BQ25071-Q1 Datasheet, PDF (9/22 Pages) Texas Instruments – Automotive Qualified

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8 Detailed Description
bq25071-Q1
SLUSCD6 – APRIL 2016
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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