BQ24250C_15 Datasheet, PDF (14/46 Pages) Texas Instruments – bq24250C 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Power-Path Management

bq24250C
SLUSBY7 – JULY 2014
8 Detailed Description
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8.1 Overview
The bq24250C is a highly-integrated, single-cell, Li-Ion battery charger with integrated current sense resistors
targeted for space-limited, portable applications with high-capacity batteries. The single-cell charger has a single
input that operates from either a USB port or AC wall adapter for a versatile solution.
The bq24250C device has two modes of operation: 1) I2C mode, and 2) standalone mode. In I2C mode, the host
adjusts the charge parameters and monitors the status of the charger operation. In standalone mode, the
external resistor sets the input-current limit, and charge current limit. Standalone mode also serves as the default
settings when a DCP adapter is present. It enters host mode while the I2C registers are accessed and the
watchdog timer has not expired (if enabled). The battery is charged in four phases: trickle charge, pre-charge,
constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction
temperature and reduces the charge current if the internal temperature threshold is exceeded.
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