LM2599 datasheet(3/31 Pages) NSC

3 / 31 page

LM2599-12

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.

Symbol

Parameter

Conditions

LM2599-12

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 1

OUT

Output Voltage

15V

≤ V

IN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A

11.52/11.40

V(min)

12.48/12.60

V(max)

Efficiency

IN = 25V, ILOAD = 3A

LM2599-ADJ

Electrical Characteristics

Specifications with standard type face are for T

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

Range.

Symbol

Parameter

Conditions

LM2599-ADJ

Units

(Limits)

Typ

Limit

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit

Figure 1

Feedback Voltage

4.5V

≤ V

IN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A

1.230

OUT programmed for 3V. Circuit of Figure 1.

1.193/1.180

V(min)

1.267/1.280

V(max)

Efficiency

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

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 = 500 mA

Symbol

Parameter

Conditions

LM2599-XX

Units

(Limits)

Typ

Limit

(Note

(Note 5)

DEVICE PARAMETERS

Feedback Bias Current

Adjustable Version Only, V

FB = 1.3V

50/100

nA (max)

Oscillator Frequency

(Note 7)

150

kHz

127/110

kHz(min)

173/173

kHz(max)

SAT

Saturation Voltage

OUT = 3A (Note 8) (Note 9)

1.16

1.4/1.5

V(max)

Max Duty Cycle (ON)

(Note 9)

100

Min Duty Cycle (OFF)

(Note 10)

Current Limit

Peak Current, (Note 8) (Note 9)

4.5

3.6/3.4

A(min)

6.9/7.5

A(max)

Output Leakage Current

(Note 8) (Note 10) (Note 11)

Output = 0V

µA(max)

Output = −1V

mA(max)

Operating Quiescent

SD /SS Pin Open (Note 10)

5mA

Current

mA(max)

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