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LP3910 Datasheet(PDF) 41 Page - Texas Instruments |
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LP3910 Datasheet(HTML) 41 Page - Texas Instruments |
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41 / 72 page  Li - Ion Cell Q 2 Q1 USBPWR ADAPTER VDD VBATT xxxxx xxxxx xxxxx xxxxx LP3910 www.ti.com SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015 The current flows in the different modes are realized through internal FETS and an external Schottky as shown in Figure 62: Figure 62. Charging and Sourcing Current Paths The current provided by the external adapter power or USB power, when inserted, first supplies the system load; the remainder is used for charging. The different paths are configured through two internal power FETs, Q1 and Q2, and an external Schottky diode. Q1 is a power FET that is only active during USB charging. Q2 functions either as a linear power FET during charging or as a low RDSON switch when no external power is present, and the battery discharges to supply power to the system. Table 7. Power Routing Options POWER ROUTE Q1 Q2 Regulated adapter supply & battery OFF Regulated charging USB supply & battery charging ON Regulated No external supply and battery OFF ON discharging The power routing function allocates power to the system through the VDD pin and to the battery. VDD1, VDD2, VDD3, VIN1, VIN2, VIN3, and VIN4 must be connected together externally. VBATT1, VBATT2, and VBATT3 must be connected together externally. 8.3.14 Battery Monitor The battery voltage is monitored and invokes the power-off mode when the battery low threshold is breached for more than 5 ms (typical). The battery-low threshold DEFAULT is factory programmed. The battery low threshold range is 2.5 V to 3.5 V with steps of 50 mV. The battery-low threshold in the table below refers to a decreasing battery voltage. The threshold when the battery voltage is transitioning out of the VBATTLOW is 50 mV (typical) higher than the values listed in the table below due to a built-in hysteresis of 50 mV (typical). The battery low IRQ is triggered 200 mV above the battery low alarm threshold that powers down the device. This gives the user time for a controlled shutdown. Copyright © 2006–2015, Texas Instruments Incorporated Submit Documentation Feedback 41 Product Folder Links: LP3910 |
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