Page 18 - Issue 4 2023

ELECTRONICS
Figure 1: An LTC4416 typical application circuit.
Switching battery charger – LTC4162-L
For the battery charger, the LTC4162-L was selected due
to its wide input voltage range (up to 35 V) and 3.2 A
charging capability, as well as the integrated FET design,
which results in a small solution size. This is a commonly
used, full-featured charger IC, which has great application
Figure 2: An LTC4162-L typical application circuit.
Figure 3: A CN0509 application circuit.
18 | EngineerIT Issue 4 | 2023
flexibility as it comes in many battery chemistry variants
such as LiFePO4, Li-Ion, lead acid, etc., as well as an I2C
interface to allow the user to extract telemetry information.
It was selected for this particular application not only
because of the aforementioned flexibility on the input and
battery voltage but also because of the integrated nature,
which helps to keep the solution size to minimum. Another
useful feature that it has is maximum power point tracking
(MPPT) – if solar is one of the possible input sources for
your design, MPPT is a must to ensure the design extracts
as much available power as possible. The LTC4162 also has a
built-in power path control that is useful in this application
when the input source is removed, allowing the provision
of the battery voltage to the output terminals for use
downstream.
USB Charging Solution – CN0509
The board selected to provide the USB charging voltage
for the connected device is from our Circuits from the
Lab® collection of reference designs and solutions.
Typically, a single device is shown on an evaluation board
to allow evaluation of that specific device. Circuits from
the Lab boards, however, are a more solution-focused
implementation that makes use of several Analog Devices’
products from different product portfolios to solve a
particular system requirement.
The CN0509 was designed to be a wide input range,
dual USB power charger. It was developed for use in
emergencies such as natural disasters or extended power
outages. An example power source that many would
have available to them is a car battery. This board can be
powered by a car battery to provide two 5 V ports, which
are isolated from the primary voltage for safety. There is
a range of alternative power sources that you may have
available, from stacks of loose batteries to motors to
act as a simple generator. The CN0509 has a wide input
voltage range so it will be able to run from any supply
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