Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

V

IN

12V

SW Voltage

18V

FB Voltage

7V

V

0.965V

≤ V

SHDN Voltage (Note 1)

7V

FSLCT (Note 1)

12V

Maximum Junction Temperature

150˚C

Power Dissipation(Note 3)

Internally Limited

Lead Temperature

300˚C

Vapor Phase (60 sec.)

215˚C

Infrared (15 sec.)

220˚C

ESD Susceptibility (Note 4)

Human Body Model

2kV

Machine Model

200V

Operating Conditions

Operating Junction

Temperature Range

(Note 5)

−40˚C to +125˚C

Storage Temperature

−65˚C to +150˚C

Supply Voltage

2.2V to 12V

SW Voltage

17.5V

Electrical Characteristics

Specifications in standard type face are for T

ture Range (T

Symbol

Parameter

Conditions

Min

(Note 5)

Typ

(Note 6)

Max

(Note 5)

Units

I

Q

Quiescent Current

FB = 2.2V (Not Switching)

FSLCT = 0V

1.2

2

mA

FB = 2.2V (Not Switching)

FSLCT = V

IN

1.3

2

mA

V

5

20

µA

V

FB

Feedback Voltage

1.2285

1.26

1.2915

V

I

CL(Note 7)

Switch Current Limit

V

2.55

3.6

4.3

A

%V

Feedback Voltage Line

Regulation

2.2V

≤ V

0.02

0.07

%/V

I

B

FB Pin Bias Current

(Note 9)

0.5

40

nA

V

IN

Input Voltage Range

2.2

12

V

g

m

Error Amp Transconductance

∆I = 5µA

40

155

290

µmho

A

V

Error Amp Voltage Gain

135

V/V

D

MAX

Maximum Duty Cycle

FSLCT = Ground

78

85

%

D

MIN

Minimum Duty Cycle

FSLCT = Ground

15

%

FSLCT = V

IN

30

f

S

Switching Frequency

FSLCT = Ground

480

600

720

kHz

FSLCT = V

IN

1

1.25

1.5

MHz

I

SHDN

Shutdown Pin Current

V

0.008

1

µA

V

−0.5

−1

I

L

Switch Leakage Current

V

0.02

20

µA

R

DSON

Switch R

DSON (Note 10)

V

80

150

m

Ω

Th

SHDN

SHDN Threshold

Output High

0.9

0.6

V

Output Low

0.6

0.3

V

UVP

On Threshold

1.95

2.05

2.2

V

Off Threshold

1.85

1.95

2.1

V

θ

JA

Thermal Resistance

(Note 11)

TSSOP, package only

150

˚C/W

LLP, package only

45

Note 2: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to

be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.

www.national.com

4