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MAX17703EVKITA Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX17703EVKITA Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 15 page  Maxim Integrated │ 5 www.maximintegrated.com Evaluates: MAX17703 in 4.2V Li-Ion Battery Charger Application MAX17703EVKITA# Evaluation Kit Deeply Discharged Battery Detection and Preconditioning The EV kit features deeply-discharged battery detection and preconditioning of the Li-ion battery. The deeply dis- charged battery voltage level is set at 3V on the EV kit as per a typical 4.2V/45Ahr Li-ion battery specification. If the battery voltage detected is less than 3V across the EV kit output, then the charger enters a precharge state. In precharge state, the charging current is set at 1/10th of ICHGMAX (1A) and the safety timer counter starts. If the EV kit output is not reached above 3V within the precharge-timer timeout (1.3 hours), the charger enters a latched-fault state. Otherwise, the charger enters CC state. For the deeply discharged battery voltage-level setting other than 3V, R3 and R4 components needs to be changed on the EV kit. Use the following equations to calculate the required R3 and R4 values for the deeply discharged battery voltage-level setting (VOUTDD). Select R3 in the range of 50kΩ to 100kΩ. OUTDO R3 R4 V 1 1.25 = − For more details about the battery precharge-state detec- tion mechanism, refer to the MAX17703 IC data sheet. Battery Operating Temperature Range Setting (TEMP) The EV kit features battery operating temperature range setting (TEMP) and charges only when the battery tem- perature is within the programmed operating temperature range using a negative temperature coefficient (NTC) thermistor. Figure 4 shows the TEMP setting on the EV kit. The battery operating temperature range setting on the EV kit is +5°C to +45°C. See Table 3 for jumper J3 settings. To disable the TEMP feature, install a shunt across pins 1–2 on jumper J3. To enable the TEMP fea- ture, install a shunt across 2–3 on jumper J3, and connect a 47kΩ NTC thermistor (with B-constant (25°C - 85°C) = 4108, packed out with EV kit) at the RT1 PCB footprint on the EV kit. The NTC thermistor head should be attached on the battery to sense the battery temperature. For changing the battery operating temperature range, use the following equations to calculate the required R6 and R7 values for the desired battery operating tempera- ture range. ( ) ( ) NTCCOLD NTCHOT NTCCOLD NTCHOT NTCCOLD NTCCOLD 1.25 R R R7 R 2.25 R 0.67 R R7 R6 R R7 ×× = − × ×× = + where: RNTCCOLD = Resistance value of the 47kΩ NTC thermis- tor at minimum battery-operating temperature limit RNTCHOT = Resistance value of the 47kΩ NTC thermistor at maximum battery-operating temperature limit Figure 4. Setting the Battery Operating Temperature Range Table 3. TEMP Feature Jumper (J3) Settings *Default position. JUMPER SHUNT POSITION TEMP CONNECTION SETTING TEMP FEATURE J3 1-2* Connected to the 47kΩ resistor (R5) Disabled 2-3 Connected to the 47kΩ NTC thermistor (RT1) Enabled, set the operating battery temperature range of +5°C to +45°C R6 R7 TEMP VREF SGND/EP MAX17703 RT1 ON BATTERY |
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