LTC4366 datasheet(18/22 Pages) AD

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LTC4249

Rev. 0

For more information www.analog.com

TO LOAD

RIMON11

10F

CLOAD

GND

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

IMON2

RDY2

IN2

EN2

OUT2

INTVCC

0.1F

SOME CONNECTIONS

OMITTED FOR CLARITY

ENABLE_1

RIMON12

RIMON21

GND

IN1

OUT1

EN1

RDY1

LTC4249

IMON1

IMON2

RDY2

IN2

EN2

OUT2

INTVCC

0.1F

ENABLE_2

RIMON22

4249 F20

Figure 20. Load Switch Application

High Voltage Spacing Considerations

In applications where creepage and clearance standards

up to 65V must be met, a 12-Lead 3mm × 4mm LQFN

package is available for ordering. The IN1, OUT1, IN2 and

OUT2 leads are all adequately spaced to all other leads

including the exposed thermal pad.

Thermal Considerations

The exposed thermal pad is internally connected to

ground and provides an optimal path for heat removal.

In applications where the ambient temperature is above

90°C, connect the exposed pad to 2 inch2 of 1oz PCB cop-

per to limit junction heating when operating at maximum

current capability of 1.2A per channel (2.4A total).

At high ambient temperatures, a heat removal path is

also important during the 10ms current limited operat-

ing phase, where the pulsed power can cause brief but

large temperature rise.

Under extreme thermal conditions an integrated thermal

switch activates to turn off both channels. The breakers

remain off for typically 1 second and until the respective

enable inputs are toggled.

Industrial Applications

Many of the individual applications discussed thus far can

be combined in clever ways to solve system problems.

Industrial applications often require the need for circuit

breakers. The back page shows an industrial application

utilizing the LTC4249 capabilities to provide undervolt-

age (UV), overvoltage (OV), overcurrent (OC) and reverse

current protection for a 15V system with a nominal 50mA

resistive load current. The resistor values are calculated

to provide the following thresholds:

UV Threshold: 12V

OV Threshold: 16.9V

Forward OC Primary Threshold: 193mA

Reverse OC Primary Threshold: 1.2A

APPLICATIONS INFORMATION

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