Summary of BQ25171-Q1 – 800-MA LINEAR BATTERY CHARGER FOR 1- TO 2-CELL LI-ION, LIFEPO4, AND 1- TO 6-CELL NIMH
Texas Instruments bq25171-Q1 is an automotive-rated linear battery charger providing up to 800 mA for 1–2 cell Li-Ion/Li-Polymer/LiFePO4 and 1–6 cell NiMH batteries. It supports a single power output that can charge a battery while sharing current with a parallel system load, provided the load does not prevent full charging within the safety timer. Li-Ion charging uses precharge, constant-current fast charge, and voltage regulation; NiMH charges in constant current until the timer expires or VOUT_OVP is reached. The device monitors junction temperature and reduces charge current if TREG is exceeded; it is AEC-Q100 qualified.
Parts used in the bq25171-Q1 Project:
- Texas Instruments bq25171-Q1 linear battery charger IC
- Li-Ion or Li-Polymer battery (1- to 2-cell)
- LiFePO4 battery (1- to 2-cell)
- NiMH battery (1- to 6-cell)
- System load connected in parallel with the battery
- Power source/input to the charger IC
- PCB and supporting passive components for IC integration
Texas Instruments bq25171-Q1 Linear Battery Charger is an automotive rated 800mA linear charger for 1-cell and 2-cell Li-Ion, Li-Polymer, and LiFePO4, in addition to 1-cell up to 6-cell NiMH battery applications.
The device has a single power output that charges the battery. The system load can be placed in parallel with the battery as long as the average system load does not prevent the battery from charging fully within the safety timer duration. When the system load is placed in parallel with the battery, the charge current is shared between the system and the battery.
The Texas Instruments bq25171-Q1 has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity. The device charges a NiMH in constant current mode only and terminates the charge cycle when the programmable timer expires or the battery voltage exceeds the VOUT_OVP threshold. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold, TREG, is exceeded.
Features
- AEC-Q100 qualified for automotive applications
- –40°C ≤ TA ≤ 125°C temperature grade 1
- HBM ESD classification level 2
Read more: BQ25171-Q1 – 800-MA LINEAR BATTERY CHARGER FOR 1- TO 2-CELL LI-ION, LIFEPO4, AND 1- TO 6-CELL NIMH
- Can the bq25171-Q1 charge Li-Ion batteries?
Yes, it charges 1- to 2-cell Li-Ion batteries using precharge, constant-current fast charge, and voltage regulation phases. - Can the bq25171-Q1 charge NiMH batteries?
Yes, it charges 1- to 6-cell NiMH batteries in constant current mode and terminates on timer expiry or when battery voltage exceeds VOUT_OVP. - Does the bq25171-Q1 allow a system load in parallel with the battery?
Yes, a system load can be placed in parallel as long as the average system load does not prevent the battery from fully charging within the safety timer. - How much charge current does the bq25171-Q1 provide?
It is rated for 800 mA linear charge current. - What thermal protection does the bq25171-Q1 have?
An internal control loop monitors IC junction temperature and reduces charge current if the internal temperature threshold TREG is exceeded. - What termination methods are used for NiMH charging?
NiMH charging terminates when the programmable timer expires or when battery voltage exceeds VOUT_OVP. - Is the bq25171-Q1 qualified for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications. - What temperature range is the bq25171-Q1 rated for?
It supports a temperature grade of 40°C to 125°C ambient (TA) for grade 1. - What ESD classification does the bq25171-Q1 have?
It has HBM ESD classification level 2.
