The RT9458 is a switch-mode single cell Li-Ion/Li-Polymer
battery charger for portable applications. It integrates a
synchronous PWM controller, power MOSFETs, input
current sensing, high accuracy voltage regulation and
charge termination circuits. The RT9458 also features USB
On-The-Go (OTG).
The RT9458 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including pre-charge mode, fast charge mode, and constant
voltage mode. The key charge parameters can be
programmed via the I2C interface. The RT9458 resumes
the charge cycle whenever the battery voltage falls below
an internal threshold and automatically enters sleep mode
when the input power supply is removed.资料下载
