5 Description (continued)
The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and
constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included
that monitors battery temperature and automatically changes charge parameters to prevent the battery from
charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance
to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the
device can run from a battery up to 4.65 V.
A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual
reset with timer allows mutliple different configuration options for wake are reset optimization. A simple voltage
based monitor provides battery level information to the host in 2% increments from 60% to 100% of the
programmed V
(BATREG)
.
6 Device Comparison Table
PART NUMBER
VINDPM
DEFAULT SYS
OUTPUT
DEFAULT LDO
OUTPUT
DEFAULT VBERG
DEFAULT CHARGE
CURRENT
DEFAULT
TERMINATION
CURRENT
BQ25123
Enabled
1.25 V
3 V
4.2 V
10 mA
2 mA
SLUSCZ6A – JANUARY 2018 – REVISED MAY 2021
Copyright © 2021 Texas Instruments Incorporated
3
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