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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3913 датащи(PDF) 41 Page - Texas Instruments |
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LP3913 датащи(HTML) 41 Page - Texas Instruments |
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41 / 70 page  Li - Ion Cell Q 2 Q1 USBPWR ADAPTER VDD VBATT xxxxx xxxxx xxxxx xxxxx LP3913 www.ti.com SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013 charger. 2. USB power is present and supplies the system and the battery. 3. USB power is present but the system demand exceeds the USB current limit, so that the battery provides the additional power to operate the system. 4. The battery is the sole supply source to the system when no external power source is present The current flows in the different modes are realized through internal FETS and an external Schottky as illustrated as follows: 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. Power Route Q1 Q2 Regulated adapter supply & OFF Regulated battery charging USB supply & battery ON Regulated charging No external supply & battery OFF ON discharging The Power Routing function will allocate 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. USB Suspend Mode The LP3913 USB current consumption can be disabled during suspend mode through a dedicated pin (USBSUSP). Applying a logic 1 to this pin will disable the USB current path and current is reduced to input leakage current less than 30 µA on the USBPWR pin. Setting the USB Current Limit The USB current that is available from the USB on the VBUS wire is limited by default to 100 mA. More current (up to 800 mA) can be negotiated through a session request protocol between host and peripheral. The USB current limit needs to be signaled to the LP3913 by means of the USBISEL pin or the ILIMIT Register as indicated below. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 41 Product Folder Links: LP3913 |
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