LM2596T-3.3 datasheet(5/33 Pages) TI1

部件名	LM2596T-3.3

功能描述	SIMPLE SWITCHER Power Converter

Download	33 Pages

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制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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5 / 33 page

LM2596-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

Symbol

Parameter

Conditions

LM2596-ADJ

Units

(Limits)

Typ

(Note 3)

Limit

(Note 4)

SYSTEM PARAMETERS (Note 5) Test Circuit

Figure 1

V

FB

Feedback Voltage

4.5V

≤ V

IN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A

1.230

V

OUT programmed for 3V. Circuit of Figure 1

1.193/1.180

V(min)

1.267/1.280

V(max)

η

Efficiency

V

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

73

%

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

LM2596-XX

Units

(Limits)

Typ

(Note 3)

Limit

(Note 4)

DEVICE PARAMETERS

I

b

Feedback Bias Current

Adjustable Version Only, V

FB = 1.3V

10

nA

50/100

nA (max)

f

O

Oscillator Frequency

(Note 6)

150

kHz

127/110

kHz(min)

173/173

kHz(max)

V

SAT

Saturation Voltage

I

OUT = 3A (Notes 7, 8)

1.16

V

1.4/1.5

V(max)

DC

Max Duty Cycle (ON)

(Note 8)

100

%

Min Duty Cycle (OFF)

(Note 9)

0

I

CL

Current Limit

Peak Current (Notes 7, 8)

4.5

A

3.6/3.4

A(min)

6.9/7.5

A(max)

I

L

Output Leakage Current

Output = 0V (Notes 7, 9)

50

µA(max)

Output = −1V (Note 10)

2

mA

30

mA(max)

I

Q

Quiescent Current

(Note 9)

5

mA

10

mA(max)

I

STBY

Standby Quiescent Current

ON/OFF pin = 5V (OFF)

(Note 10)

80

µA

200/250

µA(max)

θ

JC

Thermal Resistance

TO-220 or TO-263 Package, Junction to Case

2

˚C/W

θ

JA

TO-220 Package, Junction to Ambient (Note 11)

50

˚C/W

θ

JA

TO-263 Package, Junction to Ambient (Note 12)

50

˚C/W

θ

JA

TO-263 Package, Junction to Ambient (Note 13)

30

˚C/W

θ

JA

TO-263 Package, Junction to Ambient (Note 14)

20

˚C/W

ON/OFF CONTROL Test Circuit

Figure 1

ON /OFF Pin Logic Input

1.3

V

IH

Threshold Voltage

Low (Regulator ON)

0.6

V(max)

V

IL

High (Regulator OFF)

2.0

V(min)

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