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BQ24295RGER Datasheet(PDF) 25 Page - Texas Instruments |
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BQ24295RGER Datasheet(HTML) 25 Page - Texas Instruments |
25 / 45 page 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 BAT (V) 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 SYS (V) Charge Disabled Charge Enabled Minimum System Voltage bq24295 www.ti.com SLUSBC1 – SEPTEMBER 2013 When the battery charging is disabled or terminated, the system is always regulated at 150mV above the minimum system voltage setting. The status register REG08[0] goes high when the system is in minimum system voltage regulation. Figure 24. V(SYS) vs V(BAT) Dynamic Power Management To meet maximum current limit in USB spec and avoid over loading the adapter, the device features Dynamic Power Management (DPM), which continuously monitors the input current and input voltage. When input source is over-loaded, either the current exceeds the input current limit (REG00[2:0]) or the voltage falls below the input voltage limit (REG00[6:3]). The device then reduces the charge current until the input current falls below the input current limit and the input voltage rises above the input voltage limit. When the charge current is reduced to zero, but the input source is still overloaded, the system voltage starts to drop. Once the system voltage falls below the battery voltage, the device automatically enters the supplement mode where the BATFET turns on and battery starts discharging so that the system is supported from both the input source and battery. During DPM mode (either VINDPM or IINDPM), the status register REG08[3] will go high. Figure 25 shows the DPM response with 5V/1.2A adapter, 3.2V battery, 2.0A charge current and 3.4V minimum system voltage setting. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: bq24295 |
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