LP3910SQ-AN Datasheet, PDF (36/60 Pages) National Semiconductor (TI) – Power Management IC for Hard Drive Based Portable Media Players

LI-ION LINEAR CHARGER
Charger Architecture
The LP3910SQ-AN can safely charge and maintain a single
cell Li-Ion/Polymer battery operating off a regulated 6V Car
adapter, AC wall adapter, or USB power (VBUS). Input power
source selection of USB/adapter is seamless. If present, the
charger will use the adapter power regardless of the presence
of USB power. The connection of either power source is de-
tected by LP3910SQ-AN.
The charger module is a linear charger with constant current
pre-qualification, constant current (“CC”) full-rate charging
and constant voltage (“CV”) charging. CC and CV regulation
is performed using an internal Power FET Q2 with reverse
current blocking. The termination voltage is controlled to with-
in ±0.35% at room temperature.
The power FET Q1 acts as a switch with programmable cur-
rent limit for USB operation.
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