LM2597 datasheet(2/34 Pages) NSC

2 / 34 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Maximum Supply Voltage (V

IN)

LM2597

45V

LM2597HV

60V

SD /SS Pin Input Voltage (Note 2)

Delay Pin Voltage (Note 2)

1.5V

Flag Pin Voltage

−0.3

≤ V ≤45V

Bias Supply Voltage (V

BS)

−0.3

≤ V ≤30V

Feedback Pin Voltage

−0.3

≤ V ≤+25V

Output Voltage to Ground

(Steady State)

−1V

Power Dissipation

Internally limited

Storage Temperature Range

−65˚C to +150˚C

ESD Susceptibility

Human Body Model (Note 3)

2 kV

Lead Temperature

M8 Package

Vapor Phase (60 sec.)

+215˚C

Infrared (15 sec.)

+220˚C

N Package (Soldering, 10 sec.)

+260˚C

Maximum Junction Temperature

+150˚C

Operating Conditions

Temperature Range

−40˚C

≤ T

J +125˚C

Supply Voltage

LM2597

4.5V to 40V

LM2597HV

4.5V to 60V

LM2597/LM2597HV-3.3

Electrical Characteristics

Specifications with standard type face are for T

J = 25˚C, and those with boldface type apply over full Operating Tempera-

ture Range.V

INmax=40V for the LM2597 and 60V for the LM2597HV

Symbol

Parameter

Conditions

LM2597/LM2597HV-3.3

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 12

OUT

Output Voltage

4.75V

≤ V

IN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A

3.3

3.168/3.135

V(min)

3.432/3.465

V(max)

Efficiency

IN = 12V, ILOAD = 0.5A

LM2597/LM2597HV-5.0

Electrical Characteristics

Specifications with standard type face are for T

J = 25˚C, and those with boldface type apply over full Operating Tempera-

ture Range.V

INmax=40V for the LM2597 and 60V for the LM2597HV

Symbol

Parameter

Conditions

LM2597/LM2597HV-5.0

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 12

OUT

Output Voltage

≤ V

IN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A

4.800/4.750

V(min)

5.200/5.250

V(max)

Efficiency

IN = 12V, ILOAD = 0.5A

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