The ETA6937 is a new generation of highly integrated synchronous
switch-mode charger, featuring integrated FETs and small external
components, targeted at extremely space-limited portable
applications powered by 1-cell Li-Ion or Li-polymer battery pack.
Unlike previous generation of charging ICs (BQ2415X and FAN54015
etc.) that can barely deliver charge current up to 1.5A, thanks to
ETA’s proprietary technology, ETA6937 packs a powerful punch and
can delivery up to 3A of charge current, while still maintaining a
small footprint of 2mmx1.6mm. ETA6937 has bi-directional operation
to achieve boost function for USB OTG support. The ETA6937 have
three operation modes: charge mode, boost mode, and high
impedance mode. In charge mode, the IC supports a precision Li-ion
or Li-polymer charging system for single-cell applications. In boost
mode, the IC boosts the battery voltage to VBUS for powering
attached OTG devices. In high impedance mode, the IC stops charging
or boosting and operates in a mode with very low current from VBUS
or battery, to effectively reduce the power consumption when the
portable device is in standby mode. Through I2C communication with
a host, referred to as "HOST" control/mode, the IC achieves smooth
transition among the different operation modes. Even when no I2C
communication is available, the IC starts in default mode. During
default mode operation, the charger will still charge the battery but
using each register's default values.
