DESCRIPTION
Demonstration circuit 2134B is a high power buck-boost
multi-chemistry battery charger featuring the LTC®4020.
The board will accept an input voltage between 15V and
55V. The float voltage of the battery output (BAT) is 25.2V,
with 6.3A maximum charge current. The converter output
(VOUT) has a voltage range of 21V to 28V, with 8A
maximum load current. The LTC4020 contains a high
efficiency synchronous buck-boost DC/DC controller and
uses a proprietary average current mode architecture.
The LTC4020 battery charger can provide a constantcurrent/
constant-voltage charge algorithm (CC/CV); a
four-step, three-stage lead-acid battery-charge profile or
constant-current charging (CC). Battery-chemistry type
is selected using onboard jumper JP1.
The LTC4020 data sheet gives a complete description of
the IC operation and application information. The data sheet
must be read in conjunction with this quick start guide.