 2-3 J5 Short 2-3 J6 Short 2-3 Short 1-2: Enable OTG Reverse Boost Short 2-3: Connect ENBST pin to GND Short 1-2: Enable USB Suspend Mode Short 2-3: Connect STBY pin to GND Short 1-2: Disable Charging Short 2-3: Connect CHGENB to GND Short 1-2: Connect IFAST pin to a fixed value resistor 24.9K (IFAST = 3.15A) Short 3-4: Connect IFAST pin to a fixed value resistor 2.43K (IFAST = 0.5A) J7 Short 3-4 Short 5-6: Connect IFAST pin to a fixed value resistor (open for user’s choice of resistor value) 7-8: Not in use Short 1-2: Connect VSET pin to a fixed value resistor 24.9K (VSET = 3.6V) Short 3-4: Connect VSET pin to a fixed value resistor 2.43K (VSET = 4.55V) J8 Short 1-2 Short 5-6: Connect VSET pin to a fixed value resistor (open for user’s choice of resistor value) 7-8: Not in use Short 1-2: Connect INLIM pin to a fixed value resistor 24.9K (INLIM = 0.5A) Short 3-4: Connect INLIM pin to a fixed value resistor 2.43K (INLIM = 3A) J9 Short 3-4 Short 5-6: Connect INLIM pin to a fixed value resistor (open for user’s choice of resistor value) 7-8: Not in use Table 2. Mode Configuration by External Pins CHGENB ENBST STBY CHGIN FET QBAT MODE J6 (1-2) J4 (2-3) J5 (2-3) ON OFF Buck = ON, Charging = OFF J6 (1-2) J4 (2-3) J5 (1-2) OFF OFF Invalid J6 (1-2) J4 (1-2) J5 (2-3) ON OFF Invalid J6 (1-2) J4 (1-2) J5 (1-2) OFF OFF Invalid J6 (2-3) J4 (2-3) J5 (2-3) ON ON Buck = ON, Charging = ON J6 (2-3) J4 (2-3) J5 (1-2) OFF ON Suspend Mode J6 (2-3) J4 (1-2) J5 (2-3) ON ON OTG Reverse-Boost Mode J6 (2-3) J4 (1-2) J5 (1-2) OFF ON BYP Reverse-Boost Mode www.analog.com Analog Devices | 5 Evaluates: MAX77787 MAX77787 Evaluation Kit BC1.2 and CC Detection Test Setup 1) Connect the battery/battery simulator/power supply with an electronic load between BATT and GND. See the Battery Charger Test Setup section for details. 2) Plug in the USB Type-C cable from the PC or AC adaptor. 3) MAX77787 automatically sets the CHGIN input current limit based on the charger type detection results. If the input source is not a standard power source described by BC1.2, USB Type-C or proprietary charger type that the MAX77787 can detect, the MAX77787 sets the input current limit according to RINLIM. In the case of floating RINLIM, the MAX77787 input current limit is set to 0.5A when an unknown proprietary charger is detected. OTG Reverse Boost Test Setup 1) Connect the power supply between BATT and GND, adjust the voltage to 3.8V with 3.5A current limit, and turn it on. 2) Apply the Jumper 4 to enable the OTG reverse-boost mode. 3) Monitor the voltage of CHGIN at CHGINS test point and see whether it equals 5.1V. Note that VCHGIN must be lower than 0.7V before ENBST is enabled. Otherwise, CHGIN does not supply current when ENBST is enabled. BYP Reverse Boost Test Setup 1) Connect the power supply between BATT and GND, adjust the voltage to 3.8V with 3.5A current limit, and turn it on. 2) Apply the Jumper 4 and Jumper 5 to enable the BYP reverse-boost mode. 3) Monitor the voltage of BYP at BYPS test point and see whether it equals 5.1V. LED Indicator 1) Two LED indicators are installed on the EV kit: DS1 (green) is for the STAT pin and DS2 (red) is for INOKB. 2) The STAT pin is an open-drain and active-low output that indicates charge status. See Table 3 for details. 3) INOKB is an open-drain and active-low output that indicates the input status. If a valid input source is inserted and the buck converter starts switching, INOKB pulls low. When the reverse boost is enabled, INOKB pulls low to indicate the 5V output from CHGIN. Table 3. STAT Output with Charging Status CHARGING STATUS STAT LOGIC STATE CHARGE STATUS LED No Input High Impedance High Off Trickle, Pre-charge, Fast Charge Repeat Low and High Impedance with 1Hz, 50% duty cycle After an external diode and a capacitor rectifier, High Blinking with 1Hz, 50% duty cycle Top-Off and Done Low Low Solid On Faults High Impedance High Off www.analog.com Analog Devices | 6 Evaluates: MAX77787 MAX77787 