Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Input Supply Voltage

45V

ON/OFF Pin Voltage

−0.1V to 6V

Switch Voltage to Ground

−1V to V

IN

Boost Pin Voltage

V

Feedback Pin Voltage

−0.3V to 14V

Power Dissipation

Internally Limited

ESD (Note 2)

2 kV

Storage Temperature Range

−65˚C to 150˚C

Soldering Temperature

Wave

4 sec, 260˚C

Infrared

10 sec, 240˚C

Vapor Phase

75 sec, 219˚C

Operating Ratings

Supply Voltage

8V to 40V

Junction Temperature Range (T

−40˚C to 125˚C

range of operation, −40˚C to 125˚C. Specifications appearing in normal type apply for T

LM2678-3.3

Symbol

Parameter

Conditions

Typical

Min

Max

Units

(Note 3)

(Note 4)

(Note 4)

V

OUT

Output Voltage

V

≤ I

OUT

≤ 5A

3.3

3.234/3.201

3.366/3.399

V

η

Efficiency

V

82

%

LM2678-5.0

Symbol

Parameter

Conditions

Typical

Min

Max

Units

(Note 3)

(Note 4)

(Note 4)

V

OUT

Output Voltage

V

≤ I

OUT

≤ 5A

5.0

4.900/4.850

5.100/5.150

V

η

Efficiency

V

84

%

LM2678-12

Symbol

Parameter

Conditions

Typical

Min

Max

Units

(Note 3)

(Note 4)

(Note 4)

V

OUT

Output Voltage

V

≤ I

OUT

≤ 5A

12

11.76/11.64

12.24/12.36

V

η

Efficiency

V

92

%

LM2678-ADJ

Symbol

Parameter

Conditions

Typ

Min

Max

Units

(Note 3)

(Note 4)

(Note 4)

V

FB

Feedback

Voltage

V

≤ I

OUT

≤ 5A

V

1.21

1.186/1.174

1.234/1.246

V

η

Efficiency

V

84

%

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