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LTC4411

4411fa

Measured Thermal Resistance (2-Layer Board*)

COPPER AREA

BOARD

THERMAL RESISTANCE

TOPSIDE

BACKSIDE

AREA

JUNCTION-TO-AMBIENT

2500mm2

125°C/W

1000mm2

2500mm2

125°C/W

225mm2

2500mm2

130°C/W

100mm2

2500mm2

135°C/W

50mm2

2500mm2

150°C/W

*Each layer uses one ounce copper

LOAD CURRENT (A)

0.5

1.5

2.5

1.0

2.0

3.0

4411 G01

LOAD CURRENT (A)

0.5

1.5

2.5

1.0

2.0

3.0

TA = –40°C

TA = 0°C

TA = 40°C

TA = 80°C

TA = 120°C

4411 G02

0.5

1.0

1.5

2.0

4411 G03

1000

0.5

0.4

0.3

0.2

0.1

0.15

0.10

0.30

0.25

0.20

0.05

100

TA = –40°C

TA = 0°C

TA = 40°C

TA = 80°C

TA = 120°C

TA = –40°C

TA = 0°C

TA = 40°C

TA = 80°C

TA = 120°C

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 6)

TYPICAL PERFOR A CE CHARACTERISTICS

Typical IQF vs ILOAD at VIN = 3.6V

VFWD vs ILOAD at VIN = 3.6V

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC4411E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the –40°C to 85°C ambient

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 150°C/W)

The following table lists thermal resistance for several different board sizes

and copper areas. All measurements were taken in still air on 3/32" FR-4

board with the device mounted on topside.

Note 4: Quiescent current increases with load current, refer to plot of IQF

vs ILOAD.

Note 5: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 6: Current into a pin is positive and current out of a pin is negative.

All voltages are referenced to GND.

RFWD and RON vs ILOAD at

VIN = 3.6V

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