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MAX17703EVKITA Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX17703EVKITA Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 15 page  Maxim Integrated │ 4 www.maximintegrated.com Evaluates: MAX17703 in 4.2V Li-Ion Battery Charger Application MAX17703EVKITA# Evaluation Kit Detailed Description The MAX17703EVKITA# (EV kit) provides a charging solu- tion for a 45Ahr Li-ion battery with a CC mode charging cur- rent of 10A (ICHGMAX) and a CV mode voltage of 4.2V from an 8.5V to 60V input supply. The EV kit features a 350kHz switching frequency for optimum efficiency and component size. The RT/SYNC PCB pad allows an external clock to synchronize the device. The EV kit includes jumper J1 to enable/disable the controller. The FLG1 and FLG2 PCB pads allow monitoring of the charger status. The ISMON PCB pad allows monitoring of the charging current. Enable/Undervoltage-Lockout (EN/UVLO) Programming The EV kit offers an adjustable input undervoltage lockout (UVLO) feature. Figure 3 shows the input undervoltage lockout setting on the EV kit. The input voltage above which the charger is enabled, can be set with a resistor-divider connected to EN/UVLO from DCIN to PGND. See Table 1 for jumper J1 settings. To enable the charger and set the UVLO, install the shunt across pins 1–2 on jumper J1. To disable the charger, install a shunt across pins 2–3 on jump- er J1. The VDCIN(MIN) is selected as 8.2V for this EV kit. Choose R1 as follows: DCIN(MIN) R1 (10000 V ) ≤× where VDCIN(MIN) is the voltage at which the device is required to turn on. Calculate the value of R2 using the following equation: EN_TH_R DCIN(MIN) EN_TH_R EN BIAS V R1 R2 V V (I R1) − × = − +× where: IEN-BIAS = Internal bias pullup current on the EN/ULVO pin (3µA) VEN_TH_R = EN/UVLO pin rising threshold voltage (1.25V) For more details about setting the undervoltage lockout level, refer to the MAX17703 datasheet. CC Mode Charging Current Setting (ILIM) The EV kit provides the CC mode charge current pro- gramming feature. The ILIM PCB pad on the EV kit sup- ports external control of the CC mode charging current (ICHGMAX). See Table 2 for jumper J2 settings. To fix the ICHGMAX at 10A, install a shunt across pins 1–2 on jumper J2. To control ICHGMAX, install a shunt across pins 2–3 on jumper J2 and apply a voltage (VILIM) between the ILIM_EXT test point and nearest SGND PCB pad. The allowable voltage range on ILIM_EXT is 0.9V to 1.5V. To fix the ICHGMAX at 6A, remove the shunt on jumper J2. For more details about the CC mode charging current set- ting, refer to the MAX17703 IC data sheet. Figure 3. Setting the Input Undervoltage Lockout Table 1. Charger Enable/Disable Jumper (J1) Settings Table 2. CC Mode Charging Current Jumper (J2) Settings *Default position. *Default position. JUMPER SHUNT POSITION EN/UVLO PIN CHARGER OPERATION J1 1–2* Connected to the input UVLO divider midpoint Enabled. UVLO level is set by the resistor divider from DCIN to SGND/EP 2–3 Connected to SGND/EP Disabled JUMPER SHUNT POSITION ILIM PIN ICHGMAX SETTING J2 1–2* Connected to VREF 10A 2–3 Connected to ILIM_EXT test point 6.67 x VILIM Not installed Connected to ILIM resistor divider (R8 and R9) midpoint 6A R1 R2 EN/UVLO DCIN D1 4.7V VDCIN(MIN) TO VDCIN(MAX) SGND/EP 3µA MAX17703 |
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