LM2597 datasheet(3/34 Pages) NSC

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LM2597/LM2597HV-12

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-12

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 12

OUT

Output Voltage

15V

≤ V

IN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A

11.52/11.40

V(min)

12.48/12.60

V(max)

Efficiency

IN = 25V, ILOAD = 0.5A

LM2597/LM2597HV-ADJ

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-ADJ

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 12

Feedback Voltage

4.5V

≤ V

IN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A

1.230

OUT programmed for 3V. Circuit of Figure 12.

1.193/1.180

V(min)

1.267/1.280

V(max)

Efficiency

IN = 12V, VOUT = 3V, ILOAD = 0.5A

All Output Voltage Versions

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. Unless otherwise specified, V

IN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V ver-

sion. I

LOAD = 100 mA.

Symbol

Parameter

Conditions

LM2597/LM2597HV-XX

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

DEVICE PARAMETERS

Feedback Bias Current

Adjustable Version Only, V

FB = 1.235V

50/100

Oscillator Frequency

(Note 7)

150

kHz

127/110

kHz(min)

173/173

kHz(max)

SAT

Saturation Voltage

OUT = 0.5A (Notes 8 and 9)

0.9

1.1/1.2

V(max)

Max Duty Cycle (ON)

(Note 9)

100

Min Duty Cycle (OFF)

(Note 10)

Current Limit

Peak Current, (Notes 8 and 9)

0.8

0.65/0.58

A(min)

1.3/1.4

A(max)

Output Leakage Current

(Notes 8, 10 and 11)

Output = 0V

µA(max)

Output = −1V

mA(max)

Operating Quiescent

SD /SS Pin Open, V

BS Pin Open(Note 10)

5mA

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