參數(shù)資料
型號(hào)： LTC4085EDE-3#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PDSO14
封裝： 4 X 3 MM, PLASTIC, MO-229, DFN-14
文件頁(yè)數(shù)： 3/24頁(yè)
文件大?。?/td> 275K
代理商： LTC4085EDE-3#TRPBF
LTC4085-3
11
40853f
The LTC4085-3 is a complete PowerPath controller for
battery powered USB applications. The LTC4085-3 is de-
signed to receive power from a USB source, a wall adapter,
or a battery. It can then deliver power to an application
connected to the OUT pin and a battery connected to the
BAT pin (assuming that an external supply other than the
battery is present). Power supplies that have limited cur-
rent resources (such as USB VBUS supplies) should be
connected to the IN pin which has a programmable current
limit. Battery charge current will be adjusted to ensure that
the sum of the charge current and load current does not
exceed the programmed input current limit.
An ideal diode function provides power from the battery
when output/load current exceeds the input current limit or
when input power is removed. Powering the load through
the ideal diode instead of connecting the load directly to
the battery allows a fully charged battery to remain fully
charged until external power is removed. Once external
power is removed the output drops until the ideal diode is
forward biased. The forward biased ideal diode will then
provide the output power to the load from the battery.
Furthermore, powering switching regulator loads from the
OUT pin (rather than directly from the battery) results in
shorter battery charge times. This is due to the fact that
switching regulators typically require constant input power.
When this power is drawn from the OUT pin voltage (rather
than the lower BAT pin voltage) the current consumed
by the switching regulator is lower leaving more current
available to charge the battery.
The LTC4085-3 also has the ability to receive power from
a wall adapter. Wall adapter power can be connected to
the output (load side) of the LTC4085-3 through an ex-
ternal device such as a power Schottky or FET, as shown
in Figure 1. The LTC4085-3 has the unique ability to use
the output, which is powered by the wall adapter, as a
path to charge the battery while providing power to the
load. A wall adapter comparator on the LTC4085-3 can
be congured to detect the presence of the wall adapter
and shut off the connection to the USB to prevent reverse
conduction out to the USB bus.
OPERATION
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參數(shù)描述
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