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DEMO MANUAL DC1868A

Rev. 0

DESCRIPTION

LTM8024

40V, Dual 3A Step-Down µModule Regulator

Demonstration circuit 1868A is a dual step-down DC/DC

switching converter featuring the LTM®8024 μModule

regulator. The demo board is designed to deliver dual

5V/3A and 3.3V/3A outputs from a 7V to 40V input. The

Silent Switcher® architecture minimizes EMI while achiev-

ing high efficiency at frequencies up to 3MHz. The modes

of operation (Burst Mode or Discontinuous Mode/SYNC)

are jumper selectable. Burst Mode operation improves

efficiency at light loads.

The LTM8024 is a fixed frequency PWM regulator with

current mode control scheme. The switching frequency

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PERFORMANCE SUMMARY

is set by an appropriate resistor (R11) from the RT pin to

ground. The RUN pins (EN1/EN2 terminals) can be used

to set the LTM8024 in micro power shutdown mode. The

power good output of each channel (PG1 or PG2 terminal)

will be low when that channel’s output voltage is outside

of the ±7.5% regulation window.

The LTM8024 data sheet gives a complete description of

the operation and application information. The data sheet

must be read in conjunction with this demo manual.

Design files for this circuit board are available.

Specifications are at TA = 25°C

PARAMETER

CONDITION

VALUE

Input Voltage Range

7V to 40V

Output Voltage, VOUT1

VIN = 7V to 40V, IOUT1 = 0A to 3A

5V ± 3%

Output Voltage, VOUT2

VIN = 7V to 40V, IOUT2 = 0A to 3A

3.3V ± 3%

Maximum Output Current, IOUT1

VIN = 7V to 40V, VOUT1 = 5V

3A

Maximum Output Current, IOUT2

VIN = 7V to 40V, VOUT2 = 3.3V

3A

Typical Switching Frequency

1MHz

Typical Efficiency, VOUT1 (5V)

VIN = 12V, IOUT1 = 3A

93.2%

Typical Efficiency, VOUT2 (3.3V)

VIN = 12V, IOUT2 = 3A

91.3%

BOARD PHOTO