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LTM8068

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For more information www.linear.com/LTM8068

OPERATION

The LTM8068 is a stand-alone isolated flyback switching

DC/DC power supply that can deliver up to 450mA of

output current at 5VOUT1, 24VIN. This module provides a

regulated output voltage programmable via one external

resistor from 2.5V to 18V. It is also equipped with a high

performance linear post regulator. The input voltage range

of the LTM8068 is 2.8V to 40V. Given that the LTM8068

is a flyback converter, the output current depends upon

the input and output voltages, so make sure that the

input voltage is high enough to support the desired out-

put voltage and load current. The Typical Performance

Characteristics section gives several graphs of the maxi-

mum load versus VIN for several output voltages.

A simplified block diagram is given. The LTM8068 con-

tains a current mode controller, power switching ele-

ment, power transformer, power Schottky diode, a mod-

est amount of input and output capacitance, and a high

performance linear post regulator.

The LTM8068 has a galvanic primary to secondary iso-

lation rating of 2kVAC. For details please refer to the

Isolation, Working Voltage and Safely Compliance sec-

tion. The LTM8068 is a UL 60950 recognized component.

The RUN pin is used to turn on or off the LTM8068, dis-

connecting the output and reducing the input current to

1μA or less.

The LTM8068 is a variable frequency device. For a given

input and output voltage, the frequency decreases as the

load increases. For light loads, the current through the

internal transformer may be discontinuous.

The post regulator is a high performance 300mA low

dropout regulator with micropower quiescent current and

shutdown. The device is capable of supplying 300mA at

a dropout voltage of 430mV. Output voltage noise can be

lowered to 20µVRMS over a 100Hz to 100kHz bandwidth

with the addition of a 0.01μF reference bypass capacitor.

Additionally, this reference bypass capacitor will improve

transient response of the regulator, lowering the settling

time for transient load conditions. The linear regulator is

protected against both reverse input and reverse output

voltages.

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