1

DEMO MANUAL DC2134B

Rev. 0

DESCRIPTION

LTC4020EUHF

High Power Buck-Boost

Multi-Chemistry Battery Charger

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 out-

put (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.

All registered trademarks and trademarks are the property of their respective owners.

The LTC4020 battery charger can provide a constant-

current/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.

Design files for this circuit board are available.

PERFORMANCE SUMMARY Specifications are at T

A = 25°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

15

55

V

Battery Float Voltage (BAT) (Nominal)

IBAT = 0A to 6.3A

25.2

V

Converter Output Voltage (VOUT)

IOUT = 0A to 8A

21

28

V

Maximum Battery Charge Current, IBAT

IOUT = 0A

6.3

A

Maximum Converter Output Current, IOUT

IBAT = 0A

8

A

Typical Efficiency

VIN = 24V, VOUT = 25.2V, IOUT = 8A

98

%

Typical Converter Output Ripple

VIN = 55V, VOUT = 27.7V, IOUT = 8A (20MHz BW)

127

mVP-P