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE MURATA 770-436-1300 www.murata-northamerica.com SAMTEC 800-726-8329 www.samtec.com TAIYO-YUDEN 603-669-7587 www.t-yuden.com TDK 847-803-6100 www.tdk.com VISHAY 408-970-5852 www.vishay.com CYNTEC 510-668-5167 www.cyntec.com PANASONIC 800-344-2112 www.panasonic.com Note: Indicate that you are using MAX77787 when contacting these component suppliers. Ordering Information PART NUMBER IC TYPE THERMAL PROTECTION BATTERY CHEMISTRY MAX77787JEVKIT# MAX77787JEWX+ EV Kit JEITA Li-ion Li-polymer MAX77787HEVKIT# MAX77787HEWX+ EV Kit HOT/COLD STOP LiFePO4 #Denotes RoHS-compliant. MAX77787 EV Kit Bill of Materials QTY REF DES MFG PART# MANUFACTURER VALUE MINIMAL BILL OF MATERIALS FOR MAX77787 AUTONOMOUS CHARGER WITH JEITA C1005X5R1A225K050BC TDK 2.2µF; 10%; 10V; X5R; SMT (0402); CERAMIC C2 EMK105ABJ225MV; GRM155R61C225ME11 TAIYO YUDEN; KEMET 2.2µF; 20%; 16V; X5R; SMT (0402); CERAMIC 1 C3 C1608JB1C106M080AB TDK 10µF; 20%; 16V; JB; SMT (0603); CERAMIC 1 C4 GRM155R61C104KA88 MURATA 0.1µF; 10%; 16V; X5R; SMT (0402); CERAMIC 3 C5, C7, C9 C1608X5R1A106K080AC TDK 10µF; 10%; 10V; X5R; SMT (0603); CERAMIC 1 C6 ANY ANY 22µF; 16V; 10%; X5R; SMT (0805); CERAMIC 1 L1 HTEH25201T-R47MSR-63 CYNTEC 0.47µH; ±20%; 5.6A 1 RT1 NCP15XH103F03 MURATA 10KΩ; ±1%; SMT (0402); THERMISTOR; THICK FILM 1 R3 CRCW040210K0FK; RC0402FR0710KL VISHAY DALE; YAGEO PHICOMP 10KΩ; 1%; SMT (0402); ±100PPM/°C; 0.063W 3 R7, R10, R14 ERJ-2RKF2492 PANASONIC 24.9KΩ; 1%; SMT (0402); ±100PPM/°C; 0.063W 1 U1 MAX77787 MAXIM MAX77787JEWX+ 2 C1, C8 1 OTHER COMPONENTS FOR EVALUATION KIT www.analog.com Analog Devices | 7 Evaluates: MAX77787 MAX77787 Evaluation Kit QTY REF DES 0 C10 N/A N/A NOT INSTALLED 1 R1 CRCW040210K0FK; RC0402FR0710KL VISHAY DALE; YAGEO PHICOMP 10KΩ; 1%; SMT (0402); ±100PPM/°C; 0.063W 1 R2 3296Y-1-503LF BOURNS 50KΩ; 10%; THROUGHHOLE-RADIAL LEAD; 0.5W 3 R4, R13, R17 N/A N/A NOT INSTALLED 2 R5, R6 CR0402-16W-1651FT; CRCW04021K65FK VENKEL LTD.; VISHAY DALE 1.65KΩ; 1%; SMT (0402); ±100PPM/°C; 0.063W 3 R8, R11, R15 ERJ-2RKF2431 PANASONIC 2.43KΩ; 1%; SMT (0402); ±100PPM/°C; 0.1W 0 R9, R12, R16 N/A N/A 1 J1 12401832E402A AMPHENOL 1 J2 10118193-0001LF FCI CONNECT 4 J3, J7-J9 PEC04DAAN SULLINSELECTRONICS CORP. 3 J4-J6 TSW-103-07-T-S SAMTEC CONNECTOR; THROUGHHOLE; SINGLE ROW; STRAIGHT; 3 PINS 10 BATT, BYP, CHGIN, GND1-GND6, SYS 9020 BUSS WEICO WIRE MAXIM PAD; WIRE; SOLID; 20AWG 5000 KEYSTONE TEST POINT; RED 5002 KEYSTONE TEST POINT; WHITE 12 5 BATTS, BYPS, CC1, CC2, CHGINS, DN, DP, GNDS, LX, PVL, SYSS, THM CHGENB, ENBST, INOKB, STAT, STBY MFG PART# MANUFACTURER VALUE NOT INSTALLED FEMALE; USB TYPE C CONNECTOR FEMALE; MICRO USB B TYPE RECEPTACLE CONNECTOR; MALE; THROUGH-HOLE; STRAIGHT; 8 PINS 1 DS1 SML-311YTT86 ROHM LED; SMT (0603); YELLOW; VF = 1.8V; IF = 0.02A; -30°C TO +85°C 1 DS2 SML-311UT ROHM LED; SMT (0603); RED; VF = 1.8V; IF = 0.02A; -30°C TO +85°C 4 MH1-MH4 9032 KEYSTONE ROUND-THRU HOLE SPACER; NYLON 1 MISC1 AK67421-1-R ASSMANN USB2.0 MICRO CONNECTION CABLE 6 SU4-SU9 S1100-B; SX1100-B; STC02SYAN KYCON; KYCON; SULLINS ELECTRONICS CORP. JUMPER; BLACK; TOTAL LENGTH = 0.24IN 1 PCB MAX77787 MAXIM MAX77787JEVKIT# www.analog.com Analog Devices | 8 Evaluates: MAX77787 MAX77787 Evaluation Kit MAX77787 EV Kit Schematic www.analog.com Analog Devices | 9 Evaluates: MAX77787 MAX77787 Evaluation Kit MAX77787 EV Kit PCB Layout MAX77787 EV Kit Component Placement Guide—Top Silkscreen MAX77787 EV Kit PCB Layout—Layer 2 MAX77787 EV Kit PCB Layout—Top MAX77787 EV Kit PCB Layout—Layer 3 www.analog.com Analog Devices | 10 Evaluates: MAX77787 MAX77787 Evaluation Kit MAX77787 EV Kit PCB Layout (continued) MAX77787 EV Kit PCB Layout—Bottom www.analog.com Analog Devices | 11 Evaluates: MAX77787 MAX77787 Evaluation Kit Revision History REVISION NUMBER 0 REVISION DATE 11/21 DESCRIPTION Initial release PAGES CHANGED — Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. w w w . a n a l o g . c o m Analog Devices | 12