LTM8049 datasheet(8/20 Pages) LINER

8 / 20 page

LTM8067

8067fc

For more information www.linear.com/LTM8067

PIN FUNCTIONS

VOUT (Bank 1): VOUT and VOUTN comprise the isolated

output of the LTM8067 flyback stage. Apply an external

capacitor between VOUT and VOUTN. Do not allow VOUTN

to exceed VOUT.

VOUTN (Bank 2): VOUTN is the return for VOUT. VOUT and

VOUTN comprise the isolated output of the LTM8067. In

most applications, the bulk of the heat flow out of the

LTM8067 is through the GND and VOUTN pads, so the

printed circuit design has a large impact on the thermal

performance of the part. See the PCB Layout and Thermal

Considerationssectionsformoredetails.Applyanexternal

capacitor between VOUT and VOUTN.

GND (Bank 4): This is the primary side local ground of the

LTM8067primary.Inmostapplications,thebulkoftheheat

flow out of the LTM8067 is through the GND and VOUTN

pads, so the printed circuit design has a large impact on

the thermal performance of the part. See the PCB Layout

and Thermal Considerations sections for more details.

VIN (Bank 5): VIN supplies current to the LTM8067’s

internal regulator and to the integrated power switch.

These pins must be locally bypassed with an external,

low ESR capacitor.

RUN (Pin F3): A resistive divider connected to VIN and this

pin programs the minimum voltage at which the LTM8067

will operate. Below 1.214V, the LTM8067 does not deliver

powertothesecondary.WhenRUNislessthan1.214V,the

pin draws 2.5µA, allowing for a programmable hysteresis.

Do not allow a negative voltage (relative to GND) on this

pin. Tie this pin to VIN if it is not used.

FB (Pins G7): Apply a resistor from this pin to GND to

set the output voltage VOUTN relative to VOUTN, using the

recommended value given in Table 1. If Table 1 does not

list the desired VOUT value, the equation:

RFB =37.415 VOUT–0.955

(

)kΩ

may be used to approximate the value. To the seasoned

designer,thisexponentialequationmayseemunusual.The

equation is exponential due to nonlinear current sources

that are used to temperature compensate the regulation.

Do not drive this pin with an external power source.

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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