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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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ADP5350ACPZ-1-R7 Datenblatt(PDF) 21 Page - Analog Devices |
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ADP5350ACPZ-1-R7 Datenblatt(HTML) 21 Page - Analog Devices |
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21 / 63 page  Data Sheet ADP5350 Rev. B | Page 21 of 63 THEORY OF OPERATION BATTERY CHARGER OVERVIEW The ADP5350 integrates a fully I2C-programmable charger for single-cell Li-Ion or Li-Ion polymer batteries suitable for a wide range of portable applications. Figure 40 shows the complete charge cycle of the ADP5350 when VBUSx is connected. The ISOS pin voltage remains at VISOS_TRK when the device is not charging or when it is in trickle charge mode. When the device begins a fast charge, the VISOS voltage follows the battery voltage until the charge is complete. The charge current keeps constant in CC mode and reduces to IEND in CV mode. When the battery voltage, VISOB, drops to VTRM − VRCH, the charger resumes to charge until the charge completes. The highly efficient switch dc-to-dc architecture enables higher charging currents as well as a lower temperature charging operation that results in faster charging times. The charger of the ADP5350 operates from an input voltage from 4 V to 5.4 V but is tolerant of voltages of up to 20 V. This tolerance alleviates concerns about USB bus spiking during disconnection or connection. The ADP5350 features an internal FET between the dc-to-dc charger output and the battery. This FET permits battery isolation and, therefore, system powering in a dead battery or no battery scenario, which allows immediate system function upon connection to a USB power supply. The charger of the ADP5350 is fully compliant with the USB 3.0 specification and enables charging via the mini USB VBUSx pin from a wall charger, car charger, or USB host port. Based on the type of USB source, which is detected by an external USB detection device, the ADP5350 can be set to apply the correct current limit for optimal charging and USB compliance. The USB charger permits correct operation under all USB compliant sources, such as wall chargers, host chargers, hub chargers, and standard hosts and hubs. A processor is able to control the USB charger using the I2C to program the charging current and numerous other parameters, including • Trickle charge current level and voltage threshold • Fast charge (CC) current level • Fast charge (CV) voltage level • Fast charge safety timer period • Watchdog safety timer parameters • Weak battery threshold detection • End of charge current level for charge complete • Recharge threshold • VBUSx input current limit • Charge enable and disable Figure 40. ADP5350 Battery Charging Profile VISOS VISOB IISOB CHARGE DISABLE TRICKLE CHARGE FAST CHARGE CC FAST CHARGE CV RECHARGE CHARGE COMPLETE CHARGE COMPLETE ITRK_DEAD VTRK_DEAD IEND ICHG VRCH VTRM VISOS_FC VISOS_TRK |
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