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BQ25071QWDQCTQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ25071QWDQCTQ1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page 9 bq25071-Q1 www.ti.com SLUSCD6 – APRIL 2016 Product Folder Links: bq25071-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The bq25071-Q1 is a highly integrated, automotive qualified, linear, LiFePO4 battery charger targeted at space- limited automotive applications. It accepts power from either a USB port or AC adapter and charges a single-cell LiFePO4 battery with up to 1 A of charge current. The 30 V input rating with 10.5 V input overvoltage protection supports low-cost unregulated adapters. The bq25071-Q1 has a single power output that simultaneously charges the battery and powers the system. The input current is programmable from 100 mA up to 1 A using the ISET input or configurable for USB500. There is also a 4.9 V ±10% 50 mA LDO is integrated into the IC for supplying low power external circuitry. The LiFePO4 charging algorithm removes the constant voltage mode control typically used in Li-Ion battery charge cycles which reduces charge time significantly. Instead, the battery is fast charged to the overcharge voltage and then allowed to relax to a lower float charge voltage threshold. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, and charge status display. During the charge cycle, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. |
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