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MAX17703EVKITA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX17703EVKITA Datasheet(HTML) 7 Page - Maxim Integrated Products |
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7 / 15 page  Maxim Integrated │ 7 www.maximintegrated.com Evaluates: MAX17703 in 4.2V Li-Ion Battery Charger Application MAX17703EVKITA# Evaluation Kit System Considerations The MAX17703 EV kit is designed to charge Li-ion bat- teries. When the load current is drawn during the battery charging process, the charging current available for bat- tery charging reduces. This influences the overall charg- ing time (in CC, CV states). The safety timer timeout (TFCHG) must be adjusted accordingly. Disable the timer function to charge the Li-ion batteries with a parallel sys- tem load current equal to or greater than the taper current threshold (ITCHG), to avoid undesired latched-fault in CC or CV states For safe operation, follow the procedure below while mak- ing connections: 1) Connect the battery terminals to the output of the charger circuit. Note that the output capacitors of the charger can draw current from the battery during a hot plug-in/connection process. 2) Connect the input power source to the battery char- ger circuit only after securely connecting the battery at the output. 3) Do not operate the charger without battery or pre- loaded supply. For more details about charger operation, refer to the MAX17703 IC data sheet. EV Kit Redesign Recommendation as per Custom Battery Charging Parameters The MAX17703EVKITA# is designed for 45Ahr, 4.2V Li-ion battery with a charging resistance of 15mΩ. For other battery specifications, the following battery charging parameters need to be considered to redesign the EV kit application circuit. Battery Charging Resistance (RBAT) The charger controller needs to be designed according to the battery charging resistance (RBAT). If the battery charging resistance is greater than 50mΩ, the compensa- tion capacitor (C17) on the EV kit needs to be redesigned using the following equation: E 0.8 L1 C17 R12 R × = × where: RE = RDCR + RS + RDS_ON(HS) x DMIN + RDS_ON(LS) x (1- DMIN ) + RBAT RDCR = DC resistance of inductor (L1) RS = Current-sense resistor value (R22) RDS_ON(HS), RDS_ON(LS) = Worst-case on-state resis- tances of high-side MOSFET (Q4) and low-side MOSFET (Q3), respectively VOUT = Desired regulation voltage across the battery VDCIN_MAX = Maximum operating input voltage OUT MIN DCIN_MAX V D V = Battery Charging Current (ICHGMAX) If the battery charging current in CC state needs to be increased greater than 10A and less than 6A, the following components on the EV kit might need to be redesigned: 1) Buck converter inductor (L1) 2) Current-sense resistor (R22) 3) ILIM resistor divider circuit (R8 and R9) 4) Input capacitance on VIN (refer to the Schematic) 5) Output capacitance on VOUT (refer to the Schematic) 6) Current regulation loop compensation (R12, C17, and C18) 7) Step-down converter nMOSFET selection (Q2, Q3, Q4, and Q5) 8) Input short-circuit protection external nMOSFET Selection (Q1) For the detailed design guidelines, refer to the MAX17703 IC data sheet. Battery Charging Voltage (VOUT) If the battery charging voltage in CV state needs to be changed, the following components on the EV kit might need to be redesigned: 1) Battery feedback resistor divider circuit (R25 and R26) 2) External power-supply input for EXT-LDO (EXTVCC) connection circuit (R15 and C23) 3) Buck converter inductor (L1) 4) Input capacitance on VIN (refer to the schematic) 5) Output capacitance on VOUT (refer to the schematic) 6) Step-down converter nMOSFET selection (Q2, Q3, Q4, and Q5) 7) Input short-circuit protection external nMOSFET selection (Q1) For detailed design guidelines, refer to the MAX17703 IC data sheet. |
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